feat: add Number.toFixed

feat: allow adding custom wrappers

.github/workflows/tagged-release.yml

@@ -3,7 +3,7 @@ name: "tagged-release"
 on:
   push:
     tags:
-      - "v*"
+      - "*"
 
 jobs:
   tagged-release:

README.md

@@ -23,7 +23,3 @@ engine.run(true);
 // Get our result
 System.out.println(awaitable.await());
 ```
-
-## NOTE:
-
-To setup the typescript bundle in your sources, run `node build.js init-ts`. This will download the latest version of typescript, minify it, and add it to your src folder. If you are going to work with the `node build.js debug|release` command, this is not a necessary step.

gradle.properties

@@ -1,4 +1,4 @@
 project_group = me.topchetoeu
 project_name = jscript
-project_version = 0.8.6-beta
+project_version = 0.9.27-beta
 main_class = me.topchetoeu.jscript.utils.JScriptRepl

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

@@ -24,6 +24,11 @@ public class Buffer {
         return n;
     }
 
+    public void clear() {
+        data = new byte[128];
+        length = 0;
+    }
+
     public void append(byte b) {
         write(length, new byte[] { b });
     }

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

@@ -5,7 +5,7 @@ import java.io.DataOutputStream;
 import java.io.IOException;
 import java.util.HashMap;
 
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
 
 public class Instruction {
     public static enum Type {

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

@@ -1,6 +1,6 @@
 package me.topchetoeu.jscript.common.events;
 
-import me.topchetoeu.jscript.core.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
 
 public class Notifier {
     private boolean ok = false;

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

@@ -9,12 +9,12 @@ import me.topchetoeu.jscript.compilation.parsing.Operator;
 import me.topchetoeu.jscript.compilation.parsing.ParseRes;
 import me.topchetoeu.jscript.compilation.parsing.Parsing;
 import me.topchetoeu.jscript.compilation.parsing.Token;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 public class JSON {
     public static Object toJs(JSONElement val) {
@@ -32,7 +32,7 @@ public class JSON {
         if (val.isNull()) return Values.NULL;
         return null;
     }
-    private static JSONElement fromJs(Context ctx, Object val, HashSet<Object> prev) {
+    private static JSONElement fromJs(Extensions ext, Object val, HashSet<Object> prev) {
         if (val instanceof Boolean) return JSONElement.bool((boolean)val);
         if (val instanceof Number) return JSONElement.number(((Number)val).doubleValue());
         if (val instanceof String) return JSONElement.string((String)val);
@@ -44,7 +44,7 @@ public class JSON {
             var res = new JSONList();
 
             for (var el : ((ArrayValue)val).toArray()) {
-                var jsonEl = fromJs(ctx, el, prev);
+                var jsonEl = fromJs(ext, el, prev);
                 if (jsonEl == null) jsonEl = JSONElement.NULL;
                 res.add(jsonEl);
             }
@@ -58,8 +58,8 @@ public class JSON {
 
             var res = new JSONMap();
 
-            for (var el : Values.getMembers(ctx, val, false, false)) {
+            for (var el : Values.getMembers(ext, val, false, false)) {
-                var jsonEl = fromJs(ctx, Values.getMember(ctx, val, el), prev);
+                var jsonEl = fromJs(ext, Values.getMember(ext, val, el), prev);
                 if (jsonEl == null) continue;
                 if (el instanceof String || el instanceof Number) res.put(el.toString(), jsonEl);
             }
@@ -70,8 +70,8 @@ public class JSON {
         if (val == null) return null;
         return null;
     }
-    public static JSONElement fromJs(Context ctx, Object val) {
+    public static JSONElement fromJs(Extensions ext, Object val) {
-        return fromJs(ctx, val, new HashSet<>());
+        return fromJs(ext, val, new HashSet<>());
     }
 
     public static ParseRes<String> parseIdentifier(List<Token> tokens, int i) {

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

@@ -14,7 +14,7 @@ import java.util.stream.Collectors;
 import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.Location;
 import me.topchetoeu.jscript.common.Instruction.BreakpointType;
-import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
+import me.topchetoeu.jscript.compilation.scope.LocalScopeRecord;
 import me.topchetoeu.jscript.utils.mapping.SourceMap;
 
 public class FunctionMap {
@@ -104,7 +104,9 @@ public class FunctionMap {
 
         var res = new ArrayList<Location>(candidates.size());
         for (var candidate : candidates.entrySet()) {
-            res.add(candidate.getValue().ceiling(new Location(line, column, candidate.getKey())));
+            var val = correctBreakpoint(new Location(line, column, candidate.getKey()));
+            if (val == null) continue;
+            res.add(val);
         }
 
         return res;

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

@@ -10,7 +10,7 @@ import me.topchetoeu.jscript.common.Location;
 import me.topchetoeu.jscript.common.Instruction.BreakpointType;
 import me.topchetoeu.jscript.common.mapping.FunctionMap;
 import me.topchetoeu.jscript.common.mapping.FunctionMap.FunctionMapBuilder;
-import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
+import me.topchetoeu.jscript.compilation.scope.LocalScopeRecord;
 
 public class CompileResult {
     public final Vector<Instruction> instructions = new Vector<>();

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

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.compilation;
 
 import me.topchetoeu.jscript.common.Instruction;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
 
 public class ThrowSyntaxStatement extends Statement {
     public final String name;

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

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

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

@@ -16,9 +16,9 @@ import me.topchetoeu.jscript.compilation.VariableDeclareStatement.Pair;
 import me.topchetoeu.jscript.compilation.control.*;
 import me.topchetoeu.jscript.compilation.control.SwitchStatement.SwitchCase;
 import me.topchetoeu.jscript.compilation.parsing.ParseRes.State;
+import me.topchetoeu.jscript.compilation.scope.LocalScopeRecord;
 import me.topchetoeu.jscript.compilation.values.*;
-import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
 
 // TODO: this has to be rewritten
 public class Parsing {
@@ -1777,6 +1777,46 @@ public class Parsing {
 
         return ParseRes.res(new ForInStatement(loc, nameLoc, labelRes.result, isDecl, nameRes.result, varVal, objRes.result, bodyRes.result), n);
     }
+    public static ParseRes<ForOfStatement> parseForOf(Filename filename, List<Token> tokens, int i) {
+        var loc = getLoc(filename, tokens, i);
+        int n = 0;
+
+        var labelRes = parseLabel(tokens, i + n);
+        var isDecl = false;
+        n += labelRes.n;
+
+        if (!isIdentifier(tokens, i + n++, "for")) return ParseRes.failed();
+        if (!isOperator(tokens, i + n++, Operator.PAREN_OPEN)) return ParseRes.error(loc, "Expected a open paren after 'for'.");
+
+        if (isIdentifier(tokens, i + n, "var")) {
+            isDecl = true;
+            n++;
+        }
+
+        var nameRes = parseIdentifier(tokens, i + n);
+        if (!nameRes.isSuccess()) return ParseRes.error(loc, "Expected a variable name for 'for' loop.");
+        var nameLoc = getLoc(filename, tokens, i + n);
+        n += nameRes.n;
+
+        if (!isIdentifier(tokens, i + n++, "of")) {
+            if (nameRes.result.equals("const")) return ParseRes.error(loc, "'const' declarations are not supported.");
+            else if (nameRes.result.equals("let")) return ParseRes.error(loc, "'let' declarations are not supported.");
+            else return ParseRes.error(loc, "Expected 'of' keyword after variable declaration.");
+        }
+
+        var objRes = parseValue(filename, tokens, i + n, 0);
+        if (!objRes.isSuccess()) return ParseRes.error(loc, "Expected a value.", objRes);
+        n += objRes.n;
+
+        if (!isOperator(tokens, i + n++, Operator.PAREN_CLOSE)) return ParseRes.error(loc, "Expected a closing paren after for.");
+
+
+        var bodyRes = parseStatement(filename, tokens, i + n);
+        if (!bodyRes.isSuccess()) return ParseRes.error(loc, "Expected a for body.", bodyRes);
+        n += bodyRes.n;
+
+        return ParseRes.res(new ForOfStatement(loc, nameLoc, labelRes.result, isDecl, nameRes.result, objRes.result, bodyRes.result), n);
+    }
     public static ParseRes<TryStatement> parseCatch(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
@@ -1833,6 +1873,7 @@ public class Parsing {
             parseSwitch(filename, tokens, i),
             parseFor(filename, tokens, i),
             parseForIn(filename, tokens, i),
+            parseForOf(filename, tokens, i),
             parseDoWhile(filename, tokens, i),
             parseCatch(filename, tokens, i),
             parseCompound(filename, tokens, i),

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

@@ -1,9 +1,7 @@
-package me.topchetoeu.jscript.core.scope;
+package me.topchetoeu.jscript.compilation.scope;
 
 import java.util.ArrayList;
 
-import me.topchetoeu.jscript.common.ScopeRecord;
-
 public class LocalScopeRecord implements ScopeRecord {
     public final LocalScopeRecord parent;
 

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

@@ -1,6 +1,4 @@
-package me.topchetoeu.jscript.common;
+package me.topchetoeu.jscript.compilation.scope;
-
-import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
 
 public interface ScopeRecord {
     public Object getKey(String name);

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

@@ -7,7 +7,7 @@ import me.topchetoeu.jscript.common.Instruction.Type;
 import me.topchetoeu.jscript.compilation.CompileResult;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
 
 public class FunctionStatement extends Statement {
     public final CompoundStatement body;

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

@@ -1,109 +0,0 @@
-package me.topchetoeu.jscript.core;
-
-import java.util.Iterator;
-import java.util.List;
-
-import me.topchetoeu.jscript.common.Filename;
-import me.topchetoeu.jscript.core.debug.DebugContext;
-import me.topchetoeu.jscript.core.values.CodeFunction;
-import me.topchetoeu.jscript.core.values.FunctionValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
-import me.topchetoeu.jscript.core.scope.ValueVariable;
-
-public class Context implements Extensions {
-    public static final Context NULL = new Context();
-
-    public final Context parent;
-    public final Environment environment;
-    public final Frame frame;
-    // public final Engine engine;
-    public final int stackSize;
-
-    @Override public <T> void add(Key<T> key, T obj) {
-        if (environment != null) environment.add(key, obj);
-        // else if (engine != null) engine.add(key, obj);
-    }
-    @Override public <T> T get(Key<T> key) {
-        if (environment != null && environment.has(key)) return environment.get(key);
-        // else if (engine != null && engine.has(key)) return engine.get(key);
-        return null;
-    }
-    @Override public boolean has(Key<?> key) {
-        return
-            environment != null && environment.has(key);
-            // engine != null && engine.has(key);
-    }
-    @Override public boolean remove(Key<?> key) {
-        var res = false;
-
-        if (environment != null) res |= environment.remove(key);
-        // else if (engine != null) res |= engine.remove(key);
-
-        return res;
-    }
-    @Override public Iterable<Key<?>> keys() {
-        if (environment == null) return List.of();
-        else return environment.keys();
-
-        // if (engine == null && environment == null) return List.of();
-        // if (engine == null) return environment.keys();
-        // if (environment == null) return engine.keys();
-
-        // return () -> Stream.concat(
-        //     StreamSupport.stream(engine.keys().spliterator(), false),
-        //     StreamSupport.stream(environment.keys().spliterator(), false)
-        // ).distinct().iterator();
-    }
-
-    public FunctionValue compile(Filename filename, String raw) {
-        DebugContext.get(this).onSource(filename, raw);
-        var result = new CodeFunction(environment, filename.toString(), Compiler.get(this).compile(filename, raw), new ValueVariable[0]);
-        return result;
-    }
-
-    public Context pushFrame(Frame frame) {
-        var res = new Context(this, frame.function.environment, frame, stackSize + 1);
-        return res;
-    }
-
-    public Iterable<Frame> frames() {
-        var self = this;
-        return () -> new Iterator<Frame>() {
-            private Context curr = self;
-
-            private void update() {
-                while (curr != null && curr.frame == null) curr = curr.parent;
-            }
-
-            @Override public boolean hasNext() {
-                update();
-                return curr != null;
-            }
-            @Override public Frame next() {
-                update();
-                var res = curr.frame;
-                curr = curr.parent;
-                return res;
-            }
-        };
-    }
-
-
-    private Context(Context parent, Environment environment, Frame frame, int stackSize) {
-        this.parent = parent;
-        this.environment = environment;
-        this.frame = frame;
-        this.stackSize = stackSize;
-
-        if (hasNotNull(Environment.MAX_STACK_COUNT) && stackSize > (int)get(Environment.MAX_STACK_COUNT)) {
-            throw EngineException.ofRange("Stack overflow!");
-        }
-    }
-
-    public Context() {
-        this(null, null, null, 0);
-    }
-    public Context(Environment env) {
-        this(null, env, null, 0);
-    }
-}

src/java/me/topchetoeu/jscript/core/Extensions.java

@@ -1,38 +0,0 @@
-package me.topchetoeu.jscript.core;
-
-public interface Extensions {
-    <T> T get(Key<T> key);
-    <T> void add(Key<T> key, T obj);
-    Iterable<Key<?>> keys();
-
-    boolean has(Key<?> key);
-    boolean remove(Key<?> key);
-
-    default void add(Key<Void> key) {
-        add(key, null);
-    }
-
-    default boolean hasNotNull(Key<?> key) {
-        return has(key) && get(key) != null;
-    }
-
-    default <T> T get(Key<T> key, T defaultVal) {
-        if (has(key)) return get(key);
-        else return defaultVal;
-    }
-
-    default <T> T init(Key<T> key, T val) {
-        if (has(key)) return get(key);
-        else {
-            add(key, val);
-            return val;
-        }
-    }
-    @SuppressWarnings("unchecked")
-    default void addAll(Extensions source) {
-        if (source == null) return;
-        for (var key : source.keys()) {
-            add((Key<Object>)key, (Object)source.get(key));
-        }
-    }
-}

src/java/me/topchetoeu/jscript/core/Key.java

@@ -1,5 +0,0 @@
-package me.topchetoeu.jscript.core;
-
-public class Key<T> {
-    
-}

src/java/me/topchetoeu/jscript/core/scope/GlobalScope.java

@@ -1,80 +0,0 @@
-package me.topchetoeu.jscript.core.scope;
-
-import java.util.HashSet;
-import java.util.Set;
-
-import me.topchetoeu.jscript.common.ScopeRecord;
-import me.topchetoeu.jscript.core.Context;
-import me.topchetoeu.jscript.core.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.NativeFunction;
-import me.topchetoeu.jscript.core.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
-
-public class GlobalScope implements ScopeRecord {
-    public final ObjectValue obj;
-
-    public boolean has(Context ctx, String name) {
-        return Values.hasMember(null, obj, name, false);
-    }
-    public Object getKey(String name) {
-        return name;
-    }
-
-    public GlobalScope globalChild() {
-        var obj = new ObjectValue();
-        Values.setPrototype(null, obj, this.obj);
-        return new GlobalScope(obj);
-    }
-    public LocalScopeRecord child() {
-        return new LocalScopeRecord();
-    }
-
-    public Object define(String name) {
-        if (Values.hasMember(Context.NULL, obj, name, false)) return name;
-        obj.defineProperty(Context.NULL, name, null);
-        return name;
-    }
-    public void define(String name, Variable val) {
-        obj.defineProperty(Context.NULL, name,
-            new NativeFunction("get " + name, args -> val.get(args.ctx)),
-            new NativeFunction("set " + name, args -> { val.set(args.ctx, args.get(0)); return null; }),
-            true, true
-        );
-    }
-    public void define(Context ctx, String name, boolean readonly, Object val) {
-        obj.defineProperty(ctx, name, val, readonly, true, true);
-    }
-    public void define(String ...names) {
-        for (var n : names) define(n);
-    }
-    public void define(boolean readonly, FunctionValue val) {
-        define(null, val.name, readonly, val);
-    }
-
-    public Object get(Context ctx, String name) {
-        if (!Values.hasMember(ctx, obj, name, false)) throw EngineException.ofSyntax("The variable '" + name + "' doesn't exist.");
-        else return Values.getMember(ctx, obj, name);
-    }
-    public void set(Context ctx, String name, Object val) {
-        if (!Values.hasMember(ctx, obj, name, false)) throw EngineException.ofSyntax("The variable '" + name + "' doesn't exist.");
-        if (!Values.setMember(ctx, obj, name, val)) throw EngineException.ofSyntax("The global '" + name + "' is readonly.");
-    }
-
-    public Set<String> keys() {
-        var res = new HashSet<String>();
-
-        for (var key : keys()) {
-            if (key instanceof String) res.add((String)key);
-        }
-
-        return res;
-    }
-
-    public GlobalScope() {
-        this.obj = new ObjectValue();
-    }
-    public GlobalScope(ObjectValue val) {
-        this.obj = val;
-    }
-}

src/java/me/topchetoeu/jscript/core/scope/Variable.java

@@ -1,9 +0,0 @@
-package me.topchetoeu.jscript.core.scope;
-
-import me.topchetoeu.jscript.core.Context;
-
-public interface Variable {
-    Object get(Context ctx);
-    default boolean readonly() { return true; }
-    default void set(Context ctx, Object val) { }
-}

src/java/me/topchetoeu/jscript/core/values/NativeWrapper.java

@@ -1,32 +0,0 @@
-package me.topchetoeu.jscript.core.values;
-
-import me.topchetoeu.jscript.core.Context;
-
-public class NativeWrapper extends ObjectValue {
-    private static final Object NATIVE_PROTO = new Object();
-    public final Object wrapped;
-
-    @Override
-    public ObjectValue getPrototype(Context ctx) {
-        if (prototype == NATIVE_PROTO) return ctx.environment.wrappers.getProto(wrapped.getClass());
-        else return super.getPrototype(ctx);
-    }
-
-    @Override
-    public String toString() {
-        return wrapped.toString();
-    }
-    @Override
-    public boolean equals(Object obj) {
-        return wrapped.equals(obj);
-    }
-    @Override
-    public int hashCode() {
-        return wrapped.hashCode();
-    }
-
-    public NativeWrapper(Object wrapped) {
-        this.wrapped = wrapped;
-        prototype = NATIVE_PROTO;
-    }
-}

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

@@ -3,11 +3,11 @@ package me.topchetoeu.jscript.lib;
 import java.util.Iterator;
