Merge pull request #8 from TopchetoEU/TopchetoEU/tests

Integrate typescript

.github/workflows/tagged-release.yml

@@ -14,6 +14,7 @@ jobs:
       - name: Clone repository
         uses: GuillaumeFalourd/clone-github-repo-action@main
         with:
+          branch: 'master' # fuck this political bullshitshit, took me an hour to fix this
           owner: 'TopchetoEU'
           repository: 'java-jscript'
       - name: "Build"

build.js

@@ -54,7 +54,7 @@ async function compileJava() {
             .replace('${AUTHOR}', conf.author)
         );
         const args = ['--release', '11', ];
-        if (argv[1] === 'debug') args.push('-g');
+        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);
@@ -69,7 +69,6 @@ async function compileJava() {
     try {
         try { await fs.rm('dst', { recursive: true }); } catch {}
         await copy('src', 'dst/classes', v => !v.endsWith('.java'));
-        await run('tsc', '-p', 'lib/tsconfig.json', '--outFile', 'dst/classes/me/topchetoeu/jscript/js/core.js'),
         await compileJava();
         await run('jar', '-c', '-f', 'dst/jscript.jar', '-e', 'me.topchetoeu.jscript.Main', '-C', 'dst/classes', '.');
     }

dead-code/debug/DebugServer.java

@@ -1,154 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.io.IOException;
-import java.net.InetSocketAddress;
-import java.net.ServerSocket;
-import java.net.Socket;
-import java.security.MessageDigest;
-import java.util.Base64;
-
-import me.topchetoeu.jscript.engine.Engine;
-import me.topchetoeu.jscript.engine.debug.WebSocketMessage.Type;
-import me.topchetoeu.jscript.engine.debug.handlers.DebuggerHandles;
-import me.topchetoeu.jscript.exceptions.SyntaxException;
-
-public class DebugServer {
-    public static String browserDisplayName = "jscript";
-    public static String targetName = "target";
-
-    public final Engine engine;
-
-    private static void send(Socket socket, String val) throws IOException {
-        Http.writeResponse(socket.getOutputStream(), 200, "OK", "application/json", val.getBytes());
-    }
-
-    // SILENCE JAVA
-    private MessageDigest getDigestInstance() {
-        try {
-            return MessageDigest.getInstance("sha1");
-        }
-        catch (Throwable a) { return null; }
-    }
-
-    private static Thread runAsync(Runnable func, String name) {
-        var res = new Thread(func);
-        res.setName(name);
-        res.start();
-        return res;
-    }
-
-    private void handle(WebSocket ws) throws InterruptedException, IOException {
-        WebSocketMessage raw;
-
-        while ((raw = ws.receive()) != null) {
-            if (raw.type != Type.Text) {
-                ws.send(new V8Error("Expected a text message."));
-                continue;
-            }
-
-            V8Message msg;
-
-            try {
-                msg = new V8Message(raw.textData());
-            }
-            catch (SyntaxException e) {
-                ws.send(new V8Error(e.getMessage()));
-                return;
-            }
-
-            switch (msg.name) {
-                case "Debugger.enable": DebuggerHandles.enable(msg, engine, ws); continue;
-                case "Debugger.disable": DebuggerHandles.disable(msg, engine, ws); continue;
-                case "Debugger.stepInto": DebuggerHandles.stepInto(msg, engine, ws); continue;
-            }
-        }
-    }
-    private void onWsConnect(HttpRequest req, Socket socket) throws IOException {
-        var key = req.headers.get("sec-websocket-key");
-
-        if (key == null) {
-            Http.writeResponse(
-                socket.getOutputStream(), 426, "Upgrade Required", "text/txt",
-                "Expected a WS upgrade".getBytes()
-            );
-            return;
-        }
-
-        var resKey = Base64.getEncoder().encodeToString(getDigestInstance().digest(
-            (key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").getBytes()
-        ));
-
-        Http.writeCode(socket.getOutputStream(), 101, "Switching Protocols");
-        Http.writeHeader(socket.getOutputStream(), "Connection", "Upgrade");
-        Http.writeHeader(socket.getOutputStream(), "Sec-WebSocket-Accept", resKey);
-        Http.writeLastHeader(socket.getOutputStream(), "Upgrade", "WebSocket");
-
-        var ws = new WebSocket(socket);
-
-        runAsync(() -> {
-            try {
-                handle(ws);
-            }
-            catch (InterruptedException e) { return; }
-            catch (IOException e) { e.printStackTrace(); }
-            finally { ws.close(); }
-        }, "Debug Server Message Reader");
-        runAsync(() -> {
-            try {
-                handle(ws);
-            }
-            catch (InterruptedException e) { return; }
-            catch (IOException e) { e.printStackTrace(); }
-            finally { ws.close(); }
-        }, "Debug Server Event Writer");
-    }
-
-    public void open(InetSocketAddress address) throws IOException {
-        ServerSocket server = new ServerSocket();
-        server.bind(address);
-
-        try {
-            while (true) {
-                var socket = server.accept();
-                var req = Http.readRequest(socket.getInputStream());
-
-                switch (req.path) {
-                    case "/json/version":
-                        send(socket, "{\"Browser\":\"" + browserDisplayName + "\",\"Protocol-Version\":\"1.2\"}");
-                        break;
-                    case "/json/list":
-                    case "/json":
-                        var addr = "ws://" + address.getHostString() + ":" + address.getPort() + "/devtools/page/" + targetName;
-                        send(socket, "{\"id\":\"" + browserDisplayName + "\",\"webSocketDebuggerUrl\":\"" + addr + "\"}");
-                        break;
-                    case "/json/new":
-                    case "/json/activate":
-                    case "/json/protocol":
-                    case "/json/close":
-                    case "/devtools/inspector.html":
-                        Http.writeResponse(
-                            socket.getOutputStream(),
-                            501, "Not Implemented", "text/txt",
-                            "This feature isn't (and won't be) implemented.".getBytes()
-                        );
-                        break;
-                    default:
-                        if (req.path.equals("/devtools/page/" + targetName)) onWsConnect(req, socket);
-                        else {
-                            Http.writeResponse(
-                                socket.getOutputStream(),
-                                404, "Not Found", "text/txt",
-                                "Not found :/".getBytes()
-                            );
-                        }
-                        break;
-                }
-            }
-        }
-        finally { server.close(); }
-    }
-
-    public DebugServer(Engine engine) {
-        this.engine = engine;
-    }
-}

dead-code/debug/DebugState.java

@@ -1,52 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.engine.BreakpointData;
-import me.topchetoeu.jscript.engine.DebugCommand;
-import me.topchetoeu.jscript.engine.frame.CodeFrame;
-import me.topchetoeu.jscript.events.Event;
-
-public class DebugState {
-    private boolean paused = false;
-
-    public final HashSet<Location> breakpoints = new HashSet<>();
-    public final List<CodeFrame> frames = new ArrayList<>();
-    public final Map<String, String> sources = new HashMap<>();
-
-    public final Event<BreakpointData> breakpointNotifier = new Event<>();
-    public final Event<DebugCommand> commandNotifier = new Event<>();
-    public final Event<String> sourceAdded = new Event<>();
-
-    public DebugState pushFrame(CodeFrame frame) {
-        frames.add(frame);
-        return this;
-    }
-    public DebugState popFrame() {
-        if (frames.size() > 0) frames.remove(frames.size() - 1);
-        return this;
-    }
-
-    public DebugCommand pause(BreakpointData data) throws InterruptedException {
-        paused = true;
-        breakpointNotifier.next(data);
-        return commandNotifier.toAwaitable().await();
-    }
-    public void resume(DebugCommand command) {
-        paused = false;
-        commandNotifier.next(command);
-    }
-
-    // public void addSource()?
-
-    public boolean paused() { return paused; }
-
-    public boolean isBreakpoint(Location loc) {
-        return breakpoints.contains(loc);
-    }
-}

dead-code/debug/Http.java

@@ -1,65 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.util.HashMap;
-import java.util.IllegalFormatException;
-
-// We dont need no http library
-public class Http {
-    public static void writeCode(OutputStream str, int code, String name) throws IOException {
-        str.write(("HTTP/1.1 " + code + " " + name + "\r\n").getBytes());
-    }
-    public static void writeHeader(OutputStream str, String name, String value) throws IOException {
-        str.write((name + ": " + value + "\r\n").getBytes());
-    }
-    public static void writeLastHeader(OutputStream str, String name, String value) throws IOException {
-        str.write((name + ": " + value + "\r\n").getBytes());
-        writeHeadersEnd(str);
-    }
-    public static void writeHeadersEnd(OutputStream str) throws IOException {
-        str.write("\n".getBytes());
-    }
-
-    public static void writeResponse(OutputStream str, int code, String name, String type, byte[] data) throws IOException {
-        writeCode(str, code, name);
-        writeHeader(str, "Content-Type", type);
-        writeLastHeader(str, "Content-Length", data.length + "");
-        str.write(data);
-        str.close();
-    }
-
-    public static HttpRequest readRequest(InputStream str) throws IOException {
-        var lines = new BufferedReader(new InputStreamReader(str));
-        var line = lines.readLine();
-        var i1 = line.indexOf(" ");
-        var i2 = line.lastIndexOf(" ");
-
-        var method = line.substring(0, i1).trim().toUpperCase();
-        var path = line.substring(i1 + 1, i2).trim();
-        var headers = new HashMap<String, String>();
-
-        while (!(line = lines.readLine()).isEmpty()) {
-            var i = line.indexOf(":");
-            if (i < 0) continue;
-            var name = line.substring(0, i).trim().toLowerCase();
-            var value = line.substring(i + 1).trim();
-
-            if (name.length() == 0) continue;
-            headers.put(name, value);
-        }
-
-        if (headers.containsKey("content-length")) {
-            try {
-                var i = Integer.parseInt(headers.get("content-length"));
-                str.skip(i);
-            }
-            catch (IllegalFormatException e) { /* ¯\_(ツ)_/¯ */ }
-        }
-
-        return new HttpRequest(method, path, headers);
-    }
-}

dead-code/debug/HttpRequest.java

@@ -1,16 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.util.Map;
-
-public class HttpRequest {
-    public final String method;
-    public final String path;
-    public final Map<String, String> headers;
-
-    public HttpRequest(String method, String path, Map<String, String> headers) {
-        this.method = method;
-        this.path = path;
-        this.headers = headers;
-    }
-}
-

dead-code/debug/WebSocket.java

@@ -1,185 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.net.Socket;
-
-import me.topchetoeu.jscript.engine.debug.WebSocketMessage.Type;
-
-public class WebSocket implements AutoCloseable {
-    public long maxLength = 2000000;
-
-    private Socket socket;
-    private boolean closed = false;
-
-    private OutputStream out() throws IOException {
-        return socket.getOutputStream();
-    }
-    private InputStream in() throws IOException {
-        return socket.getInputStream();
-    }
-
-    private long readLen(int byteLen) throws IOException {
-        long res = 0;
-
-        if (byteLen == 126) {
-            res |= in().read() << 8;
-            res |= in().read();
-            return res;
-        }
-        else if (byteLen == 127) {
-            res |= in().read() << 56;
-            res |= in().read() << 48;
-            res |= in().read() << 40;
-            res |= in().read() << 32;
-            res |= in().read() << 24;
-            res |= in().read() << 16;
-            res |= in().read() << 8;
-            res |= in().read();
-            return res;
-        }
-        else return byteLen;
-    }
-    private byte[] readMask(boolean has) throws IOException {
-        if (has) {
-            return new byte[] {
-                (byte)in().read(),
-                (byte)in().read(),
-                (byte)in().read(),
-                (byte)in().read()
-            };
-        }
-        else return new byte[4];
-    }
-
-    private void writeLength(long len) throws IOException {
-        if (len < 126) {
-            out().write((int)len);
-        }
-        else if (len < 0xFFFF) {
-            out().write(126);
-            out().write((int)(len >> 8) & 0xFF);
-            out().write((int)len & 0xFF);
-        }
-        else {
-            out().write(127);
-            out().write((int)(len >> 56) & 0xFF);
-            out().write((int)(len >> 48) & 0xFF);
-            out().write((int)(len >> 40) & 0xFF);
-            out().write((int)(len >> 32) & 0xFF);
-            out().write((int)(len >> 24) & 0xFF);
-            out().write((int)(len >> 16) & 0xFF);
-            out().write((int)(len >> 8) & 0xFF);
-            out().write((int)len & 0xFF);
-        }
-    }
-    private synchronized void write(int type, byte[] data) throws IOException {
-        out().write(type | 0x80);
-        writeLength(data.length);
-        for (int i = 0; i < data.length; i++) {
-            out().write(data[i]);
-        }
-    }
-
-    public void send(String data) throws IOException {
-        if (closed) throw new IllegalStateException("Object is closed.");
-        write(1, data.getBytes());
-    }
-    public void send(byte[] data) throws IOException {
-        if (closed) throw new IllegalStateException("Object is closed.");
-        write(2, data);
-    }
-    public void send(WebSocketMessage msg) throws IOException {
-        if (msg.type == Type.Binary) send(msg.binaryData());
-        else send(msg.textData());
-    }
-    public void send(Object data) throws IOException {
-        if (closed) throw new IllegalStateException("Object is closed.");
-        write(1, data.toString().getBytes());
-    }
-
-    public void close(String reason) {
-        if (socket != null) {
-            try { write(8, reason.getBytes()); } catch (IOException e) { /* ¯\_(ツ)_/¯ */ }
-            try { socket.close(); } catch (IOException e) { e.printStackTrace(); }
-        }
-
-        socket = null;
-        closed = true;
-    }
-    public void close() {
-        close("");
-    }
-
-    private WebSocketMessage fail(String reason) {
-        System.out.println("WebSocket Error: " + reason);
-        close(reason);
-        return null;
-    }
-
-    private byte[] readData() throws IOException {
-        var maskLen = in().read();
-        var hasMask = (maskLen & 0x80) != 0;
-        var len = (int)readLen(maskLen & 0x7F);
-        var mask = readMask(hasMask);
-
-        if (len > maxLength) fail("WebSocket Error: client exceeded configured max message size");
-        else {
-            var buff = new byte[len];
-
-            if (in().read(buff) < len) fail("WebSocket Error: payload too short");
-            else {
-                for (int i = 0; i < len; i++) {
-                    buff[i] ^= mask[(int)(i % 4)];
-                }
-                return buff;
-            }
-        }
-
-        return null;
-    }
-
-    public WebSocketMessage receive() throws InterruptedException {
-        try {
-            var data = new ByteArrayOutputStream();
-            var type = 0;
-
-            while (socket != null && !closed) {
-                var finId = in().read();
-                var fin = (finId & 0x80) != 0;
-                int id = finId & 0x0F;
-
-                if (id == 0x8) { close(); return null; }
-                if (id >= 0x8) {
-                    if (!fin) return fail("WebSocket Error: client-sent control frame was fragmented");
-                    if (id == 0x9) write(0xA, data.toByteArray());
-                    continue;
-                }
-
-                if (type == 0) type = id;
-                if (type == 0) return fail("WebSocket Error: client used opcode 0x00 for first fragment");
-
-                var buff = readData();
-                if (buff == null) break;
-
-                if (data.size() + buff.length > maxLength) return fail("WebSocket Error: client exceeded configured max message size");
-                data.write(buff);
-
-                if (!fin) continue;
-                var raw = data.toByteArray();
-
-                if (type == 1) return new WebSocketMessage(new String(raw));
-                else return new WebSocketMessage(raw);
-            }
-        }
-        catch (IOException e) { close(); }
-
-        return null;
-    }
-
-    public WebSocket(Socket socket) {
-        this.socket = socket;
-    }
-}

dead-code/debug/handlers/DebuggerHandles.java

@@ -1,29 +0,0 @@
-package me.topchetoeu.jscript.engine.debug.handlers;
-
-import java.io.IOException;
-
-import me.topchetoeu.jscript.engine.DebugCommand;
-import me.topchetoeu.jscript.engine.Engine;
-import me.topchetoeu.jscript.engine.debug.V8Error;
-import me.topchetoeu.jscript.engine.debug.V8Message;
-import me.topchetoeu.jscript.engine.debug.WebSocket;
-import me.topchetoeu.jscript.json.JSONMap;
-
-public class DebuggerHandles {
-    public static void enable(V8Message msg, Engine engine, WebSocket ws) throws IOException {
-        if (engine.debugState == null) ws.send(new V8Error("Debugging is disabled for this engine."));
-        else ws.send(msg.respond(new JSONMap().set("debuggerId", 1)));
-    }
-    public static void disable(V8Message msg, Engine engine, WebSocket ws) throws IOException {
-        if (engine.debugState == null) ws.send(msg.respond());
-        else ws.send(new V8Error("Debugger may not be disabled."));
-    }
-    public static void stepInto(V8Message msg, Engine engine, WebSocket ws) throws IOException {
-        if (engine.debugState == null) ws.send(new V8Error("Debugging is disabled for this engine."));
-        else if (!engine.debugState.paused()) ws.send(new V8Error("Debugger is not paused."));
-        else {
-            engine.debugState.resume(DebugCommand.STEP_INTO);
-            ws.send(msg.respond());
-        }
-    }
-}

dead-code/modules/FileModuleProvider.java

@@ -1,50 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.nio.file.Path;
-
-import me.topchetoeu.jscript.polyfills.PolyfillEngine;
-
-public class FileModuleProvider implements ModuleProvider {
-    public File root;
-    public final boolean allowOutside;
-
-    private boolean checkInside(Path modFile) {
-        return modFile.toAbsolutePath().startsWith(root.toPath().toAbsolutePath());
-    }
-
-    @Override
-    public Module getModule(File cwd, String name) {
-        var realName = getRealName(cwd, name);
-        if (realName == null) return null;
-        var path = Path.of(realName + ".js").normalize();
-
-        try {
-            var res = PolyfillEngine.streamToString(new FileInputStream(path.toFile()));
-            return new Module(realName, path.toString(), res);
-        }
-        catch (IOException e) {
-            return null;
-        }
-    }
-    @Override
-    public String getRealName(File cwd, String name) {
-        var path = Path.of(".", Path.of(cwd.toString(), name).normalize().toString());
-        var fileName = path.getFileName().toString();
-        if (fileName == null) return null;
-        if (!fileName.equals("index") && path.toFile().isDirectory()) return getRealName(cwd, name + "/index");
-        path = Path.of(path.toString() + ".js");
-        if (!allowOutside && !checkInside(path)) return null;
-        if (!path.toFile().isFile() || !path.toFile().canRead()) return null;
-        var res = path.toString().replace('\\', '/');
-        var i = res.lastIndexOf('.');
-        return res.substring(0, i);
-    }
-
-    public FileModuleProvider(File root, boolean allowOutside) {
-        this.root = root.toPath().normalize().toFile();
-        this.allowOutside = allowOutside;
-    }
-}

dead-code/modules/Module.java

@@ -1,57 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-
-import me.topchetoeu.jscript.engine.CallContext;
-import me.topchetoeu.jscript.engine.CallContext.DataKey;
-import me.topchetoeu.jscript.engine.scope.Variable;
-import me.topchetoeu.jscript.engine.values.ObjectValue;
-import me.topchetoeu.jscript.interop.NativeGetter;
-import me.topchetoeu.jscript.interop.NativeSetter;
-
-public class Module {
-    public class ExportsVariable implements Variable {
-        @Override
-        public boolean readonly() { return false; }
-        @Override
-        public Object get(CallContext ctx) { return exports; }
-        @Override
-        public void set(CallContext ctx, Object val) { exports = val; }
-    }
-
-    public static DataKey<Module> KEY = new DataKey<>();
-
-    public final String filename;
-    public final String source;
-    public final String name;
-    private Object exports = new ObjectValue();
-    private boolean executing = false;
-
-    @NativeGetter("name")
-    public String name() { return name; }
-    @NativeGetter("exports")
-    public Object exports() { return exports; }
-    @NativeSetter("exports")
-    public void setExports(Object val) { exports = val; }
-
-    public void execute(CallContext ctx) throws InterruptedException {
-        if (executing) return;
-
-        executing = true;
-        var scope = ctx.engine().global().globalChild();
-        scope.define(null, "module", true, this);
-        scope.define("exports", new ExportsVariable());
-
-        var parent = new File(filename).getParentFile();
-        if (parent == null) parent = new File(".");
-
-        ctx.engine().compile(scope, filename, source).call(ctx.copy().setData(KEY, this), null);
-        executing = false;
-    }
-
-    public Module(String name, String filename, String source) {
-        this.name = name;
-        this.filename = filename;
-        this.source = source;
-    }
-}

dead-code/modules/ModuleManager.java

@@ -1,80 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-
-import me.topchetoeu.jscript.engine.CallContext;
-
-public class ModuleManager {
-    private final List<ModuleProvider> providers = new ArrayList<>();
-    private final HashMap<String, Module> cache = new HashMap<>();
-    public final FileModuleProvider files;
-
-    public void addProvider(ModuleProvider provider) {
-        this.providers.add(provider);
-    }
-
-    public boolean isCached(File cwd, String name) {
-        name = name.replace("\\", "/");
-
-        // Absolute paths are forbidden
-        if (name.startsWith("/")) return false;
-        // Look for files if we have a relative path
-        if (name.startsWith("../") || name.startsWith("./")) {
-            var realName = files.getRealName(cwd, name);
-            if (cache.containsKey(realName)) return true;
-            else return false;
-        }
-
-        for (var provider : providers) {
-            var realName = provider.getRealName(cwd, name);
-            if (realName == null) continue;
-            if (cache.containsKey(realName)) return true;
-        }
-
-        return false;
-    }
-    public Module tryLoad(CallContext ctx, String name) throws InterruptedException {
-        name = name.replace('\\', '/');
-
-        var pcwd = Path.of(".");
-
-        if (ctx.hasData(Module.KEY)) {
-            pcwd = Path.of(((Module)ctx.getData(Module.KEY)).filename).getParent();
-            if (pcwd == null) pcwd = Path.of(".");
-        }
-
-
-        var cwd = pcwd.toFile();
-
-        if (name.startsWith("/")) return null;
-        if (name.startsWith("../") || name.startsWith("./")) {
-            var realName = files.getRealName(cwd, name);
-            if (realName == null) return null;
-            if (cache.containsKey(realName)) return cache.get(realName);
-            var mod = files.getModule(cwd, name);
-            cache.put(mod.name(), mod);
-            mod.execute(ctx);
-            return mod;
-        }
-
-        for (var provider : providers) {
-            var realName = provider.getRealName(cwd, name);
-            if (realName == null) continue;
-            if (cache.containsKey(realName)) return cache.get(realName);
-            var mod = provider.getModule(cwd, name);
-            cache.put(mod.name(), mod);
-            mod.execute(ctx);
-            return mod;
-        }
-
-        return null;
-    }
-
-    public ModuleManager(File root) {
-        files = new FileModuleProvider(root, false);
-    }
-}

dead-code/modules/ModuleProvider.java

@@ -1,9 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-
-public interface ModuleProvider {
-    Module getModule(File cwd, String name);
-    String getRealName(File cwd, String name);
-    default boolean hasModule(File cwd, String name) { return getRealName(cwd, name) != null; }
-}

lib/core.ts

@@ -1,71 +0,0 @@
-interface Environment {
-    global: typeof globalThis & Record<string, any>;
-    proto(name: string): object;
-    setProto(name: string, val: object): void;
-}
-interface Internals {
-    markSpecial(...funcs: Function[]): void;
-    getEnv(func: Function): Environment | undefined;
-    setEnv<T>(func: T, env: Environment): T;
-    apply(func: Function, thisArg: any, args: any[]): any;
-    delay(timeout: number, callback: Function): () => void;
-    pushMessage(micro: boolean, func: Function, thisArg: any, args: any[]): void;
-
-    strlen(val: string): number;
-    char(val: string): number;
-    stringFromStrings(arr: string[]): string;
-    stringFromChars(arr: number[]): string;
-    symbol(name?: string): symbol;
-    symbolToString(sym: symbol): string;
-
-    isArray(obj: any): boolean;
-    generator(func: (_yield: <T>(val: T) => unknown) => (...args: any[]) => unknown): GeneratorFunction;
-    defineField(obj: object, key: any, val: any, writable: boolean, enumerable: boolean, configurable: boolean): boolean;
-    defineProp(obj: object, key: any, get: Function | undefined, set: Function | undefined, enumerable: boolean, configurable: boolean): boolean;
-    keys(obj: object, onlyString: boolean): any[];
-    ownProp(obj: any, key: string): PropertyDescriptor<any, any>;
-    ownPropKeys(obj: any): any[];
-    lock(obj: object, type: 'ext' | 'seal' | 'freeze'): void;
-    extensible(obj: object): boolean;
-
-    sort(arr: any[], comaprator: (a: any, b: any) => number): void;
-
-    constructor: {
-        log(...args: any[]): void;
-    }
-}
-
-var env: Environment = arguments[0], internals: Internals = arguments[1];
-globalThis.log = internals.constructor.log;
-
-try {
-    run('values/object');
-    run('values/symbol');
-    run('values/function');
-    run('values/errors');
-    run('values/string');
-    run('values/number');
-    run('values/boolean');
-    run('values/array');
-    run('promise');
-    run('map');
-    run('set');
-    run('regex');
-    run('timeout');
-
-    env.global.log = log;
-
-    log('Loaded polyfills!');
-}
-catch (e: any) {
-    let err = 'Uncaught error while loading polyfills: ';
-
-    if (typeof Error !== 'undefined' && e instanceof Error && e.toString !== {}.toString) err += e;
-    else if ('message' in e) {
-        if ('name' in e) err += e.name + ": " + e.message;
-        else err += 'Error: ' + e.message;
-    }
-    else err += e;
-
-    log(e);
-}

