fix: add new vscode debugger functions

feat: allow adding custom wrappers

.gitattributes

@@ -0,0 +1 @@
+* -text

.github/workflows/tagged-release.yml

@@ -3,7 +3,7 @@ name: "tagged-release"
 on:
   push:
     tags:
-      - "v*"
+      - "*"
 
 jobs:
   tagged-release:
@@ -11,15 +11,22 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'adopt'
+          java-version: '11'
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
       - name: Clone repository
         uses: GuillaumeFalourd/clone-github-repo-action@main
         with:
-          branch: 'master' # fuck this political bullshitshit, took me an hour to fix this
+          branch: 'master'
           owner: 'TopchetoEU'
           repository: 'java-jscript'
-      - name: "Build"
+      - name: Build
         run: |
-          cd java-jscript; node ./build.js release ${{ github.ref }}
+          cd java-jscript; gradle build
 
       - uses: "marvinpinto/action-automatic-releases@latest"
         with:
@@ -27,4 +34,4 @@ jobs:
           prerelease: false
           files: |
             java-jscript/LICENSE
-            java-jscript/dst/*.jar
+            java-jscript/build/libs/*.jar

.gitignore

@@ -1,11 +1,24 @@
-.vscode
-.gradle
-.ignore
-/out
-/build
-/bin
-/dst
-/*.js
-!/build.js
-/dead-code
-/Metadata.java
+*
+
+!/src
+!/src/**/*
+
+!/doc
+!/doc/**/*
+
+!/tests
+!/tests/**/*
+
+!/.github
+!/.github/**/*
+
+!/.gitignore
+!/.gitattributes
+!/LICENSE
+!/README.md
+!/settings.gradle
+!/build.gradle
+!/gradle.properties
+!/gradle
+!/gradle/wrapper
+!/gradle/wrapper/gradle-wrapper.properties

README.md

@@ -2,33 +2,24 @@
 
 **NOTE: This had nothing to do with Microsoft's dialect of EcmaScript**
 
-**WARNING: Currently, this code is mostly undocumented. Proceed with caution and a psychiatrist.**
+**WARNING: Currently, this code is undocumented. Proceed with caution and a psychiatrist.**
 
-JScript is an engine, capable of running EcmaScript 5, written entirely in Java. This engine has been developed with the goal of being easy to integrate with your preexisting codebase, **THE GOAL OF THIS ENGINE IS NOT PERFORMANCE**. My crude experiments show that this engine is 50x-100x slower than V8, which, although bad, is acceptable for most simple scripting purposes.
+JScript is an engine, capable of running EcmaScript 5, written entirely in Java. This engine has been developed with the goal of being easy to integrate with your preexisting codebase, **THE GOAL OF THIS ENGINE IS NOT PERFORMANCE**. My crude experiments show that this engine is 50x-100x slower than V8, which, although bad, is acceptable for most simple scripting purposes. Note that although the codebase has a Main class, this isn't meant to be a standalone program, but instead a library for running JavaScript code.
 
 ## Example
 
-The following will create a REPL using the engine as a backend. Not that this won't properly log errors. I recommend checking out the implementation in `Main.main`:
+The following is going to execute a simple javascript statement:
 
 ```java
-var engine = new PolyfillEngine(new File("."));
-var in = new BufferedReader(new InputStreamReader(System.in));
-engine.start();
+var engine = new Engine();
+// Initialize a standard environment, with implementations of most basic standard libraries (Object, Array, Symbol, etc.)
+var env = Internals.apply(new Environment());
 
-while (true) {
-    try {
-        var raw = in.readLine();
+// Queue code to load internal libraries and start engine
+var awaitable = engine.pushMsg(false, env, new Filename("tmp", "eval"), "10 + Math.sqrt(5 / 3)", null);
+// Run the engine on the same thread, until the event loop runs empty
+engine.run(true);
 
-        var res = engine.pushMsg(false, engine.global(), Map.of(), "<stdio>", raw, null).await();
-        Values.printValue(engine.context(), res);
-        System.out.println();
-    }
-    catch (EngineException e) {
-        try {
-            System.out.println("Uncaught " + e.toString(engine.context()));
-        }
-        catch (InterruptedException _e) {  return; }
-    }
-    catch (IOException | InterruptedException e) { return; }
-}
+// Get our result
+System.out.println(awaitable.await());
 ```

build.gradle

@@ -0,0 +1,32 @@
+plugins {
+    id "application"
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+    toolchain.languageVersion = JavaLanguageVersion.of(11)
+    withSourcesJar()
+}
+
+jar {
+    manifest.attributes["Main-class"] = project.main_class
+}
+
+sourceSets {
+    main.java.srcDirs = [ "src/java" ]
+    main.resources.srcDirs = [ "src/assets" ]
+}
+
+processResources {
+    filesMatching "metadata.json", {
+        expand(
+            version: project.project_version,
+            name: project.project_name
+        )
+    }
+}
+
+base.archivesName = project.project_name
+version = project.project_version
+group = project.project_group

build.js

@@ -1,79 +0,0 @@
-const { spawn } = require('child_process');
-const fs = require('fs/promises');
-const pt = require('path');
-const { argv } = require('process');
-
-const conf = {
-    name: "java-jscript",
-    author: "TopchetoEU",
-    javahome: "",
-    version: argv[3]
-};
-
-if (conf.version.startsWith('refs/tags/')) conf.version = conf.version.substring(10);
-if (conf.version.startsWith('v')) conf.version = conf.version.substring(1);
-
-async function* find(src, dst, wildcard) {
-    const stat = await fs.stat(src);
-
-    if (stat.isDirectory()) {
-        for (const el of await fs.readdir(src)) {
-            for await (const res of find(pt.join(src, el), dst ? pt.join(dst, el) : undefined, wildcard)) yield res;
-        }
-    }
-    else if (stat.isFile() && wildcard(src)) yield dst ? { src, dst } : src;
-}
-async function copy(src, dst, wildcard) {
-    const promises = [];
-
-    for await (const el of find(src, dst, wildcard)) {
-        promises.push((async () => {
-            await fs.mkdir(pt.dirname(el.dst), { recursive: true });
-            await fs.copyFile(el.src, el.dst);
-        })());
-    }
-
-    await Promise.all(promises);
-}
-
-function run(cmd, ...args) {
-    return new Promise((res, rej) => {
-        const proc = spawn(cmd, args, { stdio: 'inherit' });
-        proc.once('exit', code => {
-            if (code === 0) res(code);
-            else rej(new Error(`Process ${cmd} exited with code ${code}.`));
-        });
-    })
-}
-
-async function compileJava() {
-    try {
-        await fs.writeFile('Metadata.java', (await fs.readFile('src/me/topchetoeu/jscript/Metadata.java')).toString()
-            .replace('${VERSION}', conf.version)
-            .replace('${NAME}', conf.name)
-            .replace('${AUTHOR}', conf.author)
-        );
-        const args = ['--release', '11', ];
-        if (argv[2] === 'debug') args.push('-g');
-        args.push('-d', 'dst/classes', 'Metadata.java');
-    
-        for await (const path of find('src', undefined, v => v.endsWith('.java') && !v.endsWith('Metadata.java'))) args.push(path);
-        await run(conf.javahome + 'javac', ...args);
-    }
-    finally {
-        await fs.rm('Metadata.java');
-    }
-}
-
-(async () => {
-    try {
-        try { await fs.rm('dst', { recursive: true }); } catch {}
-        await copy('src', 'dst/classes', v => !v.endsWith('.java'));
-        await compileJava();
-        await run('jar', '-c', '-f', 'dst/jscript.jar', '-e', 'me.topchetoeu.jscript.Main', '-C', 'dst/classes', '.');
-    }
-    catch (e) {
-        if (argv[2] === 'debug') throw e;
-        else console.log(e.toString());
-    }
-})();

gradle.properties

@@ -0,0 +1,4 @@
+project_group = me.topchetoeu
+project_name = jscript
+project_version = 0.9.12-beta
+main_class = me.topchetoeu.jscript.utils.JScriptRepl

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

settings.gradle

@@ -0,0 +1,5 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.7.0'
+}
+
+rootProject.name = properties.project_name

src/assets/debugger/index.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>JScript Debugger</title>
+</head>
+<body>
+    <p>
+        This is the debugger of JScript. It implement the <a href="https://chromedevtools.github.io/devtools-protocol/1-2/">V8 Debugging protocol</a>,
+        so you can use the devtools in chrome. <br>
+        The debugger is still in early development, so please report any issues to
+        <a href="https://github.com/TopchetoEU/java-jscript/issues">the github repo</a>.
+    </p>
+
+    <p>
+        Here are the available entrypoints:
+        <ul>
+            <li><a href="json/version">/json/version</a> - version and other stuff about the JScript engine</li>
+            <li><a href="json/list">/json/list</a> - a list of all entrypoints</li>
+            <li><a href="json/protocol">/json/protocol</a> - documentation of the implemented V8 protocol</li>
+            <li>/(any target) - websocket entrypoints for debugging</li>
+        </ul>
+    </p>
+
+    <p>
+        Running ${NAME} v${VERSION} by ${AUTHOR}
+    </p>
+</body>
+</html>

src/assets/metadata.json

@@ -0,0 +1,5 @@
+{
+    "version": "${version}",
+    "name": "${name}",
+    "author": "TopchetoEU"
+}

src/java/me/topchetoeu/jscript/common/Buffer.java

@@ -0,0 +1,58 @@
+package me.topchetoeu.jscript.common;
+
+public class Buffer {
+    private byte[] data;
+    private int length;
+
+    public void write(int i, byte[] val) {
+        if (i + val.length > data.length) {
+            var newCap = i + val.length + 1;
+            if (newCap < data.length * 2) newCap = data.length * 2;
+
+            var tmp = new byte[newCap];
+            System.arraycopy(this.data, 0, tmp, 0, length);
+            this.data = tmp;
+        }
+
+        System.arraycopy(val, 0, data, i, val.length);
+        if (i + val.length > length) length = i + val.length;
+    }
+    public int read(int i, byte[] buff) {
+        int n = buff.length;
+        if (i + n > length) n = length - i;
+        System.arraycopy(data, i, buff, 0, n);
+        return n;
+    }
+
+    public void clear() {
+        data = new byte[128];
+        length = 0;
+    }
+
+    public void append(byte b) {
+        write(length, new byte[] { b });
+    }
+
+    public byte[] data() {
+        var res = new byte[length];
+        System.arraycopy(this.data, 0, res, 0, length);
+        return res;
+    }
+    public int length() {
+        return length;
+    }
+
+    public Buffer(byte[] data) {
+        this.data = new byte[data.length];
+        this.length = data.length;
+        System.arraycopy(data, 0, this.data, 0, data.length);
+    }
+    public Buffer(int capacity) {
+        this.data = new byte[capacity];
+        this.length = 0;
+    }
+    public Buffer() {
+        this.data = new byte[128];
+        this.length = 0;
+    }
+}

src/java/me/topchetoeu/jscript/common/Filename.java

@@ -0,0 +1,57 @@
+package me.topchetoeu.jscript.common;
+
+import java.io.File;
+import java.nio.file.Path;
+
+public class Filename {
+    public final String protocol;
+    public final String path;
+
+    @Override public String toString() {
+        return protocol + "://" + path;
+    }
+    @Override public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + protocol.hashCode();
+        result = prime * result + path.hashCode();
+        return result;
+    }
+    @Override public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null) return false;
+        if (getClass() != obj.getClass()) return false;
+
+        var other = (Filename) obj;
+
+        if (protocol == null) {
+            if (other.protocol != null) return false;
+        }
+        else if (!protocol.equals(other.protocol)) return false;
+
+        if (path == null) {
+            if (other.path != null) return false;
+        }
+        else if (!path.equals(other.path)) return false;
+        return true;
+    }
+
+    public Filename(String protocol, String path) {
+        path = path.trim();
+        protocol = protocol.trim();
+        this.protocol = protocol;
+        this.path = path;
+    }
+
+    public static Filename parse(String val) {
+        var i = val.indexOf("://");
+        if (i >= 0) return new Filename(val.substring(0, i).trim(), val.substring(i + 3).trim());
+        else return new Filename("file", val.trim());
+    }
+    public static Path normalize(String path) {
+        return Path.of(Path.of("/" + path.trim().replace("\\", "/")).normalize().toString().substring(1));
+    }
+    public static Filename fromFile(File file) {
+        return new Filename("file", file.getAbsolutePath());
+    }
+}

src/java/me/topchetoeu/jscript/common/FunctionBody.java

@@ -0,0 +1,14 @@
+package me.topchetoeu.jscript.common;
+
+public class FunctionBody {
+    public final FunctionBody[] children;
+    public final Instruction[] instructions;
+    public final int localsN, argsN;
+
+    public FunctionBody(int localsN, int argsN, Instruction[] instructions, FunctionBody[] children) {
+        this.children = children;
+        this.argsN = argsN;
+        this.localsN = localsN;
+        this.instructions = instructions;
+    }
+}

src/java/me/topchetoeu/jscript/common/Instruction.java

@@ -0,0 +1,369 @@
+package me.topchetoeu.jscript.common;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+
+public class Instruction {
+    public static enum Type {
+        NOP(0),
+        RETURN(1),
+        THROW(2),
+        THROW_SYNTAX(3),
+        DELETE(4),
+        TRY_START(5),
+        TRY_END(6),
+
+        CALL(7),
+        CALL_NEW(8),
+        JMP_IF(9),
+        JMP_IFN(10),
+        JMP(11),
+
+        PUSH_UNDEFINED(12),
+        PUSH_NULL(13),
+        PUSH_BOOL(14),
+        PUSH_NUMBER(15),
+        PUSH_STRING(16),
+
+        LOAD_VAR(17),
+        LOAD_MEMBER(18),
+        LOAD_GLOB(20),
+
+        LOAD_FUNC(21),
+        LOAD_ARR(22),
+        LOAD_OBJ(23),
+        STORE_SELF_FUNC(24),
+        LOAD_REGEX(25),
+
+        DUP(26),
+
+        STORE_VAR(27),
+        STORE_MEMBER(28),
+        DISCARD(29),
+
+        MAKE_VAR(30),
+        DEF_PROP(31),
+        KEYS(32),
+
+        TYPEOF(33),
+        OPERATION(34);
+
+        private static final HashMap<Integer, Type> types = new HashMap<>();
+        public final int numeric;
+
+        static {
+            for (var val : Type.values()) types.put(val.numeric, val);
+        }
+
+        private Type(int numeric) {
+            this.numeric = numeric;
+        }
+
+        public static Type fromNumeric(int i) {
+            return types.get(i);
+        }
+    }
+    public static enum BreakpointType {
+        NONE,
+        STEP_OVER,
+        STEP_IN;
+
+        public boolean shouldStepIn() {
+            return this != NONE;
+        }
+        public boolean shouldStepOver() {
+            return this == STEP_OVER;
+        }
+    }
+
+    public final Type type;
+    public final Object[] params;
+
+    @SuppressWarnings("unchecked")
+    public <T> T get(int i) {
+        if (i >= params.length || i < 0) return null;
+        return (T)params[i];
+    }
+    @SuppressWarnings("unchecked")
+    public <T> T get(int i, T defaultVal) {
+        if (i >= params.length || i < 0) return defaultVal;
+        return (T)params[i];
+    }
+    public boolean match(Object ...args) {
+        if (args.length != params.length) return false;
+        for (int i = 0; i < args.length; i++) {
+            var a = params[i];
+            var b = args[i];
+            if (a == null || b == null) {
+                if (!(a == null && b == null)) return false;
+            }
+            if (!a.equals(b)) return false;
+        }
+        return true;
+    }
+    public boolean is(int i, Object arg) {
+        if (params.length <= i) return false;
+        return params[i].equals(arg);
+    }
+
+    public void write(DataOutputStream writer) throws IOException {
+        var rawType = type.numeric;
+
+        switch (type) {
+            case KEYS:
+            case PUSH_BOOL:
+            case STORE_MEMBER: rawType |= (boolean)get(0) ? 128 : 0; break;
+            case STORE_VAR: rawType |= (boolean)get(1) ? 128 : 0; break;
+            case TYPEOF: rawType |= params.length > 0 ? 128 : 0; break;
+            default:
+        }
+
+        writer.writeByte(rawType);
+
+        switch (type) {
+            case CALL: writer.writeInt(get(0)); break;
+            case CALL_NEW: writer.writeInt(get(0)); break;
+            case DUP: writer.writeInt(get(0)); break;
+            case JMP: writer.writeInt(get(0)); break;
+            case JMP_IF: writer.writeInt(get(0)); break;
+            case JMP_IFN: writer.writeInt(get(0)); break;
+            case LOAD_ARR: writer.writeInt(get(0)); break;
+            case LOAD_FUNC: {
+                writer.writeInt(params.length - 1);
+
+                for (var i = 0; i < params.length; i++) {
+                    writer.writeInt(get(i + 1));
+                }
+
+                writer.writeInt(get(0));
+                break;
+            }
+            case LOAD_REGEX: writer.writeUTF(get(0)); break;
+            case LOAD_VAR: writer.writeInt(get(0)); break;
+            case MAKE_VAR: writer.writeUTF(get(0)); break;
+            case OPERATION: writer.writeByte(((Operation)get(0)).numeric); break;
+            case PUSH_NUMBER: writer.writeDouble(get(0)); break;
+            case PUSH_STRING: writer.writeUTF(get(0)); break;
+            case STORE_SELF_FUNC: writer.writeInt(get(0)); break;
+            case STORE_VAR: writer.writeInt(get(0)); break;
+            case THROW_SYNTAX: writer.writeUTF(get(0));
+            case TRY_START:
+                writer.writeInt(get(0));
+                writer.writeInt(get(1));
+                writer.writeInt(get(2));
+                break;
+            case TYPEOF:
+                if (params.length > 0) writer.writeUTF(get(0));
+                break;
+            default:
+        }
+    }
+
+    private Instruction(Type type, Object ...params) {
+        this.type = type;
+        this.params = params;
+    }
+
+    public static Instruction read(DataInputStream stream) throws IOException {
+        var rawType = stream.readUnsignedByte();
+        var type = Type.fromNumeric(rawType & 127);
+        var flag = (rawType & 128) != 0;
+
+        switch (type) {
+            case CALL: return call(stream.readInt());
+            case CALL_NEW: return callNew(stream.readInt());
+            case DEF_PROP: return defProp();
+            case DELETE: return delete();
+            case DISCARD: return discard();
+            case DUP: return dup(stream.readInt());
+            case JMP: return jmp(stream.readInt());
+            case JMP_IF: return jmpIf(stream.readInt());
+            case JMP_IFN: return jmpIfNot(stream.readInt());
+            case KEYS: return keys(flag);
+            case LOAD_ARR: return loadArr(stream.readInt());
+            case LOAD_FUNC: {
+                var captures = new int[stream.readInt()];
+
+                for (var i = 0; i < captures.length; i++) {
+                    captures[i] = stream.readInt();
+                }
+
+                return loadFunc(stream.readInt(), captures);
+            }
+            case LOAD_GLOB: return loadGlob();
+            case LOAD_MEMBER: return loadMember();
+            case LOAD_OBJ: return loadObj();
+            case LOAD_REGEX: return loadRegex(stream.readUTF(), null);
+            case LOAD_VAR: return loadVar(stream.readInt());
+            case MAKE_VAR: return makeVar(stream.readUTF());
+            case OPERATION: return operation(Operation.fromNumeric(stream.readUnsignedByte()));
+            case PUSH_NULL: return pushNull();
+            case PUSH_UNDEFINED: return pushUndefined();
+            case PUSH_BOOL: return pushValue(flag);
+            case PUSH_NUMBER: return pushValue(stream.readDouble());
+            case PUSH_STRING: return pushValue(stream.readUTF());
+            case RETURN: return ret();
+            case STORE_MEMBER: return storeMember(flag);
+            case STORE_SELF_FUNC: return storeSelfFunc(stream.readInt());
+            case STORE_VAR: return storeVar(stream.readInt(), flag);
+            case THROW: return throwInstr();
+            case THROW_SYNTAX: return throwSyntax(stream.readUTF());
+            case TRY_END: return tryEnd();
+            case TRY_START: return tryStart(stream.readInt(), stream.readInt(), stream.readInt());
+            case TYPEOF: return flag ? typeof(stream.readUTF()) : typeof();
+            case NOP:
+                if (flag) return null;
+                else return nop();
+            default: return null;
+        }
+    }
+
+    public static Instruction tryStart(int catchStart, int finallyStart, int end) {
+        return new Instruction(Type.TRY_START, catchStart, finallyStart, end);
+    }
+    public static Instruction tryEnd() {
+        return new Instruction(Type.TRY_END);
+    }
+    public static Instruction throwInstr() {
+        return new Instruction(Type.THROW);
+    }
+    public static Instruction throwSyntax(SyntaxException err) {
+        return new Instruction(Type.THROW_SYNTAX, err.getMessage());
+    }
+    public static Instruction throwSyntax(String err) {
+        return new Instruction(Type.THROW_SYNTAX, err);
+    }
+    public static Instruction delete() {
+        return new Instruction(Type.DELETE);
+    }
+    public static Instruction ret() {
+        return new Instruction(Type.RETURN);
+    }
+    public static Instruction debug() {
+        return new Instruction(Type.NOP, "debug");
+    }
+
+    public static Instruction nop(Object ...params) {
+        return new Instruction(Type.NOP, params);
+    }
+
+    public static Instruction call(int argn) {
+        return new Instruction(Type.CALL, argn);
+    }
+    public static Instruction callNew(int argn) {
+        return new Instruction(Type.CALL_NEW, argn);
+    }
+    public static Instruction jmp(int offset) {
+        return new Instruction(Type.JMP, offset);
+    }
+    public static Instruction jmpIf(int offset) {
+        return new Instruction(Type.JMP_IF, offset);
+    }
+    public static Instruction jmpIfNot(int offset) {
+        return new Instruction(Type.JMP_IFN, offset);
+    }
+
+    public static Instruction pushUndefined() {
+        return new Instruction(Type.PUSH_UNDEFINED);
+    }
+    public static Instruction pushNull() {
+        return new Instruction(Type.PUSH_NULL);
+    }
+    public static Instruction pushValue(boolean val) {
+        return new Instruction(Type.PUSH_BOOL, val);
+    }
+    public static Instruction pushValue(double val) {
+        return new Instruction(Type.PUSH_NUMBER, val);
+    }
+    public static Instruction pushValue(String val) {
+        return new Instruction(Type.PUSH_STRING, val);
+    }
+
+    public static Instruction makeVar(String name) {
+        return new Instruction(Type.MAKE_VAR, name);
+    }
+    public static Instruction loadVar(Object i) {
+        return new Instruction(Type.LOAD_VAR, i);
+    }
+    public static Instruction loadGlob() {
+        return new Instruction(Type.LOAD_GLOB);
+    }
+    public static Instruction loadMember() {
+        return new Instruction(Type.LOAD_MEMBER);
+    }
+
+    public static Instruction loadRegex(String pattern, String flags) {
+        return new Instruction(Type.LOAD_REGEX, pattern, flags);
+    }
+    public static Instruction loadFunc(int id, int[] captures) {
+        var args = new Object[1 + captures.length];
+        args[0] = id;
+        for (var i = 0; i < captures.length; i++) args[i + 1] = captures[i];
+        return new Instruction(Type.LOAD_FUNC, args);
+    }
+    public static Instruction loadObj() {
+        return new Instruction(Type.LOAD_OBJ);
+    }
+    public static Instruction loadArr(int count) {
+        return new Instruction(Type.LOAD_ARR, count);
+    }
+    public static Instruction dup() {
+        return new Instruction(Type.DUP, 1);
+    }
+    public static Instruction dup(int count) {
+        return new Instruction(Type.DUP, count);
+    }
+
+    public static Instruction storeSelfFunc(int i) {
+        return new Instruction(Type.STORE_SELF_FUNC, i);
+    }
+    public static Instruction storeVar(Object i) {
+        return new Instruction(Type.STORE_VAR, i, false);
+    }
+    public static Instruction storeVar(Object i, boolean keep) {
+        return new Instruction(Type.STORE_VAR, i, keep);
+    }
+    public static Instruction storeMember() {
+        return new Instruction(Type.STORE_MEMBER, false);
+    }
+    public static Instruction storeMember(boolean keep) {
+        return new Instruction(Type.STORE_MEMBER, keep);
+    }
+    public static Instruction discard() {
+        return new Instruction(Type.DISCARD);
+    }
+
+    public static Instruction typeof() {
+        return new Instruction(Type.TYPEOF);
+    }
+    public static Instruction typeof(String varName) {
+        return new Instruction(Type.TYPEOF, varName);
+    }
+
+    public static Instruction keys(boolean forInFormat) {
+        return new Instruction(Type.KEYS, forInFormat);
+    }
+
+    public static Instruction defProp() {
+        return new Instruction(Type.DEF_PROP);
+    }
+
+    public static Instruction operation(Operation op) {
+        return new Instruction(Type.OPERATION, op);
+    }
+
+    @Override
+    public String toString() {
+        var res = type.toString();
+
+        for (int i = 0; i < params.length; i++) {
+            res += " " + params[i];
+        }
+
+        return res;
+    }
+}

src/java/me/topchetoeu/jscript/common/Location.java

@@ -0,0 +1,101 @@
+package me.topchetoeu.jscript.common;
+
+import java.util.ArrayList;
+
+public class Location implements Comparable<Location> {
+    public static final Location INTERNAL = new Location(-1, -1, new Filename("jscript", "native"));
+    private int line;
+    private int start;
+    private Filename filename;
+
+    public int line() { return line; }
+    public int start() { return start; }
+    public Filename filename() { return filename; }
+
+    @Override
+    public String toString() {
+        var res = new ArrayList<String>();
+
+        if (filename != null) res.add(filename.toString());
+        if (line >= 0) res.add(line + "");
+        if (start >= 0) res.add(start + "");
+
+        return String.join(":", res);
+    }
+
+    public Location add(int n, boolean clone) {
+        if (clone) return new Location(line, start + n, filename);
+        this.start += n;
+        return this;
+    }
+    public Location add(int n) {
+        return add(n, false);
+    }
+    public Location nextLine() {
+        line++;
+        start = 0;
+        return this;
+    }
+    public Location clone() {
+        return new Location(line, start, filename);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + line;
+        result = prime * result + start;
+        result = prime * result + ((filename == null) ? 0 : filename.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null) return false;
+        if (getClass() != obj.getClass()) return false;
+        Location other = (Location) obj;
+        if (line != other.line) return false;
+        if (start != other.start) return false;
+        if (filename == null && other.filename != null) return false;
+        else if (!filename.equals(other.filename)) return false;
+        return true;
+    }
+
+    @Override
+    public int compareTo(Location other) {
+        int a = filename.toString().compareTo(other.filename.toString());
+        int b = Integer.compare(line, other.line);
+        int c = Integer.compare(start, other.start);
+
+        if (a != 0) return a;
+        if (b != 0) return b;
+        return c;
+    }
+
+    public Location(int line, int start, Filename filename) {
+        this.line = line;
+        this.start = start;
+        this.filename = filename;
+    }
+
+    public static Location parse(String raw) {
+        int i0 = -1, i1 = -1;
+        for (var i = raw.length() - 1; i >= 0; i--) {
+            if (raw.charAt(i) == ':') {
+                if (i1 == -1) i1 = i;
+                else if (i0 == -1) {
+                    i0 = i;
+                    break;
+                }
+            }
+        }
+
+        return new Location(
+            Integer.parseInt(raw.substring(i0 + 1, i1)),
+            Integer.parseInt(raw.substring(i1 + 1)),
+            Filename.parse(raw.substring(0, i0))
+        );
+    }
+}