 import java.util.Stack;
 
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -1,13 +1,14 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.Context;
-import me.topchetoeu.jscript.core.Frame;
-import me.topchetoeu.jscript.core.values.CodeFunction;
-import me.topchetoeu.jscript.core.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.NativeFunction;
-import me.topchetoeu.jscript.core.values.Values;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
 import me.topchetoeu.jscript.lib.PromiseLib.Handle;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.WrapperName;
 
@@ -54,7 +55,7 @@ public class AsyncFunctionLib extends FunctionValue {
                     public void onReject(EngineException err) {
                         next(ctx, Values.NO_RETURN, err);
                     }
-                });
+                }.defer(ctx));
             }
         }
 
@@ -65,8 +66,9 @@ public class AsyncFunctionLib extends FunctionValue {
     }
 
     @Override
-    public Object call(Context ctx, Object thisArg, Object ...args) {
+    public Object call(Extensions ext, Object thisArg, Object ...args) {
         var handler = new AsyncHelper();
+        var ctx = Context.of(ext);
 
         var newArgs = new Object[args.length + 1];
         newArgs[0] = new NativeFunction("await", handler::await);

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

@@ -1,11 +1,12 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
 import me.topchetoeu.jscript.utils.interop.WrapperName;
 
 @WrapperName("AsyncGeneratorFunction")
@@ -13,7 +14,7 @@ public class AsyncGeneratorFunctionLib extends FunctionValue {
     public final CodeFunction func;
 
     @Override
-    public Object call(Context ctx, Object thisArg, Object ...args) {
+    public Object call(Extensions ext, Object thisArg, Object ...args) {
         var handler = new AsyncGeneratorLib();
 
         var newArgs = new Object[args.length + 2];
@@ -21,7 +22,7 @@ public class AsyncGeneratorFunctionLib extends FunctionValue {
         newArgs[1] = new NativeFunction("yield", handler::yield);
         System.arraycopy(args, 0, newArgs, 2, args.length);
 
-        handler.frame = new Frame(ctx, thisArg, newArgs, func);
+        handler.frame = new Frame(Context.of(ext), thisArg, newArgs, func);
         return handler;
     }
 

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

@@ -2,12 +2,12 @@ package me.topchetoeu.jscript.lib;
 
 import java.util.Map;
 
-import me.topchetoeu.jscript.core.Context;
-import me.topchetoeu.jscript.core.Frame;
-import me.topchetoeu.jscript.core.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
 import me.topchetoeu.jscript.lib.PromiseLib.Handle;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Frame;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.WrapperName;
@@ -62,7 +62,7 @@ public class AsyncGeneratorLib {
                 @Override public void onReject(EngineException err) {
                     next(ctx, Values.NO_RETURN, Values.NO_RETURN, err);
                 }
-            });
+            }.defer(ctx));
         }
         else if (state == 2) {
             var obj = new ObjectValue();
@@ -101,7 +101,7 @@ public class AsyncGeneratorLib {
     }
     @Expose public PromiseLib __throw(Arguments args) {
         this.currPromise = new PromiseLib();
-        next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, new EngineException(args.get(0)).setCtx(args.ctx));
+        next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, new EngineException(args.get(0)).setExtensions(args.ctx));
         return this.currPromise;
     }
 }

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

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -2,7 +2,7 @@ package me.topchetoeu.jscript.lib;
 
 import java.io.IOException;
 
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.filesystem.File;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;

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

@@ -4,9 +4,9 @@ import java.util.ArrayList;
 
 import me.topchetoeu.jscript.common.Buffer;
 import me.topchetoeu.jscript.compilation.parsing.Parsing;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeTarget;

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

@@ -1,10 +1,10 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.exceptions.ConvertException;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.runtime.values.Values;
-import me.topchetoeu.jscript.core.exceptions.ConvertException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.filesystem.File;
 import me.topchetoeu.jscript.utils.filesystem.FilesystemException;
 import me.topchetoeu.jscript.utils.interop.Arguments;

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

@@ -4,10 +4,10 @@ import java.io.IOException;
 import java.util.Iterator;
 import java.util.Stack;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.filesystem.ActionType;
 import me.topchetoeu.jscript.utils.filesystem.EntryType;
 import me.topchetoeu.jscript.utils.filesystem.ErrorReason;

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

@@ -1,9 +1,9 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeTarget;

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

@@ -1,25 +1,26 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
 import me.topchetoeu.jscript.utils.interop.WrapperName;
 
 @WrapperName("GeneratorFunction")
 public class GeneratorFunctionLib extends FunctionValue {
     public final CodeFunction func;
 
-    @Override public Object call(Context ctx, Object thisArg, Object ...args) {
+    @Override public Object call(Extensions ext, Object thisArg, Object ...args) {
         var handler = new GeneratorLib();
 
         var newArgs = new Object[args.length + 1];
         newArgs[0] = new NativeFunction("yield", handler::yield);
         System.arraycopy(args, 0, newArgs, 1, args.length);
 
-        handler.frame = new Frame(ctx, thisArg, newArgs, func);
+        handler.frame = new Frame(Context.of(ext), thisArg, newArgs, func);
         return handler;
     }
 

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

@@ -1,10 +1,10 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.WrapperName;
@@ -59,7 +59,7 @@ public class GeneratorLib {
         else return next(args.ctx, args.get(0), Values.NO_RETURN, null);
     }
     @Expose public ObjectValue __throw(Arguments args) {
-        return next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, new EngineException(args.get(0)).setCtx(args.ctx));
+        return next(args.ctx, Values.NO_RETURN, Values.NO_RETURN, new EngineException(args.get(0)).setExtensions(args.ctx));
     }
     @Expose public ObjectValue __return(Arguments args) {
         return next(args.ctx, Values.NO_RETURN, args.get(0), null);

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

@@ -2,18 +2,22 @@ package me.topchetoeu.jscript.lib;
 
 import java.util.HashMap;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Environment;
-import me.topchetoeu.jscript.core.EventLoop;
+import me.topchetoeu.jscript.runtime.EventLoop;
-import me.topchetoeu.jscript.core.Key;
+import me.topchetoeu.jscript.runtime.Key;
-import me.topchetoeu.jscript.core.scope.GlobalScope;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.scope.GlobalScope;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.utils.filesystem.Filesystem;
+import me.topchetoeu.jscript.utils.filesystem.Mode;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeField;
 import me.topchetoeu.jscript.utils.interop.ExposeTarget;
+import me.topchetoeu.jscript.utils.interop.ExposeType;
+import me.topchetoeu.jscript.utils.interop.NativeWrapperProvider;
 import me.topchetoeu.jscript.utils.modules.ModuleRepo;
 
 public class Internals {
@@ -48,7 +52,7 @@ public class Internals {
             try { Thread.sleep(ms, ns); }
             catch (InterruptedException e) { return; }
 
-            args.ctx.get(EventLoop.KEY).pushMsg(() -> func.call(new Context(args.ctx.environment), null, arguments), false);
+            args.ctx.get(EventLoop.KEY).pushMsg(() -> func.call(new Context(args.ctx.extensions), null, arguments), false);
         });
 
         thread.start();
@@ -76,7 +80,7 @@ public class Internals {
                 }
                 catch (InterruptedException e) { return; }
 
-                args.ctx.get(EventLoop.KEY).pushMsg(() -> func.call(new Context(args.ctx.environment), null, arguments), false);
+                args.ctx.get(EventLoop.KEY).pushMsg(() -> func.call(new Context(args.ctx.extensions), null, arguments), false);
             }
         });
         thread.start();
@@ -126,6 +130,19 @@ public class Internals {
         return NumberLib.__isInfinite(args);
     }
 
+    @Expose(target = ExposeTarget.STATIC, type = ExposeType.GETTER)
+    public static FileLib __stdin(Arguments args) {
+        return new FileLib(Filesystem.get(args.ctx).open("std://in", Mode.READ));
+    }
+    @Expose(target = ExposeTarget.STATIC, type = ExposeType.GETTER)
+    public static FileLib __stdout(Arguments args) {
+        return new FileLib(Filesystem.get(args.ctx).open("std://out", Mode.READ));
+    }
+    @Expose(target = ExposeTarget.STATIC, type = ExposeType.GETTER)
+    public static FileLib __stderr(Arguments args) {
+        return new FileLib(Filesystem.get(args.ctx).open("std://err", Mode.READ));
+    }
+
     @ExposeField(target = ExposeTarget.STATIC)
     public static double __NaN = Double.NaN;
     @ExposeField(target = ExposeTarget.STATIC)
@@ -149,35 +166,35 @@ public class Internals {
     }
 
     public static Environment apply(Environment env) {
-        var wp = env.wrappers;
+        var wp = new NativeWrapperProvider();
-        var glob = env.global = new GlobalScope(wp.getNamespace(Internals.class));
+        var glob = new GlobalScope(wp.getNamespace(Internals.class));
 
         glob.define(null, "Math", false, wp.getNamespace(MathLib.class));
         glob.define(null, "JSON", false, wp.getNamespace(JSONLib.class));
         glob.define(null, "Encoding", false, wp.getNamespace(EncodingLib.class));
         glob.define(null, "Filesystem", false, wp.getNamespace(FilesystemLib.class));
 
-        glob.define(false, wp.getConstr(FileLib.class));
+        glob.define(null, false, wp.getConstr(FileLib.class));
 
-        glob.define(false, wp.getConstr(DateLib.class));
+        glob.define(null, false, wp.getConstr(DateLib.class));
-        glob.define(false, wp.getConstr(ObjectLib.class));
+        glob.define(null, false, wp.getConstr(ObjectLib.class));
-        glob.define(false, wp.getConstr(FunctionLib.class));
+        glob.define(null, false, wp.getConstr(FunctionLib.class));
-        glob.define(false, wp.getConstr(ArrayLib.class));
+        glob.define(null, false, wp.getConstr(ArrayLib.class));
 
-        glob.define(false, wp.getConstr(BooleanLib.class));
+        glob.define(null, false, wp.getConstr(BooleanLib.class));
-        glob.define(false, wp.getConstr(NumberLib.class));
+        glob.define(null, false, wp.getConstr(NumberLib.class));
-        glob.define(false, wp.getConstr(StringLib.class));
+        glob.define(null, false, wp.getConstr(StringLib.class));
-        glob.define(false, wp.getConstr(SymbolLib.class));
+        glob.define(null, false, wp.getConstr(SymbolLib.class));
 
-        glob.define(false, wp.getConstr(PromiseLib.class));
+        glob.define(null, false, wp.getConstr(PromiseLib.class));
-        glob.define(false, wp.getConstr(RegExpLib.class));
+        glob.define(null, false, wp.getConstr(RegExpLib.class));
-        glob.define(false, wp.getConstr(MapLib.class));
+        glob.define(null, false, wp.getConstr(MapLib.class));
-        glob.define(false, wp.getConstr(SetLib.class));
+        glob.define(null, false, wp.getConstr(SetLib.class));
 
-        glob.define(false, wp.getConstr(ErrorLib.class));
+        glob.define(null, false, wp.getConstr(ErrorLib.class));
-        glob.define(false, wp.getConstr(SyntaxErrorLib.class));
+        glob.define(null, false, wp.getConstr(SyntaxErrorLib.class));
-        glob.define(false, wp.getConstr(TypeErrorLib.class));
+        glob.define(null, false, wp.getConstr(TypeErrorLib.class));
-        glob.define(false, wp.getConstr(RangeErrorLib.class));
+        glob.define(null, false, wp.getConstr(RangeErrorLib.class));
 
         env.add(Environment.OBJECT_PROTO, wp.getProto(ObjectLib.class));
         env.add(Environment.FUNCTION_PROTO, wp.getProto(FunctionLib.class));
@@ -193,8 +210,12 @@ public class Internals {
         env.add(Environment.TYPE_ERR_PROTO, wp.getProto(TypeErrorLib.class));
         env.add(Environment.RANGE_ERR_PROTO, wp.getProto(RangeErrorLib.class));
 
-        Values.setPrototype(Context.NULL, wp.getProto(ObjectLib.class), null);
         env.add(Environment.REGEX_CONSTR, wp.getConstr(RegExpLib.class));
+        Values.setPrototype(new Context(), wp.getProto(ObjectLib.class), null);
+
+        env.add(NativeWrapperProvider.KEY, wp);
+        env.add(GlobalScope.KEY, glob);
+
 
         return env;
     }

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

@@ -1,8 +1,8 @@
 package me.topchetoeu.jscript.lib;
 
 import me.topchetoeu.jscript.common.json.JSON;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeTarget;

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

@@ -4,10 +4,10 @@ import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.stream.Collectors;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -1,7 +1,9 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import java.text.NumberFormat;
-import me.topchetoeu.jscript.core.values.Values;
+
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
@@ -85,6 +87,14 @@ public class NumberLib {
     @Expose public static String __toString(Arguments args) {
         return Values.toString(args.ctx, args.self);
     }
+    @Expose public static String __toFixed(Arguments args) {
+        var digits = args.getInt(0, 0);
+
+        var nf = NumberFormat.getNumberInstance();
+        nf.setMaximumFractionDigits(digits);
+
+        return nf.format(args.getDouble(-1));
+    }
     @Expose public static double __valueOf(Arguments args) {
         if (Values.isWrapper(args.self, NumberLib.class)) return Values.wrapper(args.self, NumberLib.class).value;
         else return Values.toNumber(args.ctx, args.self);

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

@@ -1,11 +1,11 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Symbol;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -4,16 +4,16 @@ import java.util.ArrayList;
 import java.util.List;
 
 import me.topchetoeu.jscript.common.ResultRunnable;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.EventLoop;
+import me.topchetoeu.jscript.runtime.EventLoop;
-import me.topchetoeu.jscript.core.Extensions;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
@@ -53,26 +53,29 @@ public class PromiseLib {
     private Object val;
 
     private void resolveSynchronized(Context ctx, Object val, int newState) {
-        if (!ctx.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+        this.val = val;
-
+        this.state = newState;
-        ctx.get(EventLoop.KEY).pushMsg(() -> {
+    
-            this.val = val;
+        for (var handle : handles) {
-            this.state = newState;
+            if (newState == STATE_FULFILLED) handle.onFulfil(val);
-
+            if (newState == STATE_REJECTED) {
-            for (var handle : handles) {
+                handle.onReject((EngineException)val);
-                if (newState == STATE_FULFILLED) handle.onFulfil(val);
+                handled = true;
-                if (newState == STATE_REJECTED) {
-                    handle.onReject((EngineException)val);
-                    handled = true;
-                }
             }
+        }
 
-            if (state == STATE_REJECTED && !handled) {
+        if (state == STATE_REJECTED && !handled) {
-                Values.printError(((EngineException)val).setCtx(ctx), "(in promise)");
+            Values.printError(((EngineException)val).setExtensions(ctx), "(in promise)");
-            }
+        }
 
-            handles = null;
+        handles = null;
-        }, true);
+
+        // ctx.get(EventLoop.KEY).pushMsg(() -> {
+        //     if (!ctx.hasNotNull(EventLoop.KEY)) throw EngineException.ofError("No event loop");
+
+
+        //     handles = null;
+        // }, true);
         
     }
     private synchronized void resolve(Context ctx, Object val, int newState) {
@@ -204,7 +207,7 @@ public class PromiseLib {
     }
     @Expose(value = "reject", target = ExposeTarget.STATIC)
     public static PromiseLib __ofRejected(Arguments args) {
-        return ofRejected(args.ctx, new EngineException(args.get(0)).setCtx(args.ctx));
+        return ofRejected(args.ctx, new EngineException(args.get(0)).setExtensions(args.ctx));
     }
 
     @Expose(target = ExposeTarget.STATIC)
@@ -212,7 +215,7 @@ public class PromiseLib {
         if (!(args.get(0) instanceof ArrayValue)) throw EngineException.ofType("Expected argument for any to be an array.");
         var promises = args.convert(0, ArrayValue.class); 
 
-        if (promises.size() == 0) return ofRejected(args.ctx, EngineException.ofError("No promises passed to 'Promise.any'.").setCtx(args.ctx));
+        if (promises.size() == 0) return ofRejected(args.ctx, EngineException.ofError("No promises passed to 'Promise.any'.").setExtensions(args.ctx));
         var n = new int[] { promises.size() };
         var res = new PromiseLib();
         var errors = new ArrayValue();
@@ -227,7 +230,7 @@ public class PromiseLib {
                 public void onReject(EngineException err) {
                     errors.set(args.ctx, index, err.value);
                     n[0]--;
-                    if (n[0] <= 0) res.reject(args.ctx, new EngineException(errors).setCtx(args.ctx));
+                    if (n[0] <= 0) res.reject(args.ctx, new EngineException(errors).setExtensions(args.ctx));
                 }
             });
         }
@@ -387,7 +390,7 @@ public class PromiseLib {
                     return null;
                 }),
                 new NativeFunction(null, _args -> {
-                    res.reject(_args.ctx, new EngineException(_args.get(0)).setCtx(_args.ctx));
+                    res.reject(_args.ctx, new EngineException(_args.get(0)).setExtensions(_args.ctx));
                     return null;
                 })
             );

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

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
 import me.topchetoeu.jscript.utils.interop.ExposeField;

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

@@ -4,12 +4,12 @@ import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.regex.Pattern;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.NativeWrapper;
+import me.topchetoeu.jscript.runtime.values.NativeWrapper;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -4,10 +4,10 @@ import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.stream.Collectors;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -2,13 +2,13 @@ package me.topchetoeu.jscript.lib;
 
 import java.util.regex.Pattern;
 