lib/map.ts

@@ -1,93 +0,0 @@
-define("map", () => {
-    const syms = { values: internals.symbol('Map.values') } as { readonly values: unique symbol };
-    const Object = env.global.Object;
-
-    class Map<KeyT, ValueT> {
-        [syms.values]: any = {};
-
-        public [env.global.Symbol.iterator](): IterableIterator<[KeyT, ValueT]> {
-            return this.entries();
-        }
-
-        public clear() {
-            this[syms.values] = {};
-        }
-        public delete(key: KeyT) {
-            if ((key as any) in this[syms.values]) {
-                delete this[syms.values];
-                return true;
-            }
-            else return false;
-        }
-
-        public entries(): IterableIterator<[KeyT, ValueT]> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: [ keys[i], this[syms.values][keys[i++]] ] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public keys(): IterableIterator<KeyT> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: keys[i] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public values(): IterableIterator<ValueT> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: this[syms.values][keys[i++]] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-
-        public get(key: KeyT) {
-            return this[syms.values][key];
-        }
-        public set(key: KeyT, val: ValueT) {
-            this[syms.values][key] = val;
-            return this;
-        }
-        public has(key: KeyT) {
-            return (key as any) in this[syms.values][key];
-        }
-
-        public get size() {
-            return internals.ownPropKeys(this[syms.values]).length;
-        }
-
-        public forEach(func: (key: KeyT, val: ValueT, map: Map<KeyT, ValueT>) => void, thisArg?: any) {
-            const keys = internals.ownPropKeys(this[syms.values]);
-
-            for (let i = 0; i < keys.length; i++) {
-                func(keys[i], this[syms.values][keys[i]], this);
-            }
-        }
-
-        public constructor(iterable: Iterable<[KeyT, ValueT]>) {
-            const it = iterable[env.global.Symbol.iterator]();
-
-            for (let el = it.next(); !el.done; el = it.next()) {
-                this[syms.values][el.value[0]] = el.value[1];
-            }
-        }
-    }
-
-    env.global.Map = Map;
-});

lib/modules.ts

@@ -1,13 +0,0 @@
-var { define, run } = (() => {
-    const modules: Record<string, Function> = {};
-
-    function define(name: string, func: Function) {
-        modules[name] = func;
-    }
-    function run(name: string) {
-        if (typeof modules[name] === 'function') return modules[name]();
-        else throw "The module '" + name + "' doesn't exist.";
-    }
-
-    return { define, run };
-})();

lib/promise.ts

@@ -1,203 +0,0 @@
-define("promise", () => {
-    const syms = {
-        callbacks: internals.symbol('Promise.callbacks'),
-        state: internals.symbol('Promise.state'),
-        value: internals.symbol('Promise.value'),
-        handled: internals.symbol('Promise.handled'),
-    } as {
-        readonly callbacks: unique symbol,
-        readonly state: unique symbol,
-        readonly value: unique symbol,
-        readonly handled: unique symbol,
-    }
-
-    type Callback<T> = [ PromiseFulfillFunc<T>, PromiseRejectFunc ];
-    enum State {
-        Pending,
-        Fulfilled,
-        Rejected,
-    }
-
-    function isAwaitable(val: unknown): val is Thenable<any> {
-        return (
-            typeof val === 'object' &&
-            val !== null &&
-            'then' in val &&
-            typeof val.then === 'function'
-        );
-    }
-    function resolve(promise: Promise<any>, v: any, state: State) {
-        if (promise[syms.state] === State.Pending) {
-            if (typeof v === 'object' && v !== null && 'then' in v && typeof v.then === 'function') {
-                v.then(
-                    (res: any) => resolve(promise, res, state),
-                    (res: any) => resolve(promise, res, State.Rejected)
-                );
-                return;
-            }
-            promise[syms.value] = v;
-            promise[syms.state] = state;
-
-            for (let i = 0; i < promise[syms.callbacks]!.length; i++) {
-                promise[syms.handled] = true;
-                promise[syms.callbacks]![i][state - 1](v);
-            }
-
-            promise[syms.callbacks] = undefined;
-
-            internals.pushMessage(true, internals.setEnv(() => {
-                if (!promise[syms.handled] && state === State.Rejected) {
-                    log('Uncaught (in promise) ' + promise[syms.value]);
-                }
-            }, env), undefined, []);
-        }
-    }
-
-    class Promise<T> {
-        public static isAwaitable(val: unknown): val is Thenable<any> {
-            return isAwaitable(val);
-        }
-
-        public static resolve<T>(val: T): Promise<Awaited<T>> {
-            return new Promise(res => res(val as any));
-        }
-        public static reject<T>(val: T): Promise<Awaited<T>> {
-            return new Promise((_, rej) => rej(val as any));
-        }
-
-        public static race<T>(vals: T[]): Promise<Awaited<T>> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.race is not variadic.');
-            return new Promise((res, rej) => {
-                for (let i = 0; i < vals.length; i++) {
-                    const val = vals[i];
-                    if (this.isAwaitable(val)) val.then(res, rej);
-                    else res(val as any);
-                }
-            });
-        }
-        public static any<T>(vals: T[]): Promise<Awaited<T>> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.any is not variadic.');
-            return new Promise((res, rej) => {
-                let n = 0;
-
-                for (let i = 0; i < vals.length; i++) {
-                    const val = vals[i];
-                    if (this.isAwaitable(val)) val.then(res, (err) => {
-                        n++;
-                        if (n === vals.length) throw Error('No promise resolved.');
-                    });
-                    else res(val as any);
-                }
-
-                if (vals.length === 0) throw Error('No promise resolved.');
-            });
-        }
-        public static all(vals: any[]): Promise<any[]> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.all is not variadic.');
-            return new Promise((res, rej) => {
-                const result: any[] = [];
-                let n = 0;
-
-                for (let i = 0; i < vals.length; i++) {
-                    const val = vals[i];
-                    if (this.isAwaitable(val)) val.then(
-                        val => {
-                            n++;
-                            result[i] = val;
-                            if (n === vals.length) res(result);
-                        },
-                        rej
-                    );
-                    else {
-                        n++;
-                        result[i] = val;
-                    }
-                }
-
-                if (vals.length === n) res(result);
-            });
-        }
-        public static allSettled(vals: any[]): Promise<any[]> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.allSettled is not variadic.');
-            return new Promise((res, rej) => {
-                const result: any[] = [];
-                let n = 0;
-
-                for (let i = 0; i < vals.length; i++) {
-                    const value = vals[i];
-                    if (this.isAwaitable(value)) value.then(
-                        value => {
-                            n++;
-                            result[i] = { status: 'fulfilled', value };
-                            if (n === vals.length) res(result);
-                        },
-                        reason => {
-                            n++;
-                            result[i] = { status: 'rejected', reason };
-                            if (n === vals.length) res(result);
-                        },
-                    );
-                    else {
-                        n++;
-                        result[i] = { status: 'fulfilled', value };
-                    }
-                }
-
-                if (vals.length === n) res(result);
-            });
-        }
-
-        [syms.callbacks]?: Callback<T>[] = [];
-        [syms.handled] = false;
-        [syms.state] = State.Pending;
-        [syms.value]?: T | unknown;
-
-        public then(onFulfil?: PromiseFulfillFunc<T>, onReject?: PromiseRejectFunc) {
-            return new Promise((resolve, reject) => {
-                onFulfil ??= v => v;
-                onReject ??= v => v;
-
-                const callback = (func: (val: any) => any) => (v: any) => {
-                    try { resolve(func(v)); }
-                    catch (e) { reject(e); }
-                }
-                switch (this[syms.state]) {
-                    case State.Pending:
-                        this[syms.callbacks]![this[syms.callbacks]!.length] = [callback(onFulfil), callback(onReject)];
-                        break;
-                    case State.Fulfilled:
-                        this[syms.handled] = true;
-                        callback(onFulfil)(this[syms.value]);
-                        break;
-                    case State.Rejected:
-                        this[syms.handled] = true;
-                        callback(onReject)(this[syms.value]);
-                        break;
-                }
-            })
-        }
-        public catch(func: PromiseRejectFunc) {
-            return this.then(undefined, func);
-        }
-        public finally(func: () => void) {
-            return this.then(
-                v => {
-                    func();
-                    return v;
-                },
-                v => {
-                    func();
-                    throw v;
-                }
-            );
-        }
-
-        public constructor(func: PromiseFunc<T>) {
-            internals.pushMessage(true, func, undefined, [
-                ((v) => resolve(this, v, State.Fulfilled)) as PromiseFulfillFunc<T>,
-                ((err) => resolve(this, err, State.Rejected)) as PromiseRejectFunc
-            ]);
-        }
-    }
-    env.global.Promise = Promise as any;
-});

lib/regex.ts

@@ -1,143 +0,0 @@
-define("regex", () => {
-    // var RegExp = env.global.RegExp = env.internals.RegExp;
-
-    // setProps(RegExp.prototype as RegExp, env, {
-    //     [Symbol.typeName]: 'RegExp',
-    
-    //     test(val) {
-    //         return !!this.exec(val);
-    //     },
-    //     toString() {
-    //         return '/' + this.source + '/' + this.flags;
-    //     },
-    
-    //     [Symbol.match](target) {
-    //         if (this.global) {
-    //             const res: string[] = [];
-    //             let val;
-    //             while (val = this.exec(target)) {
-    //                 res.push(val[0]);
-    //             }
-    //             this.lastIndex = 0;
-    //             return res;
-    //         }
-    //         else {
-    //             const res = this.exec(target);
-    //             if (!this.sticky) this.lastIndex = 0;
-    //             return res;
-    //         }
-    //     },
-    //     [Symbol.matchAll](target) {
-    //         let pattern: RegExp | undefined = new this.constructor(this, this.flags + "g") as RegExp;
-    
-    //         return {
-    //             next: (): IteratorResult<RegExpResult, undefined> => {
-    //                 const val = pattern?.exec(target);
-    
-    //                 if (val === null || val === undefined) {
-    //                     pattern = undefined;
-    //                     return { done: true };
-    //                 }
-    //                 else return { value: val };
-    //             },
-    //             [Symbol.iterator]() { return this; }
-    //         }
-    //     },
-    //     [Symbol.split](target, limit, sensible) {
-    //         const pattern = new this.constructor(this, this.flags + "g") as RegExp;
-    //         let match: RegExpResult | null;
-    //         let lastEnd = 0;
-    //         const res: string[] = [];
-    
-    //         while ((match = pattern.exec(target)) !== null) {
-    //             let added: string[] = [];
-    
-    //             if (match.index >= target.length) break;
-    
-    //             if (match[0].length === 0) {
-    //                 added = [ target.substring(lastEnd, pattern.lastIndex), ];
-    //                 if (pattern.lastIndex < target.length) added.push(...match.slice(1));
-    //             }
-    //             else if (match.index - lastEnd > 0) {
-    //                 added = [ target.substring(lastEnd, match.index), ...match.slice(1) ];
-    //             }
-    //             else {
-    //                 for (let i = 1; i < match.length; i++) {
-    //                     res[res.length - match.length + i] = match[i];
-    //                 }
-    //             }
-    
-    //             if (sensible) {
-    //                 if (limit !== undefined && res.length + added.length >= limit) break;
-    //                 else res.push(...added);
-    //             }
-    //             else {
-    //                 for (let i = 0; i < added.length; i++) {
-    //                     if (limit !== undefined && res.length >= limit) return res;
-    //                     else res.push(added[i]);
-    //                 }
-    //             }
-    
-    //             lastEnd = pattern.lastIndex;
-    //         }
-    
-    //         if (lastEnd < target.length) {
-    //             res.push(target.substring(lastEnd));
-    //         }
-    
-    //         return res;
-    //     },
-    //     [Symbol.replace](target, replacement) {
-    //         const pattern = new this.constructor(this, this.flags + "d") as RegExp;
-    //         let match: RegExpResult | null;
-    //         let lastEnd = 0;
-    //         const res: string[] = [];
-    
-    //         // log(pattern.toString());
-    
-    //         while ((match = pattern.exec(target)) !== null) {
-    //             const indices = match.indices![0];
-    //             res.push(target.substring(lastEnd, indices[0]));
-    //             if (replacement instanceof Function) {
-    //                 res.push(replacement(target.substring(indices[0], indices[1]), ...match.slice(1), indices[0], target));
-    //             }
-    //             else {
-    //                 res.push(replacement);
-    //             }
-    //             lastEnd = indices[1];
-    //             if (!pattern.global) break;
-    //         }
-    
-    //         if (lastEnd < target.length) {
-    //             res.push(target.substring(lastEnd));
-    //         }
-    
-    //         return res.join('');
-    //     },
-    //     [Symbol.search](target, reverse, start) {
-    //         const pattern: RegExp | undefined = new this.constructor(this, this.flags + "g") as RegExp;
-    
-            
-    //         if (!reverse) {
-    //             pattern.lastIndex = (start as any) | 0;
-    //             const res = pattern.exec(target);
-    //             if (res) return res.index;
-    //             else return -1;
-    //         }
-    //         else {
-    //             start ??= target.length;
-    //             start |= 0;
-    //             let res: RegExpResult | null = null;
-    
-    //             while (true) {
-    //                 const tmp = pattern.exec(target);
-    //                 if (tmp === null || tmp.index > start) break;
-    //                 res = tmp;
-    //             }
-    
-    //             if (res && res.index <= start) return res.index;
-    //             else return -1;
-    //         }
-    //     },
-    // });
-});

lib/set.ts

@@ -1,81 +0,0 @@
-define("set", () => {
-    const syms = { values: internals.symbol('Map.values') } as { readonly values: unique symbol };
-    const Object = env.global.Object;
-
-    class Set<T> {
-        [syms.values]: any = {};
-
-        public [env.global.Symbol.iterator](): IterableIterator<[T, T]> {
-            return this.entries();
-        }
-
-        public clear() {
-            this[syms.values] = {};
-        }
-        public delete(key: T) {
-            if ((key as any) in this[syms.values]) {
-                delete this[syms.values];
-                return true;
-            }
-            else return false;
-        }
-
-        public entries(): IterableIterator<[T, T]> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: [ keys[i], keys[i] ] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public keys(): IterableIterator<T> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: keys[i] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public values(): IterableIterator<T> {
-            return this.keys();
-        }
-
-        public add(val: T) {
-            this[syms.values][val] = undefined;
-            return this;
-        }
-        public has(key: T) {
-            return (key as any) in this[syms.values][key];
-        }
-
-        public get size() {
-            return internals.ownPropKeys(this[syms.values]).length;
-        }
-
-        public forEach(func: (key: T, val: T, map: Set<T>) => void, thisArg?: any) {
-            const keys = internals.ownPropKeys(this[syms.values]);
-
-            for (let i = 0; i < keys.length; i++) {
-                func(keys[i], this[syms.values][keys[i]], this);
-            }
-        }
-
-        public constructor(iterable: Iterable<T>) {
-            const it = iterable[env.global.Symbol.iterator]();
-
-            for (let el = it.next(); !el.done; el = it.next()) {
-                this[syms.values][el.value] = undefined;
-            }
-        }
-    }
-
-    env.global.Set = Set;
-});

lib/timeout.ts

@@ -1,38 +0,0 @@
-define("timeout", () => {
-    const timeouts: Record<number, () => void> = { };
-    const intervals: Record<number, () => void> = { };
-    let timeoutI = 0, intervalI = 0;
-
-    env.global.setTimeout = (func, delay, ...args) => {
-        if (typeof func !== 'function') throw new TypeError("func must be a function.");
-        delay = (delay ?? 0) - 0;
-        const cancelFunc = internals.delay(delay, () => internals.apply(func, undefined, args));
-        timeouts[++timeoutI] = cancelFunc;
-        return timeoutI;
-    };
-    env.global.setInterval = (func, delay, ...args) => {
-        if (typeof func !== 'function') throw new TypeError("func must be a function.");
-        delay = (delay ?? 0) - 0;
-
-        const i = ++intervalI;
-        intervals[i] = internals.delay(delay, callback);
-
-        return i;
-
-        function callback() {
-            internals.apply(func, undefined, args);
-            intervals[i] = internals.delay(delay!, callback);
-        }
-    };
-    
-    env.global.clearTimeout = (id) => {
-        const func = timeouts[id];
-        if (func) func();
-        timeouts[id] = undefined!;
-    };
-    env.global.clearInterval = (id) => {
-        const func = intervals[id];
-        if (func) func();
-        intervals[id] = undefined!;
-    };
-});

lib/tsconfig.json

@@ -1,34 +0,0 @@
-{
-    "files": [
-        "lib.d.ts",
-        "modules.ts",
-        "utils.ts",
-        "values/object.ts",
-        "values/symbol.ts",
-        "values/function.ts",
-        "values/errors.ts",
-        "values/string.ts",
-        "values/number.ts",
-        "values/boolean.ts",
-        "values/array.ts",
-        "promise.ts",
-        "map.ts",
-        "set.ts",
-        "regex.ts",
-        "timeout.ts",
-        "core.ts"
-    ],
-    "compilerOptions": {
-        "outFile": "../bin/me/topchetoeu/jscript/js/core.js",
-        // "declarationDir": "",
-        // "declarationDir": "bin/me/topchetoeu/jscript/dts",
-        "target": "ES5",
-        "lib": [],
-        "module": "None",
-        "stripInternal": true,
-        "downlevelIteration": true,
-        "esModuleInterop": true,
-        "forceConsistentCasingInFileNames": true,
-        "strict": true,
-    }
-}

lib/utils.ts

@@ -1,38 +0,0 @@
-function setProps<
-    TargetT extends object,
-    DescT extends {
-        [x in Exclude<keyof TargetT, 'constructor'> ]?: TargetT[x] extends ((...args: infer ArgsT) => infer RetT) ?
-            ((this: TargetT, ...args: ArgsT) => RetT) :
-            TargetT[x]
-    }
->(target: TargetT, desc: DescT) {
-    var props = internals.keys(desc, false);
-    for (var i = 0; i < props.length; i++) {
-        var key = props[i];
-        internals.defineField(
-            target, key, (desc as any)[key],
-            true, // writable
-            false, // enumerable
-            true // configurable
-        );
-    }
-}
-function setConstr(target: object, constr: Function) {
-    internals.defineField(
-        target, 'constructor', constr,
-        true, // writable
-        false, // enumerable
-        true // configurable
-    );
-}
-
-function wrapI(max: number, i: number) {
-    i |= 0;
-    if (i < 0) i = max + i;
-    return i;
-}
-function clampI(max: number, i: number) {
-    if (i < 0) i = 0;
-    if (i > max) i = max;
-    return i;
-}

lib/values/array.ts

@@ -1,336 +0,0 @@
-define("values/array", () => {
-    var Array = env.global.Array = function(len?: number) {
-        var res = [];
-
-        if (typeof len === 'number' && arguments.length === 1) {
-            if (len < 0) throw 'Invalid array length.';
-            res.length = len;
-        }
-        else {
-            for (var i = 0; i < arguments.length; i++) {
-                res[i] = arguments[i];
-            }
-        }
-
-        return res;
-    } as ArrayConstructor;
-
-    env.setProto('array', Array.prototype);
-    (Array.prototype as any)[env.global.Symbol.typeName] = "Array";
-    setConstr(Array.prototype, Array);
-
-    setProps(Array.prototype, {
-        [env.global.Symbol.iterator]: function() {
-            return this.values();
-        },
-        [env.global.Symbol.typeName]: "Array",
-
-        values() {
-            var i = 0;
-    
-            return {
-                next: () => {
-                    while (i < this.length) {
-                        if (i++ in this) return { done: false, value: this[i - 1] };
-                    }
-                    return { done: true, value: undefined };
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            };
-        },
-        keys() {
-            var i = 0;
-    
-            return {
-                next: () => {
-                    while (i < this.length) {
-                        if (i++ in this) return { done: false, value: i - 1 };
-                    }
-                    return { done: true, value: undefined };
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            };
-        },
-        entries() {
-            var i = 0;
-    
-            return {
-                next: () => {
-                    while (i < this.length) {
-                        if (i++ in this) return { done: false, value: [i - 1, this[i - 1]] };
-                    }
-                    return { done: true, value: undefined };
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            };
-        },
-        concat() {
-            var res = [] as any[];
-            res.push.apply(res, this);
-
-            for (var i = 0; i < arguments.length; i++) {
-                var arg = arguments[i];
-                if (arg instanceof Array) {
-                    res.push.apply(res, arg);
-                }
-                else {
-                    res.push(arg);
-                }
-            }
-    
-            return res;
-        },
-        every(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument not a function.");
-            func = func.bind(thisArg);
-    
-            for (var i = 0; i < this.length; i++) {
-                if (!func(this[i], i, this)) return false;
-            }
-    
-            return true;
-        },
-        some(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument not a function.");
-            func = func.bind(thisArg);
-    
-            for (var i = 0; i < this.length; i++) {
-                if (func(this[i], i, this)) return true;
-            }
-    
-            return false;
-        },
-        fill(val, start, end) {
-            if (arguments.length < 3) end = this.length;
-            if (arguments.length < 2) start = 0;
-    
-            start = clampI(this.length, wrapI(this.length + 1, start ?? 0));
-            end = clampI(this.length, wrapI(this.length + 1, end ?? this.length));
-    
-            for (; start < end; start++) {
-                this[start] = val;
-            }
-    
-            return this;
-        },
-        filter(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-    
-            var res = [];
-            for (var i = 0; i < this.length; i++) {
-                if (i in this && func.call(thisArg, this[i], i, this)) res.push(this[i]);
-            }
-            return res;
-        },
-        find(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-    
-            for (var i = 0; i < this.length; i++) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return this[i];
-            }
-    
-            return undefined;
-        },
-        findIndex(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-    
-            for (var i = 0; i < this.length; i++) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return i;
-            }
-    
-            return -1;
-        },
-        findLast(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-        
-            for (var i = this.length - 1; i >= 0; i--) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return this[i];
-            }
-        
-            return undefined;
-        },
-        findLastIndex(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-        
-            for (var i = this.length - 1; i >= 0; i--) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return i;
-            }
-        
-            return -1;
-        },
-        flat(depth) {
-            var res = [] as any[];
-            var buff = [];
-            res.push(...this);
-        
-            for (var i = 0; i < (depth ?? 1); i++) {
-                var anyArrays = false;
-                for (var el of res) {
-                    if (el instanceof Array) {
-                        buff.push(...el);
-                        anyArrays = true;
-                    }
-                    else buff.push(el);
-                }
-        
-                res = buff;
-                buff = [];
-                if (!anyArrays) break;
-            }
-        
-            return res;
-        },
-        flatMap(func, th) {
-            return this.map(func, th).flat();
-        },
-        forEach(func, thisArg) {
-            for (var i = 0; i < this.length; i++) {
-                if (i in this) func.call(thisArg, this[i], i, this);
-            }
-        },
-        map(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-        
-            var res = [];
-            for (var i = 0; i < this.length; i++) {
-                if (i in this) res[i] = func.call(thisArg, this[i], i, this);
-            }
-            return res;
-        },
-        pop() {
-            if (this.length === 0) return undefined;
-            var val = this[this.length - 1];
-            this.length--;
-            return val;
-        },
-        push() {
-            for (var i = 0; i < arguments.length; i++) {
-                this[this.length] = arguments[i];
-            }
-            return arguments.length;
-        },
-        shift() {
-            if (this.length === 0) return undefined;
-            var res = this[0];
-    
-            for (var i = 0; i < this.length - 1; i++) {
-                this[i] = this[i + 1];
-            }
-    
-            this.length--;
-    
-            return res;
-        },
-        unshift() {
-            for (var i = this.length - 1; i >= 0; i--) {
-                this[i + arguments.length] = this[i];
-            }
-            for (var i = 0; i < arguments.length; i++) {
-                this[i] = arguments[i];
-            }
-    
-            return arguments.length;
-        },
-        slice(start, end) {
-            start = clampI(this.length, wrapI(this.length + 1, start ?? 0));
-            end = clampI(this.length, wrapI(this.length + 1, end ?? this.length));
-    
-            var res: any[] = [];
-            var n = end - start;
-            if (n <= 0) return res;
-        
-            for (var i = 0; i < n; i++) {
-                res[i] = this[start + i];
-            }
-        
-            return res;
-        },
-        toString() {
-            let res = '';
-            for (let i = 0; i < this.length; i++) {
-                if (i > 0) res += ',';
-                if (i in this && this[i] !== undefined && this[i] !== null) res += this[i];
-            }
-        
-            return res;
-        },
-        indexOf(el, start) {
-            start = start! | 0;
-            for (var i = Math.max(0, start); i < this.length; i++) {
-                if (i in this && this[i] == el) return i;
-            }
-        
-            return -1;
-        },
-        lastIndexOf(el, start) {
-            start = start! | 0;
-            for (var i = this.length; i >= start; i--) {
-                if (i in this && this[i] == el) return i;
-            }
-    
-            return -1;
-        },
-        includes(el, start) {
-            return this.indexOf(el, start) >= 0;
-        },
-        join(val = ',') {
-            let res = '', first = true;
-    
-            for (let i = 0; i < this.length; i++) {
-                if (!(i in this)) continue;
-                if (!first) res += val;
-                first = false;
-                res += this[i];
-            }
-            return res;
-        },
-        sort(func) {
-            func ??= (a, b) => {
-                const _a = a + '';
-                const _b = b + '';
-    
-                if (_a > _b) return 1;
-                if (_a < _b) return -1;
-                return 0;
-            };
-    
-            if (typeof func !== 'function') throw new TypeError('Expected func to be undefined or a function.');
-    
-            internals.sort(this, func);
-            return this;
-        },
-        splice(start, deleteCount, ...items) {
-            start = clampI(this.length, wrapI(this.length, start ?? 0));
-            deleteCount = (deleteCount ?? Infinity | 0);
-            if (start + deleteCount >= this.length) deleteCount = this.length - start;
-    
-            const res = this.slice(start, start + deleteCount);
-            const moveN = items.length - deleteCount;
-            const len = this.length;
-    
-            if (moveN < 0) {
-                for (let i = start - moveN; i < len; i++) {
-                    this[i + moveN] = this[i];
-                }
-            }
-            else if (moveN > 0) {
-                for (let i = len - 1; i >= start; i--) {
-                    this[i + moveN] = this[i];
-                }
-            }
-    
-            for (let i = 0; i < items.length; i++) {
-                this[i + start] = items[i];
-            }
-    
-            this.length = len + moveN;
-    
-            return res;
-        }
-    });
-
-    setProps(Array, {
-        isArray(val: any) { return internals.isArray(val); }
-    });
-    internals.markSpecial(Array);
-});