src/java/me/topchetoeu/jscript/common/Metadata.java

@@ -0,0 +1,29 @@
+package me.topchetoeu.jscript.common;
+
+import me.topchetoeu.jscript.common.json.JSON;
+
+public class Metadata {
+    private static final String VERSION;
+    private static final String AUTHOR;
+    private static final String NAME;
+
+    static {
+        var data = JSON.parse(null, Reading.resourceToString("metadata.json")).map();
+        VERSION = data.string("version");
+        AUTHOR = data.string("author");
+        NAME = data.string("name");
+    }
+
+    public static String version() {
+        if (VERSION.equals("$" + "{VERSION}")) return "1337-devel";
+        else return VERSION;
+    }
+    public static String author() {
+        if (AUTHOR.equals("$" + "{AUTHOR}")) return "anonymous";
+        else return AUTHOR;
+    }
+    public static String name() {
+        if (NAME.equals("$" + "{NAME}")) return "some-product";
+        else return NAME;
+    }
+}

src/java/me/topchetoeu/jscript/common/Operation.java

@@ -0,0 +1,54 @@
+package me.topchetoeu.jscript.common;
+
+import java.util.HashMap;
+
+public enum Operation {
+    INSTANCEOF(1, 2),
+    IN(2, 2),
+
+    MULTIPLY(3, 2),
+    DIVIDE(4, 2),
+    MODULO(5, 2),
+    ADD(6, 2),
+    SUBTRACT(7, 2),
+
+    USHIFT_RIGHT(8, 2),
+    SHIFT_RIGHT(9, 2),
+    SHIFT_LEFT(10, 2),
+
+    GREATER(11, 2),
+    LESS(12, 2),
+    GREATER_EQUALS(13, 2),
+    LESS_EQUALS(14, 2),
+    LOOSE_EQUALS(15, 2),
+    LOOSE_NOT_EQUALS(16, 2),
+    EQUALS(17, 2),
+    NOT_EQUALS(18, 2),
+
+    AND(19, 2),
+    OR(20, 2),
+    XOR(21, 2),
+
+    NEG(23, 1),
+    POS(24, 1),
+    NOT(25, 1),
+    INVERSE(26, 1);
+
+    private static final HashMap<Integer, Operation> operations = new HashMap<>();
+
+    static {
+        for (var val : Operation.values()) operations.put(val.numeric, val);
+    }
+
+    public final int numeric;
+    public final int operands;
+
+    private Operation(int numeric, int n) {
+        this.numeric = numeric;
+        this.operands = n;
+    }
+
+    public static Operation fromNumeric(int i) {
+        return operations.get(i);
+    }
+}

src/java/me/topchetoeu/jscript/common/Reading.java

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.common;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UncheckedIOException;
+
+public class Reading {
+    private static final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+
+    public static synchronized String readline() throws IOException {
+        return reader.readLine();
+    }
+
+    public static String streamToString(InputStream in) {
+        try {
+            return new String(in.readAllBytes());
+        }
+        catch (IOException e) { throw new UncheckedIOException(e); }
+    }
+    public static InputStream resourceToStream(String name) {
+        return Reading.class.getResourceAsStream("/" + name);
+    }
+    public static String resourceToString(String name) {
+        return streamToString(resourceToStream(name));
+    }
+}

src/java/me/topchetoeu/jscript/common/RefTracker.java

@@ -0,0 +1,23 @@
+package me.topchetoeu.jscript.common;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+
+public class RefTracker {
+    public static void onDestroy(Object obj, Runnable runnable) {
+        var queue = new ReferenceQueue<>();
+        var ref = new WeakReference<>(obj, queue);
+        obj = null;
+
+        var th = new Thread(() -> {
+            try {
+                queue.remove();
+                ref.get();
+                runnable.run();
+            }
+            catch (InterruptedException e) { return; }
+        });
+        th.setDaemon(true);
+        th.start();
+    }
+}

src/java/me/topchetoeu/jscript/common/ResultRunnable.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.common;
+
+public interface ResultRunnable<T> {
+    T run();
+}

src/java/me/topchetoeu/jscript/common/events/DataNotifier.java

@@ -1,6 +1,6 @@
-package me.topchetoeu.jscript.events;
+package me.topchetoeu.jscript.common.events;
 
-public class DataNotifier<T> implements Awaitable<T> {
+public class DataNotifier<T> {
     private Notifier notifier = new Notifier();
     private boolean isErr;
     private T val;
@@ -11,15 +11,12 @@ public class DataNotifier<T> implements Awaitable<T> {
         isErr = true;
         notifier.next();
     }
-    public void error(Throwable t) {
-        error(new RuntimeException(t));
-    }
     public void next(T val) {
         this.val = val;
         isErr = false;
         notifier.next();
     }
-    public T await() throws InterruptedException {
+    public T await() {
         notifier.await();
 
         try {

src/java/me/topchetoeu/jscript/common/events/Notifier.java

@@ -0,0 +1,19 @@
+package me.topchetoeu.jscript.common.events;
+
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
+
+public class Notifier {
+    private boolean ok = false;
+
+    public synchronized void next() {
+        ok = true;
+        notifyAll();
+    }
+    public synchronized void await() {
+        try {
+            while (!ok) wait();
+            ok = false;
+        }
+        catch (InterruptedException e) { throw new InterruptException(e); }
+    }
+}

src/java/me/topchetoeu/jscript/common/json/JSON.java

@@ -1,29 +1,96 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
+import java.util.HashSet;
 import java.util.List;
 import java.util.stream.Collectors;
 
-import me.topchetoeu.jscript.exceptions.SyntaxException;
-import me.topchetoeu.jscript.parsing.Operator;
-import me.topchetoeu.jscript.parsing.ParseRes;
-import me.topchetoeu.jscript.parsing.Parsing;
-import me.topchetoeu.jscript.parsing.Token;
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.compilation.parsing.Operator;
+import me.topchetoeu.jscript.compilation.parsing.ParseRes;
+import me.topchetoeu.jscript.compilation.parsing.Parsing;
+import me.topchetoeu.jscript.compilation.parsing.Token;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 public class JSON {
+    public static Object toJs(JSONElement val) {
+        if (val.isBoolean()) return val.bool();
+        if (val.isString()) return val.string();
+        if (val.isNumber()) return val.number();
+        if (val.isList()) return ArrayValue.of(null, val.list().stream().map(JSON::toJs).collect(Collectors.toList()));
+        if (val.isMap()) {
+            var res = new ObjectValue();
+            for (var el : val.map().entrySet()) {
+                res.defineProperty(null, el.getKey(), toJs(el.getValue()));
+            }
+            return res;
+        }
+        if (val.isNull()) return Values.NULL;
+        return null;
+    }
+    private static JSONElement fromJs(Context ctx, Object val, HashSet<Object> prev) {
+        if (val instanceof Boolean) return JSONElement.bool((boolean)val);
+        if (val instanceof Number) return JSONElement.number(((Number)val).doubleValue());
+        if (val instanceof String) return JSONElement.string((String)val);
+        if (val == Values.NULL) return JSONElement.NULL;
+        if (val instanceof ArrayValue) {
+            if (prev.contains(val)) throw new EngineException("Circular dependency in JSON.");
+            prev.add(val);
+
+            var res = new JSONList();
+
+            for (var el : ((ArrayValue)val).toArray()) {
+                var jsonEl = fromJs(ctx, el, prev);
+                if (jsonEl == null) jsonEl = JSONElement.NULL;
+                res.add(jsonEl);
+            }
+
+            prev.remove(val);
+            return JSONElement.of(res);
+        }
+        if (val instanceof ObjectValue) {
+            if (prev.contains(val)) throw new EngineException("Circular dependency in JSON.");
+            prev.add(val);
+
+            var res = new JSONMap();
+
+            for (var el : Values.getMembers(ctx, val, false, false)) {
+                var jsonEl = fromJs(ctx, Values.getMember(ctx, val, el), prev);
+                if (jsonEl == null) continue;
+                if (el instanceof String || el instanceof Number) res.put(el.toString(), jsonEl);
+            }
+
+            prev.remove(val);
+            return JSONElement.of(res);
+        }
+        if (val == null) return null;
+        return null;
+    }
+    public static JSONElement fromJs(Context ctx, Object val) {
+        return fromJs(ctx, val, new HashSet<>());
+    }
+
     public static ParseRes<String> parseIdentifier(List<Token> tokens, int i) {
         return Parsing.parseIdentifier(tokens, i);
     }
-    public static ParseRes<String> parseString(String filename, List<Token> tokens, int i) {
+    public static ParseRes<String> parseString(Filename filename, List<Token> tokens, int i) {
         var res = Parsing.parseString(filename, tokens, i);
         if (res.isSuccess()) return ParseRes.res((String)res.result.value, res.n);
         else return res.transform();
     }
-    public static ParseRes<Double> parseNumber(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Double> parseNumber(Filename filename, List<Token> tokens, int i) {
+        var minus = Parsing.isOperator(tokens, i, Operator.SUBTRACT);
+        if (minus) i++;
+
         var res = Parsing.parseNumber(filename, tokens, i);
-        if (res.isSuccess()) return ParseRes.res((Double)res.result.value, res.n);
+        if (res.isSuccess()) return ParseRes.res((minus ? -1 : 1) * (Double)res.result.value, res.n + (minus ? 1 : 0));
         else return res.transform();
     }
-    public static ParseRes<Boolean> parseBool(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Boolean> parseBool(Filename filename, List<Token> tokens, int i) {
         var id = parseIdentifier(tokens, i);
 
         if (!id.isSuccess()) return ParseRes.failed();
@@ -32,7 +99,7 @@ public class JSON {
         else return ParseRes.failed();
     }
 
-    public static ParseRes<?> parseValue(String filename, List<Token> tokens, int i) {
+    public static ParseRes<?> parseValue(Filename filename, List<Token> tokens, int i) {
         return ParseRes.any(
             parseString(filename, tokens, i),
             parseNumber(filename, tokens, i),
@@ -42,7 +109,7 @@ public class JSON {
         );
     }
 
-    public static ParseRes<JSONMap> parseMap(String filename, List<Token> tokens, int i) {
+    public static ParseRes<JSONMap> parseMap(Filename filename, List<Token> tokens, int i) {
         int n = 0;
         if (!Parsing.isOperator(tokens, i + n++, Operator.BRACE_OPEN)) return ParseRes.failed();
 
@@ -82,7 +149,7 @@ public class JSON {
 
         return ParseRes.res(values, n);
     }
-    public static ParseRes<JSONList> parseList(String filename, List<Token> tokens, int i) {
+    public static ParseRes<JSONList> parseList(Filename filename, List<Token> tokens, int i) {
         int n = 0;
         if (!Parsing.isOperator(tokens, i + n++, Operator.BRACKET_OPEN)) return ParseRes.failed();
 
@@ -109,7 +176,8 @@ public class JSON {
 
         return ParseRes.res(values, n);
     }
-    public static JSONElement parse(String filename, String raw) {
+    public static JSONElement parse(Filename filename, String raw) {
+        if (filename == null) filename = new Filename("jscript", "json");
         var res = parseValue(filename, Parsing.tokenize(filename, raw), 0);
         if (res.isFailed()) throw new SyntaxException(null, "Invalid JSON given.");
         else if (res.isError()) throw new SyntaxException(null, res.error);
@@ -120,7 +188,28 @@ public class JSON {
         if (el.isNumber()) return Double.toString(el.number());
         if (el.isBoolean()) return el.bool() ? "true" : "false";
         if (el.isNull()) return "null";
-        if (el.isString()) return "\"" + el.string().replace("\\", "\\\\").replace("\"", "\\\"") + "\"";
+        if (el.isString()) {
+            var res = new StringBuilder("\"");
+            var alphabet = "0123456789ABCDEF".toCharArray();
+
+            for (var c : el.string().toCharArray()) {
+                if (c < 32 || c >= 127) {
+                    res
+                        .append("\\u")
+                        .append(alphabet[(c >> 12) & 0xF])
+                        .append(alphabet[(c >> 8) & 0xF])
+                        .append(alphabet[(c >> 4) & 0xF])
+                        .append(alphabet[(c >> 0) & 0xF]);
+                }
+                else if (c == '\\')
+                    res.append("\\\\");
+                else if (c == '"')
+                    res.append("\\\"");
+                else res.append(c);
+            }
+
+            return res.append('"').toString();
+        }
         if (el.isList()) {
             var res = new StringBuilder().append("[");
             for (int i = 0; i < el.list().size(); i++) {

src/java/me/topchetoeu/jscript/common/json/JSONElement.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
 public class JSONElement {
     public static enum Type {
@@ -65,10 +65,22 @@ public class JSONElement {
         return (double)value;
     }
     public boolean bool() {
-        if (!isNumber()) throw new IllegalStateException("Element is not a boolean.");
+        if (!isBoolean()) throw new IllegalStateException("Element is not a boolean.");
         return (boolean)value;
     }
 
+    @Override
+    public String toString() {
+        if (isMap()) return "{...}";
+        if (isList()) return "[...]";
+        if (isString()) return (String)value;
+        if (isString()) return (String)value;
+        if (isNumber()) return (double)value + "";
+        if (isBoolean()) return (boolean)value + "";
+        if (isNull()) return "null";
+        return "";
+    }
+
     private JSONElement(Type type, Object val) {
         this.type = type;
         this.value = val;

src/java/me/topchetoeu/jscript/common/json/JSONList.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -10,6 +10,9 @@ public class JSONList extends ArrayList<JSONElement> {
     public JSONList(JSONElement ...els) {
         super(List.of(els));
     }
+    public JSONList(Collection<JSONElement> els) {
+        super(els);
+    }
 
     public JSONList addNull() { this.add(JSONElement.NULL); return this; }
     public JSONList add(String val) { this.add(JSONElement.of(val)); return this; }
@@ -17,5 +20,7 @@ public class JSONList extends ArrayList<JSONElement> {
     public JSONList add(boolean val) { this.add(JSONElement.of(val)); return this; }
     public JSONList add(Map<String, JSONElement> val) { this.add(JSONElement.of(val)); return this; }
     public JSONList add(Collection<JSONElement> val) { this.add(JSONElement.of(val)); return this; }
+    public JSONList add(JSONMap val) { this.add(JSONElement.of(val)); return this; }
+    public JSONList add(JSONList val) { this.add(JSONElement.of(val)); return this; }
 
 }

src/java/me/topchetoeu/jscript/common/json/JSONMap.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
 import java.util.Collection;
 import java.util.HashMap;
@@ -51,7 +51,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public JSONMap map(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.map();
     }
     public JSONMap map(String path, JSONMap defaultVal) {
@@ -63,7 +63,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public JSONList list(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.list();
     }
     public JSONList list(String path, JSONList defaultVal) {
@@ -75,7 +75,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public String string(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.string();
     }
     public String string(String path, String defaultVal) {
@@ -87,7 +87,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public double number(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.number();
     }
     public double number(String path, double defaultVal) {
@@ -99,7 +99,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public boolean bool(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.bool();
     }
     public boolean bool(String path, boolean defaultVal) {

src/java/me/topchetoeu/jscript/common/mapping/ConvertType.java

@@ -0,0 +1,8 @@
+package me.topchetoeu.jscript.common.mapping;
+
+public enum ConvertType {
+    Exact,
+    Lower,
+    Upper,
+    Both,
+}

src/java/me/topchetoeu/jscript/common/mapping/FunctionMap.java

@@ -0,0 +1,190 @@
+package me.topchetoeu.jscript.common.mapping;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableSet;
+import java.util.Objects;
+import java.util.TreeMap;
+import java.util.TreeSet;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.scope.LocalScopeRecord;
+import me.topchetoeu.jscript.utils.mapping.SourceMap;
+
+public class FunctionMap {
+    public static class FunctionMapBuilder {
+        private final TreeMap<Integer, Location> sourceMap = new TreeMap<>();
+        private final HashMap<Location, BreakpointType> breakpoints = new HashMap<>();
+
+        public Location toLocation(int pc) {
+            return sourceMap.headMap(pc, true).firstEntry().getValue();
+        }
+
+        public FunctionMapBuilder setDebug(Location loc, BreakpointType type) {
+            if (loc == null || type == null || type == BreakpointType.NONE) return this;
+            breakpoints.put(loc, type);
+            return this;
+        }
+        public FunctionMapBuilder setLocation(int i, Location loc) {
+            if (loc == null || i < 0) return this;
+            sourceMap.put(i, loc);
+            return this;
+        }
+        public FunctionMapBuilder setLocationAndDebug(int i, Location loc, BreakpointType type) {
+            setDebug(loc, type);
+            setLocation(i, loc);
+            return this;
+        }
+
+        public Location first() {
+            if (sourceMap.size() == 0) return null;
+            return sourceMap.firstEntry().getValue();
+        }
+        public Location last() {
+            if (sourceMap.size() == 0) return null;
+            return sourceMap.lastEntry().getValue();
+        }
+
+        public FunctionMap build(String[] localNames, String[] captureNames) {
+            return new FunctionMap(sourceMap, breakpoints, localNames, captureNames);
+        }
+        public FunctionMap build(LocalScopeRecord scope) {
+            return new FunctionMap(sourceMap, breakpoints, scope.locals(), scope.captures());
+        }
+        public FunctionMap build() {
+            return new FunctionMap(sourceMap, breakpoints, new String[0], new String[0]);
+        }
+
+        private FunctionMapBuilder() { }
+    }
+
+    public static final FunctionMap EMPTY = new FunctionMap();
+
+    private final HashMap<Integer, BreakpointType> bps = new HashMap<>();
+    private final HashMap<Filename, TreeSet<Location>> bpLocs = new HashMap<>();
+
+    private final TreeMap<Integer, Location> pcToLoc = new TreeMap<>();
+
+    public final String[] localNames, captureNames;
+
+    public Location toLocation(int pc, boolean approxiamte) {
+        if (pcToLoc.size() == 0 || pc < 0 || pc > pcToLoc.lastKey()) return null;
+        var res = pcToLoc.get(pc);
+        if (!approxiamte || res != null) return res;
+        var entry = pcToLoc.headMap(pc, true).lastEntry();
+        if (entry == null) return null;
+        else return entry.getValue();
+    }
+    public Location toLocation(int pc) {
+        return toLocation(pc, false);
+    }
+
+    public BreakpointType getBreakpoint(int pc) {
+        return bps.getOrDefault(pc, BreakpointType.NONE);
+    }
+    public Location correctBreakpoint(Location loc) {
+        var set = bpLocs.get(loc.filename());
+        if (set == null) return null;
+        else return set.ceiling(loc);
+    }
+    public List<Location> correctBreakpoint(Pattern filename, int line, int column) {
+        var candidates = new HashMap<Filename, TreeSet<Location>>();
+
+        for (var name : bpLocs.keySet()) {
+            if (filename.matcher(name.toString()).matches()) {
+                candidates.put(name, bpLocs.get(name));
+            }
+        }
+
+        var res = new ArrayList<Location>(candidates.size());
+        for (var candidate : candidates.entrySet()) {
+            res.add(candidate.getValue().ceiling(new Location(line, column, candidate.getKey())));
+        }
+
+        return res;
+    }
+    public List<Location> breakpoints(Location start, Location end) {
+        if (!Objects.equals(start.filename(), end.filename())) return List.of();
+        NavigableSet<Location> set = bpLocs.get(start.filename());
+        if (set == null) return List.of();
+
+        if (start != null) set = set.tailSet(start, true);
+        if (end != null) set = set.headSet(end, true);
+
+        return set.stream().collect(Collectors.toList());
+    }
+
+    public Location start() {
+        if (pcToLoc.size() == 0) return null;
+        return pcToLoc.firstEntry().getValue();
+    }
+    public Location end() {
+        if (pcToLoc.size() == 0) return null;
+        return pcToLoc.lastEntry().getValue();
+    }
+
+    public FunctionMap apply(SourceMap map) {
+        var res = new FunctionMap(Map.of(), Map.of(), localNames, captureNames);
+
+        for (var el : pcToLoc.entrySet()) {
+            res.pcToLoc.put(el.getKey(), map.toCompiled(el.getValue()));
+        }
+
+        res.bps.putAll(bps);
+
+        for (var el : bpLocs.entrySet()) {
+            for (var loc : el.getValue()) {
+                loc = map.toCompiled(loc);
+                if (loc == null) continue;
+
+                if (!res.bpLocs.containsKey(loc.filename())) res.bpLocs.put(loc.filename(), new TreeSet<>());
+                res.bpLocs.get(loc.filename()).add(loc);
+            }
+        }
+
+        return res;
+    }
+
+    public FunctionMap clone() {
+        var res = new FunctionMap(Map.of(), Map.of(), localNames, captureNames);
+        res.pcToLoc.putAll(this.pcToLoc);
+        res.bps.putAll(bps);
+        res.bpLocs.putAll(bpLocs);
+        res.pcToLoc.putAll(pcToLoc);
+        return res;
+    }
+
+    public FunctionMap(Map<Integer, Location> map, Map<Location, BreakpointType> breakpoints, String[] localNames, String[] captureNames) {
+        var locToPc = new HashMap<Location, Integer>();
+
+        for (var el : map.entrySet()) {
+            pcToLoc.put(el.getKey(), el.getValue());
+            locToPc.putIfAbsent(el.getValue(), el.getKey());
+        }
+
+        for (var el : breakpoints.entrySet()) {
+            if (el.getValue() == null || el.getValue() == BreakpointType.NONE) continue;
+            bps.put(locToPc.get(el.getKey()), el.getValue());
+
+            if (!bpLocs.containsKey(el.getKey().filename())) bpLocs.put(el.getKey().filename(), new TreeSet<>());
+            bpLocs.get(el.getKey().filename()).add(el.getKey());
+        }
+
+        this.localNames = localNames;
+        this.captureNames = captureNames;
+    }
+    private FunctionMap() {
+        localNames = new String[0];
+        captureNames = new String[0];
+    }
+
+    public static FunctionMapBuilder builder() {
+        return new FunctionMapBuilder();
+    }
+}

src/java/me/topchetoeu/jscript/compilation/AssignableStatement.java

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.compilation;
 
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.engine.Operation;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
 
 public abstract class AssignableStatement extends Statement {
     public abstract Statement toAssign(Statement val, Operation operation);

src/java/me/topchetoeu/jscript/compilation/CompileResult.java

@@ -0,0 +1,78 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.List;
+import java.util.LinkedList;
+import java.util.Vector;
+
+import me.topchetoeu.jscript.common.FunctionBody;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.mapping.FunctionMap;
+import me.topchetoeu.jscript.common.mapping.FunctionMap.FunctionMapBuilder;
+import me.topchetoeu.jscript.compilation.scope.LocalScopeRecord;
+
+public class CompileResult {
+    public final Vector<Instruction> instructions = new Vector<>();
+    public final List<CompileResult> children = new LinkedList<>();
+    public final FunctionMapBuilder map = FunctionMap.builder();
+    public final LocalScopeRecord scope;
+    public int length = 0;
+
+    public int temp() {
+        instructions.add(null);
+        return instructions.size() - 1;
+    }
+
+    public CompileResult add(Instruction instr) {
+        instructions.add(instr);
+        return this;
+    }
+    public CompileResult set(int i, Instruction instr) {
+        instructions.set(i, instr);
+        return this;
+    }
+    public Instruction get(int i) {
+        return instructions.get(i);
+    }
+    public int size() { return instructions.size(); }
+
+    public void setDebug(Location loc, BreakpointType type) {
+        map.setDebug(loc, type);
+    }
+    public void setLocation(int i, Location loc) {
+        map.setLocation(i, loc);
+    }
+    public void setLocationAndDebug(int i, Location loc, BreakpointType type) {
+        map.setLocationAndDebug(i, loc, type);
+    }
+    public void setDebug(BreakpointType type) {
+        setDebug(map.last(), type);
+    }
+    public void setLocation(Location type) {
+        setLocation(instructions.size() - 1, type);
+    }
+    public void setLocationAndDebug(Location loc, BreakpointType type) {
+        setLocationAndDebug(instructions.size() - 1, loc, type);
+    }
+
+    public CompileResult addChild(CompileResult child) {
+        this.children.add(child);
+        return child;
+    }
+
+    public FunctionMap map() {
+        return map.build(scope);
+    }
+    public FunctionBody body() {
+        var builtChildren = new FunctionBody[children.size()];
+
+        for (var i = 0; i < children.size(); i++) builtChildren[i] = children.get(i).body();
+
+        return new FunctionBody(scope.localsCount(), length, instructions.toArray(Instruction[]::new), builtChildren);
+    }
+
+    public CompileResult(LocalScopeRecord scope) {
+        this.scope = scope;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/CompoundStatement.java

@@ -0,0 +1,64 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.List;
+import java.util.Vector;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.values.FunctionStatement;
+
+public class CompoundStatement extends Statement {
+    public final Statement[] statements;
+    public final boolean separateFuncs;
+    public Location end;
+
+    @Override public boolean pure() {
+        for (var stm : statements) {
+            if (!stm.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void declare(CompileResult target) {
+        for (var stm : statements) stm.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+        List<Statement> statements = new Vector<Statement>();
+        if (separateFuncs) for (var stm : this.statements) {
+            if (stm instanceof FunctionStatement && ((FunctionStatement)stm).statement) {
+                stm.compile(target, false);
+            }
+            else statements.add(stm);
+        }
+        else statements = List.of(this.statements);
+
+        var polluted = false;
+
+        for (var i = 0; i < statements.size(); i++) {
+            var stm = statements.get(i);
+
+            if (i != statements.size() - 1) stm.compile(target, false, BreakpointType.STEP_OVER);
+            else stm.compile(target, polluted = pollute, BreakpointType.STEP_OVER);
+        }
+
+        if (!polluted && pollute) {
+            target.add(Instruction.pushUndefined());
+        }
+    }
+
+    public CompoundStatement setEnd(Location loc) {
+        this.end = loc;
+        return this;
+    }
+
+    public CompoundStatement(Location loc, boolean separateFuncs, Statement ...statements) {
+        super(loc);
+        this.separateFuncs = separateFuncs;
+        this.statements = statements;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/Statement.java