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Environment;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Symbol;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -3,10 +3,10 @@ package me.topchetoeu.jscript.lib;
 import java.util.HashMap;
 import java.util.Map;
 
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Symbol;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.Expose;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;

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

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
 import me.topchetoeu.jscript.utils.interop.ExposeField;

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

@@ -0,0 +1,18 @@
+package me.topchetoeu.jscript.lib;
+
+import me.topchetoeu.jscript.utils.interop.Arguments;
+import me.topchetoeu.jscript.utils.interop.Expose;
+
+public class ThrowableLib {
+    @Expose public static String __message(Arguments args) {
+        if (args.self instanceof Throwable) return ((Throwable)args.self).getMessage();
+        else return null;
+    }
+    @Expose public static String __name(Arguments args) {
+        return args.self.getClass().getSimpleName();
+    }
+
+    @Expose public static String __toString(Arguments args) {
+        return __name(args) + ": " + __message(args);
+    }
+}

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

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.lib;
 
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 import me.topchetoeu.jscript.utils.interop.ExposeConstructor;
 import me.topchetoeu.jscript.utils.interop.ExposeField;

src/java/me/topchetoeu/jscript/runtime/Childable.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.runtime;
+
+public interface Childable {
+    Object child();
+}

src/java/me/topchetoeu/jscript/runtime/Compiler.java

@@ -1,10 +1,10 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
 import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.FunctionBody;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.runtime.scope.ValueVariable;
-import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
 
 public interface Compiler {
     public Key<Compiler> KEY = new Key<>();

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

@@ -0,0 +1,98 @@
+package me.topchetoeu.jscript.runtime;
+
+import java.util.Iterator;
+import java.util.List;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.runtime.debug.DebugContext;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.scope.ValueVariable;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+
+public class Context implements Extensions {
+    public final Context parent;
+    public final Extensions extensions;
+    public final Frame frame;
+    public final int stackSize;
+
+    @Override public <T> void add(Key<T> key, T obj) {
+        if (extensions != null) extensions.add(key, obj);
+    }
+    @Override public <T> T get(Key<T> key) {
+        if (extensions != null && extensions.has(key)) return extensions.get(key);
+        return null;
+    }
+    @Override public boolean has(Key<?> key) {
+        return extensions != null && extensions.has(key);
+    }
+    @Override public boolean remove(Key<?> key) {
+        var res = false;
+        if (extensions != null) res |= extensions.remove(key);
+        return res;
+    }
+    @Override public Iterable<Key<?>> keys() {
+        if (extensions == null) return List.of();
+        else return extensions.keys();
+    }
+
+    public FunctionValue compile(Filename filename, String raw) {
+        DebugContext.get(this).onSource(filename, raw);
+        var result = new CodeFunction(extensions, filename.toString(), Compiler.get(this).compile(filename, raw), new ValueVariable[0]);
+        return result;
+    }
+
+    public Context pushFrame(Frame frame) {
+        var res = new Context(this, frame.function.extensions, frame, stackSize + 1);
+        return res;
+    }
+
+    public Iterable<Frame> frames() {
+        var self = this;
+        return () -> new Iterator<Frame>() {
+            private Context curr = self;
+
+            private void update() {
+                while (curr != null && curr.frame == null) curr = curr.parent;
+            }
+
+            @Override public boolean hasNext() {
+                update();
+                return curr != null;
+            }
+            @Override public Frame next() {
+                update();
+                var res = curr.frame;
+                curr = curr.parent;
+                return res;
+            }
+        };
+    }
+
+    private Context(Context parent, Extensions ext, Frame frame, int stackSize) {
+        this.parent = parent;
+        this.extensions = ext;
+        this.frame = frame;
+        this.stackSize = stackSize;
+
+        if (hasNotNull(Environment.MAX_STACK_COUNT) && stackSize > (int)get(Environment.MAX_STACK_COUNT)) {
+            throw EngineException.ofRange("Stack overflow!");
+        }
+    }
+
+    public Context() {
+        this(null, null, null, 0);
+    }
+    public Context(Extensions ext) {
+        this(null, clean(ext), null, 0);
+    }
+
+    public static Context of(Extensions ext) {
+        if (ext instanceof Context) return (Context)ext;
+        return new Context(ext);
+    }
+    public static Extensions clean(Extensions ext) {
+        if (ext instanceof Context) return ((Context)ext).extensions;
+        else return ext;
+    }
+}

src/java/me/topchetoeu/jscript/runtime/Copyable.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.runtime;
+
+public interface Copyable {
+    Object copy();
+}

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

@@ -1,12 +1,10 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
 import java.util.concurrent.PriorityBlockingQueue;
 
-import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.ResultRunnable;
 import me.topchetoeu.jscript.common.events.DataNotifier;
-import me.topchetoeu.jscript.core.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
 
 public class Engine implements EventLoop {
     private static class Task<T> implements Comparable<Task<?>> {
@@ -78,18 +76,6 @@ public class Engine implements EventLoop {
         return this.thread != null;
     }
 
-    public DataNotifier<Object> pushMsg(boolean micro, Environment env, FunctionValue func, Object thisArg, Object ...args) {
-        return pushMsg(() -> {
-            return func.call(new Context(env), thisArg, args);
-        }, micro);
-    }
-    public DataNotifier<Object> pushMsg(boolean micro, Environment env, Filename filename, String raw, Object thisArg, Object ...args) {
-        return pushMsg(() -> {
-            var ctx = new Context(env);
-            return ctx.compile(filename, raw).call(new Context(env), thisArg, args);
-        }, micro);
-    }
-
     public Engine() {
     }
 }

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

@@ -1,13 +1,11 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
 import java.util.HashMap;
 
-import me.topchetoeu.jscript.core.scope.GlobalScope;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
-import me.topchetoeu.jscript.utils.interop.NativeWrapperProvider;
 
 @SuppressWarnings("unchecked")
 public class Environment implements Extensions {
@@ -31,9 +29,6 @@ public class Environment implements Extensions {
 
     private HashMap<Key<?>, Object> data = new HashMap<>();
 
-    public GlobalScope global;
-    public WrapperProvider wrappers;
-
     @Override public <T> void add(Key<T> key, T obj) {
         data.put(key, obj);
     }
@@ -56,37 +51,11 @@ public class Environment implements Extensions {
 
     public static FunctionValue regexConstructor(Extensions ext) {
         return ext.init(REGEX_CONSTR, new NativeFunction("RegExp", args -> {
-            throw EngineException.ofError("Regular expressions not supported.").setCtx(args.ctx);
+            throw EngineException.ofError("Regular expressions not supported.").setExtensions(args.ctx);
         }));
     }
 
-    public Environment copy() {
-        var res = new Environment(null, global);
-
-        res.wrappers = wrappers.fork(res);
-        res.global = global;
-        res.data.putAll(data);
-
-        return res;
-    }
-    public Environment child() {
-        var res = copy();
-        res.global = res.global.globalChild();
-        return res;
-    }
-
     public Context context() {
         return new Context(this);
     }
-
-    public Environment(WrapperProvider nativeConverter, GlobalScope global) {
-        if (nativeConverter == null) nativeConverter = new NativeWrapperProvider(this);
-        if (global == null) global = new GlobalScope();
-
-        this.wrappers = nativeConverter;
-        this.global = global;
-    }
-    public Environment() {
-        this(null, null);
-    }
 }

src/java/me/topchetoeu/jscript/runtime/EventLoop.java

@@ -1,8 +1,10 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
+import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.ResultRunnable;
 import me.topchetoeu.jscript.common.events.DataNotifier;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
 
 public interface EventLoop {
     public static final Key<EventLoop> KEY = new Key<>();
@@ -20,4 +22,16 @@ public interface EventLoop {
     public default DataNotifier<Void> pushMsg(Runnable runnable, boolean micro) {
         return pushMsg(() -> { runnable.run(); return null; }, micro);
     }
+
+    public default DataNotifier<Object> pushMsg(boolean micro, Extensions ext, FunctionValue func, Object thisArg, Object ...args) {
+        return pushMsg(() -> {
+            return func.call(Context.of(ext), thisArg, args);
+        }, micro);
+    }
+    public default DataNotifier<Object> pushMsg(boolean micro, Extensions ext, Filename filename, String raw, Object thisArg, Object ...args) {
+        return pushMsg(() -> {
+            var ctx = Context.of(ext);
+            return ctx.compile(filename, raw).call(Context.of(ext), thisArg, args);
+        }, micro);
+    }
 }

src/java/me/topchetoeu/jscript/runtime/Extensions.java

@@ -0,0 +1,77 @@
+package me.topchetoeu.jscript.runtime;
+
+import java.util.List;
+
+public interface Extensions extends Childable, Copyable {
+    public static Extensions EMPTY = new Extensions() {
+        @Override public <T> void add(Key<T> key, T obj) { }
+        @Override public boolean remove(Key<?> key) { return false; }
+
+        @Override public <T> T get(Key<T> key) { return null; }
+        @Override public boolean has(Key<?> key) { return false; }
+        @Override public Iterable<Key<?>> keys() { return List.of(); }
+    };
+
+    <T> T get(Key<T> key);
+    <T> void add(Key<T> key, T obj);
+    Iterable<Key<?>> keys();
+
+    boolean has(Key<?> key);
+    boolean remove(Key<?> key);
+
+    default void add(Key<Void> key) {
+        add(key, null);
+    }
+
+    default boolean hasNotNull(Key<?> key) {
+        return has(key) && get(key) != null;
+    }
+
+    default <T> T get(Key<T> key, T defaultVal) {
+        if (has(key)) return get(key);
+        else return defaultVal;
+    }
+
+    default <T> T init(Key<T> key, T val) {
+        if (has(key)) return get(key);
+        else {
+            add(key, val);
+            return val;
+        }
+    }
+    @SuppressWarnings("unchecked")
+    default void addAll(Extensions source) {
+        if (source == null) return;
+        for (var key : source.keys()) {
+            add((Key<Object>)key, (Object)source.get(key));
+        }
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    default Extensions copy() {
+        var res = new Environment();
+        for (var key : keys()) {
+            var val = get(key);
+            if (val instanceof Copyable) val = ((Copyable)val).copy();
+            res.add((Key<Object>)key, val);
+        }
+        return res;
+    }
+    @Override
+    @SuppressWarnings("unchecked")
+    default Extensions child() {
+        var res = new Environment();
+        for (var key : keys()) {
+            var val = get(key);
+            if (val instanceof Childable) val = ((Childable)val).child();
+            res.add((Key<Object>)key, val);
+        }
+        return res;
+    }
+
+    public static Extensions wrap(Extensions ext) {
+        if (ext == null) return EMPTY;
+        else return ext;
+    }
+}

src/java/me/topchetoeu/jscript/runtime/Frame.java

@@ -1,19 +1,19 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
 import java.util.List;
 import java.util.Stack;
 
 import me.topchetoeu.jscript.common.Instruction;
-import me.topchetoeu.jscript.core.debug.DebugContext;
+import me.topchetoeu.jscript.runtime.debug.DebugContext;
-import me.topchetoeu.jscript.core.scope.LocalScope;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.scope.LocalScope;
-import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.scope.ValueVariable;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.ScopeValue;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ScopeValue;
-import me.topchetoeu.jscript.core.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 public class Frame {
     public static enum TryState {
@@ -294,13 +294,13 @@ public class Frame {
     public ObjectValue getValStackScope() {
         return new ObjectValue() {
             @Override
-            protected Object getField(Context ctx, Object key) {
+            protected Object getField(Extensions ext, Object key) {
-                var i = (int)Values.toNumber(ctx, key);
+                var i = (int)Values.toNumber(ext, key);
                 if (i < 0 || i >= stackPtr) return null;
                 else return stack[i];
             }
             @Override
-            protected boolean hasField(Context ctx, Object key) {
+            protected boolean hasField(Extensions ext, Object key) {
                 return true;
             }
             @Override

src/java/me/topchetoeu/jscript/runtime/InstructionRunner.java

@@ -1,56 +1,57 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
 import java.util.Collections;
 
-import me.topchetoeu.jscript.core.scope.ValueVariable;
-import me.topchetoeu.jscript.core.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.CodeFunction;
-import me.topchetoeu.jscript.core.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.Symbol;
-import me.topchetoeu.jscript.core.values.Values;
 import me.topchetoeu.jscript.common.Instruction;
 import me.topchetoeu.jscript.common.Operation;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.scope.GlobalScope;
+import me.topchetoeu.jscript.runtime.scope.ValueVariable;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 public class InstructionRunner {
-    private static Object execReturn(Context ctx, Instruction instr, Frame frame) {
+    private static Object execReturn(Extensions ext, Instruction instr, Frame frame) {
         return frame.pop();
     }
-    private static Object execThrow(Context ctx, Instruction instr, Frame frame) {
+    private static Object execThrow(Extensions ext, Instruction instr, Frame frame) {
         throw new EngineException(frame.pop());
     }
-    private static Object execThrowSyntax(Context ctx, Instruction instr, Frame frame) {
+    private static Object execThrowSyntax(Extensions ext, Instruction instr, Frame frame) {
         throw EngineException.ofSyntax((String)instr.get(0));
     }
 
-    private static Object execCall(Context ctx, Instruction instr, Frame frame) {
+    private static Object execCall(Extensions ext, Instruction instr, Frame frame) {
         var callArgs = frame.take(instr.get(0));
         var func = frame.pop();
         var thisArg = frame.pop();
 
-        frame.push(Values.call(ctx, func, thisArg, callArgs));
+        frame.push(Values.call(ext, func, thisArg, callArgs));
 
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execCallNew(Context ctx, Instruction instr, Frame frame) {
+    private static Object execCallNew(Extensions ext, Instruction instr, Frame frame) {
         var callArgs = frame.take(instr.get(0));
         var funcObj = frame.pop();
 
-        frame.push(Values.callNew(ctx, funcObj, callArgs));
+        frame.push(Values.callNew(ext, funcObj, callArgs));
 
         frame.codePtr++;
         return Values.NO_RETURN;
     }
 
-    private static Object execMakeVar(Context ctx, Instruction instr, Frame frame) {
+    private static Object execMakeVar(Extensions ext, Instruction instr, Frame frame) {
         var name = (String)instr.get(0);
-        ctx.environment.global.define(name);
+        GlobalScope.get(ext).define(ext, name);
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execDefProp(Context ctx, Instruction instr, Frame frame) {
+    private static Object execDefProp(Extensions ext, Instruction instr, Frame frame) {
         var setter = frame.pop();
         var getter = frame.pop();
         var name = frame.pop();
@@ -59,16 +60,16 @@ public class InstructionRunner {
         if (getter != null && !(getter instanceof FunctionValue)) throw EngineException.ofType("Getter must be a function or undefined.");
         if (setter != null && !(setter instanceof FunctionValue)) throw EngineException.ofType("Setter must be a function or undefined.");
         if (!(obj instanceof ObjectValue)) throw EngineException.ofType("Property apply target must be an object.");
-        ((ObjectValue)obj).defineProperty(ctx, name, (FunctionValue)getter, (FunctionValue)setter, false, false);
+        ((ObjectValue)obj).defineProperty(ext, name, (FunctionValue)getter, (FunctionValue)setter, false, false);
 
         frame.push(obj);
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execKeys(Context ctx, Instruction instr, Frame frame) {
+    private static Object execKeys(Extensions ext, Instruction instr, Frame frame) {
         var val = frame.pop();
 
-        var members = Values.getMembers(ctx, val, false, false);
+        var members = Values.getMembers(ext, val, false, false);
         Collections.reverse(members);
 
         frame.push(null);
@@ -76,7 +77,7 @@ public class InstructionRunner {
         for (var el : members) {
             if (el instanceof Symbol) continue;
             var obj = new ObjectValue();
-            obj.defineProperty(ctx, "value", el);
+            obj.defineProperty(ext, "value", el);
             frame.push(obj);
         }
 
@@ -84,7 +85,7 @@ public class InstructionRunner {
         return Values.NO_RETURN;
     }
 
-    private static Object execTryStart(Context ctx, Instruction instr, Frame frame) {
+    private static Object execTryStart(Extensions ext, Instruction instr, Frame frame) {
         int start = frame.codePtr + 1;
         int catchStart = (int)instr.get(0);
         int finallyStart = (int)instr.get(1);
@@ -95,12 +96,12 @@ public class InstructionRunner {
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execTryEnd(Context ctx, Instruction instr, Frame frame) {
+    private static Object execTryEnd(Extensions ext, Instruction instr, Frame frame) {
         frame.popTryFlag = true;
         return Values.NO_RETURN;
     }
 
-    private static Object execDup(Context ctx, Instruction instr, Frame frame) {
+    private static Object execDup(Extensions ext, Instruction instr, Frame frame) {
         int count = instr.get(0);
 
         for (var i = 0; i < count; i++) {
@@ -110,7 +111,7 @@ public class InstructionRunner {