lib/values/boolean.ts

@@ -1,12 +0,0 @@
-define("values/boolean", () => {
-    var Boolean = env.global.Boolean = function (this: Boolean | undefined, arg) {
-        var val;
-        if (arguments.length === 0) val = false;
-        else val = !!arg;
-        if (this === undefined || this === null) return val;
-        else (this as any).value = val;
-    } as BooleanConstructor;
-    
-    env.setProto('bool', Boolean.prototype);
-    setConstr(Boolean.prototype, Boolean);
-});

lib/values/errors.ts

@@ -1,46 +0,0 @@
-define("values/errors", () => {
-    var Error = env.global.Error = function Error(msg: string) {
-        if (msg === undefined) msg = '';
-        else msg += '';
-    
-        return Object.setPrototypeOf({
-            message: msg,
-            stack: [] as string[],
-        }, Error.prototype);
-    } as ErrorConstructor;
-
-    setConstr(Error.prototype, Error);
-    setProps(Error.prototype, {
-        name: 'Error',
-        toString: internals.setEnv(function(this: Error) {
-            if (!(this instanceof Error)) return '';
-        
-            if (this.message === '') return this.name;
-            else return this.name + ': ' + this.message;
-        }, env)
-    });
-    env.setProto('error', Error.prototype);
-    internals.markSpecial(Error);
-
-    function makeError<T1 extends ErrorConstructor>(name: string, proto: string): T1 {
-        function constr (msg: string) {
-            var res = new Error(msg);
-            (res as any).__proto__ = constr.prototype;
-            return res;
-        }
-
-        (constr as any).__proto__ = Error;
-        (constr.prototype as any).__proto__ = env.proto('error');
-        setConstr(constr.prototype, constr as ErrorConstructor);
-        setProps(constr.prototype, { name: name });
-
-        internals.markSpecial(constr);
-        env.setProto(proto, constr.prototype);
-        
-        return constr as T1;
-    }
-    
-    env.global.RangeError = makeError('RangeError', 'rangeErr');
-    env.global.TypeError = makeError('TypeError', 'typeErr');
-    env.global.SyntaxError = makeError('SyntaxError', 'syntaxErr');
-});

lib/values/function.ts

@@ -1,140 +0,0 @@
-define("values/function", () => {
-    var Function = env.global.Function = function() {
-        throw 'Using the constructor Function() is forbidden.';
-    } as unknown as FunctionConstructor;
-
-    env.setProto('function', Function.prototype);
-    setConstr(Function.prototype, Function);
-
-    setProps(Function.prototype, {
-        apply(thisArg, args) {
-            if (typeof args !== 'object') throw 'Expected arguments to be an array-like object.';
-            var len = args.length - 0;
-            let newArgs: any[];
-            if (internals.isArray(args)) newArgs = args;
-            else {
-                newArgs = [];
-
-                while (len >= 0) {
-                    len--;
-                    newArgs[len] = args[len];
-                }
-            }
-
-            return internals.apply(this, thisArg, newArgs);
-        },
-        call(thisArg, ...args) {
-            return this.apply(thisArg, args);
-        },
-        bind(thisArg, ...args) {
-            const func = this;
-            const res = function() {
-                const resArgs = [];
-
-                for (let i = 0; i < args.length; i++) {
-                    resArgs[i] = args[i];
-                }
-                for (let i = 0; i < arguments.length; i++) {
-                    resArgs[i + args.length] = arguments[i];
-                }
-
-                return func.apply(thisArg, resArgs);
-            };
-            res.name = "<bound> " + func.name;
-            return res;
-        },
-        toString() {
-            return 'function (...) { ... }';
-        },
-    });
-    setProps(Function, {
-        async(func) {
-            if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
-
-            return function (this: any) {
-                const args = arguments;
-
-                return new Promise((res, rej) => {
-                    const gen = internals.apply(internals.generator(func as any), this, args as any);
-
-                    (function next(type: 'none' | 'err' | 'ret', val?: any) {
-                        try {
-                            let result;
-
-                            switch (type) {
-                                case 'err': result = gen.throw(val); break;
-                                case 'ret': result = gen.next(val); break;
-                                case 'none': result = gen.next(); break;
-                            }
-                            if (result.done) res(result.value);
-                            else Promise.resolve(result.value).then(
-                                v => next('ret', v),
-                                v => next('err', v)
-                            )
-                        }
-                        catch (e) {
-                            rej(e);
-                        }
-                    })('none');
-                });
-            };
-        },
-        asyncGenerator(func) {
-            if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
-
-            return function(this: any, ...args: any[]) {
-                const gen = internals.apply(internals.generator((_yield) => func(
-                    val => _yield(['await', val]) as any,
-                    val => _yield(['yield', val])
-                )), this, args) as Generator<['await' | 'yield', any]>;
-
-                const next = (resolve: Function, reject: Function, type: 'none' | 'val' | 'ret' | 'err', val?: any) => {
-                    let res;
-
-                    try {
-                        switch (type) {
-                            case 'val': res = gen.next(val); break;
-                            case 'ret': res = gen.return(val); break;
-                            case 'err': res = gen.throw(val); break;
-                            default: res = gen.next(); break;
-                        }
-                    }
-                    catch (e) { return reject(e); }
-
-                    if (res.done) return { done: true, res: <any>res };
-                    else if (res.value[0] === 'await') Promise.resolve(res.value[1]).then(
-                        v => next(resolve, reject, 'val', v),
-                        v => next(resolve, reject, 'err', v),
-                    )
-                    else resolve({ done: false, value: res.value[1] });
-                };
-
-                return {
-                    next() {
-                        const args = arguments;
-                        if (arguments.length === 0) return new Promise((res, rej) => next(res, rej, 'none'));
-                        else return new Promise((res, rej) => next(res, rej, 'val', args[0]));
-                    },
-                    return: (value) => new Promise((res, rej) => next(res, rej, 'ret', value)),
-                    throw: (value) => new Promise((res, rej) => next(res, rej, 'err', value)),
-                    [env.global.Symbol.asyncIterator]() { return this; }
-                }
-            }
-        },
-        generator(func) {
-            if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
-            const gen = internals.generator(func);
-            return function(this: any, ...args: any[]) {
-                const it = internals.apply(gen, this, args);
-
-                return {
-                    next: (...args) => internals.apply(it.next, it, args),
-                    return: (val) => internals.apply(it.next, it, [val]),
-                    throw: (val) => internals.apply(it.next, it, [val]),
-                    [env.global.Symbol.iterator]() { return this; }
-                }
-            }
-        }
-    })
-    internals.markSpecial(Function);
-});

lib/values/number.ts

@@ -1,33 +0,0 @@
-define("values/number", () => {
-    var Number = env.global.Number = function(this: Number | undefined, arg: any) {
-        var val;
-        if (arguments.length === 0) val = 0;
-        else val = arg - 0;
-        if (this === undefined || this === null) return val;
-        else (this as any).value = val;
-    } as NumberConstructor;
-
-    env.setProto('number', Number.prototype);
-    setConstr(Number.prototype, Number);
-
-    setProps(Number.prototype, {
-        valueOf() {
-            if (typeof this === 'number') return this;
-            else return (this as any).value;
-        },
-        toString() {
-            if (typeof this === 'number') return this + '';
-            else return (this as any).value + '';
-        }
-    });
-
-    setProps(Number, {
-        parseInt(val) { return Math.trunc(val as any - 0); },
-        parseFloat(val) { return val as any - 0; },
-    });
-
-    env.global.parseInt = Number.parseInt;
-    env.global.parseFloat = Number.parseFloat;
-    env.global.Object.defineProperty(env.global, 'NaN', { value: 0 / 0, writable: false });
-    env.global.Object.defineProperty(env.global, 'Infinity', { value: 1 / 0, writable: false });
-});

lib/values/object.ts

@@ -1,226 +0,0 @@
-define("values/object", () => {
-    var Object = env.global.Object = function(arg: any) {
-        if (arg === undefined || arg === null) return {};
-        else if (typeof arg === 'boolean') return new Boolean(arg);
-        else if (typeof arg === 'number') return new Number(arg);
-        else if (typeof arg === 'string') return new String(arg);
-        return arg;
-    } as ObjectConstructor;
-
-    env.setProto('object', Object.prototype);
-    (Object.prototype as any).__proto__ = null;
-    setConstr(Object.prototype, Object as any);
-
-    function throwNotObject(obj: any, name: string) {
-        if (obj === null || typeof obj !== 'object' && typeof obj !== 'function') {
-            throw new TypeError(`Object.${name} may only be used for objects.`);
-        }
-    }
-    function check(obj: any) {
-        return typeof obj === 'object' && obj !== null || typeof obj === 'function';
-    }
-
-    setProps(Object, {
-        assign(dst, ...src) {
-            throwNotObject(dst, 'assign');
-            for (let i = 0; i < src.length; i++) {
-                const obj = src[i];
-                throwNotObject(obj, 'assign');
-                for (const key of Object.keys(obj)) {
-                    (dst as any)[key] = (obj as any)[key];
-                }
-            }
-            return dst;
-        },
-        create(obj, props) {
-            props ??= {};
-            return Object.defineProperties({ __proto__: obj }, props as any) as any;
-        },
-
-        defineProperty(obj, key, attrib) {
-            throwNotObject(obj, 'defineProperty');
-            if (typeof attrib !== 'object') throw new TypeError('Expected attributes to be an object.');
-
-            if ('value' in attrib) {
-                if ('get' in attrib || 'set' in attrib) throw new TypeError('Cannot specify a value and accessors for a property.');
-                if (!internals.defineField(
-                    obj, key,
-                    attrib.value,
-                    !!attrib.writable,
-                    !!attrib.enumerable,
-                    !!attrib.configurable
-                )) throw new TypeError('Can\'t define property \'' + key + '\'.');
-            }
-            else {
-                if (typeof attrib.get !== 'function' && attrib.get !== undefined) throw new TypeError('Get accessor must be a function.');
-                if (typeof attrib.set !== 'function' && attrib.set !== undefined) throw new TypeError('Set accessor must be a function.');
-
-                if (!internals.defineProp(
-                    obj, key,
-                    attrib.get,
-                    attrib.set,
-                    !!attrib.enumerable,
-                    !!attrib.configurable
-                )) throw new TypeError('Can\'t define property \'' + key + '\'.');
-            }
-
-            return obj;
-        },
-        defineProperties(obj, attrib) {
-            throwNotObject(obj, 'defineProperties');
-            if (typeof attrib !== 'object' && typeof attrib !== 'function') throw 'Expected second argument to be an object.';
-
-            for (var key in attrib) {
-                Object.defineProperty(obj, key, attrib[key]);
-            }
-
-            return obj;
-        },
-
-        keys(obj, onlyString) {
-            return internals.keys(obj, !!(onlyString ?? true));
-        },
-        entries(obj, onlyString) {
-            const res = [];
-            const keys = internals.keys(obj, !!(onlyString ?? true));
-
-            for (let i = 0; i < keys.length; i++) {
-                res[i] = [ keys[i], (obj as any)[keys[i]] ];
-            }
-
-            return keys;
-        },
-        values(obj, onlyString) {
-            const res = [];
-            const keys = internals.keys(obj, !!(onlyString ?? true));
-
-            for (let i = 0; i < keys.length; i++) {
-                res[i] = (obj as any)[keys[i]];
-            }
-
-            return keys;
-        },
-
-        getOwnPropertyDescriptor(obj, key) {
-            return internals.ownProp(obj, key) as any;
-        },
-        getOwnPropertyDescriptors(obj) {
-            const res = [];
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                res[i] = internals.ownProp(obj, keys[i]);
-            }
-
-            return res;
-        },
-
-        getOwnPropertyNames(obj) {
-            const arr = internals.ownPropKeys(obj);
-            const res = [];
-
-            for (let i = 0; i < arr.length; i++) {
-                if (typeof arr[i] === 'symbol') continue;
-                res[res.length] = arr[i];
-            }
-
-            return res as any;
-        },
-        getOwnPropertySymbols(obj) {
-            const arr = internals.ownPropKeys(obj);
-            const res = [];
-
-            for (let i = 0; i < arr.length; i++) {
-                if (typeof arr[i] !== 'symbol') continue;
-                res[res.length] = arr[i];
-            }
-
-            return res as any;
-        },
-        hasOwn(obj, key) {
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                if (keys[i] === key) return true;
-            }
-
-            return false;
-        },
-
-        getPrototypeOf(obj) {
-            return obj.__proto__;
-        },
-        setPrototypeOf(obj, proto) {
-            (obj as any).__proto__ = proto;
-            return obj;
-        },
-
-        fromEntries(iterable) {
-            const res = {} as any;
-
-            for (const el of iterable) {
-                res[el[0]] = el[1];
-            }
-
-            return res;
-        },
-
-        preventExtensions(obj) {
-            throwNotObject(obj, 'preventExtensions');
-            internals.lock(obj, 'ext');
-            return obj;
-        },
-        seal(obj) {
-            throwNotObject(obj, 'seal');
-            internals.lock(obj, 'seal');
-            return obj;
-        },
-        freeze(obj) {
-            throwNotObject(obj, 'freeze');
-            internals.lock(obj, 'freeze');
-            return obj;
-        },
-
-        isExtensible(obj) {
-            if (!check(obj)) return false;
-            return internals.extensible(obj);
-        },
-        isSealed(obj) {
-            if (!check(obj)) return true;
-            if (internals.extensible(obj)) return false;
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                if (internals.ownProp(obj, keys[i]).configurable) return false;
-            }
-
-            return true;
-        },
-        isFrozen(obj) {
-            if (!check(obj)) return true;
-            if (internals.extensible(obj)) return false;
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                const prop = internals.ownProp(obj, keys[i]);
-                if (prop.configurable) return false;
-                if ('writable' in prop && prop.writable) return false;
-            }
-
-            return true;
-        }
-    });
-
-    setProps(Object.prototype, {
-        valueOf() {
-            return this;
-        },
-        toString() {
-            return '[object ' + (this[env.global.Symbol.typeName] ?? 'Unknown') + ']';
-        },
-        hasOwnProperty(key) {
-            return Object.hasOwn(this, key);
-        },
-    });
-    internals.markSpecial(Object);
-});

lib/values/string.ts

@@ -1,267 +0,0 @@
-define("values/string", () => {
-    var String = env.global.String = function(this: String | undefined, arg: any) {
-        var val;
-        if (arguments.length === 0) val = '';
-        else val = arg + '';
-        if (this === undefined || this === null) return val;
-        else (this as any).value = val;
-    } as StringConstructor;
-
-    env.setProto('string', String.prototype);
-    setConstr(String.prototype, String);
-
-    setProps(String.prototype, {
-        toString() {
-            if (typeof this === 'string') return this;
-            else return (this as any).value;
-        },
-        valueOf() {
-            if (typeof this === 'string') return this;
-            else return (this as any).value;
-        },
-
-        substring(start, end) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.substring(start, end);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-            start = start ?? 0 | 0;
-            end = (end ?? this.length) | 0;
-
-            const res = [];
-
-            for (let i = start; i < end; i++) {
-                if (i >= 0 && i < this.length) res[res.length] = this[i];
-            }
-
-            return internals.stringFromStrings(res);
-        },
-        substr(start, length) {
-            start = start ?? 0 | 0;
-
-            if (start >= this.length) start = this.length - 1;
-            if (start < 0) start = 0;
-
-            length = (length ?? this.length - start) | 0;
-            const end = length + start;
-            const res = [];
-
-            for (let i = start; i < end; i++) {
-                if (i >= 0 && i < this.length) res[res.length] = this[i];
-            }
-
-            return internals.stringFromStrings(res);
-        },
-
-        toLowerCase() {
-            // TODO: Implement localization
-            const res = [];
-
-            for (let i = 0; i < this.length; i++) {
-                const c = internals.char(this[i]);
-
-                if (c >= 65 && c <= 90) res[i] = c - 65 + 97;
-                else res[i] = c;
-            }
-
-            return internals.stringFromChars(res);
-        },
-        toUpperCase() {
-            // TODO: Implement localization
-            const res = [];
-
-            for (let i = 0; i < this.length; i++) {
-                const c = internals.char(this[i]);
-
-                if (c >= 97 && c <= 122) res[i] = c - 97 + 65;
-                else res[i] = c;
-            }
-
-            return internals.stringFromChars(res);
-        },
-
-        charAt(pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.charAt(pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            pos = pos | 0;
-            if (pos < 0 || pos >= this.length) return '';
-            return this[pos];
-        },
-        charCodeAt(pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.charAt(pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            pos = pos | 0;
-            if (pos < 0 || pos >= this.length) return 0 / 0;
-            return internals.char(this[pos]);
-        },
-
-        startsWith(term, pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.startsWith(term, pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-            pos = pos! | 0;
-            term = term + "";
-
-            if (pos < 0 || this.length < term.length + pos) return false;
-
-            for (let i = 0; i < term.length; i++) {
-                if (this[i + pos] !== term[i]) return false;
-            }
-
-            return true;
-        },
-        endsWith(term, pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.endsWith(term, pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-            pos = (pos ?? this.length) | 0;
-            term = term + "";
-
-            const start = pos - term.length;
-
-            if (start < 0 || this.length < term.length + start) return false;
-
-            for (let i = 0; i < term.length; i++) {
-                if (this[i + start] !== term[i]) return false;
-            }
-
-            return true;
-        },
-
-        indexOf(term: any, start) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.indexOf(term, start);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof term[env.global.Symbol.search] !== 'function') term = RegExp.escape(term);
-
-            return term[env.global.Symbol.search](this, false, start);
-        },
-        lastIndexOf(term: any, start) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.indexOf(term, start);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof term[env.global.Symbol.search] !== 'function') term = RegExp.escape(term);
-
-            return term[env.global.Symbol.search](this, true, start);
-        },
-        includes(term, start) {
-            return this.indexOf(term, start) >= 0;
-        },
-
-        replace(pattern: any, val) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.replace(pattern, val);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.replace] !== 'function') pattern = RegExp.escape(pattern);
-
-            return pattern[env.global.Symbol.replace](this, val);
-        },
-        replaceAll(pattern: any, val) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.replace(pattern, val);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.replace] !== 'function') pattern = RegExp.escape(pattern, "g");
-            if (pattern instanceof RegExp && !pattern.global) pattern = new pattern.constructor(pattern.source, pattern.flags + "g");
-
-            return pattern[env.global.Symbol.replace](this, val);
-        },
-
-        match(pattern: any) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.match(pattern);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.match] !== 'function') pattern = RegExp.escape(pattern);
-
-            return pattern[env.global.Symbol.match](this);
-        },
-        matchAll(pattern: any) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.matchAll(pattern);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.match] !== 'function') pattern = RegExp.escape(pattern, "g");
-            if (pattern instanceof RegExp && !pattern.global) pattern = new pattern.constructor(pattern.source, pattern.flags + "g");
-
-            return pattern[env.global.Symbol.match](this);
-        },
-
-        split(pattern: any, lim, sensible) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.split(pattern, lim, sensible);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.split] !== 'function') pattern = RegExp.escape(pattern, "g");
-
-            return pattern[env.global.Symbol.split](this, lim, sensible);
-        },
-        slice(start, end) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.slice(start, end);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            start = wrapI(this.length, start ?? 0 | 0);
-            end = wrapI(this.length, end ?? this.length | 0);
-
-            if (start > end) return '';
-
-            return this.substring(start, end);
-        },
-
-        concat(...args) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.concat(...args);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            var res = this;
-            for (var arg of args) res += arg;
-            return res;
-        },
-
-        trim() {
-            return this
-                .replace(/^\s+/g, '')
-                .replace(/\s+$/g, '');
-        }
-    });
-
-    setProps(String, {
-        fromCharCode(val) {
-            return internals.stringFromChars([val | 0]);
-        },
-    })
-
-    env.global.Object.defineProperty(String.prototype, 'length', {
-        get() {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.length;
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            return internals.strlen(this);
-        },
-        configurable: true,
-        enumerable: false,
-    });
-});

lib/values/symbol.ts

@@ -1,36 +0,0 @@
-define("values/symbol", () => {
-    const symbols: Record<string, symbol> = { };
-
-    var Symbol = env.global.Symbol = function(this: any, val?: string) {
-        if (this !== undefined && this !== null) throw new TypeError("Symbol may not be called with 'new'.");
-        if (typeof val !== 'string' && val !== undefined) throw new TypeError('val must be a string or undefined.');
-        return internals.symbol(val);
-    } as SymbolConstructor;
-
-    env.setProto('symbol', Symbol.prototype);
-    setConstr(Symbol.prototype, Symbol);
-
-    setProps(Symbol, {
-        for(key) {
-            if (typeof key !== 'string' && key !== undefined) throw new TypeError('key must be a string or undefined.');
-            if (key in symbols) return symbols[key];
-            else return symbols[key] = internals.symbol(key);
-        },
-        keyFor(sym) {
-            if (typeof sym !== 'symbol') throw new TypeError('sym must be a symbol.');
-            return internals.symbolToString(sym);
-        },
-
-        typeName: Symbol("Symbol.name") as any,
-        replace: Symbol('Symbol.replace') as any,
-        match: Symbol('Symbol.match') as any,
-        matchAll: Symbol('Symbol.matchAll') as any,
-        split: Symbol('Symbol.split') as any,
-        search: Symbol('Symbol.search') as any,
-        iterator: Symbol('Symbol.iterator') as any,
-        asyncIterator: Symbol('Symbol.asyncIterator') as any,
-    });
-
-    internals.defineField(env.global.Object.prototype, Symbol.typeName, 'Object', false, false, false);
-    internals.defineField(env.global, Symbol.typeName, 'Window', false, false, false);
-});

package-lock.json

@@ -1,6 +0,0 @@
-{
-  "name": "java-jscript",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {}
-}

package.json

@@ -1 +0,0 @@
-{}

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

@@ -0,0 +1,54 @@
+package me.topchetoeu.jscript;
+
+import java.io.File;
+
+public class Filename {
+    public final String protocol;
+    public final String path;
+
+    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 static Filename fromFile(File file) {
+        return new Filename("file", file.getAbsolutePath());
+    }
+
+
+    public Filename(String protocol, String path) {
+        path = path.trim();
+        protocol = protocol.trim();
+        this.protocol = protocol;
+        this.path = path;
+    }
+}

src/me/topchetoeu/jscript/Location.java

@@ -1,18 +1,18 @@
 package me.topchetoeu.jscript;
 