@@ -0,0 +1,27 @@
+package me.topchetoeu.jscript.compilation;
+
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+
+public abstract class Statement {
+    private Location _loc;
+
+    public boolean pure() { return false; }
+    public void declare(CompileResult target) { }
+
+    public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+        int start = target.size();
+        compile(target, pollute);
+        if (target.size() != start) target.setLocationAndDebug(start, loc(), type);
+    }
+    public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, BreakpointType.NONE);
+    }
+
+    public Location loc() { return _loc; }
+    public void setLoc(Location loc) { _loc = loc; }
+
+    protected Statement(Location loc) {
+        this._loc = loc;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/ThrowSyntaxStatement.java

@@ -0,0 +1,18 @@
+package me.topchetoeu.jscript.compilation;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+
+public class ThrowSyntaxStatement extends Statement {
+    public final String name;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.throwSyntax(name));
+    }
+
+    public ThrowSyntaxStatement(SyntaxException e) {
+        super(e.loc);
+        this.name = e.msg;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/VariableDeclareStatement.java

@@ -0,0 +1,52 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.List;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.values.FunctionStatement;
+
+public class VariableDeclareStatement extends Statement {
+    public static class Pair {
+        public final String name;
+        public final Statement value;
+        public final Location location;
+
+        public Pair(String name, Statement value, Location location) {
+            this.name = name;
+            this.value = value;
+            this.location = location;
+        }
+    }
+
+    public final List<Pair> values;
+
+    @Override
+    public void declare(CompileResult target) {
+        for (var key : values) {
+            target.scope.define(key.name);
+        }
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        for (var entry : values) {
+            if (entry.name == null) continue;
+            var key = target.scope.getKey(entry.name);
+
+            if (key instanceof String) target.add(Instruction.makeVar((String)key));
+
+            if (entry.value != null) {
+                FunctionStatement.compileWithName(entry.value, target, true, entry.name, BreakpointType.STEP_OVER);
+                target.add(Instruction.storeVar(key));
+            }
+        }
+
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public VariableDeclareStatement(Location loc, List<Pair> values) {
+        super(loc);
+        this.values = values;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/BreakStatement.java

@@ -0,0 +1,21 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class BreakStatement extends Statement {
+    public final String label;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.nop("break", label));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public BreakStatement(Location loc, String label) {
+        super(loc);
+        this.label = label;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/ContinueStatement.java

@@ -0,0 +1,21 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ContinueStatement extends Statement {
+    public final String label;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.nop(loc(), "cont", label));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ContinueStatement(Location loc, String label) {
+        super(loc);
+        this.label = label;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/DebugStatement.java

@@ -0,0 +1,18 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DebugStatement extends Statement {
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.debug());
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public DebugStatement(Location loc) {
+        super(loc);
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/DeleteStatement.java

@@ -0,0 +1,26 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DeleteStatement extends Statement {
+    public final Statement key;
+    public final Statement value;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        value.compile(target, true);
+        key.compile(target, true);
+
+        target.add(Instruction.delete());
+        if (pollute) target.add(Instruction.pushValue(true));
+    }
+
+    public DeleteStatement(Location loc, Statement key, Statement value) {
+        super(loc);
+        this.key = key;
+        this.value = value;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/DoWhileStatement.java

@@ -0,0 +1,36 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DoWhileStatement extends Statement {
+    public final Statement condition, body;
+    public final String label;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        int start = target.size();
+        body.compile(target, false, BreakpointType.STEP_OVER);
+        int mid = target.size();
+        condition.compile(target, true, BreakpointType.STEP_OVER);
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, start, mid - 1, mid, end + 1);
+        target.add(Instruction.jmpIf(start - end));
+    }
+
+    public DoWhileStatement(Location loc, String label, Statement condition, Statement body) {
+        super(loc);
+        this.label = label;
+        this.condition = condition;
+        this.body = body;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/ForInStatement.java

@@ -0,0 +1,69 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ForInStatement extends Statement {
+    public final String varName;
+    public final boolean isDeclaration;
+    public final Statement varValue, object, body;
+    public final String label;
+    public final Location varLocation;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+        if (isDeclaration) target.scope.define(varName);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var key = target.scope.getKey(varName);
+
+        if (key instanceof String) target.add(Instruction.makeVar((String)key));
+
+        if (varValue != null) {
+            varValue.compile(target, true);
+            target.add(Instruction.storeVar(target.scope.getKey(varName)));
+        }
+
+        object.compile(target, true, BreakpointType.STEP_OVER);
+        target.add(Instruction.keys(true));
+
+        int start = target.size();
+        target.add(Instruction.dup());
+        target.add(Instruction.pushUndefined());
+        target.add(Instruction.operation(Operation.EQUALS));
+        int mid = target.temp();
+
+        target.add(Instruction.pushValue("value")).setLocation(varLocation);
+        target.add(Instruction.loadMember()).setLocation(varLocation);
+        target.add(Instruction.storeVar(key)).setLocationAndDebug(object.loc(), BreakpointType.STEP_OVER);
+
+        body.compile(target, false, BreakpointType.STEP_OVER);
+
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, mid + 1, end, start, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.add(Instruction.discard());
+        target.set(mid, Instruction.jmpIf(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ForInStatement(Location loc, Location varLocation, String label, boolean isDecl, String varName, Statement varValue, Statement object, Statement body) {
+        super(loc);
+        this.varLocation = varLocation;
+        this.label = label;
+        this.isDeclaration = isDecl;
+        this.varName = varName;
+        this.varValue = varValue;
+        this.object = object;
+        this.body = body;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/ForOfStatement.java

@@ -0,0 +1,73 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ForOfStatement extends Statement {
+    public final String varName;
+    public final boolean isDeclaration;
+    public final Statement iterable, body;
+    public final String label;
+    public final Location varLocation;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+        if (isDeclaration) target.scope.define(varName);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var key = target.scope.getKey(varName);
+
+        if (key instanceof String) target.add(Instruction.makeVar((String)key));
+
+        iterable.compile(target, true, BreakpointType.STEP_OVER);
+        target.add(Instruction.dup());
+        target.add(Instruction.loadVar("Symbol"));
+        target.add(Instruction.pushValue("iterator"));
+        target.add(Instruction.loadMember()).setLocation(iterable.loc());
+        target.add(Instruction.loadMember()).setLocation(iterable.loc());
+        target.add(Instruction.call(0)).setLocation(iterable.loc());
+
+        int start = target.size();
+        target.add(Instruction.dup());
+        target.add(Instruction.dup());
+        target.add(Instruction.pushValue("next"));
+        target.add(Instruction.loadMember()).setLocation(iterable.loc());
+        target.add(Instruction.call(0)).setLocation(iterable.loc());
+        target.add(Instruction.dup());
+        target.add(Instruction.pushValue("done"));
+        target.add(Instruction.loadMember()).setLocation(iterable.loc());
+        int mid = target.temp();
+
+        target.add(Instruction.pushValue("value"));
+        target.add(Instruction.loadMember()).setLocation(varLocation);
+        target.add(Instruction.storeVar(key)).setLocationAndDebug(iterable.loc(), BreakpointType.STEP_OVER);
+
+        body.compile(target, false, BreakpointType.STEP_OVER);
+
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, mid + 1, end, start, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.add(Instruction.discard());
+        target.add(Instruction.discard());
+        target.set(mid, Instruction.jmpIf(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ForOfStatement(Location loc, Location varLocation, String label, boolean isDecl, String varName, Statement object, Statement body) {
+        super(loc);
+        this.varLocation = varLocation;
+        this.label = label;
+        this.isDeclaration = isDecl;
+        this.varName = varName;
+        this.iterable = object;
+        this.body = body;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/ForStatement.java

@@ -0,0 +1,45 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ForStatement extends Statement {
+    public final Statement declaration, assignment, condition, body;
+    public final String label;
+
+    @Override
+    public void declare(CompileResult target) {
+        declaration.declare(target);
+        body.declare(target);
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        declaration.compile(target, false, BreakpointType.STEP_OVER);
+
+        int start = target.size();
+        condition.compile(target, true, BreakpointType.STEP_OVER);
+        int mid = target.temp();
+        body.compile(target, false, BreakpointType.STEP_OVER);
+        int beforeAssign = target.size();
+        assignment.compile(target, false, BreakpointType.STEP_OVER);
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, mid + 1, end, beforeAssign, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.set(mid, Instruction.jmpIfNot(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ForStatement(Location loc, String label, Statement declaration, Statement condition, Statement assignment, Statement body) {
+        super(loc);
+        this.label = label;
+        this.declaration = declaration;
+        this.condition = condition;
+        this.assignment = assignment;
+        this.body = body;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/IfStatement.java

@@ -0,0 +1,48 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class IfStatement extends Statement {
+    public final Statement condition, body, elseBody;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+        if (elseBody != null) elseBody.declare(target);
+    }
+
+    @Override public void compile(CompileResult target, boolean pollute, BreakpointType breakpoint) {
+        condition.compile(target, true, breakpoint);
+
+        if (elseBody == null) {
+            int i = target.temp();
+            body.compile(target, pollute, breakpoint);
+            int endI = target.size();
+            target.set(i, Instruction.jmpIfNot(endI - i));
+        }
+        else {
+            int start = target.temp();
+            body.compile(target, pollute, breakpoint);
+            int mid = target.temp();
+            elseBody.compile(target, pollute, breakpoint);
+            int end = target.size();
+
+            target.set(start, Instruction.jmpIfNot(mid - start + 1));
+            target.set(mid, Instruction.jmp(end - mid));
+        }
+    }
+    @Override public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, BreakpointType.STEP_IN);
+    }
+
+    public IfStatement(Location loc, Statement condition, Statement body, Statement elseBody) {
+        super(loc);
+        this.condition = condition;
+        this.body = body;
+        this.elseBody = elseBody;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/ReturnStatement.java

@@ -0,0 +1,22 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ReturnStatement extends Statement {
+    public final Statement value;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (value == null) target.add(Instruction.pushUndefined());
+        else value.compile(target, true);
+        target.add(Instruction.ret()).setLocation(loc());
+    }
+
+    public ReturnStatement(Location loc, Statement value) {
+        super(loc);
+        this.value = value;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/SwitchStatement.java

@@ -0,0 +1,83 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.Instruction.Type;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class SwitchStatement extends Statement {
+    public static class SwitchCase {
+        public final Statement value;
+        public final int statementI;
+
+        public SwitchCase(Statement value, int statementI) {
+            this.value = value;
+            this.statementI = statementI;
+        }
+    }
+
+    public final Statement value;
+    public final SwitchCase[] cases;
+    public final Statement[] body;
+    public final int defaultI;
+
+    @Override
+    public void declare(CompileResult target) {
+        for (var stm : body) stm.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var caseToStatement = new HashMap<Integer, Integer>();
+        var statementToIndex = new HashMap<Integer, Integer>();
+
+        value.compile(target, true, BreakpointType.STEP_OVER);
+
+        for (var ccase : cases) {
+            target.add(Instruction.dup());
+            ccase.value.compile(target, true);
+            target.add(Instruction.operation(Operation.EQUALS));
+            caseToStatement.put(target.temp(), ccase.statementI);
+        }
+
+        int start = target.temp();
+
+        for (var stm : body) {
+            statementToIndex.put(statementToIndex.size(), target.size());
+            stm.compile(target, false, BreakpointType.STEP_OVER);
+        }
+
+        int end = target.size();
+        target.add(Instruction.discard());
+        if (pollute) target.add(Instruction.pushUndefined());
+
+        if (defaultI < 0 || defaultI >= body.length) target.set(start, Instruction.jmp(end - start));
+        else target.set(start, Instruction.jmp(statementToIndex.get(defaultI) - start));
+
+        for (int i = start; i < end; i++) {
+            var instr = target.get(i);
+            if (instr.type == Type.NOP && instr.is(0, "break") && instr.get(1) == null) {
+                target.set(i, Instruction.jmp(end - i));
+            }
+        }
+        for (var el : caseToStatement.entrySet()) {
+            var i = statementToIndex.get(el.getValue());
+            if (i == null) i = end;
+            target.set(el.getKey(), Instruction.jmpIf(i - el.getKey()));
+        }
+
+    }
+
+    public SwitchStatement(Location loc, Statement value, int defaultI, SwitchCase[] cases, Statement[] body) {
+        super(loc);
+        this.value = value;
+        this.defaultI = defaultI;
+        this.cases = cases;
+        this.body = body;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/ThrowStatement.java

@@ -0,0 +1,21 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ThrowStatement extends Statement {
+    public final Statement value;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        value.compile(target, true);
+        target.add(Instruction.throwInstr()).setLocation(loc());
+    }
+
+    public ThrowStatement(Location loc, Statement value) {
+        super(loc);
+        this.value = value;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/TryStatement.java

@@ -0,0 +1,58 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class TryStatement extends Statement {
+    public final Statement tryBody;
+    public final Statement catchBody;
+    public final Statement finallyBody;
+    public final String name;
+
+    @Override
+    public void declare(CompileResult target) {
+        tryBody.declare(target);
+        if (catchBody != null) catchBody.declare(target);
+        if (finallyBody != null) finallyBody.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute, BreakpointType bpt) {
+        int replace = target.temp();
+
+        int start = replace + 1, catchStart = -1, finallyStart = -1;
+
+        tryBody.compile(target, false);
+        target.add(Instruction.tryEnd());
+
+        if (catchBody != null) {
+            catchStart = target.size() - start;
+            target.scope.define(name, true);
+            catchBody.compile(target, false);
+            target.scope.undefine();
+            target.add(Instruction.tryEnd());
+        }
+
+        if (finallyBody != null) {
+            finallyStart = target.size() - start;
+            finallyBody.compile(target, false);
+            target.add(Instruction.tryEnd());
+        }
+
+        target.set(replace, Instruction.tryStart(catchStart, finallyStart, target.size() - start));
+        target.setLocationAndDebug(replace, loc(), BreakpointType.STEP_OVER);
+
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public TryStatement(Location loc, Statement tryBody, Statement catchBody, Statement finallyBody, String name) {
+        super(loc);
+        this.tryBody = tryBody;
+        this.catchBody = catchBody;
+        this.finallyBody = finallyBody;
+        this.name = name;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/control/WhileStatement.java

@@ -0,0 +1,52 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.Instruction.Type;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class WhileStatement extends Statement {
+    public final Statement condition, body;
+    public final String label;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        int start = target.size();
+        condition.compile(target, true);
+        int mid = target.temp();
+        body.compile(target, false, BreakpointType.STEP_OVER);
+
+        int end = target.size();
+
+        replaceBreaks(target, label, mid + 1, end, start, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.set(mid, Instruction.jmpIfNot(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public WhileStatement(Location loc, String label, Statement condition, Statement body) {
+        super(loc);
+        this.label = label;
+        this.condition = condition;
+        this.body = body;
+    }
+
+    public static void replaceBreaks(CompileResult target, String label, int start, int end, int continuePoint, int breakPoint) {
+        for (int i = start; i < end; i++) {
+            var instr = target.get(i);
+            if (instr.type == Type.NOP && instr.is(0, "cont") && (instr.get(1) == null || instr.is(1, label))) {
+                target.set(i, Instruction.jmp(continuePoint - i));
+            }
+            if (instr.type == Type.NOP && instr.is(0, "break") && (instr.get(1) == null || instr.is(1, label))) {
+                target.set(i, Instruction.jmp(breakPoint - i));
+            }
+        }
+    }
+}

src/java/me/topchetoeu/jscript/compilation/parsing/Operator.java

@@ -1,9 +1,9 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 import java.util.HashMap;
 import java.util.Map;
 
-import me.topchetoeu.jscript.engine.Operation;
+import me.topchetoeu.jscript.common.Operation;
 
 public enum Operator {
     MULTIPLY("*", Operation.MULTIPLY, 13),
@@ -55,7 +55,7 @@ public enum Operator {
     INCREASE("++"),
     DECREASE("--");
 
-    public final String value;
+    public final String readable;
     public final Operation operation;
     public final int precedence;
     public final boolean reverse;
@@ -63,7 +63,7 @@ public enum Operator {
 
     static {
         for (var el : Operator.values()) {
-            ops.put(el.value, el);
+            ops.put(el.readable, el);
         }
     }
 
@@ -74,38 +74,38 @@ public enum Operator {
     }
 
     private Operator() {
-        this.value = null;
+        this.readable = null;
         this.operation = null;
         this.precedence = -1;
         this.reverse = false;
     }
     private Operator(String value) {
-        this. value = value;
+        this.readable = value;
         this.operation = null;
         this.precedence = -1;
         this.reverse = false;
     }
     private Operator(String value, int precedence) {
-        this. value = value;
+        this.readable = value;
         this.operation = null;
         this.precedence = precedence;
         this.reverse = false;
     }
     private Operator(String value, int precedence, boolean reverse) {
-        this. value = value;
+        this.readable = value;
         this.operation = null;
         this.precedence = precedence;
         this.reverse = reverse;
     }
 
     private Operator(String value, Operation funcName, int precedence) {
-        this. value = value;
+        this.readable = value;
         this.operation = funcName;
         this.precedence = precedence;
         this.reverse = false;
     }
     private Operator(String value, Operation funcName, int precedence, boolean reverse) {
-        this.value = value;
+        this.readable = value;
         this.operation = funcName;
         this.precedence = precedence;
         this.reverse = reverse;

src/java/me/topchetoeu/jscript/compilation/parsing/ParseRes.java

@@ -1,10 +1,10 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 import java.util.List;
 import java.util.Map;
 
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.parsing.Parsing.Parser;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.parsing.Parsing.Parser;
 
 public class ParseRes<T> {
     public static enum State {
@@ -69,6 +69,9 @@ public class ParseRes<T> {
 
     @SafeVarargs
     public static <T> ParseRes<? extends T> any(ParseRes<? extends T> ...parsers) {
+        return any(List.of(parsers));
+    }
+    public static <T> ParseRes<? extends T> any(List<ParseRes<? extends T>> parsers) {
         ParseRes<? extends T> best = null;
         ParseRes<? extends T> error = ParseRes.failed();
 

src/java/me/topchetoeu/jscript/compilation/parsing/Parsing.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -7,33 +7,31 @@ import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
 import me.topchetoeu.jscript.compilation.*;
-import me.topchetoeu.jscript.compilation.Instruction.Type;
 import me.topchetoeu.jscript.compilation.VariableDeclareStatement.Pair;
 import me.topchetoeu.jscript.compilation.control.*;
 import me.topchetoeu.jscript.compilation.control.SwitchStatement.SwitchCase;
+import me.topchetoeu.jscript.compilation.parsing.ParseRes.State;
+import me.topchetoeu.jscript.compilation.scope.LocalScopeRecord;
 import me.topchetoeu.jscript.compilation.values.*;
-import me.topchetoeu.jscript.engine.Environment;
-import me.topchetoeu.jscript.engine.Operation;
-import me.topchetoeu.jscript.engine.scope.ValueVariable;
-import me.topchetoeu.jscript.engine.values.CodeFunction;
-import me.topchetoeu.jscript.engine.values.Values;
-import me.topchetoeu.jscript.exceptions.SyntaxException;
-import me.topchetoeu.jscript.parsing.ParseRes.State;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
 
 // TODO: this has to be rewritten
 public class Parsing {
     public static interface Parser<T> {
-        ParseRes<T> parse(String filename, List<Token> tokens, int i);
+        ParseRes<T> parse(Filename filename, List<Token> tokens, int i);
     }
 
     private static class ObjProp {
-        public final Object name;
+        public final String name;
         public final String access;
         public final FunctionStatement func;
 
-        public ObjProp(Object name, String access, FunctionStatement func) {
+        public ObjProp(String name, String access, FunctionStatement func) {
             this.name = name;
             this.access = access;
             this.func = func;
@@ -69,7 +67,7 @@ public class Parsing {
         reserved.add("delete");
         reserved.add("break");
         reserved.add("continue");
-        reserved.add("debug");
+        reserved.add("debugger");
         reserved.add("implements");
         reserved.add("interface");
         reserved.add("package");
@@ -80,8 +78,6 @@ public class Parsing {
         // Although ES5 allow these, we will comply to ES6 here
         reserved.add("const");
         reserved.add("let");
-        reserved.add("async");
-        reserved.add("super");
         // These are allowed too, however our parser considers them keywords
         reserved.add("undefined");
         reserved.add("arguments");
@@ -91,7 +87,6 @@ public class Parsing {
         // We allow yield and await, because they're part of the custom async and generator functions
     }
 
-
     public static boolean isDigit(char c) {
         return c >= '0' && c <= '9';
     }
@@ -122,7 +117,7 @@ public class Parsing {
     private static final int CURR_MULTI_COMMENT = 8;
     private static final int CURR_SINGLE_COMMENT = 9;
 
-    private static void addToken(StringBuilder currToken, int currStage, int line, int lastStart, String filename, List<RawToken> tokens) {
+    private static void addToken(StringBuilder currToken, int currStage, int line, int lastStart, Filename filename, List<RawToken> tokens) {
         var res = currToken.toString();
 
         switch (currStage) {
@@ -143,7 +138,7 @@ public class Parsing {
 
     // This method is so long because we're tokenizing the string using an iterative approach
     // instead of a recursive descent parser. This is mainly done for performance reasons.
-    private static ArrayList<RawToken> splitTokens(String filename, String raw) {
+    private static ArrayList<RawToken> splitTokens(Filename filename, String raw) {
         var tokens = new ArrayList<RawToken>();
         var currToken = new StringBuilder(64);
 
@@ -219,8 +214,10 @@ public class Parsing {
                     currToken.append(c);
                     continue;
                 case CURR_SCIENTIFIC_NOT:
-                    if (c == '-') currStage = CURR_NEG_SCIENTIFIC_NOT;
-                    else if (!isDigit(c)) {
+                    if (c == '-') {
+                        if (currToken.toString().endsWith("e")) currStage = CURR_NEG_SCIENTIFIC_NOT;
+                    }
+                    if (currStage == CURR_SCIENTIFIC_NOT && !isDigit(c)) {
                         i--; start--;
                         break;
                     }
@@ -257,7 +254,7 @@ public class Parsing {
                     }
                     break;
                 case CURR_LITERAL:
-                    if (isAlphanumeric(c) || c == '_') {
+                    if (isAlphanumeric(c) || c == '_' || c == '$') {
                         currToken.append(c);
                         continue;
                     }
@@ -397,13 +394,17 @@ public class Parsing {
         return tokens;
     }
 
-    private static int fromHex(char c) {
+    public static int fromHex(char c) {
         if (c >= 'A' && c <= 'F') return c - 'A' + 10;
         if (c >= 'a' && c <= 'f') return c - 'a' + 10;
         if (c >= '0' && c <= '9') return c - '0';
         return -1;
     }
 
+    private static boolean inBounds(List<Token> tokens, int i) {
+        return i >= 0 && i < tokens.size();
+    }
+
     private static String parseString(Location loc, String literal) {
         var res = new StringBuilder();
 
@@ -568,20 +569,21 @@ public class Parsing {
     }
     private static double parseNumber(Location loc, String value) {
         var res = parseNumber(false, value);
-        if (res == null) throw new SyntaxException(loc, "Invalid number format.");
+        if (res == null)
+            throw new SyntaxException(loc, "Invalid number format.");
         else return res;
     }
 
-    private static List<Token> parseTokens(String filename, Collection<RawToken> tokens) {
+    private static List<Token> parseTokens(Filename filename, Collection<RawToken> tokens) {
         var res = new ArrayList<Token>();
 
         for (var el : tokens) {
             var loc = new Location(el.line, el.start, filename);
             switch (el.type) {
                 case LITERAL: res.add(Token.identifier(el.line, el.start, el.value)); break;
-                case NUMBER: res.add(Token.number(el.line, el.start, parseNumber(loc, el.value))); break;
-                case STRING: res.add(Token.string(el.line, el.start, parseString(loc, el.value))); break;
-                case REGEX: res.add(Token.regex(el.line, el.start, parseRegex(loc, el.value))); break;
+                case NUMBER: res.add(Token.number(el.line, el.start, parseNumber(loc, el.value), el.value)); break;
+                case STRING: res.add(Token.string(el.line, el.start, parseString(loc, el.value), el.value)); break;
+                case REGEX: res.add(Token.regex(el.line, el.start, parseRegex(loc, el.value), el.value)); break;
                 case OPERATOR:
                     Operator op = Operator.parse(el.value);
                     if (op == null) throw new SyntaxException(loc, String.format("Unrecognized operator '%s'.", el.value));
@@ -593,11 +595,11 @@ public class Parsing {
         return res;
     }
 
-    public static List<Token> tokenize(String filename, String raw) {
+    public static List<Token> tokenize(Filename filename, String raw) {
         return parseTokens(filename, splitTokens(filename, raw));
     }
 
-    public static Location getLoc(String filename, List<Token> tokens, int i) {
+    public static Location getLoc(Filename filename, List<Token> tokens, int i) {
         if (tokens.size() == 0 || tokens.size() == 0) return new Location(1, 1, filename);
         if (i >= tokens.size()) i = tokens.size() - 1;
         return new Location(tokens.get(i).line, tokens.get(i).start, filename);
@@ -608,49 +610,41 @@ public class Parsing {
     }
 
     public static ParseRes<String> parseIdentifier(List<Token> tokens, int i) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isIdentifier()) {
                 return ParseRes.res(tokens.get(i).identifier(), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
-            return ParseRes.failed();
-        }
+        else return ParseRes.failed();
     }
     public static ParseRes<Operator> parseOperator(List<Token> tokens, int i) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isOperator()) {
                 return ParseRes.res(tokens.get(i).operator(), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
-            return ParseRes.failed();
-        }
+        else return ParseRes.failed();
     }
 
     public static boolean isIdentifier(List<Token> tokens, int i, String lit) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isIdentifier(lit)) {
                 return true;
             }
             else return false;
         }
-        catch (IndexOutOfBoundsException e) {
-            return false;
-        }
+        else return false;
     }
     public static boolean isOperator(List<Token> tokens, int i, Operator op) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isOperator(op)) {
                 return true;
             }
             else return false;
         }
-        catch (IndexOutOfBoundsException e) {
-            return false;
-        }
+        else return false;
     }
     public static boolean isStatementEnd(List<Token> tokens, int i) {
         if (isOperator(tokens, i, Operator.SEMICOLON)) return true;
@@ -663,34 +657,29 @@ public class Parsing {
         return !reserved.contains(name);
     }
 