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadValue(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadValue(Extensions ext, Instruction instr, Frame frame) {
         switch (instr.type) {
             case PUSH_UNDEFINED: frame.push(null); break;
             case PUSH_NULL: frame.push(Values.NULL); break;
@@ -120,33 +121,33 @@ public class InstructionRunner {
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadVar(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadVar(Extensions ext, Instruction instr, Frame frame) {
         var i = instr.get(0);
 
-        if (i instanceof String) frame.push(ctx.environment.global.get(ctx, (String)i));
+        if (i instanceof String) frame.push(GlobalScope.get(ext).get(ext, (String)i));
-        else frame.push(frame.scope.get((int)i).get(ctx));
+        else frame.push(frame.scope.get((int)i).get(ext));
 
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadObj(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadObj(Extensions ext, Instruction instr, Frame frame) {
         frame.push(new ObjectValue());
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadGlob(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadGlob(Extensions ext, Instruction instr, Frame frame) {
-        frame.push(ctx.environment.global.obj);
+        frame.push(GlobalScope.get(ext).obj);
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadArr(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadArr(Extensions ext, Instruction instr, Frame frame) {
         var res = new ArrayValue();
         res.setSize(instr.get(0));
         frame.push(res);
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadFunc(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadFunc(Extensions ext, Instruction instr, Frame frame) {
         int id = instr.get(0);
         var captures = new ValueVariable[instr.params.length - 1];
 
@@ -154,19 +155,19 @@ public class InstructionRunner {
             captures[i - 1] = frame.scope.get(instr.get(i));
         }
 
-        var func = new CodeFunction(ctx.environment, "", frame.function.body.children[id], captures);
+        var func = new CodeFunction(ext, "", frame.function.body.children[id], captures);
 
         frame.push(func);
 
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadMember(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadMember(Extensions ext, Instruction instr, Frame frame) {
         var key = frame.pop();
         var obj = frame.pop();
 
         try {
-            frame.push(Values.getMember(ctx, obj, key));
+            frame.push(Values.getMember(ext, obj, key));
         }
         catch (IllegalArgumentException e) {
             throw EngineException.ofType(e.getMessage());
@@ -174,9 +175,9 @@ public class InstructionRunner {
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execLoadRegEx(Context ctx, Instruction instr, Frame frame) {
+    private static Object execLoadRegEx(Extensions ext, Instruction instr, Frame frame) {
-        if (ctx.hasNotNull(Environment.REGEX_CONSTR)) {
+        if (ext.hasNotNull(Environment.REGEX_CONSTR)) {
-            frame.push(Values.callNew(ctx, ctx.get(Environment.REGEX_CONSTR), instr.get(0), instr.get(1)));
+            frame.push(Values.callNew(ext, ext.get(Environment.REGEX_CONSTR), instr.get(0), instr.get(1)));
         }
         else {
             throw EngineException.ofSyntax("Regex is not supported.");
@@ -185,43 +186,43 @@ public class InstructionRunner {
         return Values.NO_RETURN;
     }
 
-    private static Object execDiscard(Context ctx, Instruction instr, Frame frame) {
+    private static Object execDiscard(Extensions ext, Instruction instr, Frame frame) {
         frame.pop();
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execStoreMember(Context ctx, Instruction instr, Frame frame) {
+    private static Object execStoreMember(Extensions ext, Instruction instr, Frame frame) {
         var val = frame.pop();
         var key = frame.pop();
         var obj = frame.pop();
 
-        if (!Values.setMember(ctx, obj, key, val)) throw EngineException.ofSyntax("Can't set member '" + key + "'.");
+        if (!Values.setMember(ext, obj, key, val)) throw EngineException.ofSyntax("Can't set member '" + key + "'.");
         if ((boolean)instr.get(0)) frame.push(val);
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execStoreVar(Context ctx, Instruction instr, Frame frame) {
+    private static Object execStoreVar(Extensions ext, Instruction instr, Frame frame) {
         var val = (boolean)instr.get(1) ? frame.peek() : frame.pop();
         var i = instr.get(0);
 
-        if (i instanceof String) ctx.environment.global.set(ctx, (String)i, val);
+        if (i instanceof String) GlobalScope.get(ext).set(ext, (String)i, val);
-        else frame.scope.get((int)i).set(ctx, val);
+        else frame.scope.get((int)i).set(ext, val);
 
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execStoreSelfFunc(Context ctx, Instruction instr, Frame frame) {
+    private static Object execStoreSelfFunc(Extensions ext, Instruction instr, Frame frame) {
-        frame.scope.locals[(int)instr.get(0)].set(ctx, frame.function);
+        frame.scope.locals[(int)instr.get(0)].set(ext, frame.function);
         frame.codePtr++;
         return Values.NO_RETURN;
     }
     
-    private static Object execJmp(Context ctx, Instruction instr, Frame frame) {
+    private static Object execJmp(Extensions ext, Instruction instr, Frame frame) {
         frame.codePtr += (int)instr.get(0);
         frame.jumpFlag = true;
         return Values.NO_RETURN;
     }
-    private static Object execJmpIf(Context ctx, Instruction instr, Frame frame) {
+    private static Object execJmpIf(Extensions ext, Instruction instr, Frame frame) {
         if (Values.toBoolean(frame.pop())) {
             frame.codePtr += (int)instr.get(0);
             frame.jumpFlag = true;
@@ -229,7 +230,7 @@ public class InstructionRunner {
         else frame.codePtr ++;
         return Values.NO_RETURN;
     }
-    private static Object execJmpIfNot(Context ctx, Instruction instr, Frame frame) {
+    private static Object execJmpIfNot(Extensions ext, Instruction instr, Frame frame) {
         if (Values.not(frame.pop())) {
             frame.codePtr += (int)instr.get(0);
             frame.jumpFlag = true;
@@ -238,13 +239,13 @@ public class InstructionRunner {
         return Values.NO_RETURN;
     }
 
-    private static Object execTypeof(Context ctx, Instruction instr, Frame frame) {
+    private static Object execTypeof(Extensions ext, Instruction instr, Frame frame) {
         String name = instr.get(0);
         Object obj;
 
         if (name != null) {
-            if (ctx.environment.global.has(ctx, name)) {
+            if (GlobalScope.get(ext).has(ext, name)) {
-                obj = ctx.environment.global.get(ctx, name);
+                obj = GlobalScope.get(ext).get(ext, name);
             }
             else obj = null;
         }
@@ -255,73 +256,73 @@ public class InstructionRunner {
         frame.codePtr++;
         return Values.NO_RETURN;
     }
-    private static Object execNop(Context ctx, Instruction instr, Frame frame) {
+    private static Object execNop(Extensions ext, Instruction instr, Frame frame) {
         frame.codePtr++;
         return Values.NO_RETURN;
     }
 
-    private static Object execDelete(Context ctx, Instruction instr, Frame frame) {
+    private static Object execDelete(Extensions ext, Instruction instr, Frame frame) {
         var key = frame.pop();
         var val = frame.pop();
 
-        if (!Values.deleteMember(ctx, val, key)) throw EngineException.ofSyntax("Can't delete member '" + key + "'.");
+        if (!Values.deleteMember(ext, val, key)) throw EngineException.ofSyntax("Can't delete member '" + key + "'.");
         frame.codePtr++;
         return Values.NO_RETURN;
     }
 
-    private static Object execOperation(Context ctx, Instruction instr, Frame frame) {
+    private static Object execOperation(Extensions ext, Instruction instr, Frame frame) {
         Operation op = instr.get(0);
         var args = new Object[op.operands];
 
         for (var i = op.operands - 1; i >= 0; i--) args[i] = frame.pop();
 
-        frame.push(Values.operation(ctx, op, args));
+        frame.push(Values.operation(ext, op, args));
         frame.codePtr++;
         return Values.NO_RETURN;
     }
 
-    public static Object exec(Context ctx, Instruction instr, Frame frame) {
+    public static Object exec(Extensions ext, Instruction instr, Frame frame) {
         switch (instr.type) {
-            case NOP: return execNop(ctx, instr, frame);
+            case NOP: return execNop(ext, instr, frame);
-            case RETURN: return execReturn(ctx, instr, frame);
+            case RETURN: return execReturn(ext, instr, frame);
-            case THROW: return execThrow(ctx, instr, frame);
+            case THROW: return execThrow(ext, instr, frame);
-            case THROW_SYNTAX: return execThrowSyntax(ctx, instr, frame);
+            case THROW_SYNTAX: return execThrowSyntax(ext, instr, frame);
-            case CALL: return execCall(ctx, instr, frame);
+            case CALL: return execCall(ext, instr, frame);
-            case CALL_NEW: return execCallNew(ctx, instr, frame);
+            case CALL_NEW: return execCallNew(ext, instr, frame);
-            case TRY_START: return execTryStart(ctx, instr, frame);
+            case TRY_START: return execTryStart(ext, instr, frame);
-            case TRY_END: return execTryEnd(ctx, instr, frame);
+            case TRY_END: return execTryEnd(ext, instr, frame);
 
-            case DUP: return execDup(ctx, instr, frame);
+            case DUP: return execDup(ext, instr, frame);
             case PUSH_UNDEFINED:
             case PUSH_NULL:
             case PUSH_STRING:
             case PUSH_NUMBER:
             case PUSH_BOOL:
-                return execLoadValue(ctx, instr, frame);
+                return execLoadValue(ext, instr, frame);
-            case LOAD_VAR: return execLoadVar(ctx, instr, frame);
+            case LOAD_VAR: return execLoadVar(ext, instr, frame);
-            case LOAD_OBJ: return execLoadObj(ctx, instr, frame);
+            case LOAD_OBJ: return execLoadObj(ext, instr, frame);
-            case LOAD_ARR: return execLoadArr(ctx, instr, frame);
+            case LOAD_ARR: return execLoadArr(ext, instr, frame);
-            case LOAD_FUNC: return execLoadFunc(ctx, instr, frame);
+            case LOAD_FUNC: return execLoadFunc(ext, instr, frame);
-            case LOAD_MEMBER: return execLoadMember(ctx, instr, frame);
+            case LOAD_MEMBER: return execLoadMember(ext, instr, frame);
-            case LOAD_REGEX: return execLoadRegEx(ctx, instr, frame);
+            case LOAD_REGEX: return execLoadRegEx(ext, instr, frame);
-            case LOAD_GLOB: return execLoadGlob(ctx, instr, frame);
+            case LOAD_GLOB: return execLoadGlob(ext, instr, frame);
 
-            case DISCARD: return execDiscard(ctx, instr, frame);
+            case DISCARD: return execDiscard(ext, instr, frame);
-            case STORE_MEMBER: return execStoreMember(ctx, instr, frame);
+            case STORE_MEMBER: return execStoreMember(ext, instr, frame);
-            case STORE_VAR: return execStoreVar(ctx, instr, frame);
+            case STORE_VAR: return execStoreVar(ext, instr, frame);
-            case STORE_SELF_FUNC: return execStoreSelfFunc(ctx, instr, frame);
+            case STORE_SELF_FUNC: return execStoreSelfFunc(ext, instr, frame);
-            case MAKE_VAR: return execMakeVar(ctx, instr, frame);
+            case MAKE_VAR: return execMakeVar(ext, instr, frame);
 
-            case KEYS: return execKeys(ctx, instr, frame);
+            case KEYS: return execKeys(ext, instr, frame);
-            case DEF_PROP: return execDefProp(ctx, instr, frame);
+            case DEF_PROP: return execDefProp(ext, instr, frame);
-            case TYPEOF: return execTypeof(ctx, instr, frame);
+            case TYPEOF: return execTypeof(ext, instr, frame);
-            case DELETE: return execDelete(ctx, instr, frame);
+            case DELETE: return execDelete(ext, instr, frame);
 
-            case JMP: return execJmp(ctx, instr, frame);
+            case JMP: return execJmp(ext, instr, frame);
-            case JMP_IF: return execJmpIf(ctx, instr, frame);
+            case JMP_IF: return execJmpIf(ext, instr, frame);
-            case JMP_IFN: return execJmpIfNot(ctx, instr, frame);
+            case JMP_IFN: return execJmpIfNot(ext, instr, frame);
 
-            case OPERATION: return execOperation(ctx, instr, frame);
+            case OPERATION: return execOperation(ext, instr, frame);
 
             default: throw EngineException.ofSyntax("Invalid instruction " + instr.type.name() + ".");
         }

src/java/me/topchetoeu/jscript/runtime/Key.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.runtime;
+
+public class Key<T> {
+    
+}

src/java/me/topchetoeu/jscript/runtime/WrapperProvider.java

@@ -1,7 +1,7 @@
-package me.topchetoeu.jscript.core;
+package me.topchetoeu.jscript.runtime;
 
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
 
 public interface WrapperProvider {
     public ObjectValue getProto(Class<?> obj);

src/java/me/topchetoeu/jscript/runtime/debug/DebugContext.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.debug;
+package me.topchetoeu.jscript.runtime.debug;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -10,13 +10,13 @@ import me.topchetoeu.jscript.common.FunctionBody;
 import me.topchetoeu.jscript.common.Instruction;
 import me.topchetoeu.jscript.common.Location;
 import me.topchetoeu.jscript.common.mapping.FunctionMap;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Extensions;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.Key;
+import me.topchetoeu.jscript.runtime.Key;
-import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.CodeFunction;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
 
 public class DebugContext {
     public static final Key<DebugContext> KEY = new Key<>();
@@ -32,10 +32,17 @@ public class DebugContext {
         if (sources != null) {
             for (var source : sources.entrySet()) debugger.onSourceLoad(source.getKey(), source.getValue());
         }
+        if (maps != null) {
+            for (var map : maps.entrySet()) debugger.onFunctionLoad(map.getKey(), map.getValue());
+        }
 
         this.debugger = debugger;
         return true;
     }
+    public boolean detachDebugger(DebugHandler debugger) {
+        if (this.debugger != debugger) return false;
+        return detachDebugger();
+    }
     public boolean detachDebugger() {
         this.debugger = null;
         return true;

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

@@ -1,12 +1,12 @@
-package me.topchetoeu.jscript.core.debug;
+package me.topchetoeu.jscript.runtime.debug;
 
 import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.FunctionBody;
 import me.topchetoeu.jscript.common.Instruction;
 import me.topchetoeu.jscript.common.mapping.FunctionMap;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
 
 public interface DebugHandler {
     /**

src/java/me/topchetoeu/jscript/runtime/exceptions/ConvertException.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.exceptions;
+package me.topchetoeu.jscript.runtime.exceptions;
 
 public class ConvertException extends RuntimeException {
     public final String source, target;

src/java/me/topchetoeu/jscript/runtime/exceptions/EngineException.java

@@ -1,23 +1,24 @@
-package me.topchetoeu.jscript.core.exceptions;
+package me.topchetoeu.jscript.runtime.exceptions;
 
 import java.util.ArrayList;
 import java.util.List;
 
 import me.topchetoeu.jscript.common.Location;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Environment;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.values.ObjectValue.PlaceholderProto;
+import me.topchetoeu.jscript.runtime.values.Values;
+import me.topchetoeu.jscript.runtime.values.ObjectValue.PlaceholderProto;
 
 public class EngineException extends RuntimeException {
     public static class StackElement {
         public final Location location;
         public final String name;
-        public final Context ctx;
+        public final Extensions ext;
 
         public boolean visible() {
-            return ctx == null || !ctx.get(Environment.HIDE_STACK, false);
+            return ext == null || !ext.get(Environment.HIDE_STACK, false);
         }
         public String toString() {
             var res = "";
@@ -29,12 +30,13 @@ public class EngineException extends RuntimeException {
             return res.trim();
         }
 
-        public StackElement(Context ctx, Location location, String name) {
+        public StackElement(Extensions ext, Location location, String name) {
             if (name != null) name = name.trim();
             if (name.equals("")) name = null;
 
-            if (ctx == null) this.ctx = null;
+            if (ext == null) this.ext = null;
-            else this.ctx = new Context(ctx.environment);
+            else this.ext = Context.clean(ext);
+
             this.location = location;
             this.name = name;
         }
@@ -42,13 +44,13 @@ public class EngineException extends RuntimeException {
 
     public final Object value;
     public EngineException cause;
-    public Environment env = null;
+    public Extensions ext = null;
     public final List<StackElement> stackTrace = new ArrayList<>();
 
-    public EngineException add(Context ctx, String name, Location location) {
+    public EngineException add(Extensions ext, String name, Location location) {
-        var el = new StackElement(ctx, location, name);
+        var el = new StackElement(ext, location, name);
         if (el.name == null && el.location == null) return this;
-        setCtx(ctx);
+        setExtensions(ext);
         stackTrace.add(el);
         return this;
     }
@@ -56,15 +58,15 @@ public class EngineException extends RuntimeException {
         this.cause = cause;
         return this;
     }
-    public EngineException setCtx(Context ctx) {
+    public EngineException setExtensions(Extensions ext) {
-        if (this.env == null) this.env = ctx.environment;
+        if (this.ext == null) this.ext = Context.clean(ext);
         return this;
     }
 
-    public String toString(Context ctx) {
+    public String toString(Extensions ext) {
         var ss = new StringBuilder();
         try {
-            ss.append(Values.toString(ctx, value)).append('\n');
+            ss.append(Values.toString(ext, value)).append('\n');
         }
         catch (EngineException e) {
             ss.append("[Error while stringifying]\n");
@@ -72,7 +74,7 @@ public class EngineException extends RuntimeException {
         for (var line : stackTrace) {
             if (line.visible()) ss.append("    ").append(line.toString()).append("\n");
         }
-        if (cause != null) ss.append("Caused by ").append(cause.toString(ctx)).append('\n');
+        if (cause != null) ss.append("Caused by ").append(cause.toString(ext)).append('\n');
         ss.deleteCharAt(ss.length() - 1);
         return ss.toString();
     }