-public class Location {
-    public static final Location INTERNAL = new Location(0, 0, "<internal>");
+public class Location implements Comparable<Location> {
+    public static final Location INTERNAL = new Location(0, 0, new Filename("jscript", "native"));
     private int line;
     private int start;
-    private String filename;
+    private Filename filename;
 
     public int line() { return line; }
     public int start() { return start; }
-    public String filename() { return filename; }
+    public Filename filename() { return filename; }
 
     @Override
     public String toString() {
-        return filename + ":" + line + ":" + start;
+        return filename.toString() + ":" + line + ":" + start;
     }
 
     public Location add(int n, boolean clone) {
@@ -55,7 +55,18 @@ public class Location {
         return true;
     }
 
-    public Location(int line, int start, String filename) {
+    @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;

src/me/topchetoeu/jscript/Main.java

@@ -1,146 +1,150 @@
 package me.topchetoeu.jscript;
 
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
+import java.net.InetSocketAddress;
 import java.nio.file.Files;
 import java.nio.file.Path;
 
-import me.topchetoeu.jscript.engine.MessageContext;
 import me.topchetoeu.jscript.engine.Context;
 import me.topchetoeu.jscript.engine.Engine;
-import me.topchetoeu.jscript.engine.FunctionContext;
+import me.topchetoeu.jscript.engine.Environment;
+import me.topchetoeu.jscript.engine.StackData;
+import me.topchetoeu.jscript.engine.debug.DebugServer;
+import me.topchetoeu.jscript.engine.debug.SimpleDebugger;
+import me.topchetoeu.jscript.engine.values.ArrayValue;
+import me.topchetoeu.jscript.engine.values.NativeFunction;
+import me.topchetoeu.jscript.engine.values.ObjectValue;
 import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.events.Observer;
 import me.topchetoeu.jscript.exceptions.EngineException;
+import me.topchetoeu.jscript.exceptions.InterruptException;
 import me.topchetoeu.jscript.exceptions.SyntaxException;
-import me.topchetoeu.jscript.interop.NativeTypeRegister;
-import me.topchetoeu.jscript.polyfills.Internals;
+import me.topchetoeu.jscript.lib.Internals;
 
 public class Main {
-    static Thread task;
+    static Thread engineTask, debugTask;
     static Engine engine;
-    static FunctionContext env;
-
-    public static String streamToString(InputStream in) {
-        try {
-            StringBuilder out = new StringBuilder();
-            BufferedReader br = new BufferedReader(new InputStreamReader(in));
-
-            for(var line = br.readLine(); line != null; line = br.readLine()) {
-                out.append(line).append('\n');
-            }
-
-            br.close();
-            return out.toString();
-        }
-        catch (IOException e) {
-            return null;
-        }
-    }
-    public static String resourceToString(String name) {
-        var str = Main.class.getResourceAsStream("/me/topchetoeu/jscript/" + name);
-        if (str == null) return null;
-        return streamToString(str);
-    }
+    static Environment env;
+    static int j = 0;
 
     private static Observer<Object> valuePrinter = new Observer<Object>() {
         public void next(Object data) {
-            try {
-                Values.printValue(null, data);
-            }
-            catch (InterruptedException e) { }
+            Values.printValue(null, data);
             System.out.println();
         }
 
         public void error(RuntimeException err) {
-            try {
-                try {
-                    if (err instanceof EngineException) {
-                        System.out.println("Uncaught " + ((EngineException)err).toString(new Context(null, new MessageContext(engine))));
-                    }
-                    else if (err instanceof SyntaxException) {
-                        System.out.println("Syntax error:" + ((SyntaxException)err).msg);
-                    }
-                    else if (err.getCause() instanceof InterruptedException) return;
-                    else {
-                        System.out.println("Internal error ocurred:");
-                        err.printStackTrace();
-                    }
-                }
-                catch (EngineException ex) {
-                    System.out.println("Uncaught ");
-                    Values.printValue(null, ((EngineException)err).value);
-                    System.out.println();
-                }
-            }
-            catch (InterruptedException ex) {
-                return;
-            }
+            Values.printError(err, null);
+        }
+
+        @Override
+        public void finish() {
+            engineTask.interrupt();
         }
     };
 
     public static void main(String args[]) {
         System.out.println(String.format("Running %s v%s by %s", Metadata.NAME, Metadata.VERSION, Metadata.AUTHOR));
-        var in = new BufferedReader(new InputStreamReader(System.in));
-        engine = new Engine();
-        env = new FunctionContext(null, null, null);
-        var builderEnv = new FunctionContext(null, new NativeTypeRegister(), null);
+        engine = new Engine(true);
+
+        env = new Environment(null, null, null);
         var exited = new boolean[1];
+        var server = new DebugServer();
+        server.targets.put("target", (ws, req) -> new SimpleDebugger(ws, engine));
 
-        env.global.define("exit", ctx -> {
-            exited[0] = true;
-            task.interrupt();
-            throw new InterruptedException();
-        });
-        env.global.define("go", ctx -> {
-            try {
-                var func = ctx.compile("do.js", new String(Files.readAllBytes(Path.of("do.js"))));
-                return func.call(ctx);
-            }
-            catch (IOException e) {
-                throw new EngineException("Couldn't open do.js");
-            }
-        });
+        engineTask = engine.start();
+        debugTask = server.start(new InetSocketAddress("127.0.0.1", 9229), true);
 
-        engine.pushMsg(false, new Context(builderEnv, new MessageContext(engine)), "core.js", resourceToString("js/core.js"), null, env, new Internals()).toObservable().on(valuePrinter);
+        engine.pushMsg(false, null, new NativeFunction((ctx, thisArg, _a) -> {
+            new Internals().apply(env);
+
+            env.global.define("exit", _ctx -> {
+                exited[0] = true;
+                throw new InterruptException();
+            });
+            env.global.define("go", _ctx -> {
+                try {
+                    var f = Path.of("do.js");
+                    var func = _ctx.compile(new Filename("do", "do/" + j++ + ".js"), new String(Files.readAllBytes(f)));
+                    return func.call(_ctx);
+                }
+                catch (IOException e) {
+                    throw new EngineException("Couldn't open do.js");
+                }
+            });
+            // TODO: make better API
+            env.global.define(true, new NativeFunction("include", (_ctx, th, __args) -> {
+                try {
+                    var currFilename = StackData.peekFrame(_ctx).function.loc().filename();
+                    var loc = Path.of("").toAbsolutePath();
+                    if (currFilename.protocol.equals("file")) loc = Path.of(currFilename.path).getParent();
+                    var path = loc.resolve(Path.of(__args.length >= 1 ? Values.toString(_ctx, __args[0]) : ""));
+                    var src = Files.readString(path);
+                    var func = _ctx.compile(Filename.fromFile(path.toFile()), src);
+                    var callArgs = new ArrayValue();
+                    if (__args.length >= 2 && __args[1] instanceof ArrayValue) callArgs = (ArrayValue)__args[1];
+                    return func.call(_ctx, null, callArgs);
+                }
+                catch (IOException e) { throw EngineException.ofError("IOError", "Couldn't open file."); }
+            }));
+
+            return null;
+        }), null).await();
+
+        try {
+            var tsEnv = env.child();
+            tsEnv.global.define(null, "module", false, new ObjectValue());
+            engine.pushMsg(
+                false, new Context(engine).pushEnv(tsEnv),
+                new Filename("jscript", "ts.js"),
+                Reading.resourceToString("js/ts.js"), null
+            ).await();
+            System.out.println("Loaded typescript!");
+
+            var ctx = new Context(engine).pushEnv(env.child());
+
+            engine.pushMsg(
+                false, ctx,
+                new Filename("jscript", "internals/bootstrap.js"), Reading.resourceToString("js/bootstrap.js"), null,
+                tsEnv.global.get(ctx, "ts"), env, new ArrayValue(null, Reading.resourceToString("js/lib.d.ts"))
+            ).await();
+        }
+        catch (EngineException e) {
+            Values.printError(e, "(while initializing TS)");
+        }
 
-        task = engine.start();
         var reader = new Thread(() -> {
             try {
-                while (true) {
+                for (var arg : args) {
                     try {
-                        var raw = in.readLine();
+                        var file = Path.of(arg);
+                        var raw = Files.readString(file);
+                        valuePrinter.next(engine.pushMsg(false, new Context(engine).pushEnv(env), Filename.fromFile(file.toFile()), raw, null).await());
+                    }
+                    catch (EngineException e) { Values.printError(e, ""); }
+                }
+                for (var i = 0; ; i++) {
+                    try {
+                        var raw = Reading.read();
 
                         if (raw == null) break;
-                        engine.pushMsg(false, new Context(env, new MessageContext(engine)), "<stdio>", raw, null).toObservable().once(valuePrinter);
-                    }
-                    catch (EngineException e) {
-                        try {
-                            System.out.println("Uncaught " + e.toString(null));
-                        }
-                        catch (EngineException ex) {
-                            System.out.println("Uncaught [error while converting to string]");
-                        }
+                        valuePrinter.next(engine.pushMsg(false, new Context(engine).pushEnv(env), new Filename("jscript", "repl/" + i + ".js"), raw, null).await());
                     }
+                    catch (EngineException e) { Values.printError(e, ""); }
                 }
             }
-            catch (IOException e) {
-                e.printStackTrace();
-                return;
-            }
+            catch (IOException e) { exited[0] = true; }
             catch (SyntaxException ex) {
                 if (exited[0]) return;
                 System.out.println("Syntax error:" + ex.msg);
             }
             catch (RuntimeException ex) {
-                if (exited[0]) return;
-                System.out.println("Internal error ocurred:");
-                ex.printStackTrace();
+                if (!exited[0]) {
+                    System.out.println("Internal error ocurred:");
+                    ex.printStackTrace();
+                }
             }
-            catch (InterruptedException e) { return; }
-            if (exited[0]) return;
+            if (exited[0]) debugTask.interrupt();
         });
         reader.setDaemon(true);
         reader.setName("STD Reader");

src/me/topchetoeu/jscript/Reading.java

@@ -0,0 +1,36 @@
+package me.topchetoeu.jscript;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import me.topchetoeu.jscript.exceptions.UncheckedException;
+
+public class Reading {
+    private static final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+
+    public static synchronized String read() throws IOException {
+        return reader.readLine();
+    }
+
+    public static String streamToString(InputStream in) {
+        try {
+            StringBuilder out = new StringBuilder();
+            BufferedReader br = new BufferedReader(new InputStreamReader(in));
+
+            for(var line = br.readLine(); line != null; line = br.readLine()) {
+                out.append(line).append('\n');
+            }
+
+            br.close();
+            return out.toString();
+        }
+        catch (Throwable e) { throw new UncheckedException(e); }
+    }
+    public static String resourceToString(String name) {
+        var str = Main.class.getResourceAsStream("/me/topchetoeu/jscript/" + name);
+        if (str == null) return null;
+        return streamToString(str);
+    }
+}

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

@@ -1,19 +0,0 @@
-package me.topchetoeu.jscript.compilation;
-
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
-
-public abstract class AssignStatement extends Statement {
-    public abstract void compile(List<Instruction> target, ScopeRecord scope, boolean retPrevValue);
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        compile(target, scope, false);
-    }
-
-    protected AssignStatement(Location loc) {
-        super(loc);
-    }
-}

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

@@ -4,7 +4,7 @@ import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.Operation;
 
 public abstract class AssignableStatement extends Statement {
-    public abstract AssignStatement toAssign(Statement val, Operation operation);
+    public abstract Statement toAssign(Statement val, Operation operation);
 
     protected AssignableStatement(Location loc) {
         super(loc);

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

@@ -1,11 +0,0 @@
-package me.topchetoeu.jscript.compilation;
-
-public class CompileOptions {
-    public final boolean emitBpMap;
-    public final boolean emitVarNames;
-
-    public CompileOptions(boolean emitBpMap, boolean emitVarNames) {
-        this.emitBpMap = emitBpMap;
-        this.emitVarNames = emitVarNames;
-    }
-}

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

@@ -0,0 +1,38 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.Map;
+import java.util.TreeSet;
+import java.util.Vector;
+
+import me.topchetoeu.jscript.Location;
+
+public class CompileTarget {
+    public final Vector<Instruction> target = new Vector<>();
+    public final Map<Long, FunctionBody> functions;
+    public final TreeSet<Location> breakpoints;
+
+    public Instruction add(Instruction instr) {
+        target.add(instr);
+        return instr;
+    }
+    public Instruction set(int i, Instruction instr) {
+        return target.set(i, instr);
+    }
+    public void setDebug(int i) {
+        breakpoints.add(target.get(i).location);
+    }
+    public void setDebug() {
+        setDebug(target.size() - 1);
+    }
+    public Instruction get(int i) {
+        return target.get(i);
+    }
+    public int size() { return target.size(); }
+
+    public Instruction[] array() { return target.toArray(Instruction[]::new); }
+
+    public CompileTarget(Map<Long, FunctionBody> functions, TreeSet<Location> breakpoints) {
+        this.functions = functions;
+        this.breakpoints = breakpoints;
+    }
+}

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

@@ -1,7 +1,6 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Vector;
 
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.control.ContinueStatement;
@@ -12,16 +11,7 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class CompoundStatement extends Statement {
     public final Statement[] statements;
-
-    @Override
-    public boolean pollutesStack() {
-        for (var stm : statements) {
-            if (stm instanceof FunctionStatement) continue;
-            return true;
-        }
-
-        return false;
-    }
+    public Location end;
 
     @Override
     public void declare(ScopeRecord varsScope) {
@@ -31,12 +21,12 @@ public class CompoundStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var stm : statements) {
             if (stm instanceof FunctionStatement) {
                 int start = target.size();
                 ((FunctionStatement)stm).compile(target, scope, null, true);
-                target.get(start).setDebug(true);
+                target.setDebug(start);
                 target.add(Instruction.discard());
             }
         }
@@ -45,14 +35,19 @@ public class CompoundStatement extends Statement {
             var stm = statements[i];
 
             if (stm instanceof FunctionStatement) continue;
-            if (i != statements.length - 1) stm.compileNoPollution(target, scope, true);
-            else stm.compileWithPollution(target, scope);
+            if (i != statements.length - 1) stm.compileWithDebug(target, scope, false);
+            else stm.compileWithDebug(target, scope, pollute);
+        }
+
+        if (end != null) {
+            target.add(Instruction.nop().locate(end));
+            target.setDebug();
         }
     }
 
     @Override
     public Statement optimize() {
-        var res = new ArrayList<Statement>();
+        var res = new Vector<Statement>(statements.length);
 
         for (var i = 0; i < statements.length; i++) {
             var stm = statements[i].optimize();
@@ -70,6 +65,11 @@ public class CompoundStatement extends Statement {
         else return new CompoundStatement(loc(), res.toArray(Statement[]::new));
     }
 
+    public CompoundStatement setEnd(Location loc) {
+        this.end = loc;
+        return this;
+    }
+
     public CompoundStatement(Location loc, Statement ...statements) {
         super(loc);
         this.statements = statements;

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

@@ -1,7 +1,5 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.values.ConstantStatement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,13 +8,9 @@ public class DiscardStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return false; }
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.compile(target, scope, false);
         
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        if (value == null) return;
-        value.compile(target, scope);
-        if (value.pollutesStack()) target.add(Instruction.discard());
     }
     @Override
     public Statement optimize() {

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

@@ -0,0 +1,17 @@
+package me.topchetoeu.jscript.compilation;
+
+public class FunctionBody {
+    public final Instruction[] instructions;
+    public final String[] captureNames, localNames;
+
+    public FunctionBody(Instruction[] instructions, String[] captureNames, String[] localNames) {
+        this.instructions = instructions;
+        this.captureNames = captureNames;
+        this.localNames = localNames;
+    }
+    public FunctionBody(Instruction[] instructions) {
+        this.instructions = instructions;
+        this.captureNames = new String[0];
+        this.localNames = new String[0];
+    }
+}

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

@@ -7,7 +7,6 @@ import me.topchetoeu.jscript.exceptions.SyntaxException;
 public class Instruction {
     public static enum Type {
         RETURN,
-        SIGNAL,
         THROW,
         THROW_SYNTAX,
         DELETE,
@@ -91,16 +90,11 @@ public class Instruction {
     public final Type type;
     public final Object[] params;
     public Location location;
-    public boolean debugged;
 
     public Instruction locate(Location loc) {
         this.location = loc;
         return this;
     }
-    public Instruction setDebug(boolean debug) {
-        debugged = debug;
-        return this;
-    }
 
     @SuppressWarnings("unchecked")
     public <T> T get(int i) {
@@ -153,21 +147,7 @@ public class Instruction {
     public static Instruction debug() {
         return new Instruction(null, Type.NOP, "debug");
     }
-    public static Instruction debugVarNames(String[] names) {
-        var args = new Object[names.length + 1];
-        args[0] = "dbg_vars";
 
-        System.arraycopy(names, 0, args, 1, names.length);
-
-        return new Instruction(null, Type.NOP, args);
-    }
-
-    /**
-     * ATTENTION: Usage outside of try/catch is broken af
-     */
-    public static Instruction signal(String name) {
-        return new Instruction(null, Type.SIGNAL, name);
-    }
     public static Instruction nop(Object ...params) {
         for (var param : params) {
             if (param instanceof String) continue;
@@ -221,9 +201,9 @@ public class Instruction {
     public static Instruction loadRegex(String pattern, String flags) {
         return new Instruction(null, Type.LOAD_REGEX, pattern, flags);
     }
-    public static Instruction loadFunc(int instrN, int varN, int len, int[] captures) {
+    public static Instruction loadFunc(long id, int varN, int len, int[] captures) {
         var args = new Object[3 + captures.length];
-        args[0] = instrN;
+        args[0] = id;
         args[1] = varN;
         args[2] = len;
         for (var i = 0; i < captures.length; i++) args[i + 3] = captures[i];
@@ -271,8 +251,8 @@ public class Instruction {
         return new Instruction(null, Type.TYPEOF, varName);
     }
 
-    public static Instruction keys() {
-        return new Instruction(null, Type.KEYS);
+    public static Instruction keys(boolean forInFormat) {
+        return new Instruction(null, Type.KEYS, forInFormat);
     }
 
     public static Instruction defProp() {

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

@@ -1,36 +1,20 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public abstract class Statement {
     private Location _loc;
 
-    public abstract boolean pollutesStack();
     public boolean pure() { return false; }
-    public abstract void compile(List<Instruction> target, ScopeRecord scope);
+    public abstract void compile(CompileTarget target, ScopeRecord scope, boolean pollute);
     public void declare(ScopeRecord varsScope) { }
     public Statement optimize() { return this; }
 
-    public void compileNoPollution(List<Instruction> target, ScopeRecord scope, boolean debug) {
+    public void compileWithDebug(CompileTarget target, ScopeRecord scope, boolean pollute) {
         int start = target.size();
-        compile(target, scope);
-        if (debug && target.size() != start) target.get(start).setDebug(true);
-        if (pollutesStack()) target.add(Instruction.discard().locate(loc()));
-    }
-    public void compileWithPollution(List<Instruction> target, ScopeRecord scope, boolean debug) {
-        int start = target.size();
-        compile(target, scope);
-        if (debug && target.size() != start) target.get(start).setDebug(true);
-        if (!pollutesStack()) target.add(Instruction.loadValue(null).locate(loc()));
-    }
-    public void compileNoPollution(List<Instruction> target, ScopeRecord scope) {
-        compileNoPollution(target, scope, false);
-    }
-    public void compileWithPollution(List<Instruction> target, ScopeRecord scope) {
-        compileWithPollution(target, scope, false);
+        compile(target, scope, pollute);
+        if (target.size() != start) target.setDebug(start);
     }
 
     public Location loc() { return _loc; }

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

@@ -10,17 +10,17 @@ 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) {
+        public Pair(String name, Statement value, Location location) {
             this.name = name;
             this.value = value;
+            this.location = location;
         }
     }
 
     public final List<Pair> values;
 
-    @Override
-    public boolean pollutesStack() { return false; }
     @Override
     public void declare(ScopeRecord varsScope) {
         for (var key : values) {
@@ -28,21 +28,27 @@ public class VariableDeclareStatement extends Statement {
         }
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var entry : values) {
             if (entry.name == null) continue;
             var key = scope.getKey(entry.name);
-            if (key instanceof String) target.add(Instruction.makeVar((String)key).locate(loc()));
+            int start = target.size();
+
+            if (key instanceof String) target.add(Instruction.makeVar((String)key).locate(entry.location));
 
             if (entry.value instanceof FunctionStatement) {
                 ((FunctionStatement)entry.value).compile(target, scope, entry.name, false);
-                target.add(Instruction.storeVar(key).locate(loc()));
+                target.add(Instruction.storeVar(key).locate(entry.location));
             }
             else if (entry.value != null) {
-                entry.value.compileWithPollution(target, scope);
-                target.add(Instruction.storeVar(key).locate(loc()));
+                entry.value.compile(target, scope, true);
+                target.add(Instruction.storeVar(key).locate(entry.location));
             }
+
+            if (target.size() != start) target.setDebug(start);
         }
+
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public VariableDeclareStatement(Location loc, List<Pair> values) {

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

@@ -1,8 +1,7 @@
-package me.topchetoeu.jscript.compilation.values;
-
-import java.util.List;
+package me.topchetoeu.jscript.compilation.control;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,24 +9,23 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class ArrayStatement extends Statement {
     public final Statement[] statements;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadArr(statements.length).locate(loc()));
         var i = 0;
         for (var el : statements) {
             if (el != null) {
                 target.add(Instruction.dup().locate(loc()));
                 target.add(Instruction.loadValue(i).locate(loc()));
-                el.compileWithPollution(target, scope);
+                el.compile(target, scope, true);
                 target.add(Instruction.storeMember().locate(loc()));
             }
             i++;
         }
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public ArrayStatement(Location loc, Statement[] statements) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,11 +10,9 @@ public class BreakStatement extends Statement {
     public final String label;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop("break", label).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public BreakStatement(Location loc, String label) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,11 +10,9 @@ public class ContinueStatement extends Statement {
     public final String label;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop("cont", label).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public ContinueStatement(Location loc, String label) {

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

@@ -1,19 +1,16 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class DebugStatement extends Statement {
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.debug().locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public DebugStatement(Location loc) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,13 +11,12 @@ public class DeleteStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return true; }
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.compile(target, scope, true);
+        key.compile(target, scope, true);
 
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        value.compile(target, scope);
-        key.compile(target, scope);
         target.add(Instruction.delete().locate(loc()));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public DeleteStatement(Location loc, Statement key, Statement value) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
@@ -14,19 +13,16 @@ public class DoWhileStatement extends Statement {
     public final Statement condition, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             int start = target.size();
-            body.compileNoPollution(target, scope);
+            body.compile(target, scope, false);
             int end = target.size();
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 WhileStatement.replaceBreaks(target, label, start, end, end + 1, end + 1);
@@ -35,13 +31,14 @@ public class DoWhileStatement extends Statement {
                 target.add(Instruction.jmp(start - end).locate(loc()));
                 WhileStatement.replaceBreaks(target, label, start, end, start, end + 1);
             }
+            if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
             return;
         }
 
         int start = target.size();
-        body.compileNoPollution(target, scope, true);
+        body.compileWithDebug(target, scope, false);
         int mid = target.size();
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
         int end = target.size();
 
         WhileStatement.replaceBreaks(target, label, start, mid - 1, mid, end + 1);

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -13,9 +12,7 @@ public class ForInStatement extends Statement {
     public final boolean isDeclaration;
     public final Statement varValue, object, body;
     public final String label;
-
-    @Override
-    public boolean pollutesStack() { return false; }
+    public final Location varLocation;
 
     @Override
     public void declare(ScopeRecord globScope) {
@@ -24,54 +21,48 @@ public class ForInStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var key = scope.getKey(varName);
+
+        int first = target.size();
         if (key instanceof String) target.add(Instruction.makeVar((String)key));
 
         if (varValue != null) {
-            varValue.compileWithPollution(target, scope);
+            varValue.compile(target, scope, true);
             target.add(Instruction.storeVar(scope.getKey(varName)));
         }
 