-    public static ParseRes<ConstantStatement> parseString(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ConstantStatement> parseString(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isString()) {
                 return ParseRes.res(new ConstantStatement(loc, tokens.get(i).string()), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
-            return ParseRes.failed();
+        else return ParseRes.failed();
     }
-    }
-    public static ParseRes<ConstantStatement> parseNumber(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ConstantStatement> parseNumber(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isNumber()) {
                 return ParseRes.res(new ConstantStatement(loc, tokens.get(i).number()), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
-            return ParseRes.failed();
+        else return ParseRes.failed();
     }
-
-    }
-    public static ParseRes<RegexStatement> parseRegex(String filename, List<Token> tokens, int i) {
+    public static ParseRes<RegexStatement> parseRegex(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isRegex()) {
                 var val = tokens.get(i).regex();
                 var index = val.lastIndexOf('/');
@@ -700,12 +689,10 @@ public class Parsing {
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
         return ParseRes.failed();
     }
-    }
 
-    public static ParseRes<ArrayStatement> parseArray(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ArrayStatement> parseArray(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.BRACKET_OPEN)) return ParseRes.failed();
@@ -744,7 +731,7 @@ public class Parsing {
         return ParseRes.res(new ArrayStatement(loc, values.toArray(Statement[]::new)), n);
     }
 
-    public static ParseRes<List<String>> parseParamList(String filename, List<Token> tokens, int i) {
+    public static ParseRes<List<String>> parseParamList(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -776,17 +763,18 @@ public class Parsing {
         return ParseRes.res(args, n);
     }
 
-    public static ParseRes<? extends Object> parsePropName(String filename, List<Token> tokens, int i) {
-        var idRes = parseIdentifier(tokens, i);
-        if (idRes.isSuccess()) return ParseRes.res(idRes.result, 1);
-        var strRes = parseString(null, tokens, i);
-        if (strRes.isSuccess()) return ParseRes.res(strRes.result.value, 1);
-        var numRes = parseNumber(null, tokens, i);
-        if (numRes.isSuccess()) return ParseRes.res(numRes.result.value, 1);
+    public static ParseRes<String> parsePropName(Filename filename, List<Token> tokens, int i) {
+        var loc = getLoc(filename, tokens, i);
 
-        return ParseRes.failed();
+        if (inBounds(tokens, i)) {
+            var token = tokens.get(i);
+
+            if (token.isNumber() || token.isIdentifier() || token.isString()) return ParseRes.res(token.rawValue, 1);
+            else return ParseRes.error(loc, "Expected identifier, string or number literal.");
         }
-    public static ParseRes<ObjProp> parseObjectProp(String filename, List<Token> tokens, int i) {
+        else return ParseRes.failed();
+    }
+    public static ParseRes<ObjProp> parseObjectProp(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -808,19 +796,21 @@ public class Parsing {
         if (!res.isSuccess()) return ParseRes.error(loc, "Expected a compound statement for property accessor.", res);
         n += res.n;
 
+        var end = getLoc(filename, tokens, i + n - 1);
+
         return ParseRes.res(new ObjProp(
             name, access,
-            new FunctionStatement(loc, access + " " + name.toString(), argsRes.result.toArray(String[]::new), res.result)
+            new FunctionStatement(loc, end, access + " " + name.toString(), argsRes.result.toArray(String[]::new), false, res.result)
         ), n);
     }
-    public static ParseRes<ObjectStatement> parseObject(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ObjectStatement> parseObject(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.BRACE_OPEN)) return ParseRes.failed();
 
-        var values = new LinkedHashMap<Object, Statement>();
-        var getters = new LinkedHashMap<Object, FunctionStatement>();
-        var setters = new LinkedHashMap<Object, FunctionStatement>();
+        var values = new LinkedHashMap<String, Statement>();
+        var getters = new LinkedHashMap<String, FunctionStatement>();
+        var setters = new LinkedHashMap<String, FunctionStatement>();
 
         if (isOperator(tokens, i + n, Operator.BRACE_CLOSE)) {
             n++;
@@ -870,7 +860,7 @@ public class Parsing {
 
         return ParseRes.res(new ObjectStatement(loc, values, getters, setters), n);
     }
-    public static ParseRes<NewStatement> parseNew(String filename, List<Token> tokens, int i) {
+    public static ParseRes<CallStatement> parseNew(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
         if (!isIdentifier(tokens, i + n++, "new")) return ParseRes.failed();
@@ -881,12 +871,12 @@ public class Parsing {
         var callRes = parseCall(filename, tokens, i + n, valRes.result, 0);
         n += callRes.n;
         if (callRes.isError()) return callRes.transform();
-        else if (callRes.isFailed()) return ParseRes.res(new NewStatement(loc, valRes.result), n);
+        else if (callRes.isFailed()) return ParseRes.res(new CallStatement(loc, true, valRes.result), n);
         var call = (CallStatement)callRes.result;
 
-        return ParseRes.res(new NewStatement(loc, call.func, call.args), n);
+        return ParseRes.res(new CallStatement(loc, true, call.func, call.args), n);
     }
-    public static ParseRes<TypeofStatement> parseTypeof(String filename, List<Token> tokens, int i) {
+    public static ParseRes<TypeofStatement> parseTypeof(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
         if (!isIdentifier(tokens, i + n++, "typeof")) return ParseRes.failed();
@@ -897,7 +887,7 @@ public class Parsing {
 
         return ParseRes.res(new TypeofStatement(loc, valRes.result), n);
     }
-    public static ParseRes<VoidStatement> parseVoid(String filename, List<Token> tokens, int i) {
+    public static ParseRes<DiscardStatement> parseVoid(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
         if (!isIdentifier(tokens, i + n++, "void")) return ParseRes.failed();
@@ -906,9 +896,9 @@ public class Parsing {
         if (!valRes.isSuccess()) return ParseRes.error(loc, "Expected a value after 'void' keyword.", valRes);
         n += valRes.n;
 
-        return ParseRes.res(new VoidStatement(loc, valRes.result), n);
+        return ParseRes.res(new DiscardStatement(loc, valRes.result), n);
     }
-    public static ParseRes<? extends Statement> parseDelete(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseDelete(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "delete")) return ParseRes.failed();
@@ -929,7 +919,7 @@ public class Parsing {
         }
     }
 
-    public static ParseRes<FunctionStatement> parseFunction(String filename, List<Token> tokens, int i, boolean statement) {
+    public static ParseRes<FunctionStatement> parseFunction(Filename filename, List<Token> tokens, int i, boolean statement) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -967,12 +957,13 @@ public class Parsing {
 
         var res = parseCompound(filename, tokens, i + n);
         n += res.n;
+        var end = getLoc(filename, tokens, i + n - 1);
 
-        if (res.isSuccess()) return ParseRes.res(new FunctionStatement(loc, name, args.toArray(String[]::new), res.result), n);
+        if (res.isSuccess()) return ParseRes.res(new FunctionStatement(loc, end, name, args.toArray(String[]::new), statement, res.result), n);
         else return ParseRes.error(loc, "Expected a compound statement for function.", res);
     }
 
-    public static ParseRes<OperationStatement> parseUnary(String filename, List<Token> tokens, int i) {
+    public static ParseRes<OperationStatement> parseUnary(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -991,9 +982,9 @@ public class Parsing {
         var res = parseValue(filename, tokens, n + i, 14);
 
         if (res.isSuccess()) return ParseRes.res(new OperationStatement(loc, operation, res.result), n + res.n);
-        else return ParseRes.error(loc, String.format("Expected a value after the unary operator '%s'.", op.value), res);
+        else return ParseRes.error(loc, String.format("Expected a value after the unary operator '%s'.", op.readable), res);
     }
-    public static ParseRes<ChangeStatement> parsePrefixChange(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ChangeStatement> parsePrefixChange(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1010,7 +1001,7 @@ public class Parsing {
         if (!(res.result instanceof AssignableStatement)) return ParseRes.error(loc, "Expected assignable value after prefix operator.");
         return ParseRes.res(new ChangeStatement(loc, (AssignableStatement)res.result, change, false), n + res.n);
     }
-    public static ParseRes<? extends Statement> parseParens(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseParens(Filename filename, List<Token> tokens, int i) {
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.PAREN_OPEN)) return ParseRes.failed();
 
@@ -1022,9 +1013,8 @@ public class Parsing {
 
         return ParseRes.res(res.result, n);
     }
-    @SuppressWarnings("all")
-    public static ParseRes<? extends Statement> parseSimple(String filename, List<Token> tokens, int i, boolean statement) {
-        var res = new ArrayList<>();
+    public static ParseRes<? extends Statement> parseSimple(Filename filename, List<Token> tokens, int i, boolean statement) {
+        var res = new ArrayList<ParseRes<? extends Statement>>();
 
         if (!statement) {
             res.add(parseObject(filename, tokens, i));
@@ -1047,10 +1037,10 @@ public class Parsing {
             parseDelete(filename, tokens, i)
         ));
 
-        return ParseRes.any(res.toArray(ParseRes[]::new));
+        return ParseRes.any(res);
     }
 
-    public static ParseRes<VariableStatement> parseVariable(String filename, List<Token> tokens, int i) {
+    public static ParseRes<VariableStatement> parseVariable(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var literal = parseIdentifier(tokens, i);
 
@@ -1058,7 +1048,6 @@ public class Parsing {
 
         if (!checkVarName(literal.result)) {
             if (literal.result.equals("await")) return ParseRes.error(loc, "'await' expressions are not supported.");
-            if (literal.result.equals("async")) return ParseRes.error(loc, "'async' is not supported.");
             if (literal.result.equals("const")) return ParseRes.error(loc, "'const' declarations are not supported.");
             if (literal.result.equals("let")) return ParseRes.error(loc, "'let' declarations are not supported.");
             return ParseRes.error(loc, String.format("Unexpected identifier '%s'.", literal.result));
@@ -1066,7 +1055,7 @@ public class Parsing {
 
         return ParseRes.res(new VariableStatement(loc, literal.result), 1);
     }
-    public static ParseRes<? extends Statement> parseLiteral(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseLiteral(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var id = parseIdentifier(tokens, i);
         if (!id.isSuccess()) return id.transform();
@@ -1078,10 +1067,10 @@ public class Parsing {
             return ParseRes.res(new ConstantStatement(loc, false), 1);
         }
         if (id.result.equals("undefined")) {
-            return ParseRes.res(new ConstantStatement(loc, null), 1);
+            return ParseRes.res(ConstantStatement.ofUndefined(loc), 1);
         }
         if (id.result.equals("null")) {
-            return ParseRes.res(new ConstantStatement(loc, Values.NULL), 1);
+            return ParseRes.res(ConstantStatement.ofNull(loc), 1);
         }
         if (id.result.equals("this")) {
             return ParseRes.res(new VariableIndexStatement(loc, 0), 1);
@@ -1094,7 +1083,7 @@ public class Parsing {
         }
         return ParseRes.failed();
     }
-    public static ParseRes<IndexStatement> parseMember(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<IndexStatement> parseMember(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1107,7 +1096,7 @@ public class Parsing {
 
         return ParseRes.res(new IndexStatement(loc, prev, new ConstantStatement(loc, literal.result)), n);
     }
-    public static ParseRes<IndexStatement> parseIndex(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<IndexStatement> parseIndex(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1123,7 +1112,7 @@ public class Parsing {
 
         return ParseRes.res(new IndexStatement(loc, prev, valRes.result), n);
     }
-    public static ParseRes<? extends Statement> parseAssign(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<? extends Statement> parseAssign(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0 ;
 
@@ -1135,10 +1124,12 @@ public class Parsing {
         var op = opRes.result;
         if (!op.isAssign()) return ParseRes.failed();
 
-        if (!(prev instanceof AssignableStatement)) return ParseRes.error(loc, "Invalid expression on left hand side of assign operator.");
+        if (!(prev instanceof AssignableStatement)) {
+            return ParseRes.error(loc, "Invalid expression on left hand side of assign operator.");
+        }
 
         var res = parseValue(filename, tokens, i + n, 2);
-        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected value after assignment operator '%s'.", op.value), res);
+        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected value after assignment operator '%s'.", op.readable), res);
         n += res.n;
 
         Operation operation = null;
@@ -1157,7 +1148,7 @@ public class Parsing {
 
         return ParseRes.res(((AssignableStatement)prev).toAssign(res.result, operation), n);
     }
-    public static ParseRes<CallStatement> parseCall(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<CallStatement> parseCall(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1175,8 +1166,7 @@ public class Parsing {
                 prevArg = true;
             }
             else if (argRes.isError()) return argRes.transform();
-            else if (isOperator(tokens, i + n, Operator.COMMA)) {
-                if (!prevArg) args.add(null);
+            else if (prevArg && isOperator(tokens, i + n, Operator.COMMA)) {
                 prevArg = false;
                 n++;
             }
@@ -1184,12 +1174,12 @@ public class Parsing {
                 n++;
                 break;
             }
-            else return ParseRes.failed();
+            else return ParseRes.error(getLoc(filename, tokens, i + n), prevArg ? "Expected a comma or a closing paren." : "Expected an expression or a closing paren.");
         }
 
-        return ParseRes.res(new CallStatement(loc, prev, args.toArray(Statement[]::new)), n);
+        return ParseRes.res(new CallStatement(loc, false, prev, args.toArray(Statement[]::new)), n);
     }
-    public static ParseRes<ChangeStatement> parsePostfixChange(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<ChangeStatement> parsePostfixChange(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1207,7 +1197,7 @@ public class Parsing {
         if (!(prev instanceof AssignableStatement)) return ParseRes.error(loc, "Expected assignable value before suffix operator.");
         return ParseRes.res(new ChangeStatement(loc, (AssignableStatement)prev, change, true), n);
     }
-    public static ParseRes<OperationStatement> parseInstanceof(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<OperationStatement> parseInstanceof(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1220,7 +1210,7 @@ public class Parsing {
 
         return ParseRes.res(new OperationStatement(loc, Operation.INSTANCEOF, prev, valRes.result), n);
     }
-    public static ParseRes<OperationStatement> parseIn(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<OperationStatement> parseIn(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1233,7 +1223,7 @@ public class Parsing {
 
         return ParseRes.res(new OperationStatement(loc, Operation.IN, prev, valRes.result), n);
     }
-    public static ParseRes<CompoundStatement> parseComma(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<CompoundStatement> parseComma(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1244,9 +1234,9 @@ public class Parsing {
         if (!res.isSuccess()) return ParseRes.error(loc, "Expected a value after the comma.", res);
         n += res.n;
 
-        return ParseRes.res(new CompoundStatement(loc, prev, res.result), n);
+        return ParseRes.res(new CompoundStatement(loc, false, prev, res.result), n);
     }
-    public static ParseRes<IfStatement> parseTernary(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<IfStatement> parseTernary(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1265,7 +1255,7 @@ public class Parsing {
 
         return ParseRes.res(new IfStatement(loc, prev, a.result, b.result), n);
     }
-    public static ParseRes<? extends Statement> parseOperator(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<? extends Statement> parseOperator(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1277,7 +1267,7 @@ public class Parsing {
         if (op.isAssign()) return parseAssign(filename, tokens, i + n - 1, prev, precedence);
 
         var res = parseValue(filename, tokens, i + n, op.precedence + (op.reverse ? 0 : 1));
-        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected a value after the '%s' operator.", op.value), res);
+        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected a value after the '%s' operator.", op.readable), res);
         n += res.n;
 
         if (op == Operator.LAZY_AND) {
@@ -1290,7 +1280,7 @@ public class Parsing {
         return ParseRes.res(new OperationStatement(loc, op.operation, prev, res.result), n);
     }
 
-    public static ParseRes<? extends Statement> parseValue(String filename, List<Token> tokens, int i, int precedence, boolean statement) {
+    public static ParseRes<? extends Statement> parseValue(Filename filename, List<Token> tokens, int i, int precedence, boolean statement) {
         Statement prev = null;
         int n = 0;
 
@@ -1331,16 +1321,15 @@ public class Parsing {
         if (prev == null) return ParseRes.failed();
         else return ParseRes.res(prev, n);
     }
-    public static ParseRes<? extends Statement> parseValue(String filename, List<Token> tokens, int i, int precedence) {
+    public static ParseRes<? extends Statement> parseValue(Filename filename, List<Token> tokens, int i, int precedence) {
         return parseValue(filename, tokens, i, precedence, false);
     }
 
-    public static ParseRes<? extends Statement> parseValueStatement(String filename, List<Token> tokens, int i) {
-        var loc = getLoc(filename, tokens, i);
+    public static ParseRes<? extends Statement> parseValueStatement(Filename filename, List<Token> tokens, int i) {
         var valRes = parseValue(filename, tokens, i, 0, true);
         if (!valRes.isSuccess()) return valRes.transform();
 
-        valRes.result.setLoc(loc);
+        // valRes.result.setLoc(loc);
         var res = ParseRes.res(valRes.result, valRes.n);
 
         if (isStatementEnd(tokens, i + res.n)) {
@@ -1352,7 +1341,7 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.", res);
     }
-    public static ParseRes<VariableDeclareStatement> parseVariableDeclare(String filename, List<Token> tokens, int i) {
+    public static ParseRes<VariableDeclareStatement> parseVariableDeclare(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "var")) return ParseRes.failed();
@@ -1365,6 +1354,7 @@ public class Parsing {
         }
 
         while (true) {
+            var nameLoc = getLoc(filename, tokens, i + n);
             var nameRes = parseIdentifier(tokens, i + n++);
             if (!nameRes.isSuccess()) return ParseRes.error(loc, "Expected a variable name.");
 
@@ -1382,7 +1372,7 @@ public class Parsing {
                 val = valRes.result;
             }
 
-            res.add(new Pair(nameRes.result, val));
+            res.add(new Pair(nameRes.result, val, nameLoc));
             
             if (isOperator(tokens, i + n, Operator.COMMA)) {
                 n++;
@@ -1396,7 +1386,7 @@ public class Parsing {
         }
     }
 
-    public static ParseRes<ReturnStatement> parseReturn(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ReturnStatement> parseReturn(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "return")) return ParseRes.failed();
@@ -1408,8 +1398,7 @@ public class Parsing {
 
         var valRes = parseValue(filename, tokens, i + n, 0);
         n += valRes.n;
-        if (valRes.isError())
-            return ParseRes.error(loc, "Expected a return value.", valRes);
+        if (valRes.isError()) return ParseRes.error(loc, "Expected a return value.", valRes);
 
         var res = ParseRes.res(new ReturnStatement(loc, valRes.result), n);
 
@@ -1420,7 +1409,7 @@ public class Parsing {
         else
             return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.", valRes);
     }
-    public static ParseRes<ThrowStatement> parseThrow(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ThrowStatement> parseThrow(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "throw")) return ParseRes.failed();
@@ -1438,7 +1427,7 @@ public class Parsing {
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.", valRes);
     }
 
-    public static ParseRes<BreakStatement> parseBreak(String filename, List<Token> tokens, int i) {
+    public static ParseRes<BreakStatement> parseBreak(Filename filename, List<Token> tokens, int i) {
         if (!isIdentifier(tokens, i, "break")) return ParseRes.failed();
 
         if (isStatementEnd(tokens, i + 1)) {
@@ -1456,7 +1445,7 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.");
     }
-    public static ParseRes<ContinueStatement> parseContinue(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ContinueStatement> parseContinue(Filename filename, List<Token> tokens, int i) {
         if (!isIdentifier(tokens, i, "continue")) return ParseRes.failed();
 
         if (isStatementEnd(tokens, i + 1)) {
@@ -1474,8 +1463,8 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.");
     }
-    public static ParseRes<DebugStatement> parseDebug(String filename, List<Token> tokens, int i) {
-        if (!isIdentifier(tokens, i, "debug")) return ParseRes.failed();
+    public static ParseRes<DebugStatement> parseDebug(Filename filename, List<Token> tokens, int i) {
+        if (!isIdentifier(tokens, i, "debugger")) return ParseRes.failed();
 
         if (isStatementEnd(tokens, i + 1)) {
             if (isOperator(tokens, i + 1, Operator.SEMICOLON)) return ParseRes.res(new DebugStatement(getLoc(filename, tokens, i)), 2);
@@ -1484,7 +1473,7 @@ public class Parsing {
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.");
     }
 
-    public static ParseRes<CompoundStatement> parseCompound(String filename, List<Token> tokens, int i) {
+    public static ParseRes<CompoundStatement> parseCompound(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.BRACE_OPEN)) return ParseRes.failed();
@@ -1510,7 +1499,7 @@ public class Parsing {
             statements.add(res.result);
         }
 
-        return ParseRes.res(new CompoundStatement(loc, statements.toArray(Statement[]::new)), n);
+        return ParseRes.res(new CompoundStatement(loc, true, statements.toArray(Statement[]::new)).setEnd(getLoc(filename, tokens, i + n - 1)), n);
     }
     public static ParseRes<String> parseLabel(List<Token> tokens, int i) {
         int n = 0;
@@ -1520,7 +1509,7 @@ public class Parsing {
 
         return ParseRes.res(nameRes.result, n);
     }
-    public static ParseRes<IfStatement> parseIf(String filename, List<Token> tokens, int i) {
+    public static ParseRes<IfStatement> parseIf(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1531,8 +1520,7 @@ public class Parsing {
         if (!condRes.isSuccess()) return ParseRes.error(loc, "Expected an if condition.", condRes);
         n += condRes.n;
 
-        if (!isOperator(tokens, i + n++, Operator.PAREN_CLOSE))
-            return ParseRes.error(loc, "Expected a closing paren after if condition.");
+        if (!isOperator(tokens, i + n++, Operator.PAREN_CLOSE)) return ParseRes.error(loc, "Expected a closing paren after if condition.");
 
         var res = parseStatement(filename, tokens, i + n);
         if (!res.isSuccess()) return ParseRes.error(loc, "Expected an if body.", res);
@@ -1547,7 +1535,7 @@ public class Parsing {
     
         return ParseRes.res(new IfStatement(loc, condRes.result, res.result, elseRes.result), n);
     }
-    public static ParseRes<WhileStatement> parseWhile(String filename, List<Token> tokens, int i) {
+    public static ParseRes<WhileStatement> parseWhile(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1569,7 +1557,7 @@ public class Parsing {
 
         return ParseRes.res(new WhileStatement(loc, labelRes.result, condRes.result, res.result), n);
     }
-    public static ParseRes<Statement> parseSwitchCase(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Statement> parseSwitchCase(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1589,7 +1577,7 @@ public class Parsing {
 
         return ParseRes.res(null, 2);
     }
-    public static ParseRes<SwitchStatement> parseSwitch(String filename, List<Token> tokens, int i) {
+    public static ParseRes<SwitchStatement> parseSwitch(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1649,7 +1637,7 @@ public class Parsing {
             statements.toArray(Statement[]::new)
         ), n);
     }
-    public static ParseRes<DoWhileStatement> parseDoWhile(String filename, List<Token> tokens, int i) {
+    public static ParseRes<DoWhileStatement> parseDoWhile(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1678,7 +1666,7 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected a semicolon.");
     }
-    public static ParseRes<Statement> parseFor(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Statement> parseFor(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1692,15 +1680,14 @@ public class Parsing {
 
         if (isOperator(tokens, i + n, Operator.SEMICOLON)) {
             n++;
-            decl = new CompoundStatement(loc);
+            decl = new CompoundStatement(loc, false);
         }
         else {
             var declRes = ParseRes.any(
                 parseVariableDeclare(filename, tokens, i + n),
                 parseValueStatement(filename, tokens, i + n)
             );
-            if (!declRes.isSuccess())
-                return ParseRes.error(loc, "Expected a declaration or an expression.", declRes);
+            if (!declRes.isSuccess()) return ParseRes.error(loc, "Expected a declaration or an expression.", declRes);
             n += declRes.n;
             decl = declRes.result;
         }
@@ -1719,7 +1706,7 @@ public class Parsing {
 
         if (isOperator(tokens, i + n, Operator.PAREN_CLOSE)) {
             n++;
-            inc = new CompoundStatement(loc);
+            inc = new CompoundStatement(loc, false);
         }
         else {
             var incRes = parseValue(filename, tokens, i + n, 0);
@@ -1736,7 +1723,7 @@ public class Parsing {
 
         return ParseRes.res(new ForStatement(loc, labelRes.result, decl, cond, inc, res.result), n);
     }
-    public static ParseRes<ForInStatement> parseForIn(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ForInStatement> parseForIn(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1754,6 +1741,7 @@ public class Parsing {
 
         var nameRes = parseIdentifier(tokens, i + n);
         if (!nameRes.isSuccess()) return ParseRes.error(loc, "Expected a variable name for 'for' loop.");
+        var nameLoc = getLoc(filename, tokens, i + n);
         n += nameRes.n;
 
         Statement varVal = null;
@@ -1787,9 +1775,49 @@ public class Parsing {
         if (!bodyRes.isSuccess()) return ParseRes.error(loc, "Expected a for body.", bodyRes);
         n += bodyRes.n;
 
-        return ParseRes.res(new ForInStatement(loc, labelRes.result, isDecl, nameRes.result, varVal, objRes.result, bodyRes.result), n);
+        return ParseRes.res(new ForInStatement(loc, nameLoc, labelRes.result, isDecl, nameRes.result, varVal, objRes.result, bodyRes.result), n);
     }
-    public static ParseRes<TryStatement> parseCatch(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ForOfStatement> parseForOf(Filename filename, List<Token> tokens, int i) {
+        var loc = getLoc(filename, tokens, i);
+        int n = 0;
+
+        var labelRes = parseLabel(tokens, i + n);
+        var isDecl = false;
+        n += labelRes.n;
+
+        if (!isIdentifier(tokens, i + n++, "for")) return ParseRes.failed();
+        if (!isOperator(tokens, i + n++, Operator.PAREN_OPEN)) return ParseRes.error(loc, "Expected a open paren after 'for'.");
+
+        if (isIdentifier(tokens, i + n, "var")) {
+            isDecl = true;
+            n++;
+        }
+
+        var nameRes = parseIdentifier(tokens, i + n);
+        if (!nameRes.isSuccess()) return ParseRes.error(loc, "Expected a variable name for 'for' loop.");
+        var nameLoc = getLoc(filename, tokens, i + n);
+        n += nameRes.n;
+
+        if (!isIdentifier(tokens, i + n++, "of")) {
+            if (nameRes.result.equals("const")) return ParseRes.error(loc, "'const' declarations are not supported.");
+            else if (nameRes.result.equals("let")) return ParseRes.error(loc, "'let' declarations are not supported.");
+            else return ParseRes.error(loc, "Expected 'of' keyword after variable declaration.");
+        }
+
+        var objRes = parseValue(filename, tokens, i + n, 0);
+        if (!objRes.isSuccess()) return ParseRes.error(loc, "Expected a value.", objRes);
+        n += objRes.n;
+
+        if (!isOperator(tokens, i + n++, Operator.PAREN_CLOSE)) return ParseRes.error(loc, "Expected a closing paren after for.");
+
+
+        var bodyRes = parseStatement(filename, tokens, i + n);
+        if (!bodyRes.isSuccess()) return ParseRes.error(loc, "Expected a for body.", bodyRes);
+        n += bodyRes.n;
+
+        return ParseRes.res(new ForOfStatement(loc, nameLoc, labelRes.result, isDecl, nameRes.result, objRes.result, bodyRes.result), n);
+    }
+    public static ParseRes<TryStatement> parseCatch(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1830,8 +1858,8 @@ public class Parsing {
         return ParseRes.res(new TryStatement(loc, res.result, catchBody, finallyBody, name), n);
     }
 