src/java/me/topchetoeu/jscript/runtime/exceptions/InterruptException.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.exceptions;
+package me.topchetoeu.jscript.runtime.exceptions;
 
 public class InterruptException extends RuntimeException {
     public InterruptException() { }

src/java/me/topchetoeu/jscript/runtime/exceptions/SyntaxException.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.exceptions;
+package me.topchetoeu.jscript.runtime.exceptions;
 
 import me.topchetoeu.jscript.common.Location;
 

src/java/me/topchetoeu/jscript/runtime/scope/GlobalScope.java

@@ -0,0 +1,81 @@
+package me.topchetoeu.jscript.runtime.scope;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import me.topchetoeu.jscript.runtime.Extensions;
+import me.topchetoeu.jscript.runtime.Key;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Values;
+
+public class GlobalScope {
+    public static final Key<GlobalScope> KEY = new Key<>();
+
+    public final ObjectValue obj;
+
+    public boolean has(Extensions ext, String name) {
+        return Values.hasMember(ext, obj, name, false);
+    }
+
+    public GlobalScope globalChild() {
+        var obj = new ObjectValue();
+        Values.setPrototype(null, obj, this.obj);
+        return new GlobalScope(obj);
+    }
+
+    public Object define(Extensions ext, String name) {
+        if (Values.hasMember(ext, obj, name, false)) return name;
+        obj.defineProperty(ext, name, null);
+        return name;
+    }
+    public void define(Extensions ext, String name, Variable val) {
+        obj.defineProperty(ext, name,
+            new NativeFunction("get " + name, args -> val.get(args.ctx)),
+            new NativeFunction("set " + name, args -> { val.set(args.ctx, args.get(0)); return null; }),
+            true, true
+        );
+    }
+    public void define(Extensions ext, String name, boolean readonly, Object val) {
+        obj.defineProperty(ext, name, val, readonly, true, true);
+    }
+    public void define(Extensions ext, String ...names) {
+        for (var n : names) define(ext, n);
+    }
+    public void define(Extensions ext, boolean readonly, FunctionValue val) {
+        define(ext, val.name, readonly, val);
+    }
+
+    public Object get(Extensions ext, String name) {
+        if (!Values.hasMember(ext, obj, name, false)) throw EngineException.ofSyntax("The variable '" + name + "' doesn't exist.");
+        else return Values.getMember(ext, obj, name);
+    }
+    public void set(Extensions ext, String name, Object val) {
+        if (!Values.hasMember(ext, obj, name, false)) throw EngineException.ofSyntax("The variable '" + name + "' doesn't exist.");
+        if (!Values.setMember(ext, obj, name, val)) throw EngineException.ofSyntax("The global '" + name + "' is readonly.");
+    }
+
+    public Set<String> keys() {
+        var res = new HashSet<String>();
+
+        for (var key : keys()) {
+            if (key instanceof String) res.add((String)key);
+        }
+
+        return res;
+    }
+
+    public GlobalScope() {
+        this.obj = new ObjectValue();
+    }
+    public GlobalScope(ObjectValue val) {
+        this.obj = val;
+    }
+
+    public static GlobalScope get(Extensions ext) {
+        if (ext.has(KEY)) return ext.get(KEY);
+        else return new GlobalScope();
+    }
+}

src/java/me/topchetoeu/jscript/runtime/scope/LocalScope.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.scope;
+package me.topchetoeu.jscript.runtime.scope;
 
 import java.util.ArrayList;
 

src/java/me/topchetoeu/jscript/runtime/scope/ValueVariable.java

@@ -1,7 +1,7 @@
-package me.topchetoeu.jscript.core.scope;
+package me.topchetoeu.jscript.runtime.scope;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 public class ValueVariable implements Variable {
     public boolean readonly;
@@ -11,14 +11,14 @@ public class ValueVariable implements Variable {
     public boolean readonly() { return readonly; }
 
     @Override
-    public Object get(Context ctx) {
+    public Object get(Extensions ext) {
         return value;
     }
 
     @Override
-    public void set(Context ctx, Object val) {
+    public void set(Extensions ext, Object val) {
         if (readonly) return;
-        this.value = Values.normalize(ctx, val);
+        this.value = Values.normalize(ext, val);
     }
     
     public ValueVariable(boolean readonly, Object val) {

src/java/me/topchetoeu/jscript/runtime/scope/Variable.java

@@ -0,0 +1,9 @@
+package me.topchetoeu.jscript.runtime.scope;
+
+import me.topchetoeu.jscript.runtime.Extensions;
+
+public interface Variable {
+    Object get(Extensions ext);
+    default boolean readonly() { return true; }
+    default void set(Extensions ext, Object val) { }
+}

src/java/me/topchetoeu/jscript/runtime/values/ArrayValue.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import java.util.Arrays;
 import java.util.Collection;
@@ -6,7 +6,7 @@ import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
 
 // TODO: Make methods generic
 public class ArrayValue extends ObjectValue implements Iterable<Object> {
@@ -41,12 +41,12 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         if (res == UNDEFINED) return null;
         else return res;
     }
-    public void set(Context ctx, int i, Object val) {
+    public void set(Extensions ext, int i, Object val) {
         if (i < 0) return;
 
         values = alloc(i);
 
-        val = Values.normalize(ctx, val);
+        val = Values.normalize(ext, val);
         if (val == null) val = UNDEFINED;
         values[i] = val;
         if (i >= size) size = i + 1;
@@ -99,9 +99,9 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         }
     }
 
-    public void copyFrom(Context ctx, Object[] arr, int sourceStart, int destStart, int count) {
+    public void copyFrom(Extensions ext, Object[] arr, int sourceStart, int destStart, int count) {
         for (var i = 0; i < count; i++) {
-            set(ctx, i + destStart, arr[i + sourceStart]);
+            set(ext, i + destStart, arr[i + sourceStart]);
         }
     }
 
@@ -131,7 +131,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
     }
 
     @Override
-    protected Object getField(Context ctx, Object key) {
+    protected Object getField(Extensions ext, Object key) {
         if (key instanceof Number) {
             var i = ((Number)key).doubleValue();
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -139,22 +139,22 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
             }
         }
 
-        return super.getField(ctx, key);
+        return super.getField(ext, key);
     }
     @Override
-    protected boolean setField(Context ctx, Object key, Object val) {
+    protected boolean setField(Extensions ext, Object key, Object val) {
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
-                set(ctx, (int)i, val);
+                set(ext, (int)i, val);
                 return true;
             }
         }
 
-        return super.setField(ctx, key, val);
+        return super.setField(ext, key, val);
     }
     @Override
-    protected boolean hasField(Context ctx, Object key) {
+    protected boolean hasField(Extensions ext, Object key) {
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -162,10 +162,10 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
             }
         }
 
-        return super.hasField(ctx, key);
+        return super.hasField(ext, key);
     }
     @Override
-    protected void deleteField(Context ctx, Object key) {
+    protected void deleteField(Extensions ext, Object key) {
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -174,7 +174,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
             }
         }
 
-        super.deleteField(ctx, key);
+        super.deleteField(ext, key);
     }
 
     @Override
@@ -213,15 +213,15 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         values = new Object[cap];
         size = 0;
     }
-    public ArrayValue(Context ctx, Object ...values) {
+    public ArrayValue(Extensions ext, Object ...values) {
         this();
         this.values = new Object[values.length];
         size = values.length;
 
-        for (var i = 0; i < size; i++) this.values[i] = Values.normalize(ctx, values[i]);
+        for (var i = 0; i < size; i++) this.values[i] = Values.normalize(ext, values[i]);
     }
 
-    public static ArrayValue of(Context ctx, Collection<?> values) {
+    public static ArrayValue of(Extensions ext, Collection<?> values) {
-        return new ArrayValue(ctx, values.toArray(Object[]::new));
+        return new ArrayValue(ext, values.toArray(Object[]::new));
     }
 }

src/java/me/topchetoeu/jscript/runtime/values/CodeFunction.java

@@ -1,15 +1,15 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import me.topchetoeu.jscript.common.FunctionBody;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.runtime.scope.ValueVariable;
 
 public class CodeFunction extends FunctionValue {
     public final FunctionBody body;
     public final ValueVariable[] captures;
-    public Environment environment;
+    public Extensions extensions;
 
     // public Location loc() {
     //     for (var instr : body.instructions) {
@@ -25,8 +25,8 @@ public class CodeFunction extends FunctionValue {
     // }
 
     @Override
-    public Object call(Context ctx, Object thisArg, Object ...args) {
+    public Object call(Extensions ext, Object thisArg, Object ...args) {
-        var frame = new Frame(ctx, thisArg, args, this);
+        var frame = new Frame(Context.of(ext), thisArg, args, this);
 
         frame.onPush();
 
@@ -41,10 +41,10 @@ public class CodeFunction extends FunctionValue {
         }
     }
 
-    public CodeFunction(Environment environment, String name, FunctionBody body, ValueVariable[] captures) {
+    public CodeFunction(Extensions extensions, String name, FunctionBody body, ValueVariable[] captures) {
         super(name, body.argsN);
         this.captures = captures;
-        this.environment = environment;
+        this.extensions = Context.clean(extensions);
         this.body = body;
     }
 }

src/java/me/topchetoeu/jscript/runtime/values/ConvertHint.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 public enum ConvertHint {
     TOSTRING,

src/java/me/topchetoeu/jscript/runtime/values/FunctionValue.java

@@ -1,8 +1,8 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import java.util.List;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
 
 public abstract class FunctionValue extends ObjectValue {
     public String name = "";
@@ -13,29 +13,29 @@ public abstract class FunctionValue extends ObjectValue {
         return String.format("function %s(...)", name);
     }
 
-    public abstract Object call(Context ctx, Object thisArg, Object ...args);
+    public abstract Object call(Extensions ext, Object thisArg, Object ...args);
-    public Object call(Context ctx) {
+    public Object call(Extensions ext) {
-        return call(ctx, null);
+        return call(ext, null);
     }
 
     @Override
-    protected Object getField(Context ctx, Object key) {
+    protected Object getField(Extensions ext, Object key) {
         if ("name".equals(key)) return name;
         if ("length".equals(key)) return length;
-        return super.getField(ctx, key);
+        return super.getField(ext, key);
     }
     @Override
-    protected boolean setField(Context ctx, Object key, Object val) {
+    protected boolean setField(Extensions ext, Object key, Object val) {
-        if ("name".equals(key)) name = Values.toString(ctx, val);
+        if ("name".equals(key)) name = Values.toString(ext, val);
-        else if ("length".equals(key)) length = (int)Values.toNumber(ctx, val);
+        else if ("length".equals(key)) length = (int)Values.toNumber(ext, val);
-        else return super.setField(ctx, key, val);
+        else return super.setField(ext, key, val);
         return true;
     }
     @Override
-    protected boolean hasField(Context ctx, Object key) {
+    protected boolean hasField(Extensions ext, Object key) {
         if ("name".equals(key)) return true;
         if ("length".equals(key)) return true;
-        return super.hasField(ctx, key);
+        return super.hasField(ext, key);
     }
 
     @Override

src/java/me/topchetoeu/jscript/runtime/values/NativeFunction.java

@@ -1,6 +1,7 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
 import me.topchetoeu.jscript.utils.interop.Arguments;
 
 public class NativeFunction extends FunctionValue {
@@ -11,8 +12,8 @@ public class NativeFunction extends FunctionValue {
     public final NativeFunctionRunner action;
 
     @Override
-    public Object call(Context ctx, Object thisArg, Object ...args) {
+    public Object call(Extensions ext, Object thisArg, Object ...args) {
-        return action.run(new Arguments(ctx, thisArg, args));
+        return action.run(new Arguments(Context.of(ext), thisArg, args));
     }
 
     public NativeFunction(String name, NativeFunctionRunner action) {

src/java/me/topchetoeu/jscript/runtime/values/NativeWrapper.java

@@ -0,0 +1,58 @@
+package me.topchetoeu.jscript.runtime.values;
+
+import java.util.WeakHashMap;
+
+import me.topchetoeu.jscript.runtime.Extensions;
+import me.topchetoeu.jscript.runtime.Key;
+import me.topchetoeu.jscript.utils.interop.NativeWrapperProvider;
+
+public class NativeWrapper extends ObjectValue {
+    private static final Key<WeakHashMap<Object, NativeWrapper>> WRAPPERS = new Key<>();
+    private static final Object NATIVE_PROTO = new Object();
+    public final Object wrapped;
+
+    @Override
+    public ObjectValue getPrototype(Extensions ext) {
+        if (ext != null && prototype == NATIVE_PROTO) {
+            var clazz = wrapped.getClass();
+            var res = NativeWrapperProvider.get(ext).getProto(clazz);
+            if (res != null) return res;
+        }
+        return super.getPrototype(ext);
+    }
+
+    @Override
+    public String toString() {
+        return wrapped.toString();
+    }
+    @Override
+    public boolean equals(Object obj) {
+        return wrapped.equals(obj);
+    }
+    @Override
+    public int hashCode() {
+        return wrapped.hashCode();
+    }
+
+    private NativeWrapper(Object wrapped) {
+        this.wrapped = wrapped;
+        prototype = NATIVE_PROTO;
+    }
+
+    public static NativeWrapper of(Extensions exts, Object wrapped) {
+        if (exts == null) return new NativeWrapper(wrapped);
+        var wrappers = exts.get(WRAPPERS);
+
+        if (wrappers == null) {
+            wrappers = new WeakHashMap<>();
+            exts.add(WRAPPERS, wrappers);
+        }
+
+        if (wrappers.containsKey(wrapped)) return wrappers.get(wrapped);
+
+        var res = new NativeWrapper(wrapped);
+        wrappers.put(wrapped, res);
+
+        return res;
+    }
+}

src/java/me/topchetoeu/jscript/runtime/values/ObjectValue.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
@@ -6,8 +6,8 @@ import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Environment;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Extensions;
 
 public class ObjectValue {
     public static enum PlaceholderProto {
@@ -54,10 +54,10 @@ public class ObjectValue {
     public LinkedHashSet<Object> nonConfigurableSet = new LinkedHashSet<>();
     public LinkedHashSet<Object> nonEnumerableSet = new LinkedHashSet<>();
 
-    private Property getProperty(Context ctx, Object key) {
+    private Property getProperty(Extensions ext, Object key) {
         if (properties.containsKey(key)) return properties.get(key);
-        var proto = getPrototype(ctx);
+        var proto = getPrototype(ext);
-        if (proto != null) return proto.getProperty(ctx, key);
+        if (proto != null) return proto.getProperty(ext, key);
         else return null;
     }
 
@@ -86,8 +86,8 @@ public class ObjectValue {
         state = State.FROZEN;
     }
 
-    public final boolean defineProperty(Context ctx, Object key, Object val, boolean writable, boolean configurable, boolean enumerable) {
+    public final boolean defineProperty(Extensions ext, Object key, Object val, boolean writable, boolean configurable, boolean enumerable) {
-        key = Values.normalize(ctx, key); val = Values.normalize(ctx, val);
+        key = Values.normalize(ext, key); val = Values.normalize(ext, val);
         boolean reconfigured = 
             writable != memberWritable(key) ||
             configurable != memberConfigurable(key) ||
@@ -125,11 +125,11 @@ public class ObjectValue {
         values.put(key, val);
         return true;
     }
-    public final boolean defineProperty(Context ctx, Object key, Object val) {
+    public final boolean defineProperty(Extensions ext, Object key, Object val) {
-        return defineProperty(ctx, key, val, true, true, true);
+        return defineProperty(ext, key, val, true, true, true);
     }
-    public final boolean defineProperty(Context ctx, Object key, FunctionValue getter, FunctionValue setter, boolean configurable, boolean enumerable) {
+    public final boolean defineProperty(Extensions ext, Object key, FunctionValue getter, FunctionValue setter, boolean configurable, boolean enumerable) {
-        key = Values.normalize(ctx, key);
+        key = Values.normalize(ext, key);
         if (
             properties.containsKey(key) &&
             properties.get(key).getter == getter &&
@@ -152,19 +152,19 @@ public class ObjectValue {
         return true;
     }
 
-    public ObjectValue getPrototype(Context ctx) {
+    public ObjectValue getPrototype(Extensions ext) {
+        if (prototype instanceof ObjectValue || prototype == null) return (ObjectValue)prototype;
+
         try {
-            if (prototype == OBJ_PROTO) return ctx.get(Environment.OBJECT_PROTO);
+            if (prototype == ARR_PROTO) return ext.get(Environment.ARRAY_PROTO);
-            if (prototype == ARR_PROTO) return ctx.get(Environment.ARRAY_PROTO);
+            if (prototype == FUNC_PROTO) return ext.get(Environment.FUNCTION_PROTO);
-            if (prototype == FUNC_PROTO) return ctx.get(Environment.FUNCTION_PROTO);
+            if (prototype == ERR_PROTO) return ext.get(Environment.ERROR_PROTO);
-            if (prototype == ERR_PROTO) return ctx.get(Environment.ERROR_PROTO);
+            if (prototype == RANGE_ERR_PROTO) return ext.get(Environment.RANGE_ERR_PROTO);
-            if (prototype == RANGE_ERR_PROTO) return ctx.get(Environment.RANGE_ERR_PROTO);
+            if (prototype == SYNTAX_ERR_PROTO) return ext.get(Environment.SYNTAX_ERR_PROTO);
-            if (prototype == SYNTAX_ERR_PROTO) return ctx.get(Environment.SYNTAX_ERR_PROTO);
+            if (prototype == TYPE_ERR_PROTO) return ext.get(Environment.TYPE_ERR_PROTO);
-            if (prototype == TYPE_ERR_PROTO) return ctx.get(Environment.TYPE_ERR_PROTO);
+            return ext.get(Environment.OBJECT_PROTO);
         }
         catch (NullPointerException e) { return null; }
-
-        return (ObjectValue)prototype;
     }
     public final boolean setPrototype(PlaceholderProto val) {
         if (!extensible()) return false;
@@ -185,10 +185,10 @@ public class ObjectValue {
      * A method, used to get the value of a field. If a property is bound to
      * this key, but not a field, this method should return null.