-        object.compileWithPollution(target, scope);
-        target.add(Instruction.keys());
+        object.compileWithDebug(target, scope, true);
+        target.add(Instruction.keys(true));
 
         int start = target.size();
         target.add(Instruction.dup());
-        target.add(Instruction.loadMember("length"));
-        target.add(Instruction.loadValue(0));
-        target.add(Instruction.operation(Operation.LESS_EQUALS));
+        target.add(Instruction.loadValue(null));
+        target.add(Instruction.operation(Operation.EQUALS));
         int mid = target.size();
         target.add(Instruction.nop());
 
-        target.add(Instruction.dup());
-        target.add(Instruction.dup());
-        target.add(Instruction.loadMember("length"));
-        target.add(Instruction.loadValue(1));
-        target.add(Instruction.operation(Operation.SUBTRACT));
-        target.add(Instruction.dup(1, 2));
-        target.add(Instruction.loadValue("length"));
-        target.add(Instruction.dup(1, 2));
-        target.add(Instruction.storeMember());
-        target.add(Instruction.loadMember());
+        target.add(Instruction.loadMember("value").locate(varLocation));
+        target.setDebug();
         target.add(Instruction.storeVar(key));
 
-        for (var i = start; i < target.size(); i++) target.get(i).locate(loc());
-
-        body.compileNoPollution(target, scope, true);
-
+        body.compileWithDebug(target, scope, false);
 
         int end = target.size();
 
         WhileStatement.replaceBreaks(target, label, mid + 1, end, start, end + 1);
 
-        target.add(Instruction.jmp(start - end).locate(loc()));
-        target.add(Instruction.discard().locate(loc()));
-        target.set(mid, Instruction.jmpIf(end - mid + 1).locate(loc()));
+        target.add(Instruction.jmp(start - end));
+        target.add(Instruction.discard());
+        target.set(mid, Instruction.jmpIf(end - mid + 1));
+        if (pollute) target.add(Instruction.loadValue(null));
+        target.get(first).locate(loc());
+        target.setDebug(first);
     }
 
-    public ForInStatement(Location loc, String label, boolean isDecl, String varName, Statement varValue, Statement object, Statement body) {
+    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;

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

@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.values.ConstantStatement;
@@ -14,44 +13,43 @@ public class ForStatement extends Statement {
     public final Statement declaration, assignment, condition, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         declaration.declare(globScope);
         body.declare(globScope);
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        declaration.compile(target, scope);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        declaration.compile(target, scope, false);
 
         if (condition instanceof ConstantStatement) {
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 int start = target.size();
-                body.compileNoPollution(target, scope);
+                body.compile(target, scope, false);
                 int mid = target.size();
-                assignment.compileNoPollution(target, scope, true);
+                assignment.compileWithDebug(target, scope, false);
                 int end = target.size();
                 WhileStatement.replaceBreaks(target, label, start, mid, mid, end + 1);
                 target.add(Instruction.jmp(start - target.size()).locate(loc()));
-                return;
+                if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
             }
+            return;
         }
 
         int start = target.size();
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
         int mid = target.size();
         target.add(Instruction.nop());
-        body.compileNoPollution(target, scope);
+        body.compile(target, scope, false);
         int beforeAssign = target.size();
-        assignment.compile(target, scope);
+        assignment.compileWithDebug(target, scope, false);
         int end = target.size();
 
         WhileStatement.replaceBreaks(target, label, mid + 1, end, beforeAssign, end + 1);
 
         target.add(Instruction.jmp(start - end).locate(loc()));
         target.set(mid, Instruction.jmpIfNot(end - mid + 1).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
     @Override
     public Statement optimize() {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.DiscardStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
@@ -14,9 +13,6 @@ import me.topchetoeu.jscript.engine.values.Values;
 public class IfStatement extends Statement {
     public final Statement condition, body, elseBody;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
@@ -24,33 +20,34 @@ public class IfStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)condition).value)) {
-                if (elseBody != null) elseBody.compileNoPollution(target, scope, true);
+                if (elseBody != null) elseBody.compileWithDebug(target, scope, pollute);
             }
             else {
-                body.compileNoPollution(target, scope, true);
+                body.compileWithDebug(target, scope, pollute);
             }
 
             return;
         }
 
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
+
         if (elseBody == null) {
             int i = target.size();
             target.add(Instruction.nop());
-            body.compileNoPollution(target, scope, true);
+            body.compileWithDebug(target, scope, pollute);
             int endI = target.size();
             target.set(i, Instruction.jmpIfNot(endI - i).locate(loc()));
         }
         else {
             int start = target.size();
             target.add(Instruction.nop());
-            body.compileNoPollution(target, scope, true);
+            body.compileWithDebug(target, scope, pollute);
             target.add(Instruction.nop());
             int mid = target.size();
-            elseBody.compileNoPollution(target, scope, true);
+            elseBody.compileWithDebug(target, scope, pollute);
             int end = target.size();
 
             target.set(start, Instruction.jmpIfNot(mid - start).locate(loc()));

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,12 +10,9 @@ public class ReturnStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value == null) target.add(Instruction.loadValue(null).locate(loc()));
-        else value.compileWithPollution(target, scope);
+        else value.compile(target, scope, true);
         target.add(Instruction.ret().locate(loc()));
     }
 

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

@@ -1,9 +1,9 @@
 package me.topchetoeu.jscript.compilation.control;
 
 import java.util.HashMap;
-import java.util.List;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.Instruction.Type;
@@ -21,9 +21,6 @@ public class SwitchStatement extends Statement {
         }
     }
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     public final Statement value;
     public final SwitchCase[] cases;
     public final Statement[] body;
@@ -35,18 +32,18 @@ public class SwitchStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var caseMap = new HashMap<Integer, Integer>();
         var stmIndexMap = new HashMap<Integer, Integer>();
 
-        value.compile(target, scope);
+        value.compile(target, scope, true);
 
         for (var ccase : cases) {
             target.add(Instruction.dup().locate(loc()));
-            ccase.value.compileWithPollution(target, scope);
+            ccase.value.compile(target, scope, true);
             target.add(Instruction.operation(Operation.EQUALS).locate(loc()));
             caseMap.put(target.size(), ccase.statementI);
-            target.add(Instruction.nop());
+            target.add(Instruction.nop().locate(ccase.value.loc()));
         }
 
         int start = target.size();
@@ -55,7 +52,7 @@ public class SwitchStatement extends Statement {
 
         for (var stm : body) {
             stmIndexMap.put(stmIndexMap.size(), target.size());
-            stm.compileNoPollution(target, scope, true);
+            stm.compileWithDebug(target, scope, false);
         }
 
         if (defaultI < 0 || defaultI >= body.length) target.set(start, Instruction.jmp(target.size() - start).locate(loc()));
@@ -71,7 +68,8 @@ public class SwitchStatement extends Statement {
             var loc = target.get(el.getKey()).location;
             var i = stmIndexMap.get(el.getValue());
             if (i == null) i = target.size();
-            target.set(el.getKey(), Instruction.jmpIf(i - el.getKey()).locate(loc).setDebug(true));
+            target.set(el.getKey(), Instruction.jmpIf(i - el.getKey()).locate(loc));
+            target.setDebug(el.getKey());
         }
 
         target.add(Instruction.discard().locate(loc()));

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,11 +10,8 @@ public class ThrowStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        value.compileWithPollution(target, scope);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.compile(target, scope, true);
         target.add(Instruction.throwInstr().locate(loc()));
     }
 

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.GlobalScope;
@@ -15,9 +14,6 @@ public class TryStatement extends Statement {
     public final Statement finallyBody;
     public final String name;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         tryBody.declare(globScope);
@@ -26,30 +22,31 @@ public class TryStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop());
 
         int start = target.size(), tryN, catchN = -1, finN = -1;
 
-        tryBody.compileNoPollution(target, scope);
+        tryBody.compile(target, scope, false);
         tryN = target.size() - start;
 
         if (catchBody != null) {
             int tmp = target.size();
             var local = scope instanceof GlobalScope ? scope.child() : (LocalScopeRecord)scope;
             local.define(name, true);
-            catchBody.compileNoPollution(target, scope);
+            catchBody.compile(target, scope, false);
             local.undefine();
             catchN = target.size() - tmp;
         }
 
         if (finallyBody != null) {
             int tmp = target.size();
-            finallyBody.compileNoPollution(target, scope);
+            finallyBody.compile(target, scope, false);
             finN = target.size() - tmp;
         }
 
         target.set(start - 1, Instruction.tryInstr(tryN, catchN, finN).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public TryStatement(Location loc, Statement tryBody, Statement catchBody, Statement finallyBody, String name) {

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

@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.DiscardStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
@@ -16,19 +15,16 @@ public class WhileStatement extends Statement {
     public final Statement condition, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 int start = target.size();
-                body.compileNoPollution(target, scope);
+                body.compile(target, scope, false);
                 int end = target.size();
                 replaceBreaks(target, label, start, end, start, end + 1);
                 target.add(Instruction.jmp(start - target.size()).locate(loc()));
@@ -37,10 +33,10 @@ public class WhileStatement extends Statement {
         }
 
         int start = target.size();
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
         int mid = target.size();
         target.add(Instruction.nop());
-        body.compileNoPollution(target, scope);
+        body.compile(target, scope, false);
 
         int end = target.size();
 
@@ -48,6 +44,7 @@ public class WhileStatement extends Statement {
 
         target.add(Instruction.jmp(start - end).locate(loc()));
         target.set(mid, Instruction.jmpIfNot(end - mid + 1).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
     @Override
     public Statement optimize() {
@@ -70,7 +67,7 @@ public class WhileStatement extends Statement {
         this.body = body;
     }
 
-    public static void replaceBreaks(List<Instruction> target, String label, int start, int end, int continuePoint, int breakPoint) {
+    public static void replaceBreaks(CompileTarget 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))) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,23 +11,20 @@ public class CallStatement extends Statement {
     public final Statement[] args;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (func instanceof IndexStatement) {
-            ((IndexStatement)func).compile(target, scope, true);
+            ((IndexStatement)func).compile(target, scope, true, true);
         }
         else {
             target.add(Instruction.loadValue(null).locate(loc()));
-            func.compileWithPollution(target, scope);
+            func.compile(target, scope, true);
         }
 
-        for (var arg : args) {
-            arg.compileWithPollution(target, scope);
-        }
+        for (var arg : args) arg.compile(target, scope, true);
 
-        target.add(Instruction.call(args.length).locate(loc()).setDebug(true));
+        target.add(Instruction.call(args.length).locate(loc()));
+        target.setDebug();
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public CallStatement(Location loc, Statement func, Statement ...args) {

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

@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -15,11 +14,13 @@ public class ChangeStatement extends Statement {
     public final boolean postfix;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, scope, postfix);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, scope, true);
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
+        else if (postfix) {
+            target.add(Instruction.loadValue(addAmount));
+            target.add(Instruction.operation(Operation.SUBTRACT));
+        }
     }
 
     public ChangeStatement(Location loc, AssignableStatement value, double addAmount, boolean postfix) {

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

@@ -1,38 +1,38 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
+import java.util.Vector;
 
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class CommaStatement extends Statement {
-    public final Statement first;
-    public final Statement second;
+    public final Statement[] values;
 
     @Override
-    public boolean pollutesStack() { return true; }
-    @Override
-    public boolean pure() { return first.pure() && second.pure(); }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        first.compileNoPollution(target, scope);
-        second.compileWithPollution(target, scope);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        for (var i = 0; i < values.length; i++) {
+            values[i].compile(target, scope, i == values.length - 1 && pollute);
+        }
     }
     
     @Override
     public Statement optimize() {
-        var f = first.optimize();
-        var s = second.optimize();
-        if (f.pure()) return s;
-        else return new CommaStatement(loc(), f, s);
+        var res = new Vector<Statement>(values.length);
+
+        for (var i = 0; i < values.length; i++) {
+            var stm = values[i].optimize();
+            if (i < values.length - 1 && stm.pure()) continue;
+            res.add(stm);
+        }
+
+        if (res.size() == 1) return res.get(0);
+        else return new CommaStatement(loc(), res.toArray(Statement[]::new));
     }
 
-    public CommaStatement(Location loc, Statement first, Statement second) {
+    public CommaStatement(Location loc, Statement ...args) {
         super(loc);
-        this.first = first;
-        this.second = second;
+        this.values = args;
     }
 }

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,14 +9,12 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class ConstantStatement extends Statement {
     public final Object value;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadValue(value).locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (pollute) target.add(Instruction.loadValue(value).locate(loc()));
     }
 
     public ConstantStatement(Location loc, Object val) {

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

@@ -1,9 +1,11 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
+import java.util.Random;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
+import me.topchetoeu.jscript.compilation.FunctionBody;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.Instruction.Type;
@@ -15,17 +17,17 @@ public class FunctionStatement extends Statement {
     public final String name;
     public final String[] args;
 
+    private static Random rand = new Random();
+
     @Override
     public boolean pure() { return name == null; }
-    @Override
-    public boolean pollutesStack() { return true; }
 
     @Override
     public void declare(ScopeRecord scope) {
         if (name != null) scope.define(name);
     }
 
-    public static void checkBreakAndCont(List<Instruction> target, int start) {
+    public static void checkBreakAndCont(CompileTarget 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") ) {
@@ -38,7 +40,7 @@ public class FunctionStatement extends Statement {
         }
     }
 
-    public void compile(List<Instruction> target, ScopeRecord scope, String name, boolean isStatement) {
+    public void compile(CompileTarget target, ScopeRecord scope, String name, boolean isStatement) {
         for (var i = 0; i < args.length; i++) {
             for (var j = 0; j < i; j++) {
                 if (args[i].equals(args[j])){
@@ -50,32 +52,32 @@ public class FunctionStatement extends Statement {
         var subscope = scope.child();
 
         int start = target.size();
+        var funcTarget = new CompileTarget(target.functions, target.breakpoints);
 
-        target.add(Instruction.nop());
         subscope.define("this");
         var argsVar = subscope.define("arguments");
 
         if (args.length > 0) {
             for (var i = 0; i < args.length; i++) {
-                target.add(Instruction.loadVar(argsVar).locate(loc()));
-                target.add(Instruction.loadMember(i).locate(loc()));
-                target.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
+                funcTarget.add(Instruction.loadVar(argsVar).locate(loc()));
+                funcTarget.add(Instruction.loadMember(i).locate(loc()));
+                funcTarget.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
             }
         }
 
         if (!isStatement && this.name != null) {
-            target.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
+            funcTarget.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
         }
 
         body.declare(subscope);
-        target.add(Instruction.debugVarNames(subscope.locals()));
-        body.compile(target, subscope);
+        body.compile(funcTarget, subscope, false);
+        funcTarget.add(Instruction.ret().locate(loc()));
+        checkBreakAndCont(funcTarget, start);
 
-        checkBreakAndCont(target, start);
+        var id = rand.nextLong();
 
-        if (!(body instanceof CompoundStatement)) target.add(Instruction.ret().locate(loc()));
-
-        target.set(start, Instruction.loadFunc(target.size() - start, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
+        target.add(Instruction.loadFunc(id, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
+        target.functions.put(id, new FunctionBody(funcTarget.array(), subscope.captures(), subscope.locals()));
 
         if (name == null) name = this.name;
 
@@ -90,12 +92,14 @@ public class FunctionStatement extends Statement {
             var key = scope.getKey(this.name);
 
             if (key instanceof String) target.add(Instruction.makeVar((String)key).locate(loc()));
-            target.add(Instruction.storeVar(scope.getKey(this.name), true).locate(loc()));
+            target.add(Instruction.storeVar(scope.getKey(this.name), false).locate(loc()));
         }
+
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         compile(target, scope, null, false);
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public FunctionStatement(Location loc, String name, String[] args, CompoundStatement body) {

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

@@ -1,21 +1,18 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class GlobalThisStatement extends Statement {
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadGlob().locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (pollute) target.add(Instruction.loadGlob().locate(loc()));
     }
 
     public GlobalThisStatement(Location loc) {

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

@@ -1,51 +1,40 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.AssignStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
-public class IndexAssignStatement extends AssignStatement {
+public class IndexAssignStatement extends Statement {
     public final Statement object;
     public final Statement index;
     public final Statement value;
     public final Operation operation;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean retPrevValue) {
-        int start = 0;
-
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (operation != null) {
-            object.compileWithPollution(target, scope);
-            index.compileWithPollution(target, scope);
+            object.compile(target, scope, true);
+            index.compile(target, scope, true);
             target.add(Instruction.dup(2, 0).locate(loc()));
 
             target.add(Instruction.loadMember().locate(loc()));
-            if (retPrevValue) {
-                target.add(Instruction.dup().locate(loc()));
-                target.add(Instruction.move(3, 1).locate(loc()));
-            }
-            value.compileWithPollution(target, scope);
+            value.compile(target, scope, true);
             target.add(Instruction.operation(operation).locate(loc()));
 
-            target.add(Instruction.storeMember(!retPrevValue).locate(loc()).setDebug(true));
+            target.add(Instruction.storeMember(pollute).locate(loc()));
+            target.setDebug();
         }
         else {
-            object.compileWithPollution(target, scope);
-            if (retPrevValue) target.add(Instruction.dup().locate(loc()));
-            index.compileWithPollution(target, scope);
-            value.compileWithPollution(target, scope);
+            object.compile(target, scope, true);
+            index.compile(target, scope, true);
+            value.compile(target, scope, true);
 
-            target.add(Instruction.storeMember(!retPrevValue).locate(loc()).setDebug(true));
+            target.add(Instruction.storeMember(pollute).locate(loc()));
+            target.setDebug();
         }
-        target.get(start);
     }
 
     public IndexAssignStatement(Location loc, Statement object, Statement index, Statement value, Operation operation) {

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

@@ -1,10 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.AssignStatement;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -14,31 +12,30 @@ public class IndexStatement extends AssignableStatement {
     public final Statement object;
     public final Statement index;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public AssignStatement toAssign(Statement val, Operation operation) {
+    public Statement toAssign(Statement val, Operation operation) {
         return new IndexAssignStatement(loc(), object, index, val, operation);
     }
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean dupObj) {
-        int start = 0;
-        object.compileWithPollution(target, scope);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean dupObj, boolean pollute) {
+        object.compile(target, scope, true);
         if (dupObj) target.add(Instruction.dup().locate(loc()));
         if (index instanceof ConstantStatement) {
             target.add(Instruction.loadMember(((ConstantStatement)index).value).locate(loc()));
+            target.setDebug();
             return;
         }
 
-        index.compileWithPollution(target, scope);
+        index.compile(target, scope, true);
         target.add(Instruction.loadMember().locate(loc()));
-        target.get(start).setDebug(true);
+        target.setDebug();
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        compile(target, scope, false);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        compile(target, scope, false, pollute);
     }
 
     public IndexStatement(Location loc, Statement object, Statement index) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,29 +10,27 @@ import me.topchetoeu.jscript.engine.values.Values;
 public class LazyAndStatement extends Statement {
     public final Statement first, second;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() {
         return first.pure() && second.pure();
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (first instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)first).value)) {
-                first.compileWithPollution(target, scope);
+                first.compile(target, scope, pollute);
             }
-            else second.compileWithPollution(target, scope);
+            else second.compile(target, scope, pollute);
             return;
         }
 
-        first.compileWithPollution(target, scope);
-        target.add(Instruction.dup().locate(loc()));
+        first.compile(target, scope, true);
+        if (pollute) target.add(Instruction.dup().locate(loc()));
         int start = target.size();
         target.add(Instruction.nop());
-        target.add(Instruction.discard().locate(loc()));
-        second.compileWithPollution(target, scope);
+        if (pollute) target.add(Instruction.discard().locate(loc()));
+        second.compile(target, scope, pollute);
         target.set(start, Instruction.jmpIfNot(target.size() - start).locate(loc()));
     }
 

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,29 +10,27 @@ import me.topchetoeu.jscript.engine.values.Values;
 public class LazyOrStatement extends Statement {
     public final Statement first, second;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() {
         return first.pure() && second.pure();
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (first instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)first).value)) {
-                second.compileWithPollution(target, scope);
+                second.compile(target, scope, pollute);
             }
-            else first.compileWithPollution(target, scope);
+            else first.compile(target, scope, pollute);
             return;
         }
 
-        first.compileWithPollution(target, scope);
-        target.add(Instruction.dup().locate(loc()));
+        first.compile(target, scope, true);
+        if (pollute) target.add(Instruction.dup().locate(loc()));
         int start = target.size();
         target.add(Instruction.nop());
-        target.add(Instruction.discard().locate(loc()));
-        second.compileWithPollution(target, scope);
+        if (pollute) target.add(Instruction.discard().locate(loc()));
+        second.compile(target, scope, pollute);
         target.set(start, Instruction.jmpIf(target.size() - start).locate(loc()));
     }
 

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,16 +11,13 @@ public class NewStatement extends Statement {
     public final Statement[] args;
 
     @Override
-    public boolean pollutesStack() { return true; }
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        func.compile(target, scope, true);
 
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        func.compileWithPollution(target, scope);
-        for (var arg : args) {
-            arg.compileWithPollution(target, scope);
-        }
+        for (var arg : args) arg.compile(target, scope, true);
 
-        target.add(Instruction.callNew(args.length).locate(loc()).setDebug(true));
+        target.add(Instruction.callNew(args.length).locate(loc()));
+        target.setDebug();
     }
 
     public NewStatement(Location loc, Statement func, Statement ...args) {

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

@@ -1,10 +1,10 @@
 package me.topchetoeu.jscript.compilation.values;
 
 import java.util.ArrayList;
-import java.util.List;
 import java.util.Map;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -15,10 +15,7 @@ public class ObjectStatement extends Statement {
     public final Map<Object, FunctionStatement> setters;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadObj().locate(loc()));
 
         for (var el : map.entrySet()) {
@@ -26,7 +23,7 @@ public class ObjectStatement extends Statement {
             target.add(Instruction.loadValue(el.getKey()).locate(loc()));
             var val = el.getValue();
             if (val instanceof FunctionStatement) ((FunctionStatement)val).compile(target, scope, el.getKey().toString(), false);
-            else val.compileWithPollution(target, scope);
+            else val.compile(target, scope, true);
             target.add(Instruction.storeMember().locate(loc()));
         }
 
@@ -38,14 +35,16 @@ public class ObjectStatement extends Statement {
             if (key instanceof String) target.add(Instruction.loadValue((String)key).locate(loc()));
             else target.add(Instruction.loadValue((Double)key).locate(loc()));
 
-            if (getters.containsKey(key)) getters.get(key).compileWithPollution(target, scope);
+            if (getters.containsKey(key)) getters.get(key).compile(target, scope, true);
             else target.add(Instruction.loadValue(null).locate(loc()));
 
-            if (setters.containsKey(key)) setters.get(key).compileWithPollution(target, scope);
+            if (setters.containsKey(key)) setters.get(key).compile(target, scope, true);
             else target.add(Instruction.loadValue(null).locate(loc()));
 
             target.add(Instruction.defProp().locate(loc()));
         }
+
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public ObjectStatement(Location loc, Map<Object, Statement> map, Map<Object, FunctionStatement> getters, Map<Object, FunctionStatement> setters) {

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.control.ThrowStatement;
@@ -16,15 +15,15 @@ public class OperationStatement extends Statement {
     public final Operation operation;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var arg : args) {
-            arg.compileWithPollution(target, scope);
+            arg.compile(target, scope, true);
         }
-        target.add(Instruction.operation(operation).locate(loc()));
+
+        if (pollute) target.add(Instruction.operation(operation).locate(loc()));
+        else target.add(Instruction.discard().locate(loc()));
     }
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() {
         for (var arg : args) {
@@ -50,13 +49,8 @@ public class OperationStatement extends Statement {
                 vals[i] = ((ConstantStatement)args[i]).value;
             }
 
-            try {
-                return new ConstantStatement(loc(), Values.operation(null, operation, vals));
-            }
-            catch (EngineException e) {
-                return new ThrowStatement(loc(), new ConstantStatement(loc(), e.value));
-            }
-            catch (InterruptedException e) { return null; }
+            try { return new ConstantStatement(loc(), Values.operation(null, operation, vals)); }
+            catch (EngineException e) { return new ThrowStatement(loc(), new ConstantStatement(loc(), e.value)); }
         }
 
         return new OperationStatement(loc(), operation, args);

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

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,14 +9,13 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class RegexStatement extends Statement {
     public final String pattern, flags;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadRegex(pattern, flags).locate(loc()));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public RegexStatement(Location loc, String pattern, String flags) {