-    public static ParseRes<? extends Statement> parseStatement(String filename, List<Token> tokens, int i) {
-        if (isOperator(tokens, i, Operator.SEMICOLON)) return ParseRes.res(new CompoundStatement(getLoc(filename, tokens, i)), 1);
+    public static ParseRes<? extends Statement> parseStatement(Filename filename, List<Token> tokens, int i) {
+        if (isOperator(tokens, i, Operator.SEMICOLON)) return ParseRes.res(new CompoundStatement(getLoc(filename, tokens, i), false), 1);
         if (isIdentifier(tokens, i, "with")) return ParseRes.error(getLoc(filename, tokens, i), "'with' statements are not allowed.");
         return ParseRes.any(
             parseVariableDeclare(filename, tokens, i),
@@ -1845,6 +1873,7 @@ public class Parsing {
             parseSwitch(filename, tokens, i),
             parseFor(filename, tokens, i),
             parseForIn(filename, tokens, i),
+            parseForOf(filename, tokens, i),
             parseDoWhile(filename, tokens, i),
             parseCatch(filename, tokens, i),
             parseCompound(filename, tokens, i),
@@ -1853,7 +1882,7 @@ public class Parsing {
         );
     }
 
-    public static Statement[] parse(String filename, String raw) {
+    public static Statement[] parse(Filename filename, String raw) {
         var tokens = tokenize(filename, raw);
         var list = new ArrayList<Statement>();
         int i = 0;
@@ -1874,41 +1903,31 @@ public class Parsing {
         return list.toArray(Statement[]::new);
     }
 
-    public static CodeFunction compile(HashMap<Long, Instruction[]> funcs, Environment environment, Statement ...statements) {
-        var target = environment.global.globalChild();
-        var subscope = target.child();
-        var res = new CompileTarget(funcs);
-        var body = new CompoundStatement(null, statements);
-        if (body instanceof CompoundStatement) body = (CompoundStatement)body;
-        else body = new CompoundStatement(null, new Statement[] { body });
+    public static CompileResult compile(Statement ...statements) {
+        var target = new CompileResult(new LocalScopeRecord());
+        var stm = new CompoundStatement(null, true, statements);
 
-        subscope.define("this");
-        subscope.define("arguments");
-
-        body.declare(target);
+        target.scope.define("this");
+        target.scope.define("arguments");
 
         try {
-            body.compile(res, subscope, true);
-            FunctionStatement.checkBreakAndCont(res, 0);
+            stm.compile(target, true);
+            FunctionStatement.checkBreakAndCont(target, 0);
         }
         catch (SyntaxException e) {
-            res.target.clear();
-            res.add(Instruction.throwSyntax(e));
+            target = new CompileResult(new LocalScopeRecord());
+
+            target.scope.define("this");
+            target.scope.define("arguments");
+
+            target.add(Instruction.throwSyntax(e)).setLocation(stm.loc());
         }
 
-        if (res.size() != 0 && res.get(res.size() - 1).type == Type.DISCARD) {
-            res.set(res.size() - 1, Instruction.ret());
-        }
-        else res.add(Instruction.ret());
+        target.add(Instruction.ret()).setLocation(stm.loc());
 
-        return new CodeFunction(environment, "", subscope.localsCount(), 0, new ValueVariable[0], res.array());
-    }
-    public static CodeFunction compile(HashMap<Long, Instruction[]> funcs, Environment environment, String filename, String raw) {
-        try {
-            return compile(funcs, environment, parse(filename, raw));
-        }
-        catch (SyntaxException e) {
-            return new CodeFunction(environment, null, 2, 0, new ValueVariable[0], new Instruction[] { Instruction.throwSyntax(e) });
+        return target;
     }
+    public static CompileResult compile(Filename filename, String raw) {
+        return compile(parse(filename, raw));
     }
 }

src/java/me/topchetoeu/jscript/compilation/parsing/RawToken.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 public class RawToken {
     public final String value;

src/java/me/topchetoeu/jscript/compilation/parsing/TestRes.java

@@ -1,7 +1,7 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.parsing.ParseRes.State;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.parsing.ParseRes.State;
 
 public class TestRes {
     public final State state;

src/java/me/topchetoeu/jscript/compilation/parsing/Token.java

@@ -1,21 +1,24 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 public class Token {
     public final Object value;
+    public final String rawValue;
     public final boolean isString;
     public final boolean isRegex;
     public final int line;
     public final int start;
 
-    private Token(int line, int start, Object value, boolean isString, boolean isRegex) {
+    private Token(int line, int start, Object value, String rawValue, boolean isString, boolean isRegex) {
         this.value = value;
+        this.rawValue = rawValue;
         this.line = line;
         this.start = start;
         this.isString = isString;
         this.isRegex = isRegex;
     }
-    private Token(int line, int start, Object value) {
+    private Token(int line, int start, Object value, String rawValue) {
         this.value = value;
+        this.rawValue = rawValue;
         this.line = line;
         this.start = start;
         this.isString = false;
@@ -37,19 +40,19 @@ public class Token {
     public String identifier() { return (String)value; }
     public Operator operator() { return (Operator)value; }
 
-    public static Token regex(int line, int start, String val) {
-        return new Token(line, start, val, false, true);
+    public static Token regex(int line, int start, String val, String rawValue) {
+        return new Token(line, start, val, rawValue, false, true);
     }
-    public static Token string(int line, int start, String val) {
-        return new Token(line, start, val, true, false);
+    public static Token string(int line, int start, String val, String rawValue) {
+        return new Token(line, start, val, rawValue, true, false);
     }
-    public static Token number(int line, int start, double val) {
-        return new Token(line, start, val);
+    public static Token number(int line, int start, double val, String rawValue) {
+        return new Token(line, start, val, rawValue);
     }
     public static Token identifier(int line, int start, String val) {
-        return new Token(line, start, val);
+        return new Token(line, start, val, val);
     }
     public static Token operator(int line, int start, Operator val) {
-        return new Token(line, start, val);
+        return new Token(line, start, val, val.readable);
     }
 }

src/java/me/topchetoeu/jscript/compilation/parsing/TokenType.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 enum TokenType {
     REGEX,

src/java/me/topchetoeu/jscript/compilation/scope/LocalScopeRecord.java

@@ -1,25 +1,22 @@
-package me.topchetoeu.jscript.engine.scope;
+package me.topchetoeu.jscript.compilation.scope;
 
 import java.util.ArrayList;
 
-import me.topchetoeu.jscript.engine.Context;
-
 public class LocalScopeRecord implements ScopeRecord {
     public final LocalScopeRecord parent;
-    public final GlobalScope global;
 
     private final ArrayList<String> captures = new ArrayList<>();
     private final ArrayList<String> locals = new ArrayList<>();
 
+    public String[] captures() {
+        return captures.toArray(String[]::new);
+    }
     public String[] locals() {
         return locals.toArray(String[]::new);
     }
 
-    @Override
-    public LocalScopeRecord parent() { return parent; }
-
     public LocalScopeRecord child() {
-        return new LocalScopeRecord(this, global);
+        return new LocalScopeRecord(this);
     }
 
     public int localsCount() {
@@ -59,12 +56,6 @@ public class LocalScopeRecord implements ScopeRecord {
 
         return name;
     }
-    public boolean has(Context ctx, String name) throws InterruptedException {
-        return
-            global.has(ctx, name) ||
-            locals.contains(name) ||
-            parent != null && parent.has(ctx, name);
-    }
     public Object define(String name, boolean force) {
         if (!force && locals.contains(name)) return locals.indexOf(name);
         locals.add(name);
@@ -77,12 +68,10 @@ public class LocalScopeRecord implements ScopeRecord {
         locals.remove(locals.size() - 1);
     }
 
-    public LocalScopeRecord(GlobalScope global) {
+    public LocalScopeRecord() {
         this.parent = null;
-        this.global = global;
     }
-    public LocalScopeRecord(LocalScopeRecord parent, GlobalScope global) {
+    public LocalScopeRecord(LocalScopeRecord parent) {
         this.parent = parent;
-        this.global = global;
     }
 }

src/java/me/topchetoeu/jscript/compilation/scope/ScopeRecord.java

@@ -1,8 +1,7 @@
-package me.topchetoeu.jscript.engine.scope;
+package me.topchetoeu.jscript.compilation.scope;
 
 public interface ScopeRecord {
     public Object getKey(String name);
     public Object define(String name);
-    public ScopeRecord parent();
     public LocalScopeRecord child();
 }

src/java/me/topchetoeu/jscript/compilation/values/ArrayStatement.java

@@ -0,0 +1,40 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ArrayStatement extends Statement {
+    public final Statement[] statements;
+
+    @Override public boolean pure() {
+        for (var stm : statements) {
+            if (!stm.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.loadArr(statements.length));
+
+        for (var i = 0; i < statements.length; i++) {
+            var el = statements[i];
+            if (el != null) {
+                target.add(Instruction.dup());
+                target.add(Instruction.pushValue(i));
+                el.compile(target, true);
+                target.add(Instruction.storeMember());
+            }
+        }
+
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public ArrayStatement(Location loc, Statement[] statements) {
+        super(loc);
+        this.statements = statements;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/CallStatement.java

@@ -0,0 +1,43 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class CallStatement extends Statement {
+    public final Statement func;
+    public final Statement[] args;
+    public final boolean isNew;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+        if (isNew) func.compile(target, true);
+        else if (func instanceof IndexStatement) {
+            ((IndexStatement)func).compile(target, true, true);
+        }
+        else {
+            target.add(Instruction.pushUndefined());
+            func.compile(target, true);
+        }
+
+        for (var arg : args) arg.compile(target, true);
+
+        if (isNew) target.add(Instruction.callNew(args.length)).setLocationAndDebug(loc(), type);
+        else target.add(Instruction.call(args.length)).setLocationAndDebug(loc(), type);
+
+        if (!pollute) target.add(Instruction.discard());
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, BreakpointType.STEP_IN);
+    }
+
+    public CallStatement(Location loc, boolean isNew, Statement func, Statement ...args) {
+        super(loc);
+        this.isNew = isNew;
+        this.func = func;
+        this.args = args;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/ChangeStatement.java

@@ -1,12 +1,11 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
-import me.topchetoeu.jscript.compilation.CompileTarget;
-import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.compilation.CompileResult;
 import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.engine.Operation;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class ChangeStatement extends Statement {
     public final AssignableStatement value;
@@ -14,9 +13,13 @@ public class ChangeStatement extends Statement {
     public final boolean postfix;
 
     @Override
-    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
-        value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, scope, postfix);
-        if (!pollute) target.add(Instruction.discard().locate(loc()));
+    public void compile(CompileResult target, boolean pollute) {
+        value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, true);
+        if (!pollute) target.add(Instruction.discard());
+        else if (postfix) {
+            target.add(Instruction.pushValue(addAmount));
+            target.add(Instruction.operation(Operation.SUBTRACT));
+        }
     }
 
     public ChangeStatement(Location loc, AssignableStatement value, double addAmount, boolean postfix) {

src/java/me/topchetoeu/jscript/compilation/values/ConstantStatement.java

@@ -0,0 +1,47 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ConstantStatement extends Statement {
+    public final Object value;
+    public final boolean isNull;
+
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (pollute) {
+            if (isNull) target.add(Instruction.pushNull());
+            else if (value instanceof Double) target.add(Instruction.pushValue((Double)value));
+            else if (value instanceof String) target.add(Instruction.pushValue((String)value));
+            else if (value instanceof Boolean) target.add(Instruction.pushValue((Boolean)value));
+            else target.add(Instruction.pushUndefined());
+        }
+    }
+
+    private ConstantStatement(Location loc, Object val, boolean isNull) {
+        super(loc);
+        this.value = val;
+        this.isNull = isNull;
+    }
+
+    public ConstantStatement(Location loc, boolean val) {
+        this(loc, val, false);
+    }
+    public ConstantStatement(Location loc, String val) {
+        this(loc, val, false);
+    }
+    public ConstantStatement(Location loc, double val) {
+        this(loc, val, false);
+    }
+
+    public static ConstantStatement ofUndefined(Location loc) {
+        return new ConstantStatement(loc, null, false);
+    }
+    public static ConstantStatement ofNull(Location loc) {
+        return new ConstantStatement(loc, null, true);
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/DiscardStatement.java

@@ -0,0 +1,23 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DiscardStatement extends Statement {
+    public final Statement value;
+
+    @Override public boolean pure() { return value.pure(); }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        value.compile(target, false);
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public DiscardStatement(Location loc, Statement val) {
+        super(loc);
+        this.value = val;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/FunctionStatement.java

@@ -0,0 +1,127 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.Instruction.Type;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.CompoundStatement;
+import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+
+public class FunctionStatement extends Statement {
+    public final CompoundStatement body;
+    public final String varName;
+    public final String[] args;
+    public final boolean statement;
+    public final Location end;
+
+    @Override public boolean pure() { return varName == null && statement; }
+
+    @Override
+    public void declare(CompileResult target) {
+        if (varName != null && statement) target.scope.define(varName);
+    }
+
+    public static void checkBreakAndCont(CompileResult target, int start) {
+        for (int i = start; i < target.size(); i++) {
+            if (target.get(i).type == Type.NOP) {
+                if (target.get(i).is(0, "break") ) {
+                    throw new SyntaxException(target.map.toLocation(i), "Break was placed outside a loop.");
+                }
+                if (target.get(i).is(0, "cont")) {
+                    throw new SyntaxException(target.map.toLocation(i), "Continue was placed outside a loop.");
+                }
+            }
+        }
+    }
+
+    private CompileResult compileBody(CompileResult target, boolean pollute, BreakpointType bp) {
+        for (var i = 0; i < args.length; i++) {
+            for (var j = 0; j < i; j++) {
+                if (args[i].equals(args[j])) {
+                    throw new SyntaxException(loc(), "Duplicate parameter '" + args[i] + "'.");
+                }
+            }
+        }
+
+        var subtarget = new CompileResult(target.scope.child());
+
+        subtarget.scope.define("this");
+        var argsVar = subtarget.scope.define("arguments");
+
+        if (args.length > 0) {
+            for (var i = 0; i < args.length; i++) {
+                subtarget.add(Instruction.loadVar(argsVar));
+                subtarget.add(Instruction.pushValue(i));
+                subtarget.add(Instruction.loadMember());
+                subtarget.add(Instruction.storeVar(subtarget.scope.define(args[i])));
+            }
+        }
+
+        if (!statement && this.varName != null) {
+            subtarget.add(Instruction.storeSelfFunc((int)subtarget.scope.define(this.varName))).setLocationAndDebug(loc(), bp);
+        }
+
+        body.declare(subtarget);
+        body.compile(subtarget, false);
+        subtarget.length = args.length;
+        subtarget.add(Instruction.ret()).setLocation(end);
+        checkBreakAndCont(subtarget, 0);
+
+        if (pollute) target.add(Instruction.loadFunc(target.children.size(), subtarget.scope.getCaptures()));
+        return target.addChild(subtarget);
+    }
+
+    public void compile(CompileResult target, boolean pollute, String name, BreakpointType bp) {
+        if (this.varName != null) name = this.varName;
+
+        var hasVar = this.varName != null && statement;
+        var hasName = name != null;
+
+        compileBody(target, pollute || hasVar || hasName, bp);
+
+        if (hasName) {
+            if (pollute || hasVar) target.add(Instruction.dup());
+            target.add(Instruction.pushValue("name"));
+            target.add(Instruction.pushValue(name));
+            target.add(Instruction.storeMember());
+        }
+
+        if (hasVar) {
+            var key = target.scope.getKey(this.varName);
+
+            if (key instanceof String) target.add(Instruction.makeVar((String)key));
+            target.add(Instruction.storeVar(target.scope.getKey(this.varName), false));
+        }
+    }
+    public void compile(CompileResult target, boolean pollute, String name) {
+        compile(target, pollute, name, BreakpointType.NONE);
+    }
+    @Override public void compile(CompileResult target, boolean pollute, BreakpointType bp) {
+        compile(target, pollute, (String)null, bp);
+    }
+    @Override public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, (String)null, BreakpointType.NONE);
+    }
+
+    public FunctionStatement(Location loc, Location end, String varName, String[] args, boolean statement, CompoundStatement body) {
+        super(loc);
+
+        this.end = end;
+        this.varName = varName;
+        this.statement = statement;
+
+        this.args = args;
+        this.body = body;
+    }
+
+    public static void compileWithName(Statement stm, CompileResult target, boolean pollute, String name) {
+        if (stm instanceof FunctionStatement) ((FunctionStatement)stm).compile(target, pollute, name);
+        else stm.compile(target, pollute);
+    }
+    public static void compileWithName(Statement stm, CompileResult target, boolean pollute, String name, BreakpointType bp) {
+        if (stm instanceof FunctionStatement) ((FunctionStatement)stm).compile(target, pollute, name, bp);
+        else stm.compile(target, pollute, bp);
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/GlobalThisStatement.java

@@ -0,0 +1,19 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class GlobalThisStatement extends Statement {
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (pollute) target.add(Instruction.loadGlob());
+    }
+
+    public GlobalThisStatement(Location loc) {
+        super(loc);
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/IndexAssignStatement.java

@@ -0,0 +1,45 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class IndexAssignStatement extends Statement {
+    public final Statement object;
+    public final Statement index;
+    public final Statement value;
+    public final Operation operation;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (operation != null) {
+            object.compile(target, true);
+            index.compile(target, true);
+            target.add(Instruction.dup(2));
+
+            target.add(Instruction.loadMember());
+            value.compile(target, true);
+            target.add(Instruction.operation(operation));
+
+            target.add(Instruction.storeMember(pollute)).setLocationAndDebug(loc(), BreakpointType.STEP_IN);
+        }
+        else {
+            object.compile(target, true);
+            index.compile(target, true);
+            value.compile(target, true);
+
+            target.add(Instruction.storeMember(pollute)).setLocationAndDebug(loc(), BreakpointType.STEP_IN);;
+        }
+    }
+
+    public IndexAssignStatement(Location loc, Statement object, Statement index, Statement value, Operation operation) {
+        super(loc);
+        this.object = object;
+        this.index = index;
+        this.value = value;
+        this.operation = operation;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/IndexStatement.java

@@ -0,0 +1,37 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class IndexStatement extends AssignableStatement {
+    public final Statement object;
+    public final Statement index;
+
+    @Override
+    public Statement toAssign(Statement val, Operation operation) {
+        return new IndexAssignStatement(loc(), object, index, val, operation);
+    }
+    public void compile(CompileResult target, boolean dupObj, boolean pollute) {
+        object.compile(target, true);
+        if (dupObj) target.add(Instruction.dup());
+
+        index.compile(target, true);
+        target.add(Instruction.loadMember()).setLocationAndDebug(loc(), BreakpointType.STEP_IN);
+        if (!pollute) target.add(Instruction.discard());
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        compile(target, false, pollute);
+    }
+
+    public IndexStatement(Location loc, Statement object, Statement index) {
+        super(loc);
+        this.object = object;
+        this.index = index;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/LazyAndStatement.java

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class LazyAndStatement extends Statement {
+    public final Statement first, second;
+
+    @Override public boolean pure() { return first.pure() && second.pure(); }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        first.compile(target, true);
+        if (pollute) target.add(Instruction.dup());
+        int start = target.temp();
+        if (pollute) target.add(Instruction.discard());
+        second.compile(target, pollute);
+        target.set(start, Instruction.jmpIfNot(target.size() - start));
+    }
+
+    public LazyAndStatement(Location loc, Statement first, Statement second) {
+        super(loc);
+        this.first = first;
+        this.second = second;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/LazyOrStatement.java

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class LazyOrStatement extends Statement {
+    public final Statement first, second;
+
+    @Override public boolean pure() { return first.pure() && second.pure(); }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        first.compile(target, true);
+        if (pollute) target.add(Instruction.dup());
+        int start = target.temp();
+        if (pollute) target.add(Instruction.discard());
+        second.compile(target, pollute);
+        target.set(start, Instruction.jmpIf(target.size() - start));
+    }
+
+    public LazyOrStatement(Location loc, Statement first, Statement second) {
+        super(loc);
+        this.first = first;
+        this.second = second;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/ObjectStatement.java

@@ -0,0 +1,61 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import java.util.ArrayList;
+import java.util.Map;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ObjectStatement extends Statement {
+    public final Map<String, Statement> map;
+    public final Map<String, FunctionStatement> getters;
+    public final Map<String, FunctionStatement> setters;
+
+    @Override public boolean pure() {
+        for (var el : map.values()) {
+            if (!el.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.loadObj());
+
+        for (var el : map.entrySet()) {
+            target.add(Instruction.dup());
+            target.add(Instruction.pushValue(el.getKey()));
+            var val = el.getValue();
+            FunctionStatement.compileWithName(val, target, true, el.getKey().toString());
+            target.add(Instruction.storeMember());
+        }
+
+        var keys = new ArrayList<Object>();
+        keys.addAll(getters.keySet());
+        keys.addAll(setters.keySet());
+
+        for (var key : keys) {
+            target.add(Instruction.pushValue((String)key));
+
+            if (getters.containsKey(key)) getters.get(key).compile(target, true);
+            else target.add(Instruction.pushUndefined());
+
+            if (setters.containsKey(key)) setters.get(key).compile(target, true);
+            else target.add(Instruction.pushUndefined());
+
+            target.add(Instruction.defProp());
+        }
+
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public ObjectStatement(Location loc, Map<String, Statement> map, Map<String, FunctionStatement> getters, Map<String, FunctionStatement> setters) {
+        super(loc);
+        this.map = map;
+        this.getters = getters;
+        this.setters = setters;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/OperationStatement.java

@@ -0,0 +1,36 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class OperationStatement extends Statement {
+    public final Statement[] args;
+    public final Operation operation;
+
+    @Override public boolean pure() {
+        for (var el : args) {
+            if (!el.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        for (var arg : args) {
+            arg.compile(target, true);
+        }
+
+        if (pollute) target.add(Instruction.operation(operation));
+        else target.add(Instruction.discard());
+    }
+
+    public OperationStatement(Location loc, Operation operation, Statement ...args) {
+        super(loc);
+        this.operation = operation;
+        this.args = args;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/RegexStatement.java

@@ -0,0 +1,25 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class RegexStatement extends Statement {
+    public final String pattern, flags;
+
+    // Not really pure, since a function is called, but can be ignored.
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.loadRegex(pattern, flags));
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public RegexStatement(Location loc, String pattern, String flags) {
+        super(loc);
+        this.pattern = pattern;
+        this.flags = flags;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/TypeofStatement.java

@@ -0,0 +1,32 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class TypeofStatement extends Statement {
+    public final Statement value;
+
+    // Not really pure, since a variable from the global scope could be accessed,
+    // which could lead to code execution, that would get omitted
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (value instanceof VariableStatement) {
+            var i = target.scope.getKey(((VariableStatement)value).name);
+            if (i instanceof String) {
+                target.add(Instruction.typeof((String)i));
+                return;
+            }
+        }
+        value.compile(target, pollute);
+        target.add(Instruction.typeof());
+    }
+
+    public TypeofStatement(Location loc, Statement value) {
+        super(loc);
+        this.value = value;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/VariableAssignStatement.java

@@ -0,0 +1,37 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class VariableAssignStatement extends Statement {
+    public final String name;
+    public final Statement value;
+    public final Operation operation;
+
+    @Override public boolean pure() { return false; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var i = target.scope.getKey(name);
+        if (operation != null) {
+            target.add(Instruction.loadVar(i));
+            FunctionStatement.compileWithName(value, target, true, name);
+            target.add(Instruction.operation(operation));
+            target.add(Instruction.storeVar(i, pollute));
+        }
+        else {
+            FunctionStatement.compileWithName(value, target, true, name);
+            target.add(Instruction.storeVar(i, pollute));
+        }
+    }
+
+    public VariableAssignStatement(Location loc, String name, Statement val, Operation operation) {
+        super(loc);
+        this.name = name;
+        this.value = val;
+        this.operation = operation;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/VariableIndexStatement.java