      */
-    protected Object getField(Context ctx, Object key) {
+    protected Object getField(Extensions ext, Object key) {
         if (values.containsKey(key)) return values.get(key);
-        var proto = getPrototype(ctx);
+        var proto = getPrototype(ext);
-        if (proto != null) return proto.getField(ctx, key);
+        if (proto != null) return proto.getField(ext, key);
         else return null;
     }
     /**
@@ -196,9 +196,9 @@ public class ObjectValue {
      * bound to this key, a new field should be created with the given value
      * @return Whether or not the operation was successful
      */
-    protected boolean setField(Context ctx, Object key, Object val) {
+    protected boolean setField(Extensions ext, Object key, Object val) {
         if (val instanceof FunctionValue && ((FunctionValue)val).name.equals("")) {
-            ((FunctionValue)val).name = Values.toString(ctx, key);
+            ((FunctionValue)val).name = Values.toString(ext, key);
         }
 
         values.put(key, val);
@@ -207,40 +207,40 @@ public class ObjectValue {
     /**
      * Deletes the field bound to the given key.
      */
-    protected void deleteField(Context ctx, Object key) {
+    protected void deleteField(Extensions ext, Object key) {
         values.remove(key);
     }
     /**
      * Returns whether or not there is a field bound to the given key.
      * This must ignore properties
      */
-    protected boolean hasField(Context ctx, Object key) {
+    protected boolean hasField(Extensions ext, Object key) {
         return values.containsKey(key);
     }
 
-    public final Object getMember(Context ctx, Object key, Object thisArg) {
+    public final Object getMember(Extensions ext, Object key, Object thisArg) {
-        key = Values.normalize(ctx, key);
+        key = Values.normalize(ext, key);
 
         if ("__proto__".equals(key)) {
-            var res = getPrototype(ctx);
+            var res = getPrototype(ext);
             return res == null ? Values.NULL : res;
         }
 
-        var prop = getProperty(ctx, key);
+        var prop = getProperty(ext, key);
 
         if (prop != null) {
             if (prop.getter == null) return null;
-            else return prop.getter.call(ctx, Values.normalize(ctx, thisArg));
+            else return prop.getter.call(ext, Values.normalize(ext, thisArg));
         }
-        else return getField(ctx, key);
+        else return getField(ext, key);
     }
-    public final boolean setMember(Context ctx, Object key, Object val, Object thisArg, boolean onlyProps) {
+    public final boolean setMember(Extensions ext, Object key, Object val, Object thisArg, boolean onlyProps) {
-        key = Values.normalize(ctx, key); val = Values.normalize(ctx, val);
+        key = Values.normalize(ext, key); val = Values.normalize(ext, val);
 
-        var prop = getProperty(ctx, key);
+        var prop = getProperty(ext, key);
         if (prop != null) {
             if (prop.setter == null) return false;
-            prop.setter.call(ctx, Values.normalize(ctx, thisArg), val);
+            prop.setter.call(ext, Values.normalize(ext, thisArg), val);
             return true;
         }
         else if (onlyProps) return false;
@@ -249,32 +249,32 @@ public class ObjectValue {
             values.put(key, val);
             return true;
         }
-        else if ("__proto__".equals(key)) return setPrototype(ctx, val);
+        else if ("__proto__".equals(key)) return setPrototype(ext, val);
         else if (nonWritableSet.contains(key)) return false;
-        else return setField(ctx, key, val);
+        else return setField(ext, key, val);
     }
-    public final boolean hasMember(Context ctx, Object key, boolean own) {
+    public final boolean hasMember(Extensions ext, Object key, boolean own) {
-        key = Values.normalize(ctx, key);
+        key = Values.normalize(ext, key);
 
         if (key != null && "__proto__".equals(key)) return true;
-        if (hasField(ctx, key)) return true;
+        if (hasField(ext, key)) return true;
         if (properties.containsKey(key)) return true;
         if (own) return false;
-        var proto = getPrototype(ctx);
+        var proto = getPrototype(ext);
-        return proto != null && proto.hasMember(ctx, key, own);
+        return proto != null && proto.hasMember(ext, key, own);
     }
-    public final boolean deleteMember(Context ctx, Object key) {
+    public final boolean deleteMember(Extensions ext, Object key) {
-        key = Values.normalize(ctx, key);
+        key = Values.normalize(ext, key);
 
         if (!memberConfigurable(key)) return false;
         properties.remove(key);
         nonWritableSet.remove(key);
         nonEnumerableSet.remove(key);
-        deleteField(ctx, key);
+        deleteField(ext, key);
         return true;
     }
-    public final boolean setPrototype(Context ctx, Object val) {
+    public final boolean setPrototype(Extensions ext, Object val) {
-        val = Values.normalize(ctx, val);
+        val = Values.normalize(ext, val);
 
         if (!extensible()) return false;
         if (val == null || val == Values.NULL) {
@@ -284,14 +284,14 @@ public class ObjectValue {
         else if (val instanceof ObjectValue) {
             var obj = (ObjectValue)val;
 
-            if (ctx != null) {
+            if (ext != null) {
-                if (obj == ctx.get(Environment.OBJECT_PROTO)) prototype = OBJ_PROTO;
+                if (obj == ext.get(Environment.OBJECT_PROTO)) prototype = OBJ_PROTO;
-                else if (obj == ctx.get(Environment.ARRAY_PROTO)) prototype = ARR_PROTO;
+                else if (obj == ext.get(Environment.ARRAY_PROTO)) prototype = ARR_PROTO;
-                else if (obj == ctx.get(Environment.FUNCTION_PROTO)) prototype = FUNC_PROTO;
+                else if (obj == ext.get(Environment.FUNCTION_PROTO)) prototype = FUNC_PROTO;
-                else if (obj == ctx.get(Environment.ERROR_PROTO)) prototype = ERR_PROTO;
+                else if (obj == ext.get(Environment.ERROR_PROTO)) prototype = ERR_PROTO;
-                else if (obj == ctx.get(Environment.SYNTAX_ERR_PROTO)) prototype = SYNTAX_ERR_PROTO;
+                else if (obj == ext.get(Environment.SYNTAX_ERR_PROTO)) prototype = SYNTAX_ERR_PROTO;
-                else if (obj == ctx.get(Environment.TYPE_ERR_PROTO)) prototype = TYPE_ERR_PROTO;
+                else if (obj == ext.get(Environment.TYPE_ERR_PROTO)) prototype = TYPE_ERR_PROTO;
-                else if (obj == ctx.get(Environment.RANGE_ERR_PROTO)) prototype = RANGE_ERR_PROTO;
+                else if (obj == ext.get(Environment.RANGE_ERR_PROTO)) prototype = RANGE_ERR_PROTO;
                 else prototype = obj;
             }
             else prototype = obj;
@@ -301,22 +301,22 @@ public class ObjectValue {
         return false;
     }
 
-    public final ObjectValue getMemberDescriptor(Context ctx, Object key) {
+    public final ObjectValue getMemberDescriptor(Extensions ext, Object key) {
-        key = Values.normalize(ctx, key);
+        key = Values.normalize(ext, key);
 
         var prop = properties.get(key);
         var res = new ObjectValue();
 
-        res.defineProperty(ctx, "configurable", memberConfigurable(key));
+        res.defineProperty(ext, "configurable", memberConfigurable(key));
-        res.defineProperty(ctx, "enumerable", memberEnumerable(key));
+        res.defineProperty(ext, "enumerable", memberEnumerable(key));
 
         if (prop != null) {
-            res.defineProperty(ctx, "get", prop.getter);
+            res.defineProperty(ext, "get", prop.getter);
-            res.defineProperty(ctx, "set", prop.setter);
+            res.defineProperty(ext, "set", prop.setter);
         }
-        else if (hasField(ctx, key)) {
+        else if (hasField(ext, key)) {
-            res.defineProperty(ctx, "value", values.get(key));
+            res.defineProperty(ext, "value", values.get(key));
-            res.defineProperty(ctx, "writable", memberWritable(key));
+            res.defineProperty(ext, "writable", memberWritable(key));
         }
         else return null;
         return res;
@@ -337,10 +337,10 @@ public class ObjectValue {
         return res;
     }
 
-    public ObjectValue(Context ctx, Map<?, ?> values) {
+    public ObjectValue(Extensions ext, Map<?, ?> values) {
         this(PlaceholderProto.OBJECT);
         for (var el : values.entrySet()) {
-            defineProperty(ctx, el.getKey(), el.getValue());
+            defineProperty(ext, el.getKey(), el.getValue());
         }
     }
     public ObjectValue(PlaceholderProto proto) {

src/java/me/topchetoeu/jscript/runtime/values/ScopeValue.java

@@ -1,41 +1,41 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import java.util.HashMap;
 import java.util.List;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.runtime.scope.ValueVariable;
 
 public class ScopeValue extends ObjectValue {
     public final ValueVariable[] variables;
     public final HashMap<String, Integer> names = new HashMap<>();
 
     @Override
-    protected Object getField(Context ctx, Object key) {
+    protected Object getField(Extensions ext, Object key) {
-        if (names.containsKey(key)) return variables[names.get(key)].get(ctx);
+        if (names.containsKey(key)) return variables[names.get(key)].get(ext);
-        return super.getField(ctx, key);
+        return super.getField(ext, key);
     }
     @Override
-    protected boolean setField(Context ctx, Object key, Object val) {
+    protected boolean setField(Extensions ext, Object key, Object val) {
         if (names.containsKey(key)) {
-            variables[names.get(key)].set(ctx, val);
+            variables[names.get(key)].set(ext, val);
             return true;
         }
 
-        var proto = getPrototype(ctx);
+        var proto = getPrototype(ext);
-        if (proto != null && proto.hasMember(ctx, key, false) && proto.setField(ctx, key, val)) return true;
+        if (proto != null && proto.hasMember(ext, key, false) && proto.setField(ext, key, val)) return true;
 
-        return super.setField(ctx, key, val);
+        return super.setField(ext, key, val);
     }
     @Override
-    protected void deleteField(Context ctx, Object key) {
+    protected void deleteField(Extensions ext, Object key) {
         if (names.containsKey(key)) return;
-        super.deleteField(ctx, key);
+        super.deleteField(ext, key);
     }
     @Override
-    protected boolean hasField(Context ctx, Object key) {
+    protected boolean hasField(Extensions ext, Object key) {
         if (names.containsKey(key)) return true;
-        return super.hasField(ctx, key);
+        return super.hasField(ext, key);
     }
     @Override
     public List<Object> keys(boolean includeNonEnumerable) {

src/java/me/topchetoeu/jscript/runtime/values/Symbol.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import java.util.HashMap;
 

src/java/me/topchetoeu/jscript/runtime/values/Values.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.core.values;
+package me.topchetoeu.jscript.runtime.values;
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
@@ -13,13 +13,14 @@ import java.util.List;
 import java.util.Map;
 
 import me.topchetoeu.jscript.common.Operation;
-import me.topchetoeu.jscript.core.Context;
-import me.topchetoeu.jscript.core.Environment;
-import me.topchetoeu.jscript.core.debug.DebugContext;
-import me.topchetoeu.jscript.core.exceptions.ConvertException;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
 import me.topchetoeu.jscript.lib.PromiseLib;
+import me.topchetoeu.jscript.runtime.Environment;
+import me.topchetoeu.jscript.runtime.Extensions;
+import me.topchetoeu.jscript.runtime.debug.DebugContext;
+import me.topchetoeu.jscript.runtime.exceptions.ConvertException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+import me.topchetoeu.jscript.utils.interop.NativeWrapperProvider;
 
 public class Values {
     public static enum CompareResult {
@@ -58,9 +59,8 @@ public class Values {
 
     @SuppressWarnings("unchecked")
     public static <T> T wrapper(Object val, Class<T> clazz) { 
-        if (!isWrapper(val)) val = new NativeWrapper(val);
+        if (isWrapper(val)) val = ((NativeWrapper)val).wrapped;
-        var res = (NativeWrapper)val;
+        if (val != null && clazz.isInstance(val)) return (T)val;
-        if (res != null && clazz.isInstance(res.wrapped)) return (T)res.wrapped;
         else return null;
     }
 
@@ -74,11 +74,11 @@ public class Values {
         return "object";
     }
 
-    private static Object tryCallConvertFunc(Context ctx, Object obj, String name) {
+    private static Object tryCallConvertFunc(Extensions ext, Object obj, String name) {
-        var func = getMember(ctx, obj, name);
+        var func = getMember(ext, obj, name);
 
         if (func instanceof FunctionValue) {
-            var res = Values.call(ctx, func, obj);
+            var res = Values.call(ext, func, obj);
             if (isPrimitive(res)) return res;
         }
 
@@ -95,16 +95,16 @@ public class Values {
             obj == NULL;
     }
 
-    public static Object toPrimitive(Context ctx, Object obj, ConvertHint hint) {
+    public static Object toPrimitive(Extensions ext, Object obj, ConvertHint hint) {
-        obj = normalize(ctx, obj);
+        obj = normalize(ext, obj);
         if (isPrimitive(obj)) return obj;
 
         var first = hint == ConvertHint.VALUEOF ? "valueOf" : "toString";
         var second = hint == ConvertHint.VALUEOF ? "toString" : "valueOf";
 
-        if (ctx != null) {
+        if (ext != null) {
-            try { return tryCallConvertFunc(ctx, obj, first); }
+            try { return tryCallConvertFunc(ext, obj, first); }
-            catch (EngineException unused) { return tryCallConvertFunc(ctx, obj, second); }
+            catch (EngineException unused) { return tryCallConvertFunc(ext, obj, second); }
         }
 
         throw EngineException.ofType("Value couldn't be converted to a primitive.");
@@ -116,8 +116,8 @@ public class Values {
         if (obj instanceof Boolean) return (Boolean)obj;
         return true;
     }
-    public static double toNumber(Context ctx, Object obj) {
+    public static double toNumber(Extensions ext, Object obj) {
-        var val = toPrimitive(ctx, obj, ConvertHint.VALUEOF);
+        var val = toPrimitive(ext, obj, ConvertHint.VALUEOF);
 
         if (val instanceof Number) return number(val);
         if (val instanceof Boolean) return ((Boolean)val) ? 1 : 0;
@@ -127,8 +127,8 @@ public class Values {
         }
         return Double.NaN;
     }
-    public static String toString(Context ctx, Object obj) {
+    public static String toString(Extensions ext, Object obj) {
-        var val = toPrimitive(ctx, obj, ConvertHint.VALUEOF);
+        var val = toPrimitive(ext, obj, ConvertHint.VALUEOF);
 
         if (val == null) return "undefined";
         if (val == NULL) return "null";
@@ -147,63 +147,63 @@ public class Values {
         return "Unknown value";
     }
 
-    public static Object add(Context ctx, Object a, Object b) {
+    public static Object add(Extensions ext, Object a, Object b) {
-        if (a instanceof String || b instanceof String) return toString(ctx, a) + toString(ctx, b);
+        if (a instanceof String || b instanceof String) return toString(ext, a) + toString(ext, b);
-        else return toNumber(ctx, a) + toNumber(ctx, b);
+        else return toNumber(ext, a) + toNumber(ext, b);
     }
-    public static double subtract(Context ctx, Object a, Object b) {
+    public static double subtract(Extensions ext, Object a, Object b) {
-        return toNumber(ctx, a) - toNumber(ctx, b);
+        return toNumber(ext, a) - toNumber(ext, b);
     }
-    public static double multiply(Context ctx, Object a, Object b) {
+    public static double multiply(Extensions ext, Object a, Object b) {
-        return toNumber(ctx, a) * toNumber(ctx, b);
+        return toNumber(ext, a) * toNumber(ext, b);
     }
-    public static double divide(Context ctx, Object a, Object b) {
+    public static double divide(Extensions ext, Object a, Object b) {
-        return toNumber(ctx, a) / toNumber(ctx, b);
+        return toNumber(ext, a) / toNumber(ext, b);
     }
-    public static double modulo(Context ctx, Object a, Object b) {
+    public static double modulo(Extensions ext, Object a, Object b) {
-        return toNumber(ctx, a) % toNumber(ctx, b);
+        return toNumber(ext, a) % toNumber(ext, b);
     }
     
-    public static double negative(Context ctx, Object obj) {
+    public static double negative(Extensions ext, Object obj) {
-        return -toNumber(ctx, obj);
+        return -toNumber(ext, obj);
     }
 
-    public static int and(Context ctx, Object a, Object b) {
+    public static int and(Extensions ext, Object a, Object b) {
-        return (int)toNumber(ctx, a) & (int)toNumber(ctx, b);
+        return (int)toNumber(ext, a) & (int)toNumber(ext, b);
     }
-    public static int or(Context ctx, Object a, Object b) {
+    public static int or(Extensions ext, Object a, Object b) {
-        return (int)toNumber(ctx, a) | (int)toNumber(ctx, b);
+        return (int)toNumber(ext, a) | (int)toNumber(ext, b);
     }
-    public static int xor(Context ctx, Object a, Object b) {
+    public static int xor(Extensions ext, Object a, Object b) {
-        return (int)toNumber(ctx, a) ^ (int)toNumber(ctx, b);
+        return (int)toNumber(ext, a) ^ (int)toNumber(ext, b);
     }
-    public static int bitwiseNot(Context ctx, Object obj) {
+    public static int bitwiseNot(Extensions ext, Object obj) {
-        return ~(int)toNumber(ctx, obj);
+        return ~(int)toNumber(ext, obj);
     }
 
-    public static int shiftLeft(Context ctx, Object a, Object b) {
+    public static int shiftLeft(Extensions ext, Object a, Object b) {
-        return (int)toNumber(ctx, a) << (int)toNumber(ctx, b);
+        return (int)toNumber(ext, a) << (int)toNumber(ext, b);
     }
-    public static int shiftRight(Context ctx, Object a, Object b) {
+    public static int shiftRight(Extensions ext, Object a, Object b) {
-        return (int)toNumber(ctx, a) >> (int)toNumber(ctx, b);
+        return (int)toNumber(ext, a) >> (int)toNumber(ext, b);
     }
-    public static long unsignedShiftRight(Context ctx, Object a, Object b) {
+    public static long unsignedShiftRight(Extensions ext, Object a, Object b) {
-        long _a = (long)toNumber(ctx, a);
+        long _a = (long)toNumber(ext, a);
-        long _b = (long)toNumber(ctx, b);
+        long _b = (long)toNumber(ext, b);
 
         if (_a < 0) _a += 0x100000000l;
         if (_b < 0) _b += 0x100000000l;
         return _a >>> _b;
     }
 
-    public static CompareResult compare(Context ctx, Object a, Object b) {
+    public static CompareResult compare(Extensions ext, Object a, Object b) {
-        a = toPrimitive(ctx, a, ConvertHint.VALUEOF);
+        a = toPrimitive(ext, a, ConvertHint.VALUEOF);
-        b = toPrimitive(ctx, b, ConvertHint.VALUEOF);
+        b = toPrimitive(ext, b, ConvertHint.VALUEOF);
 
         if (a instanceof String && b instanceof String) CompareResult.from(((String)a).compareTo((String)b));
 
-        var _a = toNumber(ctx, a);
+        var _a = toNumber(ext, a);
-        var _b = toNumber(ctx, b);
+        var _b = toNumber(ext, b);
 
         if (Double.isNaN(_a) || Double.isNaN(_b)) return CompareResult.NOT_EQUAL;
 
@@ -214,60 +214,60 @@ public class Values {
         return !toBoolean(obj);
     }
 
-    public static boolean isInstanceOf(Context ctx, Object obj, Object proto) {