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

@@ -1,58 +0,0 @@
-package me.topchetoeu.jscript.compilation.values;
-
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.Instruction;
-import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
-import me.topchetoeu.jscript.engine.values.Values;
-
-public class TernaryStatement extends Statement {
-    public final Statement condition;
-    public final Statement first;
-    public final Statement second;
-
-    @Override
-    public boolean pollutesStack() { return true; }
-    @Override
-    public boolean pure() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        if (condition instanceof ConstantStatement) {
-            if (!Values.toBoolean(((ConstantStatement)condition).value)) {
-                second.compileWithPollution(target, scope);
-            }
-            else first.compileWithPollution(target, scope);
-            return;
-        }
-
-        condition.compileWithPollution(target, scope);
-        int start = target.size();
-        target.add(Instruction.nop());
-        first.compileWithPollution(target, scope);
-        int mid = target.size();
-        target.add(Instruction.nop());
-        second.compileWithPollution(target, scope);
-        int end = target.size();
-
-        target.set(start, Instruction.jmpIfNot(mid - start + 1).locate(loc()));
-        target.set(mid, Instruction.jmp(end - mid).locate(loc()));
-    }
-
-    @Override
-    public Statement optimize() {
-        var cond = condition.optimize();
-        var f = first.optimize();
-        var s = second.optimize();
-        return new TernaryStatement(loc(), cond, f, s);
-    }
-
-    public TernaryStatement(Location loc, Statement condition, Statement first, Statement second) {
-        super(loc);
-        this.condition = condition;
-        this.first = first;
-        this.second = second;
-    }
-}

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

@@ -1,23 +1,21 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.control.ArrayStatement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 import me.topchetoeu.jscript.engine.values.Values;
 
 public class TypeofStatement extends Statement {
     public final Statement value;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value instanceof VariableStatement) {
             var i = scope.getKey(((VariableStatement)value).name);
             if (i instanceof String) {
@@ -25,7 +23,7 @@ public class TypeofStatement extends Statement {
                 return;
             }
         }
-        value.compileWithPollution(target, scope);
+        value.compile(target, scope, pollute);
         target.add(Instruction.typeof().locate(loc()));
     }
 

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

@@ -1,38 +1,31 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.compilation.AssignStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.Operation;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
-public class VariableAssignStatement extends AssignStatement {
+public class VariableAssignStatement extends Statement {
     public final String name;
     public final Statement value;
     public final Operation operation;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean retPrevValue) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var i = scope.getKey(name);
         if (operation != null) {
             target.add(Instruction.loadVar(i).locate(loc()));
-            if (retPrevValue) target.add(Instruction.dup().locate(loc()));
             if (value instanceof FunctionStatement) ((FunctionStatement)value).compile(target, scope, name, false);
-            else value.compileWithPollution(target, scope);
+            else value.compile(target, scope, true);
             target.add(Instruction.operation(operation).locate(loc()));
-            target.add(Instruction.storeVar(i, !retPrevValue).locate(loc()));
+            target.add(Instruction.storeVar(i, pollute).locate(loc()));
         }
         else {
-            if (retPrevValue) target.add(Instruction.loadVar(i).locate(loc()));
             if (value instanceof FunctionStatement) ((FunctionStatement)value).compile(target, scope, name, false);
-            else value.compileWithPollution(target, scope);
-            target.add(Instruction.storeVar(i, !retPrevValue).locate(loc()));
+            else value.compile(target, scope, true);
+            target.add(Instruction.storeVar(i, pollute).locate(loc()));
         }
     }
 

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

@@ -1,23 +1,20 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class VariableIndexStatement extends Statement {
     public final int index;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadVar(index).locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (pollute) target.add(Instruction.loadVar(index).locate(loc()));
     }
 
     public VariableIndexStatement(Location loc, int i) {

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

@@ -1,10 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.AssignStatement;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -13,20 +11,19 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class VariableStatement extends AssignableStatement {
     public final String name;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public AssignStatement toAssign(Statement val, Operation operation) {
+    public Statement toAssign(Statement val, Operation operation) {
         return new VariableAssignStatement(loc(), name, val, operation);
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var i = scope.getKey(name);
         target.add(Instruction.loadVar(i).locate(loc()));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public VariableStatement(Location loc, String name) {

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

@@ -1,22 +1,18 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 
 public class VoidStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        if (value != null) value.compileNoPollution(target, scope);
-        target.add(Instruction.loadValue(null).locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (value != null) value.compile(target, scope, false);
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     @Override

src/me/topchetoeu/jscript/engine/Context.java

@@ -1,20 +1,59 @@
 package me.topchetoeu.jscript.engine;
 
+import java.util.Stack;
+import java.util.TreeSet;
+
+import me.topchetoeu.jscript.Filename;
+import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
+import me.topchetoeu.jscript.engine.values.ObjectValue;
 import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.parsing.Parsing;
 
 public class Context {
-    public final FunctionContext function;
-    public final MessageContext message;
+    private final Stack<Environment> env = new Stack<>();
+    public final Data data;
+    public final Engine engine;
 
-    public FunctionValue compile(String filename, String raw) throws InterruptedException {
-        var res = Values.toString(this, function.compile.call(this, null, raw, filename));
-        return Parsing.compile(function, filename, res);
+    public Environment environment() {
+        return env.empty() ? null : env.peek();
     }
 
-    public Context(FunctionContext funcCtx, MessageContext msgCtx) {
-        this.function = funcCtx;
-        this.message = msgCtx;
+    public Context pushEnv(Environment env) {
+        this.env.push(env);
+        return this;
+    }
+    public void popEnv() {
+        if (!env.empty()) this.env.pop();
+    }
+
+    public FunctionValue compile(Filename filename, String raw) {
+        var transpiled = environment().compile.call(this, null, raw, filename.toString());
+        String source = null;
+        FunctionValue runner = null;
+
+        if (transpiled instanceof ObjectValue) {
+            source = Values.toString(this, Values.getMember(this, transpiled, "source"));
+            var _runner = Values.getMember(this, transpiled, "runner");
+            if (_runner instanceof FunctionValue) runner = (FunctionValue)_runner;
+        }
+        else source = Values.toString(this, transpiled);
+
+        var breakpoints = new TreeSet<Location>();
+        FunctionValue res = Parsing.compile(Engine.functions, breakpoints, environment(), filename, source);
+        engine.onSource(filename, source, breakpoints);
+
+        if (runner != null) res = (FunctionValue)runner.call(this, null, res);
+
+        return res;
+    }
+
+    public Context(Engine engine, Data data) {
+        this.data = new Data(engine.data);
+        if (data != null) this.data.addAll(data);
+        this.engine = engine;
+    }
+    public Context(Engine engine) {
+        this(engine, null);
     }
 }

src/me/topchetoeu/jscript/engine/Data.java

@@ -0,0 +1,71 @@
+package me.topchetoeu.jscript.engine;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@SuppressWarnings("unchecked")
+public class Data {
+    public final Data parent;
+    private HashMap<DataKey<Object>, Object> data = new HashMap<>();
+
+    public Data copy() {
+        return new Data().addAll(this);
+    }
+
+    public Data addAll(Map<DataKey<?>, ?> data) {
+        for (var el : data.entrySet()) {
+            get((DataKey<Object>)el.getKey(), (Object)el.getValue());
+        }
+        return this;
+    }
+    public Data addAll(Data data) {
+        for (var el : data.data.entrySet()) {
+            get((DataKey<Object>)el.getKey(), (Object)el.getValue());
+        }
+        return this;
+    }
+
+    public <T> T remove(DataKey<T> key) {
+        return (T)data.remove(key);
+    }
+    public <T> Data set(DataKey<T> key, T val) {
+        data.put((DataKey<Object>)key, (Object)val);
+        return this;
+    }
+    public <T> T get(DataKey<T> key, T val) {
+        for (var it = this; it != null; it = it.parent) {
+            if (it.data.containsKey(key)) {
+                return (T)it.data.get((DataKey<Object>)key);
+            }
+        }
+
+        set(key, val);
+        return val;
+    }
+    public <T> T get(DataKey<T> key) {
+        for (var it = this; it != null; it = it.parent) {
+            if (it.data.containsKey(key)) return (T)it.data.get((DataKey<Object>)key);
+        }
+        return null;
+    }
+    public boolean has(DataKey<?> key) { return data.containsKey(key); }
+
+    public int increase(DataKey<Integer> key, int n, int start) {
+        int res;
+        set(key, res = get(key, start) + n);
+        return res;
+    }
+    public int increase(DataKey<Integer> key, int n) {
+        return increase(key, n, 0);
+    }
+    public int increase(DataKey<Integer> key) {
+        return increase(key, 1, 0);
+    }
+
+    public Data() {
+        this.parent = null;
+    }
+    public Data(Data parent) {
+        this.parent = parent;
+    }
+}

src/me/topchetoeu/jscript/engine/DataKey.java

@@ -0,0 +1,3 @@
+package me.topchetoeu.jscript.engine;
+
+public class DataKey<T> { }

src/me/topchetoeu/jscript/engine/Engine.java

@@ -1,29 +1,37 @@
 package me.topchetoeu.jscript.engine;
 
+import java.util.HashMap;
+import java.util.TreeSet;
 import java.util.concurrent.LinkedBlockingDeque;
 
+import me.topchetoeu.jscript.Filename;
+import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.FunctionBody;
+import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.engine.debug.DebugController;
+import me.topchetoeu.jscript.engine.frame.CodeFrame;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.events.Awaitable;
 import me.topchetoeu.jscript.events.DataNotifier;
 import me.topchetoeu.jscript.exceptions.EngineException;
+import me.topchetoeu.jscript.exceptions.InterruptException;
 
-public class Engine {
+public class Engine implements DebugController {
     private class UncompiledFunction extends FunctionValue {
-        public final String filename;
+        public final Filename filename;
         public final String raw;
-        public final FunctionContext ctx;
+        private FunctionValue compiled = null;
 
         @Override
-        public Object call(Context ctx, Object thisArg, Object ...args) throws InterruptedException {
-            ctx = new Context(this.ctx, ctx.message);
-            return ctx.compile(filename, raw).call(ctx, thisArg, args);
+        public Object call(Context ctx, Object thisArg, Object ...args) {
+            if (compiled == null) compiled = ctx.compile(filename, raw);
+            return compiled.call(ctx, thisArg, args);
         }
 
-        public UncompiledFunction(FunctionContext ctx, String filename, String raw) {
-            super(filename, 0);
+        public UncompiledFunction(Filename filename, String raw) {
+            super(filename + "", 0);
             this.filename = filename;
             this.raw = raw;
-            this.ctx = ctx; 
         }
     }
 
@@ -32,9 +40,9 @@ public class Engine {
         public final Object thisArg;
         public final Object[] args;
         public final DataNotifier<Object> notifier = new DataNotifier<>();
-        public final MessageContext ctx;
+        public final Context ctx;
 
-        public Task(MessageContext ctx, FunctionValue func, Object thisArg, Object[] args) {
+        public Task(Context ctx, FunctionValue func, Object thisArg, Object[] args) {
             this.ctx = ctx;
             this.func = func;
             this.thisArg = thisArg;
@@ -43,31 +51,60 @@ public class Engine {
     }
 
     private static int nextId = 0;
+    public static final HashMap<Long, FunctionBody> functions = new HashMap<>();
 
     private Thread thread;
     private LinkedBlockingDeque<Task> macroTasks = new LinkedBlockingDeque<>();
     private LinkedBlockingDeque<Task> microTasks = new LinkedBlockingDeque<>();
 
     public final int id = ++nextId;
+    public final Data data = new Data().set(StackData.MAX_FRAMES, 200);
+    public final boolean debugging;
+    private final HashMap<Filename, String> sources = new HashMap<>();
+    private final HashMap<Filename, TreeSet<Location>> bpts = new HashMap<>();
+    private DebugController debugger;
 
-    private void runTask(Task task) throws InterruptedException {
+    public boolean attachDebugger(DebugController debugger) {
+        if (!debugging || this.debugger != null) return false;
+
+        for (var source : sources.entrySet()) {
+            debugger.onSource(source.getKey(), source.getValue(), bpts.get(source.getKey()));
+        }
+
+        this.debugger = debugger;
+        return true;
+    }
+    public boolean detachDebugger() {
+        if (!debugging || this.debugger == null) return false;
+        this.debugger = null;
+        return true;
+    }
+
+    @Override public void onFramePop(Context ctx, CodeFrame frame) {
+        if (debugging && debugger != null) debugger.onFramePop(ctx, frame);
+    }
+    @Override public boolean onInstruction(Context ctx, CodeFrame frame, Instruction instruction, Object returnVal, EngineException error, boolean caught) {
+        if (debugging && debugger != null) return debugger.onInstruction(ctx, frame, instruction, returnVal, error, caught);
+        else return false;
+    }
+    @Override public void onSource(Filename filename, String source, TreeSet<Location> breakpoints) {
+        if (!debugging) return;
+        if (debugger != null) debugger.onSource(filename, source, breakpoints);
+        sources.put(filename, source);
+        bpts.put(filename, breakpoints);
+    }
+
+    private void runTask(Task task) {
         try {
-            task.notifier.next(task.func.call(new Context(null, task.ctx), task.thisArg, task.args));
-        }
-        catch (InterruptedException e) {
-            task.notifier.error(new RuntimeException(e));
-            throw e;
-        }
-        catch (EngineException e) {
-            task.notifier.error(e);
+            task.notifier.next(task.func.call(task.ctx, task.thisArg, task.args));
         }
         catch (RuntimeException e) {
+            if (e instanceof InterruptException) throw e;
             task.notifier.error(e);
-            e.printStackTrace();
         }
     }
-    private void run() {
-        while (true) {
+    public void run(boolean untilEmpty) {
+        while (!untilEmpty || !macroTasks.isEmpty()) {
             try {
                 runTask(macroTasks.take());
 
@@ -75,9 +112,9 @@ public class Engine {
                     runTask(microTasks.take());
                 }
             }
-            catch (InterruptedException e) {
+            catch (InterruptedException | InterruptException e) {
                 for (var msg : macroTasks) {
-                    msg.notifier.error(new RuntimeException(e));
+                    msg.notifier.error(new InterruptException(e));
                 }
                 break;
             }
@@ -86,7 +123,7 @@ public class Engine {
 
     public Thread start() {
         if (this.thread == null) {
-            this.thread = new Thread(this::run, "JavaScript Runner #" + id);
+            this.thread = new Thread(() -> run(false), "JavaScript Runner #" + id);
             this.thread.start();
         }
         return this.thread;
@@ -102,17 +139,17 @@ public class Engine {
         return this.thread != null;
     }
 
-    public Awaitable<Object> pushMsg(boolean micro, MessageContext ctx, FunctionValue func, Object thisArg, Object ...args) {
-        var msg = new Task(ctx, func, thisArg, args);
+    public Awaitable<Object> pushMsg(boolean micro, Context ctx, FunctionValue func, Object thisArg, Object ...args) {
+        var msg = new Task(ctx == null ? new Context(this) : ctx, func, thisArg, args);
         if (micro) microTasks.addLast(msg);
         else macroTasks.addLast(msg);
         return msg.notifier;
     }
-    public Awaitable<Object> pushMsg(boolean micro, Context ctx, String filename, String raw, Object thisArg, Object ...args) {
-        return pushMsg(micro, ctx.message, new UncompiledFunction(ctx.function, filename, raw), thisArg, args);
+    public Awaitable<Object> pushMsg(boolean micro, Context ctx, Filename filename, String raw, Object thisArg, Object ...args) {
+        return pushMsg(micro, ctx, new UncompiledFunction(filename, raw), thisArg, args);
     }
 
-    // public Engine() {
-    //     this.typeRegister = new NativeTypeRegister();
-    // }
+    public Engine(boolean debugging) {
+        this.debugging = debugging;
+    }
 }

src/me/topchetoeu/jscript/engine/Environment.java

@@ -0,0 +1,87 @@
+package me.topchetoeu.jscript.engine;
+
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.engine.scope.GlobalScope;
+import me.topchetoeu.jscript.engine.values.FunctionValue;
+import me.topchetoeu.jscript.engine.values.NativeFunction;
+import me.topchetoeu.jscript.engine.values.ObjectValue;
+import me.topchetoeu.jscript.engine.values.Symbol;
+import me.topchetoeu.jscript.exceptions.EngineException;
+import me.topchetoeu.jscript.interop.Native;
+import me.topchetoeu.jscript.interop.NativeGetter;
+import me.topchetoeu.jscript.interop.NativeSetter;
+import me.topchetoeu.jscript.interop.NativeWrapperProvider;
+
+public class Environment {
+    private HashMap<String, ObjectValue> prototypes = new HashMap<>();
+
+    public final Data data = new Data();
+    public static final HashMap<String, Symbol> symbols = new HashMap<>();
+
+    public GlobalScope global;
+    public WrappersProvider wrappers;
+
+    @Native public FunctionValue compile;
+    @Native public FunctionValue regexConstructor = new NativeFunction("RegExp", (ctx, thisArg, args) -> {
+        throw EngineException.ofError("Regular expressions not supported.").setCtx(ctx.environment(), ctx.engine);
+    });
+
+    public Environment addData(Data data) {
+        this.data.addAll(data);
+        return this;
+    }
+
+    @Native public ObjectValue proto(String name) {
+        return prototypes.get(name);
+    }
+    @Native public void setProto(String name, ObjectValue val) {
+        prototypes.put(name, val);
+    }
+
+    @Native public Symbol symbol(String name) {
+        if (symbols.containsKey(name)) return symbols.get(name);
+        else {
+            var res = new Symbol(name);
+            symbols.put(name, res);
+            return res;
+        }
+    }
+
+    @NativeGetter("global") public ObjectValue getGlobal() {
+        return global.obj;
+    }
+    @NativeSetter("global") public void setGlobal(ObjectValue val) {
+        global = new GlobalScope(val);
+    }
+
+    @Native public Environment fork() {
+        var res = new Environment(compile, null, global);
+        res.wrappers = wrappers.fork(res);
+        res.regexConstructor = regexConstructor;
+        res.prototypes = new HashMap<>(prototypes);
+        return res;
+    }
+    @Native public Environment child() {
+        var res = fork();
+        res.global = res.global.globalChild();
+        return res;
+    }
+
+    public Context context(Engine engine, Data data) {
+        return new Context(engine, data).pushEnv(this);
+    }
+    public Context context(Engine engine) {
+        return new Context(engine).pushEnv(this);
+    }
+
+    public Environment(FunctionValue compile, WrappersProvider nativeConverter, GlobalScope global) {
+        if (compile == null) compile = new NativeFunction("compile", (ctx, thisArg, args) -> args.length == 0 ? "" : args[0]);
+        if (nativeConverter == null) nativeConverter = new NativeWrapperProvider(this);
+        if (global == null) global = new GlobalScope();
+
+        this.wrappers = nativeConverter;
+        this.compile = compile;
+        this.global = global;
+    }
+}

src/me/topchetoeu/jscript/engine/FunctionContext.java

@@ -1,81 +0,0 @@
-package me.topchetoeu.jscript.engine;
-
-import java.util.HashMap;
-
-import me.topchetoeu.jscript.engine.scope.GlobalScope;
-import me.topchetoeu.jscript.engine.values.FunctionValue;
-import me.topchetoeu.jscript.engine.values.NativeFunction;
-import me.topchetoeu.jscript.engine.values.ObjectValue;
-import me.topchetoeu.jscript.exceptions.EngineException;
-import me.topchetoeu.jscript.interop.Native;
-import me.topchetoeu.jscript.interop.NativeGetter;
-import me.topchetoeu.jscript.interop.NativeSetter;
-
-public class FunctionContext {
-    private HashMap<String, ObjectValue> prototypes = new HashMap<>();
-    public GlobalScope global;
-    public WrappersProvider wrappersProvider;
-
-    @Native public FunctionValue compile;
-    @Native public FunctionValue regexConstructor = new NativeFunction("RegExp", (ctx, thisArg, args) -> {
-        throw EngineException.ofError("Regular expressions not supported.");
-    });
-    @Native public ObjectValue proto(String name) {
-        return prototypes.get(name);
-    }
-    @Native public void setProto(String name, ObjectValue val) {
-        prototypes.put(name, val);
-    }
-    // @Native public ObjectValue arrayPrototype = new ObjectValue();
-    // @Native public ObjectValue boolPrototype = new ObjectValue();
-    // @Native public ObjectValue functionPrototype = new ObjectValue();
-    // @Native public ObjectValue numberPrototype = new ObjectValue();
-    // @Native public ObjectValue objectPrototype = new ObjectValue(PlaceholderProto.NONE);
-    // @Native public ObjectValue stringPrototype = new ObjectValue();
-    // @Native public ObjectValue symbolPrototype = new ObjectValue();
-    // @Native public ObjectValue errorPrototype = new ObjectValue();
-    // @Native public ObjectValue syntaxErrPrototype = new ObjectValue(PlaceholderProto.ERROR);
-    // @Native public ObjectValue typeErrPrototype = new ObjectValue(PlaceholderProto.ERROR);
-    // @Native public ObjectValue rangeErrPrototype = new ObjectValue(PlaceholderProto.ERROR);
-
-    @NativeGetter("global")
-    public ObjectValue getGlobal() {
-        return global.obj;
-    }
-    @NativeSetter("global")
-    public void setGlobal(ObjectValue val) {
-        global = new GlobalScope(val);
-    }
-
-    @Native
-    public FunctionContext fork() {
-        var res = new FunctionContext(compile, wrappersProvider, global);
-        res.regexConstructor = regexConstructor;
-        res.prototypes = new HashMap<>(prototypes);
-        return res;
-    }
-
-    @Native
-    public FunctionContext child() {
-        var res = fork();
-        res.global = res.global.globalChild();
-        return res;
-    }
-
-    public FunctionContext(FunctionValue compile, WrappersProvider nativeConverter, GlobalScope global) {
-        if (compile == null) compile = new NativeFunction("compile", (ctx, thisArg, args) -> args.length == 0 ? "" : args[0]);
-        if (nativeConverter == null) nativeConverter = new WrappersProvider() {
-            public ObjectValue getConstr(Class<?> obj) {
-                throw EngineException.ofType("Java objects not passable to Javascript.");
-            }
-            public ObjectValue getProto(Class<?> obj) {
-                throw EngineException.ofType("Java objects not passable to Javascript.");
-            }
-        };
-        if (global == null) global = new GlobalScope();
-
-        this.wrappersProvider = nativeConverter;
-        this.compile = compile;
-        this.global = global;
-    }
-}

src/me/topchetoeu/jscript/engine/MessageContext.java

@@ -1,33 +0,0 @@
-package me.topchetoeu.jscript.engine;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-import me.topchetoeu.jscript.engine.frame.CodeFrame;
-import me.topchetoeu.jscript.exceptions.EngineException;
-
-public class MessageContext {
-    public final Engine engine;
-
-    private final ArrayList<CodeFrame> frames = new ArrayList<>();
-    public int maxStackFrames = 1000;
-
-    public List<CodeFrame> frames() { return Collections.unmodifiableList(frames); }
-
-    public MessageContext pushFrame(CodeFrame frame) {
-        this.frames.add(frame);
-        if (this.frames.size() > maxStackFrames) throw EngineException.ofRange("Stack overflow!");
-        return this;
-    }
-    public boolean popFrame(CodeFrame frame) {
-        if (this.frames.size() == 0) return false;
-        if (this.frames.get(this.frames.size() - 1) != frame) return false;
-        this.frames.remove(this.frames.size() - 1);
-        return true;
-    }
-
-    public MessageContext(Engine engine) {
-        this.engine = engine;
-    }
-}

src/me/topchetoeu/jscript/engine/StackData.java

@@ -0,0 +1,65 @@
+package me.topchetoeu.jscript.engine;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.engine.debug.Debugger;
+import me.topchetoeu.jscript.engine.frame.CodeFrame;
+import me.topchetoeu.jscript.exceptions.EngineException;
+
+public class StackData {
+    public static final DataKey<ArrayList<CodeFrame>> FRAMES = new DataKey<>();
+    public static final DataKey<Integer> MAX_FRAMES = new DataKey<>();
+    public static final DataKey<Debugger> DEBUGGER = new DataKey<>();
+
+    public static void pushFrame(Context ctx, CodeFrame frame) {
+        var frames = ctx.data.get(FRAMES, new ArrayList<>());
+        frames.add(frame);
+        if (frames.size() > ctx.data.get(MAX_FRAMES, 10000)) throw EngineException.ofRange("Stack overflow!");
+        ctx.pushEnv(frame.function.environment);
+    }
+    public static boolean popFrame(Context ctx, CodeFrame frame) {
+        var frames = ctx.data.get(FRAMES, new ArrayList<>());
+        if (frames.size() == 0) return false;
+        if (frames.get(frames.size() - 1) != frame) return false;
+        frames.remove(frames.size() - 1);
+        ctx.popEnv();
+        ctx.engine.onFramePop(ctx, frame);
+        return true;
+    }
+    public static CodeFrame peekFrame(Context ctx) {
+        var frames = ctx.data.get(FRAMES, new ArrayList<>());
+        if (frames.size() == 0) return null;
+        return frames.get(frames.size() - 1);
+    }
+
+    public static List<CodeFrame> frames(Context ctx) {
+        return Collections.unmodifiableList(ctx.data.get(FRAMES, new ArrayList<>()));
+    }
+    public static List<String> stackTrace(Context ctx) {
+        var res = new ArrayList<String>();
+        var frames = frames(ctx);
+
+        for (var i = frames.size() - 1; i >= 0; i--) {
+            var el = frames.get(i);
+            var name = el.function.name;
+            Location loc = null;
+
+            for (var j = el.codePtr; j >= 0 && loc == null; j--) loc = el.function.body[j].location;
+            if (loc == null) loc = el.function.loc();
+
+            var trace = "";
+
+            if (loc != null) trace += "at " + loc.toString() + " ";
+            if (name != null && !name.equals("")) trace += "in " + name + " ";
+
+            trace = trace.trim();
+
+            if (!trace.equals("")) res.add(trace);
+        }
+
+        return res;
+    }
+}

src/me/topchetoeu/jscript/engine/WrappersProvider.java

@@ -1,8 +1,12 @@
 package me.topchetoeu.jscript.engine;
 