@@ -0,0 +1,22 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class VariableIndexStatement extends Statement {
+    public final int index;
+
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (pollute) target.add(Instruction.loadVar(index));
+    }
+
+    public VariableIndexStatement(Location loc, int i) {
+        super(loc);
+        this.index = i;
+    }
+}

src/java/me/topchetoeu/jscript/compilation/values/VariableStatement.java

@@ -0,0 +1,31 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class VariableStatement extends AssignableStatement {
+    public final String name;
+
+    @Override public boolean pure() { return false; }
+
+    @Override
+    public Statement toAssign(Statement val, Operation operation) {
+        return new VariableAssignStatement(loc(), name, val, operation);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var i = target.scope.getKey(name);
+        target.add(Instruction.loadVar(i));
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public VariableStatement(Location loc, String name) {
+        super(loc);
+        this.name = name;
+    }
+}

src/java/me/topchetoeu/jscript/lib/ArrayLib.java

@@ -0,0 +1,456 @@
+package me.topchetoeu.jscript.lib;
+
+import java.util.Iterator;
+import java.util.Stack;
+
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.ExposeType;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Array")
+public class ArrayLib {
+    private static int normalizeI(int len, int i, boolean clamp) {
+        if (i < 0) i += len;
+        if (clamp) {
+            if (i < 0) i = 0;
+            if (i > len) i = len;
+        }
+        return i;
+    }
+
+    @Expose(value = "length", type = ExposeType.GETTER)
+    public static int __getLength(Arguments args) {
+        return args.self(ArrayValue.class).size();
+    }
+    @Expose(value = "length", type = ExposeType.SETTER)
+    public static void __setLength(Arguments args) {
+        args.self(ArrayValue.class).setSize(args.getInt(0));
+    }
+
+    @Expose public static ObjectValue __values(Arguments args) {
+        return __iterator(args);
+    }
+    @Expose public static ObjectValue __keys(Arguments args) {
+        return Values.toJSIterator(args.ctx, () -> new Iterator<Object>() {
+            private int i = 0;
+
+            @Override
+            public boolean hasNext() {
+                return i < args.self(ArrayValue.class).size();
+            }
+            @Override
+            public Object next() {
+                if (!hasNext()) return null;
+                return i++;
+            }
+        });
+    }
+    @Expose public static ObjectValue __entries(Arguments args) {
+        return Values.toJSIterator(args.ctx, () -> new Iterator<Object>() {
+            private int i = 0;
+
+            @Override
+            public boolean hasNext() {
+                return i < args.self(ArrayValue.class).size();
+            }
+            @Override
+            public Object next() {
+                if (!hasNext()) return null;
+                return new ArrayValue(args.ctx, i, args.self(ArrayValue.class).get(i++));
+            }
+        });
+    }
+
+    @Expose(value = "@@Symbol.iterator")
+    public static ObjectValue __iterator(Arguments args) {
+        return Values.toJSIterator(args.ctx, args.self(ArrayValue.class));
+    }
+    @Expose(value = "@@Symbol.asyncIterator")
+    public static ObjectValue __asyncIterator(Arguments args) {
+        return Values.toJSAsyncIterator(args.ctx, args.self(ArrayValue.class).iterator());
+    }
+
+    @Expose public static ArrayValue __concat(Arguments args) {
+        // TODO: Fully implement with non-array spreadable objects
+        var arrs = args.slice(-1);
+        var size = 0;
+
+        for (int i = 0; i < arrs.n(); i++) {
+            if (arrs.get(i) instanceof ArrayValue) size += arrs.convert(i, ArrayValue.class).size();
+            else i++;
+        }
+
+        var res = new ArrayValue(size);
+
+        for (int i = 0, j = 0; i < arrs.n(); i++) {
+            if (arrs.get(i) instanceof ArrayValue) {
+                var arrEl = arrs.convert(i, ArrayValue.class);
+                int n = arrEl.size();
+                arrEl.copyTo(res, 0, j, n);
+                j += n;
+            }
+            else {
+                res.set(args.ctx, j++, arrs.get(i));
+            }
+        }
+
+        return res;
+    }
+    @Expose public static ArrayValue __sort(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var cmp = args.convert(0, FunctionValue.class);
+
+        var defaultCmp = new NativeFunction("", _args -> {
+            return _args.getString(0).compareTo(_args.getString(1));
+        });
+
+        arr.sort((a, b) -> {
+            var res = Values.toNumber(args.ctx, (cmp == null ? defaultCmp : cmp).call(args.ctx, null, a, b));
+            if (res < 0) return -1;
+            if (res > 0) return 1;
+            return 0;
+        });
+        return arr;
+    }
+
+    @Expose public static ArrayValue __fill(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var val = args.get(0);
+        var start = normalizeI(arr.size(), args.getInt(1, 0), true);
+        var end = normalizeI(arr.size(), args.getInt(2, arr.size()), true);
+
+        for (; start < end; start++) arr.set(args.ctx, start, val);
+
+        return arr;
+    }
+    @Expose public static boolean __every(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        for (var i = 0; i < arr.size(); i++) {
+            if (arr.has(i) && !Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, arr
+            ))) return false;
+        }
+
+        return true;
+    }
+    @Expose public static boolean __some(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        for (var i = 0; i < arr.size(); i++) {
+            if (arr.has(i) && Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, arr
+            ))) return true;
+        }
+
+        return false;
+    }
+    @Expose public static ArrayValue __filter(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var res = new ArrayValue(arr.size());
+
+        for (int i = 0, j = 0; i < arr.size(); i++) {
+            if (arr.has(i) && Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, arr
+            ))) res.set(args.ctx, j++, arr.get(i));
+        }
+
+        return res;
+    }
+    @Expose public static ArrayValue __map(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var res = new ArrayValue(arr.size());
+        res.setSize(arr.size());
+
+        for (int i = 0; i < arr.size(); i++) {
+            if (arr.has(i)) res.set(args.ctx, i, Values.call(args.ctx, args.get(0), args.get(1), arr.get(i), i, arr));
+        }
+        return res;
+    }
+    @Expose public static void __forEach(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var func = args.convert(0, FunctionValue.class);
+        var thisArg = args.get(1);
+
+        for (int i = 0; i < arr.size(); i++) {
+            if (arr.has(i)) func.call(args.ctx, thisArg, arr.get(i), i, arr);
+        }
+    }
+
+    @Expose public static Object __reduce(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var func = args.convert(0, FunctionValue.class);
+        var res = args.get(1);
+        var i = 0;
+
+        if (args.n() < 2) {
+            for (; i < arr.size(); i++) {
+                if (arr.has(i)){
+                    res = arr.get(i++);
+                    break;
+                }
+            }
+        }
+
+        for (; i < arr.size(); i++) {
+            if (arr.has(i)) {
+                res = func.call(args.ctx, null, res, arr.get(i), i, arr);
+            }
+        }
+
+        return res;
+    }
+    @Expose public static Object __reduceRight(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var func = args.convert(0, FunctionValue.class);
+        var res = args.get(1);
+        var i = arr.size();
+
+        if (args.n() < 2) {
+            while (!arr.has(i--) && i >= 0) {
+                res = arr.get(i);
+            }
+        }
+        else i--;
+
+        for (; i >= 0; i--) {
+            if (arr.has(i)) {
+                res = func.call(args.ctx, null, res, arr.get(i), i, arr);
+            }
+        }
+
+        return res;
+    }
+
+    @Expose public static ArrayValue __flat(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var depth = args.getInt(0, 1);
+        var res = new ArrayValue(arr.size());
+        var stack = new Stack<Object>();
+        var depths = new Stack<Integer>();
+
+        stack.push(arr);
+        depths.push(-1);
+
+        while (!stack.empty()) {
+            var el = stack.pop();
+            int d = depths.pop();
+
+            if ((d == -1 || d < depth) && el instanceof ArrayValue) {
+                var arrEl = (ArrayValue)el;
+                for (int i = arrEl.size() - 1; i >= 0; i--) {
+                    if (!arrEl.has(i)) continue;
+                    stack.push(arrEl.get(i));
+                    depths.push(d + 1);
+                }
+            }
+            else res.set(args.ctx, res.size(), el);
+        }
+
+        return res;
+    }
+    @Expose public static ArrayValue __flatMap(Arguments args) {
+        return __flat(new Arguments(args.ctx, __map(args), 1));
+    }
+
+    @Expose public static Object __find(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        for (int i = 0; i < arr.size(); i++) {
+            if (arr.has(i) && Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, args.self
+            ))) return arr.get(i);
+        }
+
+        return null;
+    }
+    @Expose public static Object __findLast(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        for (var i = arr.size() - 1; i >= 0; i--) {
+            if (arr.has(i) && Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, args.self
+            ))) return arr.get(i);
+        }
+
+        return null;
+    }
+
+    @Expose public static int __findIndex(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        for (int i = 0; i < arr.size(); i++) {
+            if (arr.has(i) && Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, args.self
+            ))) return i;
+        }
+
+        return -1;
+    }
+    @Expose public static int __findLastIndex(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        for (var i = arr.size() - 1; i >= 0; i--) {
+            if (arr.has(i) && Values.toBoolean(Values.call(
+                args.ctx, args.get(0), args.get(1),
+                arr.get(i), i, args.self
+            ))) return i;
+        }
+
+        return -1;
+    }
+
+    @Expose public static int __indexOf(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var val = args.get(0);
+        var start = normalizeI(arr.size(), args.getInt(1), true);
+
+        for (int i = start; i < arr.size(); i++) {
+            if (Values.strictEquals(args.ctx, arr.get(i), val)) return i;
+        }
+
+        return -1;
+    }
+    @Expose public static int __lastIndexOf(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var val = args.get(0);
+        var start = normalizeI(arr.size(), args.getInt(1), true);
+
+        for (int i = arr.size(); i >= start; i--) {
+            if (Values.strictEquals(args.ctx, arr.get(i), val)) return i;
+        }
+
+        return -1;
+    }
+
+    @Expose public static boolean __includes(Arguments args) {
+        return __indexOf(args) >= 0;
+    }
+
+    @Expose public static Object __pop(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        if (arr.size() == 0) return null;
+
+        var val = arr.get(arr.size() - 1);
+        arr.shrink(1);
+        return val;
+    }
+    @Expose public static int __push(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var values = args.args;
+
+        arr.copyFrom(args.ctx, values, 0, arr.size(), values.length);
+        return arr.size();
+    }
+
+    @Expose public static Object __shift(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+
+        if (arr.size() == 0) return null;
+        var val = arr.get(0);
+
+        arr.move(1, 0, arr.size());
+        arr.shrink(1);
+        return val;
+    }
+    @Expose public static int __unshift(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var values = args.slice(0).args;
+
+        arr.move(0, values.length, arr.size());
+        arr.copyFrom(args.ctx, values, 0, 0, values.length);
+        return arr.size();
+    }
+
+    @Expose public static ArrayValue __slice(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var start = normalizeI(arr.size(), args.getInt(0), true);
+        var end = normalizeI(arr.size(), args.getInt(1, arr.size()), true);
+
+        var res = new ArrayValue(end - start);
+        arr.copyTo(res, start, 0, end - start);
+        return res;
+    }
+
+    @Expose public static ArrayValue __splice(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var start = normalizeI(arr.size(), args.getInt(0), true);
+        var deleteCount = normalizeI(arr.size(), args.getInt(1, arr.size()), true);
+        var items = args.slice(2).args;
+
+        if (start + deleteCount >= arr.size()) deleteCount = arr.size() - start;
+
+        var size = arr.size() - deleteCount + items.length;
+        var res = new ArrayValue(deleteCount);
+        arr.copyTo(res, start, 0, deleteCount);
+        arr.move(start + deleteCount, start + items.length, arr.size() - start - deleteCount);
+        arr.copyFrom(args.ctx, items, 0, start, items.length);
+        arr.setSize(size);
+
+        return res;
+    }
+    @Expose public static String __toString(Arguments args) {
+        return __join(new Arguments(args.ctx, args.self, ","));
+    }
+
+    @Expose public static String __join(Arguments args) {
+        var arr = args.self(ArrayValue.class);
+        var sep = args.getString(0, ", ");
+        var res = new StringBuilder();
+        var comma = false;
+
+        for (int i = 0; i < arr.size(); i++) {
+            if (!arr.has(i)) continue;
+
+            if (comma) res.append(sep);
+            comma = true;
+
+            var el = arr.get(i);
+            if (el == null || el == Values.NULL) continue;
+
+            res.append(Values.toString(args.ctx, el));
+        }
+
+        return res.toString();
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isArray(Arguments args) {
+        return args.get(0) instanceof ArrayValue;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __of(Arguments args) {
+        return new ArrayValue(args.ctx, args.slice(0).args);
+    }
+
+    @ExposeConstructor public static ArrayValue __constructor(Arguments args) {
+        ArrayValue res;
+
+        if (args.n() == 1 && args.get(0) instanceof Number) {
+            var len = args.getInt(0);
+            res = new ArrayValue(len);
+            res.setSize(len);
+        }
+        else {
+            var val = args.args;
+            res = new ArrayValue(val.length);
+            res.copyFrom(args.ctx, val, 0, 0, val.length);
+        }
+
+        return res;
+    }
+}

src/java/me/topchetoeu/jscript/lib/AsyncFunctionLib.java

@@ -0,0 +1,85 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.lib.PromiseLib.Handle;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("AsyncFunction")
+public class AsyncFunctionLib extends FunctionValue {
+    public final CodeFunction func;
+
+    private static class AsyncHelper {
+        public PromiseLib promise = new PromiseLib();
+        public Frame frame;
+
+        private boolean awaiting = false;
+
+        private void next(Context ctx, Object inducedValue, EngineException inducedError) {
+            Object res = null;
+
+            frame.onPush();
+            awaiting = false;
+            while (!awaiting) {
+                try {
+                    res = frame.next(inducedValue, Values.NO_RETURN, inducedError);
+                    inducedValue = Values.NO_RETURN;
+                    inducedError = null;
+
+                    if (res != Values.NO_RETURN) {
+                        promise.fulfill(ctx, res);
+                        break;
+                    }
+                }
+                catch (EngineException e) {
+                    promise.reject(ctx, e);
+                    break;
+                }
+            }
+            frame.onPop();
+
+            if (awaiting) {
+                PromiseLib.handle(ctx, frame.pop(), new Handle() {
+                    @Override
+                    public void onFulfil(Object val) {
+                        next(ctx, val, null);
+                    }
+                    @Override
+                    public void onReject(EngineException err) {
+                        next(ctx, Values.NO_RETURN, err);
+                    }
+                }.defer(ctx));
+            }
+        }
+
+        public Object await(Arguments args) {
+            this.awaiting = true;
+            return args.get(0);
+        }
+    }
+
+    @Override
+    public Object call(Context ctx, Object thisArg, Object ...args) {
+        var handler = new AsyncHelper();
+
+        var newArgs = new Object[args.length + 1];
+        newArgs[0] = new NativeFunction("await", handler::await);
+        System.arraycopy(args, 0, newArgs, 1, args.length);
+
+        handler.frame = new Frame(ctx, thisArg, newArgs, (CodeFunction)func);
+        handler.next(ctx, Values.NO_RETURN, null);
+        return handler.promise;
+    }
+
+    public AsyncFunctionLib(FunctionValue func) {
+        super(func.name, func.length);
+        if (!(func instanceof CodeFunction)) throw EngineException.ofType("Return value of argument must be a js function.");
+        this.func = (CodeFunction)func;
+    }
+}

src/java/me/topchetoeu/jscript/lib/AsyncGeneratorFunctionLib.java

@@ -0,0 +1,33 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("AsyncGeneratorFunction")
+public class AsyncGeneratorFunctionLib extends FunctionValue {
+    public final CodeFunction func;
+
+    @Override
+    public Object call(Context ctx, Object thisArg, Object ...args) {
+        var handler = new AsyncGeneratorLib();
+
+        var newArgs = new Object[args.length + 2];
+        newArgs[0] = new NativeFunction("await", handler::await);
+        newArgs[1] = new NativeFunction("yield", handler::yield);
+        System.arraycopy(args, 0, newArgs, 2, args.length);
+
+        handler.frame = new Frame(ctx, thisArg, newArgs, func);
+        return handler;
+    }
+
+    public AsyncGeneratorFunctionLib(CodeFunction func) {
+        super(func.name, func.length);
+        if (!(func instanceof CodeFunction)) throw EngineException.ofType("Return value of argument must be a js function.");
+        this.func = func;
+    }
+}

src/java/me/topchetoeu/jscript/lib/AsyncGeneratorLib.java

@@ -0,0 +1,107 @@
+package me.topchetoeu.jscript.lib;
+
+import java.util.Map;
+
+import me.topchetoeu.jscript.lib.PromiseLib.Handle;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("AsyncGenerator")
+public class AsyncGeneratorLib {
+    private int state = 0;
+    private boolean done = false;
+    private PromiseLib currPromise;
+    public Frame frame;
+
+    private void next(Context ctx, Object inducedValue, Object inducedReturn, EngineException inducedError) {
+        if (done) {
+            if (inducedError != null) throw inducedError;
+            currPromise.fulfill(ctx, new ObjectValue(ctx, Map.of(
+                "done", true,
+                "value", inducedReturn == Values.NO_RETURN ? null : inducedReturn
+            )));
+            return;
+        }
+
+        Object res = null;
+        state = 0;
+
+        frame.onPush();
+        while (state == 0) {
+            try {
+                res = frame.next(inducedValue, inducedReturn, inducedError);
+                inducedValue = inducedReturn = Values.NO_RETURN;
+                inducedError = null;
+
+                if (res != Values.NO_RETURN) {
+                    var obj = new ObjectValue();
+                    obj.defineProperty(ctx, "done", true);
+                    obj.defineProperty(ctx, "value", res);
+                    currPromise.fulfill(ctx, obj);
+                    break;
+                }
+            }
+            catch (EngineException e) {
+                currPromise.reject(ctx, e);
+                break;
+            }
+        }
+        frame.onPop();
+
+        if (state == 1) {
+            PromiseLib.handle(ctx, frame.pop(), new Handle() {
+                @Override public void onFulfil(Object val) {
+                    next(ctx, val, Values.NO_RETURN, null);
+                }
+                @Override public void onReject(EngineException err) {
+                    next(ctx, Values.NO_RETURN, Values.NO_RETURN, err);
+                }
+            }.defer(ctx));
+        }
+        else if (state == 2) {
+            var obj = new ObjectValue();
+            obj.defineProperty(ctx, "done", false);
+            obj.defineProperty(ctx, "value", frame.pop());
+            currPromise.fulfill(ctx, obj);
+        }
+    }
+
+    @Override
+    public String toString() {
+        if (done) return "Generator [closed]";
+        if (state != 0) return "Generator [suspended]";
+        return "Generator [running]";
+    }
+
+    public Object await(Arguments args) {
+        this.state = 1;
+        return args.get(0);
+    }
+    public Object yield(Arguments args) {
+        this.state = 2;
+        return args.get(0);
+    }
+
+    @Expose public PromiseLib __next(Arguments args) {
+        this.currPromise = new PromiseLib();
+        if (args.has(0)) next(args.ctx, args.get(0), Values.NO_RETURN, null);
+        else next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, null);
+        return this.currPromise;
+    }
+    @Expose public PromiseLib __return(Arguments args) {
+        this.currPromise = new PromiseLib();
+        next(args.ctx, Values.NO_RETURN, args.get(0), null);
+        return this.currPromise;
+    }
+    @Expose public PromiseLib __throw(Arguments args) {
+        this.currPromise = new PromiseLib();
+        next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, new EngineException(args.get(0)).setCtx(args.ctx));
+        return this.currPromise;
+    }
+}

src/java/me/topchetoeu/jscript/lib/BooleanLib.java

@@ -0,0 +1,37 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Boolean")
+public class BooleanLib {
+    public static final BooleanLib TRUE = new BooleanLib(true);
+    public static final BooleanLib FALSE = new BooleanLib(false);
+
+    public final boolean value;
+
+    @Override public String toString() {
+        return value + "";
+    }
+
+    public BooleanLib(boolean val) {
+        this.value = val;
+    }
+
+    @ExposeConstructor public static Object __constructor(Arguments args) {
+        var val = args.getBoolean(0);
+        if (args.self instanceof ObjectValue) return val ? TRUE : FALSE;
+        else return val;
+    }
+    @Expose public static String __toString(Arguments args) {
+        return args.self(Boolean.class) ? "true" : "false";
+    }
+    @Expose public static boolean __valueOf(Arguments args) {
+        if (Values.isWrapper(args.self, BooleanLib.class)) return Values.wrapper(args.self, BooleanLib.class).value;
+        return args.self(Boolean.class);
+    }
+}

src/java/me/topchetoeu/jscript/lib/ConsoleLib.java

@@ -0,0 +1,38 @@
+package me.topchetoeu.jscript.lib;
+
+import java.io.IOException;
+
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.filesystem.File;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Console")
+public class ConsoleLib {
+    public static interface Writer {
+        void writeLine(String val) throws IOException;
+    }
+
+    private File file;
+
+    @Expose
+    public void __log(Arguments args) {
+        var res = new StringBuilder();
+        var first = true;
+        
+        for (var el : args.args) {
+            if (!first) res.append(" ");
+            first = false;
+            res.append(Values.toReadable(args.ctx, el).getBytes());
+        }
+
+        for (var line : res.toString().split("\n", -1)) {
+            file.write(line.getBytes());
+        }
+    }
+
+    public ConsoleLib(File file) {
+        this.file = file;
+    }
+}

src/java/me/topchetoeu/jscript/lib/DateLib.java

@@ -1,11 +1,16 @@
 package me.topchetoeu.jscript.lib;
 
 import java.util.Calendar;
+import java.util.Date;
 import java.util.TimeZone;
 
-import me.topchetoeu.jscript.engine.Context;
-import me.topchetoeu.jscript.interop.Native;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
 
+@WrapperName("Date")
 public class DateLib {
     private Calendar normal;
     private Calendar utc;
@@ -22,244 +27,221 @@ public class DateLib {
         normal = utc = null;
     }
 
-    @Native
-    public static double now() {
-        return new DateLib().getTime();
-    }
-
-    @Native
-    public double getYear() {
+    @Expose public double __getYear() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.YEAR) - 1900;
     }
-    @Native
-    public double setYear(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setYeard(Arguments args) {
+        var real = args.getDouble(0);
         if (real >= 0 && real <= 99) real = real + 1900;
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.YEAR, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
 
-    @Native
-    public double getFullYear() {
+    @Expose public double __getFullYear() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.YEAR);
     }
-    @Native
-    public double getMonth() {
+    @Expose public double __getMonth() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.MONTH);
     }
-    @Native
-    public double getDate() {
+    @Expose public double __getDate() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.DAY_OF_MONTH);
     }
-    @Native
-    public double getDay() {
+    @Expose public double __getDay() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.DAY_OF_WEEK);
     }
-    @Native
-    public double getHours() {
+    @Expose public double __getHours() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.HOUR_OF_DAY);
     }
-    @Native
-    public double getMinutes() {
+    @Expose public double __getMinutes() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.MINUTE);
     }
-    @Native
-    public double getSeconds() {
+    @Expose public double __getSeconds() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.SECOND);
     }
-    @Native
-    public double getMilliseconds() {
+    @Expose public double __getMilliseconds() {
         if (normal == null) return Double.NaN;
         return normal.get(Calendar.MILLISECOND);
     }
 
-    @Native
-    public double getUTCFullYear() {
+    @Expose public double __getUTCFullYear() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.YEAR);
     }
-    @Native
-    public double getUTCMonth() {
+    @Expose public double __getUTCMonth() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.MONTH);
     }
-    @Native
-    public double getUTCDate() {
+    @Expose public double __getUTCDate() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.DAY_OF_MONTH);
     }
-    @Native
-    public double getUTCDay() {
+    @Expose public double __getUTCDay() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.DAY_OF_WEEK);
     }
-    @Native
-    public double getUTCHours() {
+    @Expose public double __getUTCHours() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.HOUR_OF_DAY);
     }
-    @Native
-    public double getUTCMinutes() {
+    @Expose public double __getUTCMinutes() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.MINUTE);
     }
-    @Native
-    public double getUTCSeconds() {
+    @Expose public double __getUTCSeconds() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.SECOND);
     }
-    @Native
-    public double getUTCMilliseconds() {
+    @Expose public double __getUTCMilliseconds() {
         if (utc == null) return Double.NaN;
         return utc.get(Calendar.MILLISECOND);
     }
 
-    @Native
-    public double setFullYear(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setFullYear(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.YEAR, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setMonth(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setMonthd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.MONTH, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setDate(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setDated(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.DAY_OF_MONTH, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setDay(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setDayd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.DAY_OF_WEEK, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setHours(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setHoursd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.HOUR_OF_DAY, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setMinutes(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setMinutesd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.MINUTE, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setSeconds(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setSecondsd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.SECOND, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setMilliseconds(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setMillisecondsd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else normal.set(Calendar.MILLISECOND, (int)real);
         updateUTC();
-        return getTime();
+        return __getTime();
     }
 
-    @Native
-    public double setUTCFullYear(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCFullYeard(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.YEAR, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCMonth(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCMonthd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.MONTH, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCDate(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCDated(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.DAY_OF_MONTH, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCDay(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCDayd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.DAY_OF_WEEK, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCHours(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCHoursd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.HOUR_OF_DAY, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCMinutes(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCMinutesd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.MINUTE, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCSeconds(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCSecondsd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.SECOND, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
-    @Native
-    public double setUTCMilliseconds(Context ctx, double real) throws InterruptedException {
+    @Expose public double __setUTCMillisecondsd(Arguments args) {
+        var real = args.getDouble(0);
         if (Double.isNaN(real)) invalidate();
         else utc.set(Calendar.MILLISECOND, (int)real);
         updateNormal();
-        return getTime();
+        return __getTime();
     }
 
-    @Native
-    public double getTime() {
+    @Expose public double __getTime() {
         if (utc == null) return Double.NaN;
         return utc.getTimeInMillis();
     }
-    @Native
-    public double getTimezoneOffset() {
+    @Expose public double __getTimezoneOffset() {
         if (normal == null) return Double.NaN;
         return normal.getTimeZone().getRawOffset() / 60000;
     }
 
-    @Native
-    public double valueOf() {
+    @Expose public double __valueOf() {
         if (normal == null) return Double.NaN;
         else return normal.getTimeInMillis();
     }
 
-    @Native
-    public String toString() {
+    @Expose public String __toString() {
         return normal.getTime().toString();
     }
 
-    @Native
+    @Override public String toString() {
+        return __toString();
+    }
+
     public DateLib(long timestamp) {
         normal = Calendar.getInstance();
         utc = Calendar.getInstance();
@@ -268,8 +250,17 @@ public class DateLib {
         utc.setTimeInMillis(timestamp);
     }
 