+    public static boolean isInstanceOf(Extensions ext, Object obj, Object proto) {
         if (obj == null || obj == NULL || proto == null || proto == NULL) return false;
-        var val = getPrototype(ctx, obj);
+        var val = getPrototype(ext, obj);
 
         while (val != null) {
             if (val.equals(proto)) return true;
-            val = val.getPrototype(ctx);
+            val = val.getPrototype(ext);
         }
 
         return false;
     }
 
-    public static Object operation(Context ctx, Operation op, Object ...args) {
+    public static Object operation(Extensions ext, Operation op, Object ...args) {
         switch (op) {
-            case ADD: return add(ctx, args[0], args[1]);
+            case ADD: return add(ext, args[0], args[1]);
-            case SUBTRACT: return subtract(ctx, args[0], args[1]);
+            case SUBTRACT: return subtract(ext, args[0], args[1]);
-            case DIVIDE: return divide(ctx, args[0], args[1]);
+            case DIVIDE: return divide(ext, args[0], args[1]);
-            case MULTIPLY: return multiply(ctx, args[0], args[1]);
+            case MULTIPLY: return multiply(ext, args[0], args[1]);
-            case MODULO: return modulo(ctx, args[0], args[1]);
+            case MODULO: return modulo(ext, args[0], args[1]);
 
-            case AND: return and(ctx, args[0], args[1]);
+            case AND: return and(ext, args[0], args[1]);
-            case OR: return or(ctx, args[0], args[1]);
+            case OR: return or(ext, args[0], args[1]);
-            case XOR: return xor(ctx, args[0], args[1]);
+            case XOR: return xor(ext, args[0], args[1]);
 
-            case EQUALS: return strictEquals(ctx, args[0], args[1]);
+            case EQUALS: return strictEquals(ext, args[0], args[1]);
-            case NOT_EQUALS: return !strictEquals(ctx, args[0], args[1]);
+            case NOT_EQUALS: return !strictEquals(ext, args[0], args[1]);
-            case LOOSE_EQUALS: return looseEqual(ctx, args[0], args[1]);
+            case LOOSE_EQUALS: return looseEqual(ext, args[0], args[1]);
-            case LOOSE_NOT_EQUALS: return !looseEqual(ctx, args[0], args[1]);
+            case LOOSE_NOT_EQUALS: return !looseEqual(ext, args[0], args[1]);
 
-            case GREATER: return compare(ctx, args[0], args[1]).greater();
+            case GREATER: return compare(ext, args[0], args[1]).greater();
-            case GREATER_EQUALS: return compare(ctx, args[0], args[1]).greaterOrEqual();
+            case GREATER_EQUALS: return compare(ext, args[0], args[1]).greaterOrEqual();
-            case LESS: return compare(ctx, args[0], args[1]).less();
+            case LESS: return compare(ext, args[0], args[1]).less();
-            case LESS_EQUALS: return compare(ctx, args[0], args[1]).lessOrEqual();
+            case LESS_EQUALS: return compare(ext, args[0], args[1]).lessOrEqual();
 
-            case INVERSE: return bitwiseNot(ctx, args[0]);
+            case INVERSE: return bitwiseNot(ext, args[0]);
             case NOT: return not(args[0]);
-            case POS: return toNumber(ctx, args[0]);
+            case POS: return toNumber(ext, args[0]);
-            case NEG: return negative(ctx, args[0]);
+            case NEG: return negative(ext, args[0]);
 
-            case SHIFT_LEFT: return shiftLeft(ctx, args[0], args[1]);
+            case SHIFT_LEFT: return shiftLeft(ext, args[0], args[1]);
-            case SHIFT_RIGHT: return shiftRight(ctx, args[0], args[1]);
+            case SHIFT_RIGHT: return shiftRight(ext, args[0], args[1]);
-            case USHIFT_RIGHT: return unsignedShiftRight(ctx, args[0], args[1]);
+            case USHIFT_RIGHT: return unsignedShiftRight(ext, args[0], args[1]);
 
-            case IN: return hasMember(ctx, args[1], args[0], false);
+            case IN: return hasMember(ext, args[1], args[0], false);
             case INSTANCEOF: {
-                var proto = getMember(ctx, args[1], "prototype");
+                var proto = getMember(ext, args[1], "prototype");
-                return isInstanceOf(ctx, args[0], proto);
+                return isInstanceOf(ext, args[0], proto);
             }
 
             default: return null;
         }
     }
 
-    public static Object getMember(Context ctx, Object obj, Object key) {
+    public static Object getMember(Extensions ctx, Object obj, Object key) {
         obj = normalize(ctx, obj); key = normalize(ctx, key);
         if (obj == null) throw new IllegalArgumentException("Tried to access member of undefined.");
         if (obj == NULL) throw new IllegalArgumentException("Tried to access member of null.");
@@ -287,12 +287,12 @@ public class Values {
         else if (key != null && "__proto__".equals(key)) return proto;
         else return proto.getMember(ctx, key, obj);
     }
-    public static Object getMemberPath(Context ctx, Object obj, Object ...path) {
+    public static Object getMemberPath(Extensions ctx, Object obj, Object ...path) {
         var res = obj;
         for (var key : path) res = getMember(ctx, res, key);
         return res;
     }
-    public static boolean setMember(Context ctx, Object obj, Object key, Object val) {
+    public static boolean setMember(Extensions ctx, Object obj, Object key, Object val) {
         obj = normalize(ctx, obj); key = normalize(ctx, key); val = normalize(ctx, val);
         if (obj == null) throw EngineException.ofType("Tried to access member of undefined.");
         if (obj == NULL) throw EngineException.ofType("Tried to access member of null.");
@@ -302,7 +302,7 @@ public class Values {
         var proto = getPrototype(ctx, obj);
         return proto.setMember(ctx, key, val, obj, true);
     }
-    public static boolean hasMember(Context ctx, Object obj, Object key, boolean own) {
+    public static boolean hasMember(Extensions ctx, Object obj, Object key, boolean own) {
         if (obj == null || obj == NULL) return false;
         obj = normalize(ctx, obj); key = normalize(ctx, key);
 
@@ -320,36 +320,36 @@ public class Values {
         var proto = getPrototype(ctx, obj);
         return proto != null && proto.hasMember(ctx, key, own);
     }
-    public static boolean deleteMember(Context ctx, Object obj, Object key) {
+    public static boolean deleteMember(Extensions ext, Object obj, Object key) {
         if (obj == null || obj == NULL) return false;
-        obj = normalize(ctx, obj); key = normalize(ctx, key);
+        obj = normalize(ext, obj); key = normalize(ext, key);
 
-        if (obj instanceof ObjectValue) return ((ObjectValue)obj).deleteMember(ctx, key);
+        if (obj instanceof ObjectValue) return ((ObjectValue)obj).deleteMember(ext, key);
         else return false;
     }
-    public static ObjectValue getPrototype(Context ctx, Object obj) {
+    public static ObjectValue getPrototype(Extensions ext, Object obj) {
         if (obj == null || obj == NULL) return null;
-        obj = normalize(ctx, obj);
+        obj = normalize(ext, obj);
-        if (obj instanceof ObjectValue) return ((ObjectValue)obj).getPrototype(ctx);
+        if (obj instanceof ObjectValue) return ((ObjectValue)obj).getPrototype(ext);
-        if (ctx == null) return null;
+        if (ext == null) return null;
 
-        if (obj instanceof String) return ctx.get(Environment.STRING_PROTO);
+        if (obj instanceof String) return ext.get(Environment.STRING_PROTO);
-        else if (obj instanceof Number) return ctx.get(Environment.NUMBER_PROTO);
+        else if (obj instanceof Number) return ext.get(Environment.NUMBER_PROTO);
-        else if (obj instanceof Boolean) return ctx.get(Environment.BOOL_PROTO);
+        else if (obj instanceof Boolean) return ext.get(Environment.BOOL_PROTO);
-        else if (obj instanceof Symbol) return ctx.get(Environment.SYMBOL_PROTO);
+        else if (obj instanceof Symbol) return ext.get(Environment.SYMBOL_PROTO);
 
         return null;
     }
-    public static boolean setPrototype(Context ctx, Object obj, Object proto) {
+    public static boolean setPrototype(Extensions ext, Object obj, Object proto) {
-        obj = normalize(ctx, obj);
+        obj = normalize(ext, obj);
-        return obj instanceof ObjectValue && ((ObjectValue)obj).setPrototype(ctx, proto);
+        return obj instanceof ObjectValue && ((ObjectValue)obj).setPrototype(ext, proto);
     }
-    public static void makePrototypeChain(Context ctx, Object... chain) {
+    public static void makePrototypeChain(Extensions ext, Object... chain) {
         for(var i = 1; i < chain.length; i++) {
-            setPrototype(ctx, chain[i], chain[i - 1]);
+            setPrototype(ext, chain[i], chain[i - 1]);
         }
     }
-    public static List<Object> getMembers(Context ctx, Object obj, boolean own, boolean includeNonEnumerable) {  
+    public static List<Object> getMembers(Extensions ext, Object obj, boolean own, boolean includeNonEnumerable) {  
         List<Object> res = new ArrayList<>();
 
         if (obj instanceof ObjectValue) res = ((ObjectValue)obj).keys(includeNonEnumerable);
@@ -358,26 +358,26 @@ public class Values {
         }
 
         if (!own) {
-            var proto = getPrototype(ctx, obj);
+            var proto = getPrototype(ext, obj);
 
             while (proto != null) {
                 res.addAll(proto.keys(includeNonEnumerable));
-                proto = getPrototype(ctx, proto);
+                proto = getPrototype(ext, proto);
             }
         }
 
 
         return res;
     }
-    public static ObjectValue getMemberDescriptor(Context ctx, Object obj, Object key) {
+    public static ObjectValue getMemberDescriptor(Extensions ext, Object obj, Object key) {
-        if (obj instanceof ObjectValue) return ((ObjectValue)obj).getMemberDescriptor(ctx, key);
+        if (obj instanceof ObjectValue) return ((ObjectValue)obj).getMemberDescriptor(ext, key);
         else if (obj instanceof String && key instanceof Number) {
             var i = ((Number)key).intValue();
             var _i = ((Number)key).doubleValue();
             if (i - _i != 0) return null;
             if (i < 0 || i >= ((String)obj).length()) return null;
 
-            return new ObjectValue(ctx, Map.of(
+            return new ObjectValue(ext, Map.of(
                 "value", ((String)obj).charAt(i) + "",
                 "writable", false,
                 "enumerable", true,
@@ -387,17 +387,17 @@ public class Values {
         else return null;
     }
 
-    public static Object call(Context ctx, Object func, Object thisArg, Object ...args) {
+    public static Object call(Extensions ext, Object func, Object thisArg, Object ...args) {
         if (!(func instanceof FunctionValue)) throw EngineException.ofType("Tried to call a non-function value.");
-        return ((FunctionValue)func).call(ctx, thisArg, args);
+        return ((FunctionValue)func).call(ext, thisArg, args);
     }
-    public static Object callNew(Context ctx, Object func, Object ...args) {
+    public static Object callNew(Extensions ext, Object func, Object ...args) {
         var res = new ObjectValue();
         try {
-            var proto = Values.getMember(ctx, func, "prototype");
+            var proto = Values.getMember(ext, func, "prototype");
-            setPrototype(ctx, res, proto);
+            setPrototype(ext, res, proto);
 
-            var ret = call(ctx, func, res, args);
+            var ret = call(ext, func, res, args);
 
             if (!isPrimitive(ret)) return ret;
             return res;
@@ -407,8 +407,9 @@ public class Values {
         }
     }
 
-    public static boolean strictEquals(Context ctx, Object a, Object b) {
+    public static boolean strictEquals(Extensions ext, Object a, Object b) {
-        a = normalize(ctx, a); b = normalize(ctx, b);
+        a = normalize(ext, a);
+        b = normalize(ext, b);
 
         if (a == null || b == null) return a == null && b == null;
         if (isNan(a) || isNan(b)) return false;
@@ -417,8 +418,8 @@ public class Values {
 
         return a == b || a.equals(b);
     }
-    public static boolean looseEqual(Context ctx, Object a, Object b) {
+    public static boolean looseEqual(Extensions ext, Object a, Object b) {
-        a = normalize(ctx, a); b = normalize(ctx, b);
+        a = normalize(ext, a); b = normalize(ext, b);
 
         // In loose equality, null is equivalent to undefined
         if (a == NULL) a = null;
@@ -429,19 +430,19 @@ public class Values {
         if (!isPrimitive(a) && !isPrimitive(b)) return a == b;
 
         // Convert values to primitives
-        a = toPrimitive(ctx, a, ConvertHint.VALUEOF);
+        a = toPrimitive(ext, a, ConvertHint.VALUEOF);
-        b = toPrimitive(ctx, b, ConvertHint.VALUEOF);
+        b = toPrimitive(ext, b, ConvertHint.VALUEOF);
 
         // Compare symbols by reference
         if (a instanceof Symbol || b instanceof Symbol) return a == b;
         if (a instanceof Boolean || b instanceof Boolean) return toBoolean(a) == toBoolean(b);
-        if (a instanceof Number || b instanceof Number) return strictEquals(ctx, toNumber(ctx, a), toNumber(ctx, b));
+        if (a instanceof Number || b instanceof Number) return strictEquals(ext, toNumber(ext, a), toNumber(ext, b));
 
         // Default to strings
-        return toString(ctx, a).equals(toString(ctx, b));
+        return toString(ext, a).equals(toString(ext, b));
     }
 
-    public static Object normalize(Context ctx, Object val) {
+    public static Object normalize(Extensions ext, Object val) {
         if (val instanceof Number) return number(val);
         if (isPrimitive(val) || val instanceof ObjectValue) return val;
         if (val instanceof Character) return val + "";
@@ -450,7 +451,7 @@ public class Values {
             var res = new ObjectValue();
 
             for (var entry : ((Map<?, ?>)val).entrySet()) {
-                res.defineProperty(ctx, entry.getKey(), entry.getValue());
+                res.defineProperty(ext, entry.getKey(), entry.getValue());
             }
 
             return res;
@@ -460,22 +461,22 @@ public class Values {
             var res = new ArrayValue();
 
             for (var entry : ((Iterable<?>)val)) {
-                res.set(ctx, res.size(), entry);
+                res.set(ext, res.size(), entry);
             }
 
             return res;
         }
 
         if (val instanceof Class) {
-            if (ctx == null) return null;
+            if (ext == null) return null;
-            else return ctx.environment.wrappers.getConstr((Class<?>)val);
+            else return NativeWrapperProvider.get(ext).getConstr((Class<?>)val);
         }
 
-        return new NativeWrapper(val);
+        return NativeWrapper.of(ext, val);
     }
 
     @SuppressWarnings("unchecked")
-    public static <T> T convert(Context ctx, Object obj, Class<T> clazz) {
+    public static <T> T convert(Extensions ext, Object obj, Class<T> clazz) {
         if (clazz == Void.class) return null;
 
         if (obj instanceof NativeWrapper) {
@@ -489,19 +490,19 @@ public class Values {
             if (clazz.isAssignableFrom(ArrayList.class)) {
                 var raw = ((ArrayValue)obj).toArray();
                 var res = new ArrayList<>();
-                for (var i = 0; i < raw.length; i++) res.add(convert(ctx, raw[i], Object.class));
+                for (var i = 0; i < raw.length; i++) res.add(convert(ext, raw[i], Object.class));
                 return (T)new ArrayList<>(res);
             }
             if (clazz.isAssignableFrom(HashSet.class)) {
                 var raw = ((ArrayValue)obj).toArray();
                 var res = new HashSet<>();
-                for (var i = 0; i < raw.length; i++) res.add(convert(ctx, raw[i], Object.class));
+                for (var i = 0; i < raw.length; i++) res.add(convert(ext, raw[i], Object.class));
                 return (T)new HashSet<>(res);
             }
             if (clazz.isArray()) {
                 var raw = ((ArrayValue)obj).toArray();
                 Object res = Array.newInstance(clazz.getComponentType(), raw.length);
-                for (var i = 0; i < raw.length; i++) Array.set(res, i, convert(ctx, raw[i], Object.class));
+                for (var i = 0; i < raw.length; i++) Array.set(res, i, convert(ext, raw[i], Object.class));
                 return (T)res;
             }
         }
@@ -509,25 +510,25 @@ public class Values {
         if (obj instanceof ObjectValue && clazz.isAssignableFrom(HashMap.class)) {
             var res = new HashMap<>();
             for (var el : ((ObjectValue)obj).values.entrySet()) res.put(
-                convert(ctx, el.getKey(), null),
+                convert(ext, el.getKey(), null),
-                convert(ctx, el.getValue(), null)
+                convert(ext, el.getValue(), null)
             );
             return (T)res;
         }
 
-        if (clazz == String.class) return (T)toString(ctx, obj);
+        if (clazz == String.class) return (T)toString(ext, obj);
         if (clazz == Boolean.class || clazz == Boolean.TYPE) return (T)(Boolean)toBoolean(obj);
-        if (clazz == Byte.class || clazz == byte.class) return (T)(Byte)(byte)toNumber(ctx, obj);
+        if (clazz == Byte.class || clazz == byte.class) return (T)(Byte)(byte)toNumber(ext, obj);
-        if (clazz == Integer.class || clazz == int.class) return (T)(Integer)(int)toNumber(ctx, obj);
+        if (clazz == Integer.class || clazz == int.class) return (T)(Integer)(int)toNumber(ext, obj);
-        if (clazz == Long.class || clazz == long.class) return (T)(Long)(long)toNumber(ctx, obj);
+        if (clazz == Long.class || clazz == long.class) return (T)(Long)(long)toNumber(ext, obj);
-        if (clazz == Short.class || clazz == short.class) return (T)(Short)(short)toNumber(ctx, obj);
+        if (clazz == Short.class || clazz == short.class) return (T)(Short)(short)toNumber(ext, obj);
-        if (clazz == Float.class || clazz == float.class) return (T)(Float)(float)toNumber(ctx, obj);
+        if (clazz == Float.class || clazz == float.class) return (T)(Float)(float)toNumber(ext, obj);
-        if (clazz == Double.class || clazz == double.class) return (T)(Double)toNumber(ctx, obj);
+        if (clazz == Double.class || clazz == double.class) return (T)(Double)toNumber(ext, obj);
 
         if (clazz == Character.class || clazz == char.class) {
             if (obj instanceof Number) return (T)(Character)(char)number(obj);
             else {
-                var res = toString(ctx, obj);
+                var res = toString(ext, obj);
                 if (res.length() == 0) throw new ConvertException("\"\"", "Character");
                 else return (T)(Character)res.charAt(0);
             }
@@ -536,23 +537,23 @@ public class Values {
         if (obj == null) return null;
         if (clazz.isInstance(obj)) return (T)obj;
         if (clazz.isAssignableFrom(NativeWrapper.class)) {
-            return (T)new NativeWrapper(obj);
+            return (T)NativeWrapper.of(ext, obj);
         }
 
         throw new ConvertException(type(obj), clazz.getSimpleName());
     }
 
-    public static Iterable<Object> fromJSIterator(Context ctx, Object obj) {
+    public static Iterable<Object> fromJSIterator(Extensions ext, Object obj) {
         return () -> {
             try {
                 var symbol = Symbol.get("Symbol.iterator");
 
-                var iteratorFunc = getMember(ctx, obj, symbol);
+                var iteratorFunc = getMember(ext, obj, symbol);
                 if (!(iteratorFunc instanceof FunctionValue)) return Collections.emptyIterator();
                 var iterator = iteratorFunc instanceof FunctionValue ?