+import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.engine.values.ObjectValue;
 
 public interface WrappersProvider {
     public ObjectValue getProto(Class<?> obj);
-    public ObjectValue getConstr(Class<?> obj);
+    public ObjectValue getNamespace(Class<?> obj);
+    public FunctionValue getConstr(Class<?> obj);
+
+    public WrappersProvider fork(Environment env);
 }

src/me/topchetoeu/jscript/engine/debug/DebugController.java

@@ -0,0 +1,40 @@
+package me.topchetoeu.jscript.engine.debug;
+
+import java.util.TreeSet;
+
+import me.topchetoeu.jscript.Filename;
+import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.engine.frame.CodeFrame;
+import me.topchetoeu.jscript.exceptions.EngineException;
+
+public interface DebugController {
+    /**
+     * Called when a script has been loaded
+     * @param breakpoints 
+     */
+    void onSource(Filename filename, String source, TreeSet<Location> breakpoints);
+
+    /**
+     * Called immediatly before an instruction is executed, as well as after an instruction, if it has threw or returned.
+     * This function might pause in order to await debugging commands.
+     * @param ctx The context of execution
+     * @param frame The frame in which execution is occuring
+     * @param instruction The instruction which was or will be executed
+     * @param loc The most recent location the code frame has been at
+     * @param returnVal The return value of the instruction, Runners.NO_RETURN if none
+     * @param error The error that the instruction threw, null if none
+     * @param caught Whether or not the error has been caught
+     * @return Whether or not the frame should restart
+     */
+    boolean onInstruction(Context ctx, CodeFrame frame, Instruction instruction, Object returnVal, EngineException error, boolean caught);
+
+    /**
+     * Called immediatly after a frame has been popped out of the frame stack.
+     * This function might pause in order to await debugging commands.
+     * @param ctx The context of execution
+     * @param frame The code frame which was popped out
+     */
+    void onFramePop(Context ctx, CodeFrame frame);
+}

src/me/topchetoeu/jscript/engine/debug/DebugHandler.java

@@ -0,0 +1,35 @@
+package me.topchetoeu.jscript.engine.debug;
+
+public interface DebugHandler {
+    void enable(V8Message msg);
+    void disable(V8Message msg);
+
+    void setBreakpoint(V8Message msg);
+    void setBreakpointByUrl(V8Message msg);
+    void removeBreakpoint(V8Message msg);
+    void continueToLocation(V8Message msg);
+
+    void getScriptSource(V8Message msg);
+    void getPossibleBreakpoints(V8Message msg);
+
+    void resume(V8Message msg);
+    void pause(V8Message msg);
+
+    void stepInto(V8Message msg);
+    void stepOut(V8Message msg);
+    void stepOver(V8Message msg);
+
+    void setPauseOnExceptions(V8Message msg);
+
+    void evaluateOnCallFrame(V8Message msg);
+
+    void getProperties(V8Message msg);
+    void releaseObjectGroup(V8Message msg);
+    void releaseObject(V8Message msg);
+    /**
+     * This method might not execute the actual code for well-known requests
+     */
+    void callFunctionOn(V8Message msg);
+
+    void runtimeEnable(V8Message msg);
+}

src/me/topchetoeu/jscript/engine/debug/DebugServer.java

@@ -0,0 +1,246 @@
+package me.topchetoeu.jscript.engine.debug;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.security.MessageDigest;
+import java.util.Base64;
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.Metadata;
+import me.topchetoeu.jscript.engine.debug.WebSocketMessage.Type;
+import me.topchetoeu.jscript.events.Notifier;
+import me.topchetoeu.jscript.exceptions.SyntaxException;
+import me.topchetoeu.jscript.exceptions.UncheckedException;
+import me.topchetoeu.jscript.exceptions.UncheckedIOException;
+import me.topchetoeu.jscript.json.JSON;
+import me.topchetoeu.jscript.json.JSONList;
+import me.topchetoeu.jscript.json.JSONMap;
+
+public class DebugServer {
+    public static String browserDisplayName = Metadata.NAME + "/" + Metadata.VERSION;
+
+    public final HashMap<String, DebuggerProvider> targets = new HashMap<>();
+
+    private final byte[] favicon, index, protocol;
+    private final Notifier connNotifier = new Notifier();
+
+    private static void send(HttpRequest req, String val) throws IOException {
+        req.writeResponse(200, "OK", "application/json", val.getBytes());
+    }
+
+    // SILENCE JAVA
+    private MessageDigest getDigestInstance() {
+        try {
+            return MessageDigest.getInstance("sha1");
+        }
+        catch (Throwable e) { throw new UncheckedException(e); }
+
+    }
+
+    private static Thread runAsync(Runnable func, String name) {
+        var res = new Thread(func);
+        res.setName(name);
+        res.start();
+        return res;
+    }
+
+    private void handle(WebSocket ws, Debugger debugger) {
+        WebSocketMessage raw;
+
+        debugger.connect();
+
+        while ((raw = ws.receive()) != null) {
+            if (raw.type != Type.Text) {
+                ws.send(new V8Error("Expected a text message."));
+                continue;
+            }
+
+            V8Message msg;
+
+            try {
+                msg = new V8Message(raw.textData());
+            }
+            catch (SyntaxException e) {
+                ws.send(new V8Error(e.getMessage()));
+                return;
+            }
+
+            try {
+                switch (msg.name) {
+                    case "Debugger.enable":
+                        connNotifier.next();
+                        debugger.enable(msg); continue;
+                    case "Debugger.disable": debugger.disable(msg); continue;
+
+                    case "Debugger.setBreakpoint": debugger.setBreakpoint(msg); continue;
+                    case "Debugger.setBreakpointByUrl": debugger.setBreakpointByUrl(msg); continue;
+                    case "Debugger.removeBreakpoint": debugger.removeBreakpoint(msg); continue;
+                    case "Debugger.continueToLocation": debugger.continueToLocation(msg); continue;
+
+                    case "Debugger.getScriptSource": debugger.getScriptSource(msg); continue;
+                    case "Debugger.getPossibleBreakpoints": debugger.getPossibleBreakpoints(msg); continue;
+
+                    case "Debugger.resume": debugger.resume(msg); continue;
+                    case "Debugger.pause": debugger.pause(msg); continue;
+
+                    case "Debugger.stepInto": debugger.stepInto(msg); continue;
+                    case "Debugger.stepOut": debugger.stepOut(msg); continue;
+                    case "Debugger.stepOver": debugger.stepOver(msg); continue;
+
+                    case "Debugger.setPauseOnExceptions": debugger.setPauseOnExceptions(msg); continue;
+                    case "Debugger.evaluateOnCallFrame": debugger.evaluateOnCallFrame(msg); continue;
+
+                    case "Runtime.releaseObjectGroup": debugger.releaseObjectGroup(msg); continue;
+                    case "Runtime.releaseObject": debugger.releaseObject(msg); continue;
+                    case "Runtime.getProperties": debugger.getProperties(msg); continue;
+                    case "Runtime.callFunctionOn": debugger.callFunctionOn(msg); continue;
+                    // case "NodeWorker.enable": debugger.nodeWorkerEnable(msg); continue;
+                    case "Runtime.enable": debugger.runtimeEnable(msg); continue;
+                }
+
+                if (
+                    msg.name.startsWith("DOM.") ||
+                    msg.name.startsWith("DOMDebugger.") ||
+                    msg.name.startsWith("Emulation.") ||
+                    msg.name.startsWith("Input.") ||
+                    msg.name.startsWith("Network.") ||
+                    msg.name.startsWith("Page.")
+                ) ws.send(new V8Error("This isn't a browser..."));
+                else ws.send(new V8Error("This API is not supported yet."));
+            }
+            catch (Throwable e) {
+                e.printStackTrace();
+                throw new UncheckedException(e);
+            }
+        }
+
+        debugger.disconnect();
+    }
+    private void onWsConnect(HttpRequest req, Socket socket, DebuggerProvider debuggerProvider) {
+        var key = req.headers.get("sec-websocket-key");
+
+        if (key == null) {
+            req.writeResponse(
+                426, "Upgrade Required", "text/txt",
+                "Expected a WS upgrade".getBytes()
+            );
+            return;
+        }
+
+        var resKey = Base64.getEncoder().encodeToString(getDigestInstance().digest(
+            (key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").getBytes()
+        ));
+
+        req.writeCode(101, "Switching Protocols");
+        req.writeHeader("Connection", "Upgrade");
+        req.writeHeader("Sec-WebSocket-Accept", resKey);
+        req.writeLastHeader("Upgrade", "WebSocket");
+
+        var ws = new WebSocket(socket);
+        var debugger = debuggerProvider.getDebugger(ws, req);
+
+        if (debugger == null) {
+            ws.close();
+            return;
+        }
+
+        runAsync(() -> {
+            try { handle(ws, debugger); }
+            catch (RuntimeException e) {
+                ws.send(new V8Error(e.getMessage()));
+            }
+            finally { ws.close(); debugger.disconnect(); }
+        }, "Debug Handler");
+    }
+
+    public void awaitConnection() {
+        connNotifier.await();
+    }
+
+    public void run(InetSocketAddress address) {
+        try {
+            ServerSocket server = new ServerSocket();
+            server.bind(address);
+
+            try {
+                while (true) {
+                    var socket = server.accept();
+                    var req = HttpRequest.read(socket);
+
+                    if (req == null) continue;
+    
+                    switch (req.path) {
+                        case "/json/version":
+                            send(req, "{\"Browser\":\"" + browserDisplayName + "\",\"Protocol-Version\":\"1.1\"}");
+                            break;
+                        case "/json/list":
+                        case "/json": {
+                            var res = new JSONList();
+
+                            for (var el : targets.entrySet()) {
+                                res.add(new JSONMap()
+                                    .set("description", "JScript debugger")
+                                    .set("favicon", "/favicon.ico")
+                                    .set("id", el.getKey())
+                                    .set("type", "node")
+                                    .set("webSocketDebuggerUrl", "ws://" + address.getHostString() + ":" + address.getPort() + "/" + el.getKey())
+                                );
+                            }
+                            send(req, JSON.stringify(res));
+                            break;
+                        }
+                        case "/json/protocol":
+                            req.writeResponse(200, "OK", "application/json", protocol);
+                            break;
+                        case "/json/new":
+                        case "/json/activate":
+                        case "/json/close":
+                        case "/devtools/inspector.html":
+                            req.writeResponse(
+                                501, "Not Implemented", "text/txt",
+                                "This feature isn't (and probably won't be) implemented.".getBytes()
+                            );
+                            break;
+                        case "/":
+                        case "/index.html":
+                            req.writeResponse(200, "OK", "text/html", index);
+                            break;
+                        case "/favicon.ico":
+                            req.writeResponse(200, "OK", "image/png", favicon);
+                            break;
+                        default:
+                            if (req.path.length() > 1 && targets.containsKey(req.path.substring(1))) {
+                                onWsConnect(req, socket, targets.get(req.path.substring(1)));
+                            }
+                            break;
+                    }
+                }
+            }
+            finally { server.close(); }
+        }
+        catch (IOException e) { throw new UncheckedIOException(e); }
+    }
+
+    public Thread start(InetSocketAddress address, boolean daemon) {
+        var res = new Thread(() -> run(address), "Debug Server");
+        res.setDaemon(daemon);
+        res.start();
+        return res;
+    }
+
+    public DebugServer() {
+        try {
+            this.favicon = getClass().getClassLoader().getResourceAsStream("assets/favicon.png").readAllBytes();
+            this.protocol = getClass().getClassLoader().getResourceAsStream("assets/protocol.json").readAllBytes();
+            var index = new String(getClass().getClassLoader().getResourceAsStream("assets/index.html").readAllBytes());
+            this.index = index
+                .replace("${NAME}", Metadata.NAME)
+                .replace("${VERSION}", Metadata.VERSION)
+                .replace("${AUTHOR}", Metadata.AUTHOR)
+                .getBytes();
+        }
+        catch (IOException e) { throw new UncheckedIOException(e); }
+    }
+}

src/me/topchetoeu/jscript/engine/debug/Debugger.java

@@ -0,0 +1,6 @@
+package me.topchetoeu.jscript.engine.debug;
+
+public interface Debugger extends DebugHandler, DebugController {
+    void connect();
+    void disconnect();
+}

src/me/topchetoeu/jscript/engine/debug/DebuggerProvider.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.engine.debug;
+
+public interface DebuggerProvider {
+    Debugger getDebugger(WebSocket socket, HttpRequest req);
+}

src/me/topchetoeu/jscript/engine/debug/HttpRequest.java

@@ -0,0 +1,102 @@
+package me.topchetoeu.jscript.engine.debug;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.net.Socket;
+import java.util.HashMap;
+import java.util.IllegalFormatException;
+import java.util.Map;
+
+public class HttpRequest {
+    public final String method;
+    public final String path;
+    public final Map<String, String> headers;
+    public final OutputStream out;
+
+
+    public void writeCode(int code, String name) {
+        try { out.write(("HTTP/1.1 " + code + " " + name + "\r\n").getBytes()); }
+        catch (IOException e) { }
+    }
+    public void writeHeader(String name, String value) {
+        try { out.write((name + ": " + value + "\r\n").getBytes()); }
+        catch (IOException e) { }
+    }
+    public void writeLastHeader(String name, String value) {
+        try { out.write((name + ": " + value + "\r\n\r\n").getBytes()); }
+        catch (IOException e) { }
+    }
+    public void writeHeadersEnd() {
+        try { out.write("\n".getBytes()); }
+        catch (IOException e) { }
+    }
+
+    public void writeResponse(int code, String name, String type, byte[] data) {
+        writeCode(code, name);
+        writeHeader("Content-Type", type);
+        writeLastHeader("Content-Length", data.length + "");
+        try {
+            out.write(data);
+            out.close();
+        }
+        catch (IOException e) { }
+    }
+    public void writeResponse(int code, String name, String type, InputStream data) {
+        try {
+            writeResponse(code, name, type, data.readAllBytes());
+        }
+        catch (IOException e) { }
+    }
+
+    public HttpRequest(String method, String path, Map<String, String> headers, OutputStream out) {
+        this.method = method;
+        this.path = path;
+        this.headers = headers;
+        this.out = out;
+    }
+
+    // We dont need no http library
+    public static HttpRequest read(Socket socket) {
+        try {
+            var str = socket.getInputStream();
+            var lines = new BufferedReader(new InputStreamReader(str));
+            var line = lines.readLine();
+            var i1 = line.indexOf(" ");
+            var i2 = line.indexOf(" ", i1 + 1);
+
+            if (i1 < 0 || i2 < 0) {
+                socket.close();
+                return null;
+            }
+
+            var method = line.substring(0, i1).trim().toUpperCase();
+            var path = line.substring(i1 + 1, i2).trim();
+            var headers = new HashMap<String, String>();
+
+            while (!(line = lines.readLine()).isEmpty()) {
+                var i = line.indexOf(":");
+                if (i < 0) continue;
+                var name = line.substring(0, i).trim().toLowerCase();
+                var value = line.substring(i + 1).trim();
+
+                if (name.length() == 0) continue;
+                headers.put(name, value);
+            }
+
+            if (headers.containsKey("content-length")) {
+                try {
+                    var i = Integer.parseInt(headers.get("content-length"));
+                    str.skip(i);
+                }
+                catch (IllegalFormatException e) { /* ¯\_(ツ)_/¯ */ }
+            }
+
+            return new HttpRequest(method, path, headers, socket.getOutputStream());
+        }
+        catch (IOException | NullPointerException e) { return null; }
+    }
+}
+