-    @Native
     public DateLib() {
-        this(new java.util.Date().getTime());
+        this(new Date().getTime());
+    }
+
+    @ExposeConstructor public static DateLib init(Arguments args) {
+        if (args.has(0)) return new DateLib(args.getLong(0));
+        else return new DateLib();
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __now() {
+        return new DateLib().__getTime();
     }
 }

src/java/me/topchetoeu/jscript/lib/EncodingLib.java

@@ -0,0 +1,89 @@
+package me.topchetoeu.jscript.lib;
+
+import java.util.ArrayList;
+
+import me.topchetoeu.jscript.common.Buffer;
+import me.topchetoeu.jscript.compilation.parsing.Parsing;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Encoding")
+public class EncodingLib {
+    private static final String HEX = "0123456789ABCDEF";
+
+    public static String encodeUriAny(String str, String keepAlphabet) {
+        if (str == null) str = "undefined";
+
+        var bytes = str.getBytes();
+        var sb = new StringBuilder(bytes.length);
+
+        for (byte c : bytes) {
+            if (Parsing.isAlphanumeric((char)c) || Parsing.isAny((char)c, keepAlphabet)) sb.append((char)c);
+            else {
+                sb.append('%');
+                sb.append(HEX.charAt(c / 16));
+                sb.append(HEX.charAt(c % 16));
+            }
+        }
+
+        return sb.toString();
+    }
+    public static String decodeUriAny(String str, String keepAlphabet) {
+        if (str == null) str = "undefined";
+
+        var res = new Buffer();
+        var bytes = str.getBytes();
+
+        for (var i = 0; i < bytes.length; i++) {
+            var c = bytes[i];
+            if (c == '%') {
+                if (i >= bytes.length - 2) throw EngineException.ofError("URIError", "URI malformed.");
+                var b = Parsing.fromHex((char)bytes[i + 1]) * 16 | Parsing.fromHex((char)bytes[i + 2]);
+                if (!Parsing.isAny((char)b, keepAlphabet)) {
+                    i += 2;
+                    res.append((byte)b);
+                    continue;
+                }
+            }
+            res.append(c);
+        }
+
+        return new String(res.data());
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __encode(Arguments args) {
+        var res = new ArrayValue();
+        for (var el : args.getString(0).getBytes()) res.set(null, res.size(), (int)el);
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __decode(Arguments args) {
+        var raw = args.convert(0, ArrayList.class);
+        var res = new byte[raw.size()];
+        for (var i = 0; i < raw.size(); i++) res[i] = (byte)Values.toNumber(args.ctx, raw.get(i));
+        return new String(res);
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __encodeURIComponent(Arguments args) {
+        return EncodingLib.encodeUriAny(args.getString(0), ".-_!~*'()");
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __decodeURIComponent(Arguments args) {
+        return decodeUriAny(args.getString(0), "");
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __encodeURI(Arguments args) {
+        return encodeUriAny(args.getString(0), ";,/?:@&=+$#.-_!~*'()");
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __decodeURI(Arguments args) {
+        return decodeUriAny(args.getString(0), ",/?:@&=+$#.");
+    }
+}

src/java/me/topchetoeu/jscript/lib/ErrorLib.java

@@ -0,0 +1,54 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.exceptions.ConvertException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeField;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Error")
+public class ErrorLib {
+    private static String toString(Context ctx, Object name, Object message) {
+        if (name == null) name = "";
+        else name = Values.toString(ctx, name).trim();
+        if (message == null) message = "";
+        else message = Values.toString(ctx, message).trim();
+        StringBuilder res = new StringBuilder();
+
+        if (!name.equals("")) res.append(name);
+        if (!message.equals("") && !name.equals("")) res.append(": ");
+        if (!message.equals("")) res.append(message);
+
+        return res.toString();
+    }
+
+    @ExposeField public static final String __name = "Error";
+
+    @Expose public static String __toString(Arguments args) {
+        if (args.self instanceof ObjectValue) return toString(args.ctx,
+            Values.getMember(args.ctx, args.self, "name"),
+            Values.getMember(args.ctx, args.self, "message")
+        );
+        else return "[Invalid error]";
+    }
+
+    @ExposeConstructor public static ObjectValue __constructor(Arguments args) {
+        var target = new ObjectValue();
+        var message = args.getString(0, "");
+
+        try {
+            target = args.self(ObjectValue.class);
+        }
+        catch (ConvertException e) {}
+
+        target.setPrototype(PlaceholderProto.ERROR);
+        target.defineProperty(args.ctx, "message", Values.toString(args.ctx, message));
+
+        return target;
+    }
+}

src/java/me/topchetoeu/jscript/lib/FileLib.java

@@ -0,0 +1,84 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.filesystem.File;
+import me.topchetoeu.jscript.utils.filesystem.FilesystemException;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("File")
+public class FileLib {
+    public final File fd;
+
+    @Expose public PromiseLib __pointer(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            try {
+                return fd.seek(0, 1);
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose public PromiseLib __length(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            try {
+                long curr = fd.seek(0, 1);
+                long res = fd.seek(0, 2);
+                fd.seek(curr, 0);
+                return res;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+
+    @Expose public PromiseLib __read(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            var n = args.getInt(0);
+            try {
+                var buff = new byte[n];
+                var res = new ArrayValue();
+                int resI = fd.read(buff);
+
+                for (var i = resI - 1; i >= 0; i--) res.set(args.ctx, i, (int)buff[i]);
+                return res;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose public PromiseLib __write(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            var val = args.convert(0, ArrayValue.class);
+            try {
+                var res = new byte[val.size()];
+
+                for (var i = 0; i < val.size(); i++) res[i] = (byte)Values.toNumber(args.ctx, val.get(i));
+                fd.write(res);
+
+                return null;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose public PromiseLib __close(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            fd.close();
+            return null;
+        });
+    }
+    @Expose public PromiseLib __seek(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            var ptr = args.getLong(0);
+            var whence = args.getInt(1);
+
+            try {
+                return fd.seek(ptr, whence);
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+
+    public FileLib(File fd) {
+        this.fd = fd;
+    }
+}

src/java/me/topchetoeu/jscript/lib/FilesystemLib.java

@@ -0,0 +1,193 @@
+package me.topchetoeu.jscript.lib;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.Stack;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.filesystem.ActionType;
+import me.topchetoeu.jscript.utils.filesystem.EntryType;
+import me.topchetoeu.jscript.utils.filesystem.ErrorReason;
+import me.topchetoeu.jscript.utils.filesystem.File;
+import me.topchetoeu.jscript.utils.filesystem.FileStat;
+import me.topchetoeu.jscript.utils.filesystem.Filesystem;
+import me.topchetoeu.jscript.utils.filesystem.FilesystemException;
+import me.topchetoeu.jscript.utils.filesystem.Mode;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeField;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Filesystem")
+public class FilesystemLib {
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final int __SEEK_SET = 0;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final int __SEEK_CUR = 1;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final int __SEEK_END = 2;
+
+    private static Filesystem fs(Context ctx) {
+        var fs = Filesystem.get(ctx);
+        if (fs != null) return fs;
+        throw EngineException.ofError("Current environment doesn't have a file system.");
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __normalize(Arguments args) {
+        return fs(args.ctx).normalize(args.convert(String.class));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __open(Arguments args) {
+        return PromiseLib.await(args.ctx, () -> {
+            var fs = fs(args.ctx);
+            var path = fs.normalize(args.getString(0));
+            var _mode = Mode.parse(args.getString(1));
+
+            try {
+                if (fs.stat(path).type != EntryType.FILE) {
+                    throw new FilesystemException(ErrorReason.DOESNT_EXIST, "Not a file").setAction(ActionType.OPEN);
+                }
+
+                return new FileLib(fs.open(path, _mode));
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __ls(Arguments args) {
+
+        return Values.toJSAsyncIterator(args.ctx, new Iterator<>() {
+            private boolean failed, done;
+            private File file;
+            private String nextLine;
+
+            private void update() {
+                if (done) return;
+                if (!failed) {
+                    if (file == null) {
+                        var fs = fs(args.ctx);
+                        var path = fs.normalize(args.getString(0));
+
+                        if (fs.stat(path).type != EntryType.FOLDER) {
+                            throw new FilesystemException(ErrorReason.DOESNT_EXIST, "Not a directory").setAction(ActionType.OPEN);
+                        }
+
+                        file = fs.open(path, Mode.READ);
+                    }
+
+                    if (nextLine == null) {
+                        while (true) {
+                            nextLine = file.readLine();
+                            if (nextLine == null) {
+                                done = true;
+                                return;
+                            }
+                            nextLine = nextLine.trim();
+                            if (!nextLine.equals("")) break;
+                        }
+                    }
+                }
+            }
+
+            @Override
+            public boolean hasNext() {
+                try {
+                    update();
+                    return !done && !failed;
+                }
+                catch (FilesystemException e) { throw e.toEngineException(); }
+            }
+            @Override
+            public String next() {
+                try {
+                    update();
+                    var res = nextLine;
+                    nextLine = null;
+                    return res;
+                }
+                catch (FilesystemException e) { throw e.toEngineException(); }
+            }
+        });
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __mkdir(Arguments args) throws IOException {
+        return PromiseLib.await(args.ctx, () -> {
+            try {
+                fs(args.ctx).create(args.getString(0), EntryType.FOLDER);
+                return null;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __mkfile(Arguments args) throws IOException {
+        return PromiseLib.await(args.ctx, () -> {
+            try {
+                fs(args.ctx).create(args.getString(0), EntryType.FILE);
+                return null;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __rm(Arguments args) throws IOException {
+        return PromiseLib.await(args.ctx, () -> {
+            try {
+                var fs = fs(args.ctx);
+                var path = fs.normalize(args.getString(0));
+                var recursive = args.getBoolean(1);
+
+                if (!recursive) fs.create(path, EntryType.NONE);
+                else {
+                    var stack = new Stack<String>();
+                    stack.push(path);
+
+                    while (!stack.empty()) {
+                        var currPath = stack.pop();
+                        FileStat stat;
+
+                        try { stat = fs.stat(currPath); }
+                        catch (FilesystemException e) { continue; }
+
+                        if (stat.type == EntryType.FOLDER) {
+                            for (var el : fs.open(currPath, Mode.READ).readToString().split("\n")) stack.push(el);
+                        }
+                        else fs.create(currPath, EntryType.NONE);
+                    }
+                }
+                return null;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __stat(Arguments args) throws IOException {
+        return PromiseLib.await(args.ctx, () -> {
+            try {
+                var fs = fs(args.ctx);
+                var path = fs.normalize(args.getString(0));
+                var stat = fs.stat(path);
+                var res = new ObjectValue();
+
+                res.defineProperty(args.ctx, "type", stat.type.name);
+                res.defineProperty(args.ctx, "mode", stat.mode.name);
+                return res;
+            }
+            catch (FilesystemException e) { throw e.toEngineException(); }
+        });
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __exists(Arguments args) throws IOException {
+        return PromiseLib.await(args.ctx, () -> {
+            try { fs(args.ctx).stat(args.getString(0)); return true; }
+            catch (FilesystemException e) { return false; }
+        });
+    }
+}

src/java/me/topchetoeu/jscript/lib/FunctionLib.java

@@ -0,0 +1,54 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Function")
+public class FunctionLib {
+    @Expose public static Object __apply(Arguments args) {
+        return args.self(FunctionValue.class).call(args.ctx, args.get(0), args.convert(1, ArrayValue.class).toArray());
+    }
+    @Expose public static Object __call(Arguments args) {
+        return args.self(FunctionValue.class).call(args.ctx, args.get(0), args.slice(1).args);
+    }
+    @Expose public static FunctionValue __bind(Arguments args) {
+        var self = args.self(FunctionValue.class);
+        var thisArg = args.get(0);
+        var bindArgs = args.slice(1).args;
+
+        return new NativeFunction(self.name + " (bound)", callArgs -> {
+            Object[] resArgs;
+
+            if (args.n() == 0) resArgs = bindArgs;
+            else {
+                resArgs = new Object[bindArgs.length + callArgs.n()];
+                System.arraycopy(bindArgs, 0, resArgs, 0, bindArgs.length);
+                System.arraycopy(callArgs.args, 0, resArgs, bindArgs.length, callArgs.n());
+            }
+
+            return self.call(callArgs.ctx, thisArg, resArgs);
+        });
+    }
+    @Expose public static String __toString(Arguments args) {
+        return args.self.toString();
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static FunctionValue __async(Arguments args) {
+        return new AsyncFunctionLib(args.convert(0, FunctionValue.class));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static FunctionValue __asyncGenerator(Arguments args) {
+        return new AsyncGeneratorFunctionLib(args.convert(0, CodeFunction.class));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static FunctionValue __generator(Arguments args) {
+        return new GeneratorFunctionLib(args.convert(0, CodeFunction.class));
+    }
+}

src/java/me/topchetoeu/jscript/lib/GeneratorFunctionLib.java

@@ -0,0 +1,31 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("GeneratorFunction")
+public class GeneratorFunctionLib extends FunctionValue {
+    public final CodeFunction func;
+
+    @Override public Object call(Context ctx, Object thisArg, Object ...args) {
+        var handler = new GeneratorLib();
+
+        var newArgs = new Object[args.length + 1];
+        newArgs[0] = new NativeFunction("yield", handler::yield);
+        System.arraycopy(args, 0, newArgs, 1, args.length);
+
+        handler.frame = new Frame(ctx, thisArg, newArgs, func);
+        return handler;
+    }
+
+    public GeneratorFunctionLib(CodeFunction func) {
+        super(func.name, func.length);
+        if (!(func instanceof CodeFunction)) throw EngineException.ofType("Return value of argument must be a js function.");
+        this.func = func;
+    }
+}

src/java/me/topchetoeu/jscript/lib/GeneratorLib.java

@@ -0,0 +1,78 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Generator")
+public class GeneratorLib {
+    private boolean yielding = true;
+    private boolean done = false;
+    public Frame frame;
+
+    private ObjectValue next(Context ctx, Object inducedValue, Object inducedReturn, EngineException inducedError) {
+        if (done) {
+            if (inducedError != Values.NO_RETURN) throw inducedError;
+            var res = new ObjectValue();
+            res.defineProperty(ctx, "done", true);
+            res.defineProperty(ctx, "value", inducedReturn == Values.NO_RETURN ? null : inducedReturn);
+            return res;
+        }
+
+        Object res = null;
+        yielding = false;
+
+        frame.onPush();
+        while (!yielding) {
+            try {
+                res = frame.next(inducedValue, inducedReturn, inducedError);
+                inducedReturn = Values.NO_RETURN;
+                inducedError = null;
+                if (res != Values.NO_RETURN) {
+                    done = true;
+                    break;
+                }
+            }
+            catch (EngineException e) {
+                done = true;
+                throw e;
+            }
+        }
+        frame.onPop();
+
+        if (done) frame = null;
+        else res = frame.pop();
+
+        var obj = new ObjectValue();
+        obj.defineProperty(ctx, "done", done);
+        obj.defineProperty(ctx, "value", res);
+        return obj;
+    }
+
+    @Expose public ObjectValue __next(Arguments args) {
+        if (args.n() == 0) return next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, null);
+        else return next(args.ctx, args.get(0), Values.NO_RETURN, null);
+    }
+    @Expose public ObjectValue __throw(Arguments args) {
+        return next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, new EngineException(args.get(0)).setCtx(args.ctx));
+    }
+    @Expose public ObjectValue __return(Arguments args) {
+        return next(args.ctx, Values.NO_RETURN, args.get(0), null);
+    }
+
+    @Override public String toString() {
+        if (done) return "Generator [closed]";
+        if (yielding) return "Generator [suspended]";
+        return "Generator [running]";
+    }
+
+    public Object yield(Arguments args) {
+        this.yielding = true;
+        return args.get(0);
+    }
+}

src/java/me/topchetoeu/jscript/lib/Internals.java

@@ -0,0 +1,217 @@
+package me.topchetoeu.jscript.lib;
+
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Environment;
+import me.topchetoeu.jscript.runtime.EventLoop;
+import me.topchetoeu.jscript.runtime.Key;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.scope.GlobalScope;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.filesystem.Filesystem;
+import me.topchetoeu.jscript.utils.filesystem.Mode;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeField;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.ExposeType;
+import me.topchetoeu.jscript.utils.modules.ModuleRepo;
+
+public class Internals {
+    private static final Key<HashMap<Integer, Thread>> THREADS = new Key<>();
+    private static final Key<Integer> I = new Key<>();
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __require(Arguments args) {
+        var repo = ModuleRepo.get(args.ctx);
+
+        if (repo != null) {
+            var res = repo.getModule(args.ctx, ModuleRepo.cwd(args.ctx), args.getString(0));
+            res.load(args.ctx);
+            return res.value();
+        }
+
+        else throw EngineException.ofError("Modules are not supported.");
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static Thread __setTimeout(Arguments args) {
+        var func = args.convert(0, FunctionValue.class);
+        var delay = args.getDouble(1);
+        var arguments = args.slice(2).args;
+
+        if (!args.ctx.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+
+        var thread = new Thread(() -> {
+            var ms = (long)delay;
+            var ns = (int)((delay - ms) * 10000000);
+
+            try { Thread.sleep(ms, ns); }
+            catch (InterruptedException e) { return; }
+
+            args.ctx.get(EventLoop.KEY).pushMsg(() -> func.call(new Context(args.ctx.environment), null, arguments), false);
+        });
+
+        thread.start();
+        var i = args.ctx.init(I, 1);
+        args.ctx.add(I, i + 1);
+        args.ctx.init(THREADS, new HashMap<Integer, Thread>()).put(i, thread);
+
+        return thread;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static Thread __setInterval(Arguments args) {
+        var func = args.convert(0, FunctionValue.class);
+        var delay = args.getDouble(1);
+        var arguments = args.slice(2).args;
+
+        if (!args.ctx.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+
+        var thread = new Thread(() -> {
+            var ms = (long)delay;
+            var ns = (int)((delay - ms) * 10000000);
+
+            while (true) {
+                try {
+                    Thread.sleep(ms, ns);
+                }
+                catch (InterruptedException e) { return; }
+
+                args.ctx.get(EventLoop.KEY).pushMsg(() -> func.call(new Context(args.ctx.environment), null, arguments), false);
+            }
+        });
+        thread.start();
+        var i = args.ctx.init(I, 1);
+        args.ctx.add(I, i + 1);
+        args.ctx.init(THREADS, new HashMap<Integer, Thread>()).put(i, thread);
+
+        return thread;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static void __clearTimeout(Arguments args) {
+        var i = args.getInt(0);
+        HashMap<Integer, Thread> map = args.ctx.get(THREADS);
+        if (map == null) return;
+
+        var thread = map.get(i);
+        if (thread == null) return;
+
+        thread.interrupt();
+        map.remove(i);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static void __clearInterval(Arguments args) {
+        __clearTimeout(args);
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __parseInt(Arguments args) {
+        return NumberLib.__parseInt(args);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __parseFloat(Arguments args) {
+        return NumberLib.__parseFloat(args);
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isNaN(Arguments args) {
+        return NumberLib.__isNaN(args);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isFinite(Arguments args) {
+        return NumberLib.__isFinite(args);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isInfinite(Arguments args) {
+        return NumberLib.__isInfinite(args);
+    }
+
+    @Expose(target = ExposeTarget.STATIC, type = ExposeType.GETTER)
+    public static FileLib __stdin(Arguments args) {
+        return new FileLib(Filesystem.get(args.ctx).open("std://in", Mode.READ));
+    }
+    @Expose(target = ExposeTarget.STATIC, type = ExposeType.GETTER)
+    public static FileLib __stdout(Arguments args) {
+        return new FileLib(Filesystem.get(args.ctx).open("std://out", Mode.READ));
+    }
+    @Expose(target = ExposeTarget.STATIC, type = ExposeType.GETTER)
+    public static FileLib __stderr(Arguments args) {
+        return new FileLib(Filesystem.get(args.ctx).open("std://err", Mode.READ));
+    }
+
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static double __NaN = Double.NaN;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static double __Infinity = Double.POSITIVE_INFINITY;
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __encodeURIComponent(Arguments args) {
+        return EncodingLib.__encodeURIComponent(args);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __decodeURIComponent(Arguments args) {
+        return EncodingLib.__decodeURIComponent(args);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __encodeURI(Arguments args) {
+        return EncodingLib.__encodeURI(args);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __decodeURI(Arguments args) {
+        return EncodingLib.__decodeURI(args);
+    }
+
+    public static Environment apply(Environment env) {
+        var wp = env.wrappers;
+        var glob = env.global = new GlobalScope(wp.getNamespace(Internals.class));
+
+        glob.define(null, "Math", false, wp.getNamespace(MathLib.class));
+        glob.define(null, "JSON", false, wp.getNamespace(JSONLib.class));
+        glob.define(null, "Encoding", false, wp.getNamespace(EncodingLib.class));
+        glob.define(null, "Filesystem", false, wp.getNamespace(FilesystemLib.class));
+
+        glob.define(null, false, wp.getConstr(FileLib.class));
+
+        glob.define(null, false, wp.getConstr(DateLib.class));
+        glob.define(null, false, wp.getConstr(ObjectLib.class));
+        glob.define(null, false, wp.getConstr(FunctionLib.class));
+        glob.define(null, false, wp.getConstr(ArrayLib.class));
+
+        glob.define(null, false, wp.getConstr(BooleanLib.class));
+        glob.define(null, false, wp.getConstr(NumberLib.class));
+        glob.define(null, false, wp.getConstr(StringLib.class));
+        glob.define(null, false, wp.getConstr(SymbolLib.class));
+
+        glob.define(null, false, wp.getConstr(PromiseLib.class));
+        glob.define(null, false, wp.getConstr(RegExpLib.class));
+        glob.define(null, false, wp.getConstr(MapLib.class));
+        glob.define(null, false, wp.getConstr(SetLib.class));
+
+        glob.define(null, false, wp.getConstr(ErrorLib.class));
+        glob.define(null, false, wp.getConstr(SyntaxErrorLib.class));
+        glob.define(null, false, wp.getConstr(TypeErrorLib.class));
+        glob.define(null, false, wp.getConstr(RangeErrorLib.class));
+
+        env.add(Environment.OBJECT_PROTO, wp.getProto(ObjectLib.class));
+        env.add(Environment.FUNCTION_PROTO, wp.getProto(FunctionLib.class));
+        env.add(Environment.ARRAY_PROTO, wp.getProto(ArrayLib.class));
+
+        env.add(Environment.BOOL_PROTO, wp.getProto(BooleanLib.class));
+        env.add(Environment.NUMBER_PROTO, wp.getProto(NumberLib.class));
+        env.add(Environment.STRING_PROTO, wp.getProto(StringLib.class));
+        env.add(Environment.SYMBOL_PROTO, wp.getProto(SymbolLib.class));
+
+        env.add(Environment.ERROR_PROTO, wp.getProto(ErrorLib.class));
+        env.add(Environment.SYNTAX_ERR_PROTO, wp.getProto(SyntaxErrorLib.class));
+        env.add(Environment.TYPE_ERR_PROTO, wp.getProto(TypeErrorLib.class));
+        env.add(Environment.RANGE_ERR_PROTO, wp.getProto(RangeErrorLib.class));
+
+        Values.setPrototype(Context.NULL, wp.getProto(ObjectLib.class), null);
+        env.add(Environment.REGEX_CONSTR, wp.getConstr(RegExpLib.class));
+
+        return env;
+    }
+}

src/java/me/topchetoeu/jscript/lib/JSONLib.java

@@ -0,0 +1,24 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.common.json.JSON;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("JSON")
+public class JSONLib {
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __parse(Arguments args) {
+        try {
+            return JSON.toJs(JSON.parse(null, args.getString(0)));
+        }
+        catch (SyntaxException e) { throw EngineException.ofSyntax(e.msg); }
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static String __stringify(Arguments args) {
+        return JSON.stringify(JSON.fromJs(args.ctx, args.get(0)));
+    }
+}

src/java/me/topchetoeu/jscript/lib/MapLib.java

@@ -0,0 +1,87 @@
+package me.topchetoeu.jscript.lib;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.stream.Collectors;
+
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeType;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Map")
+public class MapLib {
+    private LinkedHashMap<Object, Object> map = new LinkedHashMap<>();
+
+    @Expose("@@Symbol.iterator")
+    public ObjectValue __iterator(Arguments args) {
+        return this.__entries(args);
+    }
+
+    @Expose public void __clear() {
+        map.clear();
+    }
+    @Expose public boolean __delete(Arguments args) {
+        var key = args.get(0);
+        if (map.containsKey(key)) {
+            map.remove(key);
+            return true;
+        }
+        return false;
+    }
+
+    @Expose public ObjectValue __entries(Arguments args) {
+        return Values.toJSIterator(args.ctx, map
+            .entrySet()
+            .stream()
+            .map(v -> new ArrayValue(args.ctx, v.getKey(), v.getValue()))
+            .collect(Collectors.toList())
+        );
+    }
+    @Expose public ObjectValue __keys(Arguments args) {
+        return Values.toJSIterator(args.ctx, map.keySet());
+    }
+    @Expose public ObjectValue __values(Arguments args) {
+        return Values.toJSIterator(args.ctx, map.values());
+    }
+
+    @Expose public Object __get(Arguments args) {
+        return map.get(args.get(0));
+    }
+    @Expose public MapLib __set(Arguments args) {
+        map.put(args.get(0), args.get(1));
+        return this;
+    }
+    @Expose public boolean __has(Arguments args) {
+        return map.containsKey(args.get(0));
+    }
+
+    @Expose(type = ExposeType.GETTER)
+    public int __size() {
+        return map.size();
+    }
+
+    @Expose public void __forEach(Arguments args) {
+        var keys = new ArrayList<>(map.keySet());
+
+        for (var el : keys) Values.call(args.ctx, args.get(0), args.get(1), map.get(el), el, args.self);
+    }
+
+    public MapLib(Context ctx, Object iterable) {
+        for (var el : Values.fromJSIterator(ctx, iterable)) {
+            try {
+                map.put(Values.getMember(ctx, el, 0), Values.getMember(ctx, el, 1));
+            }
+            catch (IllegalArgumentException e) { }
+        }
+    }
+
+    @ExposeConstructor public static MapLib __constructor(Arguments args) {
+        return new MapLib(args.ctx, args.get(0));
+    }
+}