src/me/topchetoeu/jscript/engine/debug/SimpleDebugger.java

@@ -0,0 +1,813 @@
+package me.topchetoeu.jscript.engine.debug;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Random;
+import java.util.TreeSet;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import me.topchetoeu.jscript.Filename;
+import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.compilation.Instruction.Type;
+import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.engine.Engine;
+import me.topchetoeu.jscript.engine.StackData;
+import me.topchetoeu.jscript.engine.frame.CodeFrame;
+import me.topchetoeu.jscript.engine.frame.Runners;
+import me.topchetoeu.jscript.engine.scope.GlobalScope;
+import me.topchetoeu.jscript.engine.values.ArrayValue;
+import me.topchetoeu.jscript.engine.values.CodeFunction;
+import me.topchetoeu.jscript.engine.values.FunctionValue;
+import me.topchetoeu.jscript.engine.values.ObjectValue;
+import me.topchetoeu.jscript.engine.values.Symbol;
+import me.topchetoeu.jscript.engine.values.Values;
+import me.topchetoeu.jscript.events.Notifier;
+import me.topchetoeu.jscript.exceptions.EngineException;
+import me.topchetoeu.jscript.json.JSON;
+import me.topchetoeu.jscript.json.JSONElement;
+import me.topchetoeu.jscript.json.JSONList;
+import me.topchetoeu.jscript.json.JSONMap;
+
+public class SimpleDebugger implements Debugger {
+    public static final String CHROME_GET_PROP_FUNC = "function s(e){let t=this;const n=JSON.parse(e);for(let e=0,i=n.length;e<i;++e)t=t[n[e]];return t}";
+    public static final String VSCODE_STRINGIFY_VAL = "function(...runtimeArgs){\n    let t = 1024; let e = null;\n    if(e)try{let r=\"<<default preview>>\",i=e.call(this,r);if(i!==r)return String(i)}catch(r){return`<<indescribable>>${JSON.stringify([String(r),\"object\"])}`}if(typeof this==\"object\"&&this){let r;for(let i of[Symbol.for(\"debug.description\"),Symbol.for(\"nodejs.util.inspect.custom\")])try{r=this[i]();break}catch{}if(!r&&!String(this.toString).includes(\"[native code]\")&&(r=String(this)),r&&!r.startsWith(\"[object \"))return r.length>=t?r.slice(0,t)+\"\\u2026\":r}\n  ;\n\n}";
+    public static final String VSCODE_STRINGIFY_PROPS = "function(...runtimeArgs){\n    let t = 1024; let e = null;\n    let r={},i=\"<<default preview>>\";if(typeof this!=\"object\"||!this)return r;for(let[n,s]of Object.entries(this)){if(e)try{let o=e.call(s,i);if(o!==i){r[n]=String(o);continue}}catch(o){r[n]=`<<indescribable>>${JSON.stringify([String(o),n])}`;continue}if(typeof s==\"object\"&&s){let o;for(let a of runtimeArgs[0])try{o=s[a]();break}catch{}!o&&!String(s.toString).includes(\"[native code]\")&&(o=String(s)),o&&!o.startsWith(\"[object \")&&(r[n]=o.length>=t?o.slice(0,t)+\"\\u2026\":o)}}return r\n  ;\n\n}";
+    public static final String VSCODE_SYMBOL_REQUEST = "function(){return[Symbol.for(\"debug.description\"),Symbol.for(\"nodejs.util.inspect.custom\")]\n}";
+    public static final String VSCODE_SHALLOW_COPY = "function(){let t={__proto__:this.__proto__\n},e=Object.getOwnPropertyNames(this);for(let r=0;r<e.length;++r){let i=e[r],n=i>>>0;if(String(n>>>0)===i&&n>>>0!==4294967295)continue;let s=Object.getOwnPropertyDescriptor(this,i);s&&Object.defineProperty(t,i,s)}return t}";
+    public static final String VSCODE_FLATTEN_ARRAY = "function(t,e){let r={\n},i=t===-1?0:t,n=e===-1?this.length:t+e;for(let s=i;s<n&&s<this.length;++s){let o=Object.getOwnPropertyDescriptor(this,s);o&&Object.defineProperty(r,s,o)}return r}";
+    public static final String VSCODE_CALL = "function(t){return t.call(this)\n}";
+
+    private static enum State {
+        RESUMED,
+        STEPPING_IN,
+        STEPPING_OUT,
+        STEPPING_OVER,
+        PAUSED_NORMAL,
+        PAUSED_EXCEPTION,
+    }
+    private static enum CatchType {
+        NONE,
+        UNCAUGHT,
+        ALL,
+    }
+    private static class Source {
+        public final int id;
+        public final Filename filename;
+        public final String source;
+        public final TreeSet<Location> breakpoints;
+
+        public Source(int id, Filename filename, String source, TreeSet<Location> breakpoints) {
+            this.id = id;
+            this.filename = filename;
+            this.source = source;
+            this.breakpoints = breakpoints;
+        }
+    }
+    private static class Breakpoint {
+        public final int id;
+        public final Location location;
+        public final String condition;
+
+        public Breakpoint(int id, Location location, String condition) {
+            this.id = id;
+            this.location = location;
+            this.condition = condition;
+        }
+    }
+    private static class BreakpointCandidate {
+        public final int id;
+        public final String condition;
+        public final Pattern pattern;
+        public final int line, start;
+        public final HashSet<Breakpoint> resolvedBreakpoints = new HashSet<>();
+
+        public BreakpointCandidate(int id, Pattern pattern, int line, int start, String condition) {
+            this.id = id;
+            this.pattern = pattern;
+            this.line = line;
+            this.start = start;
+            if (condition != null && condition.trim().equals("")) condition = null;
+            this.condition = condition;
+        }
+    }
+    private class Frame {
+        public CodeFrame frame;
+        public CodeFunction func;
+        public int id;
+        public ObjectValue local, capture, global, valstack;
+        public JSONMap serialized;
+        public Location location;
+        public boolean debugData = false;
+
+        public void updateLoc(Location loc) {
+            serialized.set("location", serializeLocation(loc));
+            this.location = loc;
+        }
+
+        public Frame(Context ctx, CodeFrame frame, int id) {
+            this.frame = frame;
+            this.func = frame.function;
+            this.id = id;
+            this.local = new ObjectValue();
+            this.location = frame.function.loc();
+
+            this.global = frame.function.environment.global.obj;
+            this.local = frame.getLocalScope(ctx, true);
+            this.capture = frame.getCaptureScope(ctx, true);
+            this.local.setPrototype(ctx, capture);
+            this.capture.setPrototype(ctx, global);
+            this.valstack = frame.getValStackScope(ctx);
+
+            if (location != null) {
+                debugData = true;
+                this.serialized = new JSONMap()
+                    .set("callFrameId", id + "")
+                    .set("functionName", func.name)
+                    .set("location", serializeLocation(location))
+                    .set("scopeChain", new JSONList()
+                        .add(new JSONMap().set("type", "local").set("name", "Local Scope").set("object", serializeObj(ctx, local)))
+                        .add(new JSONMap().set("type", "closure").set("name", "Closure").set("object", serializeObj(ctx, capture)))
+                        .add(new JSONMap().set("type", "global").set("name", "Global Scope").set("object", serializeObj(ctx, global)))
+                        .add(new JSONMap().set("type", "other").set("name", "Value Stack").set("object", serializeObj(ctx, valstack)))
+                    );
+            }
+        }
+    }
+
+    private class RunResult {
+        public final Context ctx;
+        public final Object result;
+        public final EngineException error;
+
+        public RunResult(Context ctx, Object result, EngineException error) {
+            this.ctx = ctx;
+            this.result = result;
+            this.error = error;
+        }
+    }
+
+    public boolean enabled = true;
+    public CatchType execptionType = CatchType.ALL; 
+    public State state = State.RESUMED;
+
+    public final WebSocket ws;
+    public final Engine target;
+
+    private ObjectValue emptyObject = new ObjectValue();
+
+    private HashMap<Integer, BreakpointCandidate> idToBptCand = new HashMap<>();
+
+    private HashMap<Integer, Breakpoint> idToBreakpoint = new HashMap<>();
+    private HashMap<Location, Breakpoint> locToBreakpoint = new HashMap<>();
+    private HashSet<Location> tmpBreakpts = new HashSet<>();
+
+    private HashMap<Filename, Integer> filenameToId = new HashMap<>();
+    private HashMap<Integer, Source> idToSource = new HashMap<>();
+    private ArrayList<Source> pendingSources = new ArrayList<>();
+
+    private HashMap<Integer, Frame> idToFrame = new HashMap<>();
+    private HashMap<CodeFrame, Frame> codeFrameToFrame = new HashMap<>();
+
+    private HashMap<Integer, ObjectValue> idToObject = new HashMap<>();
+    private HashMap<ObjectValue, Integer> objectToId = new HashMap<>();
+    private HashMap<ObjectValue, Context> objectToCtx = new HashMap<>();
+    private HashMap<String, ArrayList<ObjectValue>> objectGroups = new HashMap<>();
+
+    private Notifier updateNotifier = new Notifier(); 
+
+    private int nextId = new Random().nextInt() & 0x7FFFFFFF;
+    private Location prevLocation = null;
+    private Frame stepOutFrame = null, currFrame = null;
+
+    private int nextId() {
+        return nextId++ ^ 1630022591 /* big prime */;
+    }
+
+    private void updateFrames(Context ctx) {
+        var frame = StackData.peekFrame(ctx);
+        if (frame == null) return;
+
+        if (!codeFrameToFrame.containsKey(frame)) {
+            var id = nextId();
+            var fr = new Frame(ctx, frame, id);
+
+            idToFrame.put(id, fr);
+            codeFrameToFrame.put(frame, fr);
+        }
+
+        currFrame = codeFrameToFrame.get(frame);
+    }
+    private JSONList serializeFrames(Context ctx) {
+        var res = new JSONList();
+        var frames = StackData.frames(ctx);
+
+        for (var i = frames.size() - 1; i >= 0; i--) {
+            res.add(codeFrameToFrame.get(frames.get(i)).serialized);
+        }
+
+        return res;
+    }
+
+    private Location correctLocation(Source source, Location loc) {
+        var set = source.breakpoints;
+
+        if (set.contains(loc)) return loc;
+
+        var tail = set.tailSet(loc);
+        if (tail.isEmpty()) return null;
+
+        return tail.first();
+    }
+    private Location deserializeLocation(JSONElement el, boolean correct) {
+        if (!el.isMap()) throw new RuntimeException("Expected location to be a map.");
+        var id = Integer.parseInt(el.map().string("scriptId"));
+        var line = (int)el.map().number("lineNumber") + 1;
+        var column = (int)el.map().number("columnNumber") + 1;
+
+        if (!idToSource.containsKey(id)) throw new RuntimeException(String.format("The specified source %s doesn't exist.", id));
+
+        var res = new Location(line, column, idToSource.get(id).filename);
+        if (correct) res = correctLocation(idToSource.get(id), res);
+        return res;
+    }
+    private JSONMap serializeLocation(Location loc) {
+        var source = filenameToId.get(loc.filename());
+        return new JSONMap()
+            .set("scriptId", source + "")
+            .set("lineNumber", loc.line() - 1)
+            .set("columnNumber", loc.start() - 1);
+    }
+
+    private Integer objectId(Context ctx, ObjectValue obj) {
+        if (objectToId.containsKey(obj)) return objectToId.get(obj);
+        else {
+            int id = nextId();
+            objectToId.put(obj, id);
+            if (ctx != null) objectToCtx.put(obj, ctx);
+            idToObject.put(id, obj);
+            return id;
+        }
+    }
+    private JSONMap serializeObj(Context ctx, Object val) {
+        val = Values.normalize(null, val);
+
+        if (val == Values.NULL) {
+            return new JSONMap()
+                .set("type", "object")
+                .set("subtype", "null")
+                .setNull("value")
+                .set("description", "null");
+        }
+
+        if (val instanceof ObjectValue) {
+            var obj = (ObjectValue)val;
+            var id = objectId(ctx, obj);
+            var type = "object";
+            String subtype = null;
+            String className = null;
+
+            if (obj instanceof FunctionValue) type = "function";
+            if (obj instanceof ArrayValue) subtype = "array";
+
+            try { className = Values.toString(ctx, Values.getMember(ctx, obj.getMember(ctx, "constructor"), "name")); }
+            catch (Exception e) { }
+
+            var res = new JSONMap()
+                .set("type", type)
+                .set("objectId", id + "");
+
+            if (subtype != null) res.set("subtype", subtype);
+            if (className != null) {
+                res.set("className", className);
+                res.set("description", "{ " + className + " }");
+            }
+
+            return res;
+        }
+
+        if (val == null) return new JSONMap().set("type", "undefined");
+        if (val instanceof String) return new JSONMap().set("type", "string").set("value", (String)val);
+        if (val instanceof Boolean) return new JSONMap().set("type", "boolean").set("value", (Boolean)val);
+        if (val instanceof Symbol) return new JSONMap().set("type", "symbol").set("description", val.toString());
+        if (val instanceof Number) {
+            var num = (double)(Number)val;
+            var res = new JSONMap().set("type", "number");
+
+            if (Double.POSITIVE_INFINITY == num) res.set("unserializableValue", "Infinity");
+            else if (Double.NEGATIVE_INFINITY == num) res.set("unserializableValue", "-Infinity");
+            else if (Double.doubleToRawLongBits(num) == Double.doubleToRawLongBits(-0d)) res.set("unserializableValue", "-0");
+            else if (Double.doubleToRawLongBits(num) == Double.doubleToRawLongBits(0d)) res.set("unserializableValue", "0");
+            else if (Double.isNaN(num)) res.set("unserializableValue", "NaN");
+            else res.set("value", num);
+
+            return res;
+        }
+
+        throw new IllegalArgumentException("Unexpected JS object.");
+    }
+    private void setObjectGroup(String name, Object val) {
+        if (val instanceof ObjectValue) {
+            var obj = (ObjectValue)val;
+
+            if (objectGroups.containsKey(name)) objectGroups.get(name).add(obj);
+            else objectGroups.put(name, new ArrayList<>(List.of(obj)));
+        }
+    }
+    private void releaseGroup(String name) {
+        var objs = objectGroups.remove(name);
+
+        if (objs != null) {
+            for (var obj : objs) {
+                var id = objectToId.remove(obj);
+                if (id != null) idToObject.remove(id);
+            }
+        }
+    }
+    private Object deserializeArgument(JSONMap val) {
+        if (val.isString("objectId")) return idToObject.get(Integer.parseInt(val.string("objectId")));
+        else if (val.isString("unserializableValue")) switch (val.string("unserializableValue")) {
+            case "NaN": return Double.NaN;
+            case "-Infinity": return Double.NEGATIVE_INFINITY;
+            case "Infinity": return Double.POSITIVE_INFINITY;
+            case "-0": return -0.;
+        }
+        return JSON.toJs(val.get("value"));
+    }
+
+    private JSONMap serializeException(Context ctx, EngineException err) {
+        String text = null;
+
+        try {
+            text = Values.toString(ctx, err.value);
+        }
+        catch (EngineException e) {
+            text = "[error while stringifying]";
+        }
+
+        var res = new JSONMap()
+            .set("exceptionId", nextId())
+            .set("exception", serializeObj(ctx, err.value))
+            .set("exception", serializeObj(ctx, err.value))
+            .set("text", text);
+
+        return res;
+    }
+
+    private void resume(State state) {
+        this.state = state;
+        ws.send(new V8Event("Debugger.resumed", new JSONMap()));
+        updateNotifier.next();
+    }
+    private void pauseDebug(Context ctx, Breakpoint bp) {
+        state = State.PAUSED_NORMAL;
+        var map = new JSONMap()
+            .set("callFrames", serializeFrames(ctx))
+            .set("reason", "debugCommand");
+
+        if (bp != null) map.set("hitBreakpoints", new JSONList().add(bp.id + ""));
+        ws.send(new V8Event("Debugger.paused", map));
+    }
+    private void pauseException(Context ctx) {
+        state = State.PAUSED_EXCEPTION;
+        var map = new JSONMap()
+            .set("callFrames", serializeFrames(ctx))
+            .set("reason", "exception");
+
+        ws.send(new V8Event("Debugger.paused", map));
+    }
+
+    private void sendSource(Source src) {
+        ws.send(new V8Event("Debugger.scriptParsed", new JSONMap()
+            .set("scriptId", src.id + "")
+            .set("hash", src.source.hashCode())
+            .set("url", src.filename + "")
+        ));
+    }
+
+    private void addBreakpoint(Breakpoint bpt) {
+        idToBreakpoint.put(bpt.id, bpt);
+        locToBreakpoint.put(bpt.location, bpt);
+
+        ws.send(new V8Event("Debugger.breakpointResolved", new JSONMap()
+            .set("breakpointId", bpt.id)
+            .set("location", serializeLocation(bpt.location))
+        ));
+    }
+
+    private RunResult run(Frame codeFrame, String code) {
+        var engine = new Engine(false);
+        var env = codeFrame.func.environment.fork();
+
+        ObjectValue global = env.global.obj,
+            capture = codeFrame.frame.getCaptureScope(null, enabled),
+            local = codeFrame.frame.getLocalScope(null, enabled);
+
+        capture.setPrototype(null, global);
+        local.setPrototype(null, capture);
+        env.global = new GlobalScope(local);
+
+        var ctx = new Context(engine).pushEnv(env);
+        var awaiter = engine.pushMsg(false, ctx, new Filename("jscript", "eval"), code, codeFrame.frame.thisArg, codeFrame.frame.args);
+
+        engine.run(true);
+
+        try { return new RunResult(ctx, awaiter.await(), null); }
+        catch (EngineException e) { return new RunResult(ctx, null, e); }
+    }
+
+    @Override public void enable(V8Message msg) {
+        enabled = true;
+        ws.send(msg.respond());
+
+        for (var el : pendingSources) sendSource(el);
+        pendingSources.clear();
+
+        updateNotifier.next();
+    }
+    @Override public void disable(V8Message msg) {
+        enabled = false;
+        ws.send(msg.respond());
+        updateNotifier.next();
+    }
+
+    @Override public void getScriptSource(V8Message msg) {
+        int id = Integer.parseInt(msg.params.string("scriptId"));
+        ws.send(msg.respond(new JSONMap().set("scriptSource", idToSource.get(id).source)));
+    }
+    @Override public void getPossibleBreakpoints(V8Message msg) {
+        var src = idToSource.get(Integer.parseInt(msg.params.map("start").string("scriptId")));
+        var start = deserializeLocation(msg.params.get("start"), false);
+        var end = msg.params.isMap("end") ? deserializeLocation(msg.params.get("end"), false) : null;
+
+        var res = new JSONList();
+
+        for (var loc : src.breakpoints.tailSet(start, true)) {
+            if (end != null && loc.compareTo(end) > 0) break;
+            res.add(serializeLocation(loc));
+        }
+
+        ws.send(msg.respond(new JSONMap().set("locations", res)));
+    }
+
+    @Override public void pause(V8Message msg) {
+    }
+
+    @Override public void resume(V8Message msg) {
+        resume(State.RESUMED);
+        ws.send(msg.respond(new JSONMap()));
+    }
+
+    @Override public void setBreakpoint(V8Message msg) {
+        // int id = nextId();
+        // var loc = deserializeLocation(msg.params.get("location"), true);
+        // var bpt = new Breakpoint(id, loc, null);
+        // breakpoints.put(loc, bpt);
+        // idToBrpt.put(id, bpt);
+        // ws.send(msg.respond(new JSONMap()
+        //     .set("breakpointId", id)
+        //     .set("actualLocation", serializeLocation(loc))
+        // ));
+    }
+    @Override public void setBreakpointByUrl(V8Message msg) {
+        var line = (int)msg.params.number("lineNumber") + 1;
+        var col = (int)msg.params.number("columnNumber", 0) + 1;
+        var cond = msg.params.string("condition", null);
+
+        if (cond != null) cond  = "(" + cond + ")";
+
+        Pattern regex;
+
+        if (msg.params.isString("url")) regex = Pattern.compile(Pattern.quote(msg.params.string("url")));
+        else regex = Pattern.compile(msg.params.string("urlRegex"));
+
+        var bpcd = new BreakpointCandidate(nextId(), regex, line, col, cond);
+        idToBptCand.put(bpcd.id, bpcd);
+
+        var locs = new JSONList();
+
+        for (var src : idToSource.values()) {
+            if (regex.matcher(src.filename.toString()).matches()) {
+                var loc = correctLocation(src, new Location(line, col, src.filename));
+                if (loc == null) continue;
+                var bp = new Breakpoint(nextId(), loc, bpcd.condition);
+
+                bpcd.resolvedBreakpoints.add(bp);
+                locs.add(serializeLocation(loc));
+                addBreakpoint(bp);
+            }
+        }
+
+        ws.send(msg.respond(new JSONMap()
+            .set("breakpointId", bpcd.id + "")
+            .set("locations", locs)
+        ));
+    }
+    @Override public void removeBreakpoint(V8Message msg) {
+        var id = Integer.parseInt(msg.params.string("breakpointId"));
+
+        if (idToBptCand.containsKey(id)) {
+            var bpcd = idToBptCand.get(id);
+            for (var bp : bpcd.resolvedBreakpoints) {
+                idToBreakpoint.remove(bp.id);
+                locToBreakpoint.remove(bp.location);
+            }
+            idToBptCand.remove(id);
+        }
+        else if (idToBreakpoint.containsKey(id)) {
+            var bp = idToBreakpoint.remove(id);
+            locToBreakpoint.remove(bp.location);
+        }
+        ws.send(msg.respond());
+    }
+    @Override public void continueToLocation(V8Message msg) {
+        var loc = deserializeLocation(msg.params.get("location"), true);
+
+        tmpBreakpts.add(loc);
+
+        resume(State.RESUMED);
+        ws.send(msg.respond());
+    }
+
+    @Override public void setPauseOnExceptions(V8Message msg) {
+        ws.send(new V8Error("i dont wanna to"));
+    }
+
+    @Override public void stepInto(V8Message msg) {
+        if (state == State.RESUMED) ws.send(new V8Error("Debugger is resumed."));
+        else {
+            prevLocation = currFrame.location;
+            stepOutFrame = currFrame;
+            resume(State.STEPPING_IN);
+            ws.send(msg.respond());
+        }
+    }
+    @Override public void stepOut(V8Message msg) {
+        if (state == State.RESUMED) ws.send(new V8Error("Debugger is resumed."));
+        else {
+            prevLocation = currFrame.location;
+            stepOutFrame = currFrame;
+            resume(State.STEPPING_OUT);
+            ws.send(msg.respond());
+        }
+    }
+    @Override public void stepOver(V8Message msg) {
+        if (state == State.RESUMED) ws.send(new V8Error("Debugger is resumed."));
+        else {
+            prevLocation = currFrame.location;
+            stepOutFrame = currFrame;
+            resume(State.STEPPING_OVER);
+            ws.send(msg.respond());
+        }
+    }
+
+    @Override public void evaluateOnCallFrame(V8Message msg) {
+        var cfId = Integer.parseInt(msg.params.string("callFrameId"));
+        var expr = msg.params.string("expression");
+        var group = msg.params.string("objectGroup", null);
+
+        var cf = idToFrame.get(cfId);
+        var res = run(cf, expr);
+
+        if (group != null) setObjectGroup(group, res.result);
+
+        if (res.error != null) ws.send(msg.respond(new JSONMap().set("exceptionDetails", serializeObj(res.ctx, res.result))));
+
+        ws.send(msg.respond(new JSONMap().set("result", serializeObj(res.ctx, res.result))));
+    }
+
+    @Override public void releaseObjectGroup(V8Message msg) {
+        var group = msg.params.string("objectGroup");
+        releaseGroup(group);
+        ws.send(msg.respond());
+    }
+    @Override
+    public void releaseObject(V8Message msg) {
+        var id = Integer.parseInt(msg.params.string("objectId"));
+        var obj = idToObject.remove(id);
+        if (obj != null) objectToId.remove(obj);
+        ws.send(msg.respond());
+    }
+    @Override public void getProperties(V8Message msg) {
+        var obj = idToObject.get(Integer.parseInt(msg.params.string("objectId")));
+
+        var res = new JSONList();
+        var ctx = objectToCtx.get(obj);
+
+        if (obj != emptyObject) {
+            for (var key : obj.keys(true)) {
+                var propDesc = new JSONMap();
+    
+                if (obj.properties.containsKey(key)) {
+                    var prop = obj.properties.get(key);
+    
+                    propDesc.set("name", Values.toString(ctx, key));
+                    if (prop.getter != null) propDesc.set("get", serializeObj(ctx, prop.getter));
+                    if (prop.setter != null) propDesc.set("set", serializeObj(ctx, prop.setter));
+                    propDesc.set("enumerable", obj.memberEnumerable(key));
+                    propDesc.set("configurable", obj.memberConfigurable(key));
+                    propDesc.set("isOwn", true);
+                    res.add(propDesc);
+                }
+                else {
+                    propDesc.set("name", Values.toString(ctx, key));
+                    propDesc.set("value", serializeObj(ctx, obj.getMember(ctx, key)));
+                    propDesc.set("writable", obj.memberWritable(key));
+                    propDesc.set("enumerable", obj.memberEnumerable(key));
+                    propDesc.set("configurable", obj.memberConfigurable(key));
+                    propDesc.set("isOwn", true);
+                    res.add(propDesc);
+                }
+            }
+    
+            var proto = obj.getPrototype(ctx);
+    
+            var protoDesc = new JSONMap();
+            protoDesc.set("name", "__proto__");
+            protoDesc.set("value", serializeObj(ctx, proto == null ? Values.NULL : proto));
+            protoDesc.set("writable", true);
+            protoDesc.set("enumerable", false);
+            protoDesc.set("configurable", false);
+            protoDesc.set("isOwn", true);
+            res.add(protoDesc);
+        }
+
+        ws.send(msg.respond(new JSONMap().set("result", res)));
+    }
+    @Override public void callFunctionOn(V8Message msg) {
+        var src = msg.params.string("functionDeclaration");
+        var args = msg.params
+            .list("arguments", new JSONList())
+            .stream()
+            .map(v -> v.map())
+            .map(this::deserializeArgument)
+            .collect(Collectors.toList());
+
+        var thisArg = idToObject.get(Integer.parseInt(msg.params.string("objectId")));
+        var ctx = objectToCtx.get(thisArg);
+
+        while (true) {
+            var start = src.lastIndexOf("//# sourceURL=");
+            if (start < 0) break;
+            var end = src.indexOf("\n", start);
+            if (end < 0) src = src.substring(0, start);
+            else src = src.substring(0, start) + src.substring(end + 1);
+        }
+
+        try {
+            switch (src) {
+                case CHROME_GET_PROP_FUNC: {
+                    var path = JSON.parse(null, (String)args.get(0)).list();
+                    Object res = thisArg;
+                    for (var el : path) res = Values.getMember(ctx, res, JSON.toJs(el));
+                    ws.send(msg.respond(new JSONMap().set("result", serializeObj(ctx, res))));
+                    return;
+                }
+                case VSCODE_STRINGIFY_VAL:
+                case VSCODE_STRINGIFY_PROPS:
+                case VSCODE_SHALLOW_COPY:
+                case VSCODE_SYMBOL_REQUEST:
+                    ws.send(msg.respond(new JSONMap().set("result", serializeObj(ctx, emptyObject))));
+                    break;
+                case VSCODE_FLATTEN_ARRAY:
+                    ws.send(msg.respond(new JSONMap().set("result", serializeObj(ctx, thisArg))));
+                    break;
+                case VSCODE_CALL: {
+                    var func = (FunctionValue)(args.size() < 1 ? null : args.get(0));
+                    ws.send(msg.respond(new JSONMap().set("result", serializeObj(ctx, func.call(ctx, thisArg)))));
+                    break;
+                }
+                default:
+                    ws.send(new V8Error("Please use well-known functions with callFunctionOn"));
+                    break;
+                // default: {
+                //     var res = ctx.compile(new Filename("jscript", "eval"), src).call(ctx);
+                //     if (res instanceof FunctionValue) ((FunctionValue)res).call(ctx, thisArg, args);
+                //     ws.send(msg.respond(new JSONMap().set("result", serializeObj(ctx, res))));
+                // }
+            }
+        }
+        catch (EngineException e) { ws.send(msg.respond(new JSONMap().set("exceptionDetails", serializeException(ctx, e)))); }
+    }
+
+    @Override
+    public void runtimeEnable(V8Message msg) {
+        ws.send(msg.respond());
+    }
+
+    @Override public void onSource(Filename filename, String source, TreeSet<Location> locations) {
+        int id = nextId();
+        var src = new Source(id, filename, source, locations);
+
+        idToSource.put(id, src);
+        filenameToId.put(filename, id);
+
+        for (var bpcd : idToBptCand.values()) {
+            if (!bpcd.pattern.matcher(filename.toString()).matches()) continue;
+            var loc = correctLocation(src, new Location(bpcd.line, bpcd.start, filename));
+            var bp = new Breakpoint(nextId(), loc, bpcd.condition);
+            if (loc == null) continue;
+            bpcd.resolvedBreakpoints.add(bp);
+            addBreakpoint(bp);
+        }
+
+        if (!enabled) pendingSources.add(src);
+        else sendSource(src);
+    }
+    @Override public boolean onInstruction(Context ctx, CodeFrame cf, Instruction instruction, Object returnVal, EngineException error, boolean caught) {
+        if (!enabled) return false;
+
+        updateFrames(ctx);
+        var frame = codeFrameToFrame.get(cf);
+
+        if (!frame.debugData) return false;
+
+        if (instruction.location != null) frame.updateLoc(instruction.location);
+        var loc = frame.location;
+        var isBreakpointable = loc != null && (
+            idToSource.get(filenameToId.get(loc.filename())).breakpoints.contains(loc) ||
+            returnVal != Runners.NO_RETURN
+        );
+
+        // TODO: FIXXXX
+        // if (error != null && !caught && StackData.frames(ctx).size() > 1) error = null;
+
+        if (error != null && (execptionType == CatchType.ALL || execptionType == CatchType.UNCAUGHT && !caught)) {
+            pauseException(ctx);
+        }
+        else if (isBreakpointable && locToBreakpoint.containsKey(loc)) {
+            var bp = locToBreakpoint.get(loc);
+            var ok = bp.condition == null ? true : Values.toBoolean(run(currFrame, bp.condition).result);
+            if (ok) pauseDebug(ctx, locToBreakpoint.get(loc));
+        }
+        else if (isBreakpointable && tmpBreakpts.remove(loc)) pauseDebug(ctx, null);
+        else if (instruction.type == Type.NOP && instruction.match("debug")) pauseDebug(ctx, null);
+
+        while (enabled) {
+            switch (state) {
+                case PAUSED_EXCEPTION:
+                case PAUSED_NORMAL: break;
+
+                case STEPPING_OUT:
+                case RESUMED: return false;
+                case STEPPING_IN:
+                    if (!prevLocation.equals(loc)) {
+                        if (isBreakpointable) pauseDebug(ctx, null);
+                        else if (returnVal != Runners.NO_RETURN) pauseDebug(ctx, null);
+                        else return false;
+                    }
+                    else return false;
+                    break;
+                case STEPPING_OVER:
+                    if (stepOutFrame.frame == frame.frame) {
+                        if (isBreakpointable && (
+                            !loc.filename().equals(prevLocation.filename()) ||
+                            loc.line() != prevLocation.line()
+                        )) pauseDebug(ctx, null);
+                        else return false;
+                    }
+                    else return false;
+                    break;
+            }
+            updateNotifier.await();
+        }
+
+        return false;
+    }
+    @Override public void onFramePop(Context ctx, CodeFrame frame) {
+        updateFrames(ctx);
+
+        try { idToFrame.remove(codeFrameToFrame.remove(frame).id); }
+        catch (NullPointerException e) { }
+
+        if (StackData.frames(ctx).size() == 0) resume(State.RESUMED);
+        else if (stepOutFrame != null && stepOutFrame.frame == frame &&
+            (state == State.STEPPING_OUT || state == State.STEPPING_IN || state == State.STEPPING_OVER)
+        ) {
+            // if (state == State.STEPPING_OVER) state = State.STEPPING_IN;
+            // else {
+                pauseDebug(ctx, null);
+                updateNotifier.await();
+            // }
+        }
+    }
+
+    @Override public void connect() {
+        if (!target.attachDebugger(this)) {
+            ws.send(new V8Error("A debugger is already attached to this engine."));
+        }
+    }
+    @Override public void disconnect() {
+        target.detachDebugger();
+        enabled = false;
+        updateNotifier.next();
+    }
+
+    public SimpleDebugger(WebSocket ws, Engine target) {
+        this.ws = ws;
+        this.target = target;
+    }
+}