src/java/me/topchetoeu/jscript/lib/MathLib.java

@@ -0,0 +1,211 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeField;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Math")
+public class MathLib {
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __E = Math.E;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __PI = Math.PI;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __SQRT2 = Math.sqrt(2);
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __SQRT1_2 = Math.sqrt(.5);
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __LN2 = Math.log(2);
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __LN10 = Math.log(10);
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __LOG2E = Math.log(Math.E) / __LN2;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __LOG10E = Math.log10(Math.E);
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __asin(Arguments args) {
+        return Math.asin(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __acos(Arguments args) {
+        return Math.acos(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __atan(Arguments args) {
+        return Math.atan(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __atan2(Arguments args) {
+        var x = args.getDouble(1);
+        var y = args.getDouble(0);
+
+        if (x == 0) {
+            if (y == 0) return Double.NaN;
+            return Math.signum(y) * Math.PI / 2;
+        }
+        else {
+            var val = Math.atan(y / x);
+            if (x > 0) return val;
+            else if (y < 0) return val - Math.PI;
+            else return val + Math.PI;
+        }
+
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __asinh(Arguments args) {
+        var x = args.getDouble(0);
+        return Math.log(x + Math.sqrt(x * x + 1));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __acosh(Arguments args) {
+        var x = args.getDouble(0);
+        return Math.log(x + Math.sqrt(x * x - 1));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __atanh(Arguments args) {
+        var x = args.getDouble(0);
+
+        if (x <= -1 || x >= 1) return Double.NaN;
+        return .5 * Math.log((1 + x) / (1 - x));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __sin(Arguments args) {
+        return Math.sin(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __cos(Arguments args) {
+        return Math.cos(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __tan(Arguments args) {
+        return Math.tan(args.getDouble(0));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __sinh(Arguments args) {
+        return Math.sinh(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __cosh(Arguments args) {
+        return Math.cosh(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __tanh(Arguments args) {
+        return Math.tanh(args.getDouble(0));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __sqrt(Arguments args) {
+        return Math.sqrt(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __cbrt(Arguments args) {
+        return Math.cbrt(args.getDouble(0));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __hypot(Arguments args) {
+        var res = 0.;
+        for (var i = 0; i < args.n(); i++) {
+            var val = args.getDouble(i);
+            res += val * val;
+        }
+        return Math.sqrt(res);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static int __imul(Arguments args) { return args.getInt(0) * args.getInt(1); }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __exp(Arguments args) {
+        return Math.exp(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __expm1(Arguments args) {
+        return Math.expm1(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __pow(Arguments args) { return Math.pow(args.getDouble(0), args.getDouble(1)); }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __log(Arguments args) {
+        return Math.log(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __log10(Arguments args) {
+        return Math.log10(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __log1p(Arguments args) {
+        return Math.log1p(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __log2(Arguments args) {
+        return Math.log(args.getDouble(0)) / __LN2;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __ceil(Arguments args) {
+        return Math.ceil(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __floor(Arguments args) {
+        return Math.floor(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __round(Arguments args) {
+        return Math.round(args.getDouble(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static float __fround(Arguments args) {
+        return (float)args.getDouble(0);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __trunc(Arguments args) {
+        var x = args.getDouble(0);
+        return Math.floor(Math.abs(x)) * Math.signum(x);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __abs(Arguments args) {
+        return Math.abs(args.getDouble(0));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __max(Arguments args) {
+        var res = Double.NEGATIVE_INFINITY;
+
+        for (var i = 0; i < args.n(); i++) {
+            var el = args.getDouble(i);
+            if (el > res) res = el;
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __min(Arguments args) {
+        var res = Double.POSITIVE_INFINITY;
+
+        for (var i = 0; i < args.n(); i++) {
+            var el = args.getDouble(i);
+            if (el < res) res = el;
+        }
+
+        return res;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __sign(Arguments args) {
+        return Math.signum(args.getDouble(0));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __random() { return Math.random(); }
+    @Expose(target = ExposeTarget.STATIC)
+    public static int __clz32(Arguments args) {
+        return Integer.numberOfLeadingZeros(args.getInt(0));
+    }
+}

src/java/me/topchetoeu/jscript/lib/NumberLib.java

@@ -0,0 +1,92 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeField;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Number")
+public class NumberLib {
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __EPSILON = Math.ulp(1.0);
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __MAX_SAFE_INTEGER = 9007199254740991.;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __MIN_SAFE_INTEGER = -__MAX_SAFE_INTEGER;
+    // lmao big number go brrr
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __MAX_VALUE = 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __MIN_VALUE = -__MAX_VALUE;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __NaN = 0. / 0;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __NEGATIVE_INFINITY = -1. / 0;
+    @ExposeField(target = ExposeTarget.STATIC)
+    public static final double __POSITIVE_INFINITY = 1. / 0;
+
+    public final double value;
+
+    @Override public String toString() { return value + ""; }
+
+    public NumberLib(double val) {
+        this.value = val;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isFinite(Arguments args) { return Double.isFinite(args.getDouble(0)); }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isInfinite(Arguments args) { return Double.isInfinite(args.getDouble(0)); }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isNaN(Arguments args) { return Double.isNaN(args.getDouble(0)); }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isSafeInteger(Arguments args) {
+        return args.getDouble(0) > __MIN_SAFE_INTEGER && args.getDouble(0) < __MAX_SAFE_INTEGER;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __parseFloat(Arguments args) {
+        return args.getDouble(0);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static double __parseInt(Arguments args) {
+        var radix = args.getInt(1, 10);
+
+        if (radix < 2 || radix > 36) return Double.NaN;
+        else {
+            long res = 0;
+            
+            for (var c : args.getString(0).toCharArray()) {
+                var digit = 0;
+
+                if (c >= '0' && c <= '9') digit = c - '0';
+                else if (c >= 'a' && c <= 'z') digit = c - 'a' + 10;
+                else if (c >= 'A' && c <= 'Z') digit = c - 'A' + 10;
+                else break;
+
+                if (digit > radix) break;
+
+                res *= radix;
+                res += digit;
+            }
+
+            return res;
+        }
+    }
+
+    @ExposeConstructor public static Object __constructor(Arguments args) {
+        if (args.self instanceof ObjectValue) return new NumberLib(args.getDouble(0));
+        else return args.getDouble(0);
+    }
+    @Expose public static String __toString(Arguments args) {
+        return Values.toString(args.ctx, args.self);
+    }
+    @Expose public static double __valueOf(Arguments args) {
+        if (Values.isWrapper(args.self, NumberLib.class)) return Values.wrapper(args.self, NumberLib.class).value;
+        else return Values.toNumber(args.ctx, args.self);
+    }
+}

src/java/me/topchetoeu/jscript/lib/ObjectLib.java

@@ -0,0 +1,273 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Object")
+public class ObjectLib {
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __assign(Arguments args) {
+        for (var obj : args.slice(1).args) {
+            for (var key : Values.getMembers(args.ctx, obj, true, true)) {
+                Values.setMember(args.ctx, args.get(0), key, Values.getMember(args.ctx, obj, key));
+            }
+        }
+        return args.get(0);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __create(Arguments args) {
+        var obj = new ObjectValue();
+        Values.setPrototype(args.ctx, obj, args.get(0));
+
+        if (args.n() >= 1) {
+            var newArgs = new Object[args.n()];
+            System.arraycopy(args.args, 1, args, 1, args.n() - 1);
+            newArgs[0] = obj;
+
+            __defineProperties(new Arguments(args.ctx, null, newArgs));
+        }
+
+        return obj;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __defineProperty(Arguments args) {
+        var obj = args.convert(0, ObjectValue.class);
+        var key = args.get(1);
+        var attrib = args.convert(2, ObjectValue.class);
+
+        var hasVal = Values.hasMember(args.ctx, attrib, "value", false);
+        var hasGet = Values.hasMember(args.ctx, attrib, "get", false);
+        var hasSet = Values.hasMember(args.ctx, attrib, "set", false);
+
+        if (hasVal) {
+            if (hasGet || hasSet) throw EngineException.ofType("Cannot specify a value and accessors for a property.");
+            if (!obj.defineProperty(
+                args.ctx, key,
+                Values.getMember(args.ctx, attrib, "value"),
+                Values.toBoolean(Values.getMember(args.ctx, attrib, "writable")),
+                Values.toBoolean(Values.getMember(args.ctx, attrib, "configurable")),
+                Values.toBoolean(Values.getMember(args.ctx, attrib, "enumerable"))
+            )) throw EngineException.ofType("Can't define property '" + key + "'.");
+        }
+        else {
+            var get = Values.getMember(args.ctx, attrib, "get");
+            var set = Values.getMember(args.ctx, attrib, "set");
+            if (get != null && !(get instanceof FunctionValue)) throw EngineException.ofType("Get accessor must be a function.");
+            if (set != null && !(set instanceof FunctionValue)) throw EngineException.ofType("Set accessor must be a function.");
+
+            if (!obj.defineProperty(
+                args.ctx, key,
+                (FunctionValue)get, (FunctionValue)set,
+                Values.toBoolean(Values.getMember(args.ctx, attrib, "configurable")),
+                Values.toBoolean(Values.getMember(args.ctx, attrib, "enumerable"))
+            )) throw EngineException.ofType("Can't define property '" + key + "'.");
+        }
+
+        return obj;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __defineProperties(Arguments args) {
+        var obj = args.convert(0, ObjectValue.class);
+        var attrib = args.get(1);
+
+        for (var key : Values.getMembers(null, attrib, false, false)) {
+            __defineProperty(new Arguments(args.ctx, null, obj, key, Values.getMember(args.ctx, attrib, key)));
+        }
+
+        return obj;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __keys(Arguments args) {
+        var obj = args.get(0);
+        var all = args.getBoolean(1);
+        var res = new ArrayValue();
+
+        for (var key : Values.getMembers(args.ctx, obj, true, false)) {
+            if (all || !(key instanceof Symbol)) res.set(args.ctx, res.size(), key);
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __entries(Arguments args) {
+        var res = new ArrayValue();
+        var obj = args.get(0);
+        var all = args.getBoolean(1);
+
+        for (var key : Values.getMembers(args.ctx, obj, true, false)) {
+            if (all || !(key instanceof Symbol)) res.set(args.ctx, res.size(), new ArrayValue(args.ctx, key, Values.getMember(args.ctx, obj, key)));
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __values(Arguments args) {
+        var res = new ArrayValue();
+        var obj = args.get(0);
+        var all = args.getBoolean(1);
+
+        for (var key : Values.getMembers(args.ctx, obj, true, false)) {
+            if (all || !(key instanceof Symbol)) res.set(args.ctx, res.size(), Values.getMember(args.ctx, obj, key));
+        }
+
+        return res;
+    }
+ 
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __getOwnPropertyDescriptor(Arguments args) {
+        return Values.getMemberDescriptor(args.ctx, args.get(0), args.get(1));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __getOwnPropertyDescriptors(Arguments args) {
+        var res = new ObjectValue();
+        var obj = args.get(0);
+        for (var key : Values.getMembers(args.ctx, obj, true, true)) {
+            res.defineProperty(args.ctx, key, Values.getMemberDescriptor(args.ctx, obj, key));
+        }
+        return res;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __getOwnPropertyNames(Arguments args) {
+        var res = new ArrayValue();
+        var obj = args.get(0);
+        var all = args.getBoolean(1);
+
+        for (var key : Values.getMembers(args.ctx, obj, true, true)) {
+            if (all || !(key instanceof Symbol)) res.set(args.ctx, res.size(), key);
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static ArrayValue __getOwnPropertySymbols(Arguments args) {
+        var obj = args.get(0);
+        var res = new ArrayValue();
+
+        for (var key : Values.getMembers(args.ctx, obj, true, true)) {
+            if (key instanceof Symbol) res.set(args.ctx, res.size(), key);
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __hasOwn(Arguments args) {
+        return Values.hasMember(args.ctx, args.get(0), args.get(1), true);
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __getPrototypeOf(Arguments args) {
+        return Values.getPrototype(args.ctx, args.get(0));
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __setPrototypeOf(Arguments args) {
+        Values.setPrototype(args.ctx, args.get(0), args.get(1));
+        return args.get(0);
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static ObjectValue __fromEntries(Arguments args) {
+        var res = new ObjectValue();
+
+        for (var el : Values.fromJSIterator(args.ctx, args.get(0))) {
+            if (el instanceof ArrayValue) {
+                res.defineProperty(args.ctx, ((ArrayValue)el).get(0), ((ArrayValue)el).get(1));
+            }
+        }
+
+        return res;
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __preventExtensions(Arguments args) {
+        if (args.get(0) instanceof ObjectValue) args.convert(0, ObjectValue.class).preventExtensions();
+        return args.get(0);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __seal(Arguments args) {
+        if (args.get(0) instanceof ObjectValue) args.convert(0, ObjectValue.class).seal();
+        return args.get(0);
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static Object __freeze(Arguments args) {
+        if (args.get(0) instanceof ObjectValue) args.convert(0, ObjectValue.class).freeze();
+        return args.get(0);
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isExtensible(Arguments args) {
+        var obj = args.get(0);
+        if (!(obj instanceof ObjectValue)) return false;
+        return ((ObjectValue)obj).extensible();
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isSealed(Arguments args) {
+        var obj = args.get(0);
+
+        if (!(obj instanceof ObjectValue)) return true;
+        var _obj = (ObjectValue)obj;
+
+        if (_obj.extensible()) return false;
+
+        for (var key : _obj.keys(true)) {
+            if (_obj.memberConfigurable(key)) return false;
+        }
+
+        return true;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static boolean __isFrozen(Arguments args) {
+        var obj = args.get(0);
+
+        if (!(obj instanceof ObjectValue)) return true;
+        var _obj = (ObjectValue)obj;
+
+        if (_obj.extensible()) return false;
+
+        for (var key : _obj.keys(true)) {
+            if (_obj.memberConfigurable(key)) return false;
+            if (_obj.memberWritable(key)) return false;
+        }
+
+        return true;
+    }
+
+    @Expose
+    public static Object __valueOf(Arguments args) {
+        return args.self;
+    }
+    @Expose
+    public static String __toString(Arguments args) {
+        var name = Values.getMember(args.ctx, args.self, Symbol.get("Symbol.typeName"));
+        if (name == null) name = "Unknown";
+        else name = Values.toString(args.ctx, name);
+
+        return "[object " + name + "]";
+    }
+    @Expose
+    public static boolean __hasOwnProperty(Arguments args) {
+        return Values.hasMember(args.ctx, args.self, args.get(0), true);
+    }
+
+    @ExposeConstructor
+    public static Object __constructor(Arguments args) {
+        var arg = args.get(0);
+        if (arg == null || arg == Values.NULL) return new ObjectValue();
+        else if (arg instanceof Boolean) return new BooleanLib((boolean)arg);
+        else if (arg instanceof Number) return new NumberLib(((Number)arg).doubleValue());
+        else if (arg instanceof String) return new StringLib((String)arg);
+        else if (arg instanceof Symbol) return new SymbolLib((Symbol)arg);
+        else return arg;
+    }
+}

src/java/me/topchetoeu/jscript/lib/PromiseLib.java

@@ -0,0 +1,404 @@
+package me.topchetoeu.jscript.lib;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import me.topchetoeu.jscript.common.ResultRunnable;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.EventLoop;
+import me.topchetoeu.jscript.runtime.Extensions;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("Promise")
+public class PromiseLib {
+    public static interface Handle {
+        void onFulfil(Object val);
+        void onReject(EngineException err);
+
+        default Handle defer(Extensions loop) {
+            var self = this;
+
+            return new Handle() {
+                @Override public void onFulfil(Object val) {
+                    if (!loop.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+                    loop.get(EventLoop.KEY).pushMsg(() -> self.onFulfil(val), true);
+                }
+                @Override public void onReject(EngineException val) {
+                    if (!loop.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+                    loop.get(EventLoop.KEY).pushMsg(() -> self.onReject(val), true);
+                }
+            };
+        }
+    }
+
+    private static final int STATE_PENDING = 0;
+    private static final int STATE_FULFILLED = 1;
+    private static final int STATE_REJECTED = 2;
+
+    private List<Handle> handles = new ArrayList<>();
+
+    private int state = STATE_PENDING;
+    private boolean handled = false;
+    private Object val;
+
+    private void resolveSynchronized(Context ctx, Object val, int newState) {
+        this.val = val;
+        this.state = newState;
+    
+        for (var handle : handles) {
+            if (newState == STATE_FULFILLED) handle.onFulfil(val);
+            if (newState == STATE_REJECTED) {
+                handle.onReject((EngineException)val);
+                handled = true;
+            }
+        }
+
+        if (state == STATE_REJECTED && !handled) {
+            Values.printError(((EngineException)val).setCtx(ctx), "(in promise)");
+        }
+
+        handles = null;
+
+        // ctx.get(EventLoop.KEY).pushMsg(() -> {
+        //     if (!ctx.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+
+
+        //     handles = null;
+        // }, true);
+        
+    }
+    private synchronized void resolve(Context ctx, Object val, int newState) {
+        if (this.state != STATE_PENDING || newState == STATE_PENDING) return;
+
+        handle(ctx, val, new Handle() {
+            @Override public void onFulfil(Object val) {
+                resolveSynchronized(ctx, val, newState);
+            }
+            @Override public void onReject(EngineException err) {
+                resolveSynchronized(ctx, val, STATE_REJECTED);
+            }
+        });
+    }
+
+    public synchronized void fulfill(Context ctx, Object val) {
+        resolve(ctx, val, STATE_FULFILLED);
+    }
+    public synchronized void reject(Context ctx, EngineException val) {
+        resolve(ctx, val, STATE_REJECTED);
+    }
+
+    private void handle(Handle handle) {
+        if (state == STATE_FULFILLED) handle.onFulfil(val);
+        else if (state == STATE_REJECTED) {
+            handle.onReject((EngineException)val);
+            handled = true;
+        }
+        else handles.add(handle);
+    }
+
+    @Override public String toString() {
+        if (state == STATE_PENDING) return "Promise (pending)";
+        else if (state == STATE_FULFILLED) return "Promise (fulfilled)";
+        else return "Promise (rejected)";
+    }
+
+    public PromiseLib() {
+        this.state = STATE_PENDING;
+        this.val = null;
+    }
+
+    public static PromiseLib await(Context ctx, ResultRunnable<Object> runner) {
+        var res = new PromiseLib();
+
+        new Thread(() -> {
+            try {
+                res.fulfill(ctx, runner.run());
+            }
+            catch (EngineException e) {
+                res.reject(ctx, e);
+            }
+            catch (Exception e) {
+                if (e instanceof InterruptException) throw e;
+                else {
+                    res.reject(ctx, EngineException.ofError("Native code failed with " + e.getMessage()));
+                }
+            }
+        }, "Promisifier").start();
+
+        return res;
+    }
+    public static PromiseLib await(Context ctx, Runnable runner) {
+        return await(ctx, () -> {
+            runner.run();
+            return null;
+        });
+    }
+
+    public static void handle(Context ctx, Object obj, Handle handle) {
+        if (Values.isWrapper(obj, PromiseLib.class)) {
+            var promise = Values.wrapper(obj, PromiseLib.class);
+            handle(ctx, promise, handle);
+            return;
+        }
+        if (obj instanceof PromiseLib) {
+            ((PromiseLib)obj).handle(handle);
+            return;
+        }
+
+        var rethrow = new boolean[1];
+
+        try {
+            var then = Values.getMember(ctx, obj, "then");
+
+            if (then instanceof FunctionValue) Values.call(ctx, then, obj,
+                new NativeFunction(args -> {
+                    try { handle.onFulfil(args.get(0)); }
+                    catch (Exception e) {
+                        rethrow[0] = true;
+                        throw e;
+                    }
+                    return null;
+                }),
+                new NativeFunction(args -> {
+                    try { handle.onReject(new EngineException(args.get(0))); }
+                    catch (Exception e) {
+                        rethrow[0] = true;
+                        throw e;
+                    }
+                    return null;
+                })
+            );
+            else handle.onFulfil(obj);
+
+            return;
+        }
+        catch (Exception e) {
+            if (rethrow[0]) throw e;
+        }
+
+        handle.onFulfil(obj);
+    }
+
+    public static PromiseLib ofResolved(Context ctx, Object value) {
+        var res = new PromiseLib();
+        res.fulfill(ctx, value);
+        return res;
+    }
+    public static PromiseLib ofRejected(Context ctx, EngineException value) {
+        var res = new PromiseLib();
+        res.reject(ctx, value);
+        return res;
+    }
+
+    @Expose(value = "resolve", target = ExposeTarget.STATIC)
+    public static PromiseLib __ofResolved(Arguments args) {
+        return ofResolved(args.ctx, args.get(0));
+    }
+    @Expose(value = "reject", target = ExposeTarget.STATIC)
+    public static PromiseLib __ofRejected(Arguments args) {
+        return ofRejected(args.ctx, new EngineException(args.get(0)).setCtx(args.ctx));
+    }
+
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __any(Arguments args) {
+        if (!(args.get(0) instanceof ArrayValue)) throw EngineException.ofType("Expected argument for any to be an array.");
+        var promises = args.convert(0, ArrayValue.class); 
+
+        if (promises.size() == 0) return ofRejected(args.ctx, EngineException.ofError("No promises passed to 'Promise.any'.").setCtx(args.ctx));
+        var n = new int[] { promises.size() };
+        var res = new PromiseLib();
+        var errors = new ArrayValue();
+
+        for (var i = 0; i < promises.size(); i++) {
+            var index = i;
+            var val = promises.get(i);
+            if (res.state != STATE_PENDING) break;
+
+            handle(args.ctx, val, new Handle() {
+                public void onFulfil(Object val) { res.fulfill(args.ctx, val); }
+                public void onReject(EngineException err) {
+                    errors.set(args.ctx, index, err.value);
+                    n[0]--;
+                    if (n[0] <= 0) res.reject(args.ctx, new EngineException(errors).setCtx(args.ctx));
+                }
+            });
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __race(Arguments args) {
+        if (!(args.get(0) instanceof ArrayValue)) throw EngineException.ofType("Expected argument for any to be an array.");
+        var promises = args.convert(0, ArrayValue.class);
+        var res = new PromiseLib();
+
+        for (var i = 0; i < promises.size(); i++) {
+            var val = promises.get(i);
+            if (res.state != STATE_PENDING) break;
+
+            handle(args.ctx, val, new Handle() {
+                @Override public void onFulfil(Object val) { res.fulfill(args.ctx, val); }
+                @Override public void onReject(EngineException err) { res.reject(args.ctx, err); }
+            });
+        }
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __all(Arguments args) {
+        if (!(args.get(0) instanceof ArrayValue)) throw EngineException.ofType("Expected argument for any to be an array.");
+        var promises = args.convert(0, ArrayValue.class); 
+        var n = new int[] { promises.size() };
+        var res = new PromiseLib();
+        var result = new ArrayValue();
+
+        for (var i = 0; i < promises.size(); i++) {
+            if (res.state != STATE_PENDING) break;
+
+            var index = i;
+            var val = promises.get(i);
+
+            handle(args.ctx, val, new Handle() {
+                @Override public void onFulfil(Object val) {
+                    result.set(args.ctx, index, val);
+                    n[0]--;
+                    if (n[0] <= 0) res.fulfill(args.ctx, result);
+                }
+                @Override public void onReject(EngineException err) {
+                    res.reject(args.ctx, err);
+                }
+            });
+        }
+
+        if (n[0] <= 0) res.fulfill(args.ctx, result);
+
+        return res;
+    }
+    @Expose(target = ExposeTarget.STATIC)
+    public static PromiseLib __allSettled(Arguments args) {
+        if (!(args.get(0) instanceof ArrayValue)) throw EngineException.ofType("Expected argument for any to be an array.");
+        var promises = args.convert(0, ArrayValue.class); 
+        var n = new int[] { promises.size() };
+        var res = new PromiseLib();
+        var result = new ArrayValue();
+
+        for (var i = 0; i < promises.size(); i++) {
+            if (res.state != STATE_PENDING) break;
+
+            var index = i;
+
+            handle(args.ctx, promises.get(i), new Handle() {
+                @Override public void onFulfil(Object val) {
+                    var desc = new ObjectValue();
+                    desc.defineProperty(args.ctx, "status", "fulfilled");
+                    desc.defineProperty(args.ctx, "value", val);
+
+                    result.set(args.ctx, index, desc);
+
+                    n[0]--;
+                    if (n[0] <= 0) res.fulfill(args.ctx, res);
+                }
+                @Override public void onReject(EngineException err) {
+                    var desc = new ObjectValue();
+                    desc.defineProperty(args.ctx, "status", "reject");
+                    desc.defineProperty(args.ctx, "value", err.value);
+
+                    result.set(args.ctx, index, desc);
+
+                    n[0]--;
+                    if (n[0] <= 0) res.fulfill(args.ctx, res);
+                }
+            });
+        }
+
+        if (n[0] <= 0) res.fulfill(args.ctx, result);
+
+        return res;
+    }
+
+    @Expose
+    public static Object __then(Arguments args) {
+        var onFulfill = args.get(0) instanceof FunctionValue ? args.convert(0, FunctionValue.class) : null;
+        var onReject = args.get(1) instanceof FunctionValue ? args.convert(1, FunctionValue.class) : null;
+
+        var res = new PromiseLib();
+
+        handle(args.ctx, args.self, new Handle() {
+            @Override public void onFulfil(Object val) {
+                try { res.fulfill(args.ctx, onFulfill.call(args.ctx, null, val)); }
+                catch (EngineException e) { res.reject(args.ctx, e); }
+            }
+            @Override public void onReject(EngineException err) {
+                try { res.fulfill(args.ctx, onReject.call(args.ctx, null, err.value)); }
+                catch (EngineException e) { res.reject(args.ctx, e); }
+            }
+        }.defer(args.ctx));
+
+        return res;
+    }
+    @Expose
+    public static Object __catch(Arguments args) {
+        return __then(new Arguments(args.ctx, args.self, null, args.get(0)));
+    }
+    @Expose
+    public static Object __finally(Arguments args) {
+        var func = args.get(0) instanceof FunctionValue ? args.convert(0, FunctionValue.class) : null;
+
+        var res = new PromiseLib();
+
+        handle(args.ctx, args.self, new Handle() {
+            @Override public void onFulfil(Object val) {
+                try {
+                    func.call(args.ctx);
+                    res.fulfill(args.ctx, val);
+                }
+                catch (EngineException e) { res.reject(args.ctx, e); }
+            }
+            @Override public void onReject(EngineException err) {
+                try {
+                    func.call(args.ctx);
+                    res.reject(args.ctx, err);
+                }
+                catch (EngineException e) { res.reject(args.ctx, e); }
+            }
+        }.defer(args.ctx));
+
+        return res;
+    }
+
+    @ExposeConstructor
+    public static PromiseLib __constructor(Arguments args) {
+        var func = args.convert(0, FunctionValue.class);
+        var res = new PromiseLib();
+
+        try {
+            func.call(
+                args.ctx, null,
+                new NativeFunction(null, _args -> {
+                    res.fulfill(_args.ctx, _args.get(0));
+                    return null;
+                }),
+                new NativeFunction(null, _args -> {
+                    res.reject(_args.ctx, new EngineException(_args.get(0)).setCtx(_args.ctx));
+                    return null;
+                })
+            );
+        }
+        catch (EngineException e) {
+            res.reject(args.ctx, e);
+        }
+
+        return res;
+    }
+}

src/java/me/topchetoeu/jscript/lib/RangeErrorLib.java

@@ -0,0 +1,19 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
+import me.topchetoeu.jscript.utils.interop.ExposeField;
+import me.topchetoeu.jscript.utils.interop.WrapperName;
+
+@WrapperName("RangeError")
+public class RangeErrorLib extends ErrorLib {
+    @ExposeField public static final String __name = "RangeError";
+
+    @ExposeConstructor public static ObjectValue constructor(Arguments args) {
+        var target = ErrorLib.__constructor(args);
+        target.setPrototype(PlaceholderProto.RANGE_ERROR);
+        return target;
+    }
+}