-                    ((FunctionValue)iteratorFunc).call(ctx, obj, obj) :
+                    ((FunctionValue)iteratorFunc).call(ext, obj, obj) :
                     iteratorFunc;
-                var nextFunc = getMember(ctx, call(ctx, iteratorFunc, obj), "next");
+                var nextFunc = getMember(ext, call(ext, iteratorFunc, obj), "next");
 
                 if (!(nextFunc instanceof FunctionValue)) return Collections.emptyIterator();
 
@@ -564,11 +565,11 @@ public class Values {
                     private void loadNext() {
                         if (next == null) value = null;
                         else if (consumed) {
-                            var curr = next.call(ctx, iterator);
+                            var curr = next.call(ext, iterator);
                             if (curr == null) { next = null; value = null; }
-                            if (toBoolean(Values.getMember(ctx, curr, "done"))) { next = null; value = null; }
+                            if (toBoolean(Values.getMember(ext, curr, "done"))) { next = null; value = null; }
                             else {
-                                this.value = Values.getMember(ctx, curr, "value");
+                                this.value = Values.getMember(ext, curr, "value");
                                 consumed = false;
                             }
                         }
@@ -595,17 +596,17 @@ public class Values {
         };
     }
 
-    public static ObjectValue toJSIterator(Context ctx, Iterator<?> it) {
+    public static ObjectValue toJSIterator(Extensions ext, Iterator<?> it) {
         var res = new ObjectValue();
 
         try {
-            var key = getMember(ctx, getMember(ctx, ctx.get(Environment.SYMBOL_PROTO), "constructor"), "iterator");
+            var key = getMember(ext, getMember(ext, ext.get(Environment.SYMBOL_PROTO), "constructor"), "iterator");
-            res.defineProperty(ctx, key, new NativeFunction("", args -> args.self));
+            res.defineProperty(ext, key, new NativeFunction("", args -> args.self));
         }
         catch (IllegalArgumentException | NullPointerException e) { }
 
-        res.defineProperty(ctx, "next", new NativeFunction("", args -> {
+        res.defineProperty(ext, "next", new NativeFunction("", args -> {
-            if (!it.hasNext()) return new ObjectValue(ctx, Map.of("done", true));
+            if (!it.hasNext()) return new ObjectValue(ext, Map.of("done", true));
             else {
                 var obj = new ObjectValue();
                 obj.defineProperty(args.ctx, "value", it.next());
@@ -616,22 +617,22 @@ public class Values {
         return res;
     }
 
-    public static ObjectValue toJSIterator(Context ctx, Iterable<?> it) {
+    public static ObjectValue toJSIterator(Extensions ext, Iterable<?> it) {
-        return toJSIterator(ctx, it.iterator());
+        return toJSIterator(ext, it.iterator());
     }
 
-    public static ObjectValue toJSAsyncIterator(Context ctx, Iterator<?> it) {
+    public static ObjectValue toJSAsyncIterator(Extensions ext, Iterator<?> it) {
         var res = new ObjectValue();
 
         try {
-            var key = getMemberPath(ctx, ctx.get(Environment.SYMBOL_PROTO), "constructor", "asyncIterator");
+            var key = getMemberPath(ext, ext.get(Environment.SYMBOL_PROTO), "constructor", "asyncIterator");
-            res.defineProperty(ctx, key, new NativeFunction("", args -> args.self));
+            res.defineProperty(ext, key, new NativeFunction("", args -> args.self));
         }
         catch (IllegalArgumentException | NullPointerException e) { }
 
-        res.defineProperty(ctx, "next", new NativeFunction("", args -> {
+        res.defineProperty(ext, "next", new NativeFunction("", args -> {
             return PromiseLib.await(args.ctx, () -> {
-                if (!it.hasNext()) return new ObjectValue(ctx, Map.of("done", true));
+                if (!it.hasNext()) return new ObjectValue(ext, Map.of("done", true));
                 else {
                     var obj = new ObjectValue();
                     obj.defineProperty(args.ctx, "value", it.next());
@@ -653,14 +654,14 @@ public class Values {
         if (protoObj.values.size() + protoObj.properties.size() != 1) return false;
         return true;
     }
-    private static String toReadable(Context ctx, Object val, HashSet<Object> passed, int tab) {
+    private static String toReadable(Extensions ext, Object val, HashSet<Object> passed, int tab) {
         if (tab == 0 && val instanceof String) return (String)val;
 
         if (passed.contains(val)) return "[circular]";
 
         var printed = true;
         var res = new StringBuilder();
-        var dbg = DebugContext.get(ctx);
+        var dbg = DebugContext.get(ext);
 
         if (val instanceof FunctionValue) {
             res.append(val.toString());
@@ -674,7 +675,7 @@ public class Values {
             for (int i = 0; i < obj.size(); i++) {
                 if (i != 0) res.append(", ");
                 else res.append(" ");
-                if (obj.has(i)) res.append(toReadable(ctx, obj.get(i), passed, tab));
+                if (obj.has(i)) res.append(toReadable(ext, obj.get(i), passed, tab));
                 else res.append("<empty>");
             }
             res.append(" ] ");
@@ -701,14 +702,14 @@ public class Values {
 
                 for (var el : obj.values.entrySet()) {
                     for (int i = 0; i < tab + 1; i++) res.append("    ");
-                    res.append(toReadable(ctx, el.getKey(), passed, tab + 1));
+                    res.append(toReadable(ext, el.getKey(), passed, tab + 1));
                     res.append(": ");
-                    res.append(toReadable(ctx, el.getValue(), passed, tab + 1));
+                    res.append(toReadable(ext, el.getValue(), passed, tab + 1));
                     res.append(",\n");
                 }
                 for (var el : obj.properties.entrySet()) {
                     for (int i = 0; i < tab + 1; i++) res.append("    ");
-                    res.append(toReadable(ctx, el.getKey(), passed, tab + 1));
+                    res.append(toReadable(ext, el.getKey(), passed, tab + 1));
                     res.append(": [prop],\n");
                 }
 
@@ -721,23 +722,23 @@ public class Values {
         else if (val == null) return "undefined";
         else if (val == Values.NULL) return "null";
         else if (val instanceof String) return "'" + val + "'";
-        else return Values.toString(ctx, val);
+        else return Values.toString(ext, val);
 
         return res.toString();
     }
 
-    public static String toReadable(Context ctx, Object val) {
+    public static String toReadable(Extensions ext, Object val) {
-        return toReadable(ctx, val, new HashSet<>(), 0);
+        return toReadable(ext, val, new HashSet<>(), 0);
     }
     public static String errorToReadable(RuntimeException err, String prefix) {
         prefix = prefix == null ? "Uncaught" : "Uncaught " + prefix;
         if (err instanceof EngineException) {
             var ee = ((EngineException)err);
             try {
-                return prefix + " " + ee.toString(new Context(ee.env));
+                return prefix + " " + ee.toString(ee.ext);
             }
             catch (EngineException ex) {
-                return prefix + " " + toReadable(new Context(ee.env), ee.value);
+                return prefix + " " + toReadable(ee.ext, ee.value);
             }
         }
         else if (err instanceof SyntaxException) {
@@ -751,8 +752,8 @@ public class Values {
             return prefix + " internal error " + str.toString();
         }
     }
-    public static void printValue(Context ctx, Object val) {
+    public static void printValue(Extensions ext, Object val) {
-        System.out.print(toReadable(ctx, val));
+        System.out.print(toReadable(ext, val));
     }
     public static void printError(RuntimeException err, String prefix) {
         System.out.println(errorToReadable(err, prefix));

src/java/me/topchetoeu/jscript/utils/JSCompiler.java

@@ -4,9 +4,9 @@ import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.FunctionBody;
 import me.topchetoeu.jscript.compilation.CompileResult;
 import me.topchetoeu.jscript.compilation.parsing.Parsing;
-import me.topchetoeu.jscript.core.Compiler;
+import me.topchetoeu.jscript.runtime.Compiler;
-import me.topchetoeu.jscript.core.Extensions;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.debug.DebugContext;
+import me.topchetoeu.jscript.runtime.debug.DebugContext;
 
 public class JSCompiler implements Compiler {
     public final Extensions ext;

src/java/me/topchetoeu/jscript/utils/JScriptRepl.java

@@ -8,18 +8,19 @@ import java.nio.file.Path;
 import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.common.Metadata;
 import me.topchetoeu.jscript.common.Reading;
-import me.topchetoeu.jscript.core.Compiler;
-import me.topchetoeu.jscript.core.Context;
-import me.topchetoeu.jscript.core.Engine;
-import me.topchetoeu.jscript.core.Environment;
-import me.topchetoeu.jscript.core.EventLoop;
-import me.topchetoeu.jscript.core.debug.DebugContext;
-import me.topchetoeu.jscript.core.values.NativeFunction;
-import me.topchetoeu.jscript.core.values.Values;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
-import me.topchetoeu.jscript.core.exceptions.InterruptException;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
 import me.topchetoeu.jscript.lib.Internals;
+import me.topchetoeu.jscript.runtime.Compiler;
+import me.topchetoeu.jscript.runtime.Context;
+import me.topchetoeu.jscript.runtime.Engine;
+import me.topchetoeu.jscript.runtime.Environment;
+import me.topchetoeu.jscript.runtime.EventLoop;
+import me.topchetoeu.jscript.runtime.debug.DebugContext;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
+import me.topchetoeu.jscript.runtime.scope.GlobalScope;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.values.Values;
 import me.topchetoeu.jscript.utils.debug.DebugServer;
 import me.topchetoeu.jscript.utils.debug.SimpleDebugger;
 import me.topchetoeu.jscript.utils.filesystem.Filesystem;
@@ -28,6 +29,7 @@ import me.topchetoeu.jscript.utils.filesystem.Mode;
 import me.topchetoeu.jscript.utils.filesystem.PhysicalFilesystem;
 import me.topchetoeu.jscript.utils.filesystem.RootFilesystem;
 import me.topchetoeu.jscript.utils.filesystem.STDFilesystem;
+import me.topchetoeu.jscript.utils.interop.NativeWrapperProvider;
 import me.topchetoeu.jscript.utils.modules.ModuleRepo;
 import me.topchetoeu.jscript.utils.permissions.PermissionsManager;
 import me.topchetoeu.jscript.utils.permissions.PermissionsProvider;
@@ -87,10 +89,13 @@ public class JScriptRepl {
     private static void initEnv() {
         environment = Internals.apply(environment);
 
-        environment.global.define(false, new NativeFunction("exit", args -> {
+        var wp = NativeWrapperProvider.get(environment);
+        var glob = GlobalScope.get(environment);
+
+        glob.define(null, false, new NativeFunction("exit", args -> {
             throw new InterruptException();
         }));
-        environment.global.define(false, new NativeFunction("go", args -> {
+        glob.define(null, false, new NativeFunction("go", args -> {
             try {
                 var f = Path.of("do.js");
                 var func = args.ctx.compile(new Filename("do", "do/" + j++ + ".js"), new String(Files.readAllBytes(f)));
@@ -100,7 +105,7 @@ public class JScriptRepl {
                 throw new EngineException("Couldn't open do.js");
             }
         }));
-        environment.global.define(false, new NativeFunction("log", args -> {
+        glob.define(null, false, new NativeFunction("log", args -> {
             for (var el : args.args) {
                 Values.printValue(args.ctx, el);
             }
@@ -111,7 +116,7 @@ public class JScriptRepl {
         var fs = new RootFilesystem(PermissionsProvider.get(environment));
         fs.protocols.put("temp", new MemoryFilesystem(Mode.READ_WRITE));
         fs.protocols.put("file", new PhysicalFilesystem("."));
-        fs.protocols.put("std", STDFilesystem.ofStd(System.in, System.out, System.err));
+        fs.protocols.put("std", new STDFilesystem(System.in, System.out, System.err));
 
         environment.add(PermissionsProvider.KEY, PermissionsManager.ALL_PERMS);
         environment.add(Filesystem.KEY, fs);

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

@@ -15,8 +15,8 @@ import me.topchetoeu.jscript.common.events.Notifier;
 import me.topchetoeu.jscript.common.json.JSON;
 import me.topchetoeu.jscript.common.json.JSONList;
 import me.topchetoeu.jscript.common.json.JSONMap;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
 import me.topchetoeu.jscript.utils.debug.WebSocketMessage.Type;
-import me.topchetoeu.jscript.core.exceptions.SyntaxException;
 
 public class DebugServer {
     public static String browserDisplayName = Metadata.name() + "/" + Metadata.version();
@@ -137,6 +137,13 @@ public class DebugServer {
         }
 
         runAsync(() -> {
+            var handle = new Thread(() -> {
+                System.out.println("test");
+                debugger.close();
+            });
+
+            Runtime.getRuntime().addShutdownHook(handle);
+
             try { handle(ws, debugger); }
             catch (RuntimeException | IOException e) {
                 try {
@@ -145,7 +152,11 @@ public class DebugServer {
                 }
                 catch (IOException e2) { /* Shit outta luck */ }
             }
-            finally { ws.close(); debugger.close(); }
+            finally {
+                Runtime.getRuntime().removeShutdownHook(handle);
+                ws.close();
+                debugger.close();
+            }
         }, "Debug Handler");
     }
 
@@ -164,7 +175,6 @@ public class DebugServer {
                     var req = HttpRequest.read(socket);
 
                     if (req == null) continue;
-    
                     switch (req.path) {
                         case "/json/version":
                             send(req, "{\"Browser\":\"" + browserDisplayName + "\",\"Protocol-Version\":\"1.1\"}");

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

@@ -1,8 +1,9 @@
 package me.topchetoeu.jscript.utils.debug;
 
-import me.topchetoeu.jscript.core.debug.DebugHandler;
 import java.io.IOException;
 
+import me.topchetoeu.jscript.runtime.debug.DebugHandler;
+
 public interface Debugger extends DebugHandler {
     void close();
 

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

@@ -23,25 +23,29 @@ import me.topchetoeu.jscript.common.json.JSONList;
 import me.topchetoeu.jscript.common.json.JSONMap;
 import me.topchetoeu.jscript.common.mapping.FunctionMap;
 import me.topchetoeu.jscript.compilation.parsing.Parsing;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Engine;
+import me.topchetoeu.jscript.runtime.Engine;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Environment;
-import me.topchetoeu.jscript.core.EventLoop;
+import me.topchetoeu.jscript.runtime.EventLoop;
-import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.debug.DebugContext;
+import me.topchetoeu.jscript.runtime.Frame;
-import me.topchetoeu.jscript.core.scope.GlobalScope;
+import me.topchetoeu.jscript.runtime.debug.DebugContext;
-import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.exceptions.SyntaxException;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.scope.GlobalScope;
-import me.topchetoeu.jscript.core.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.ArrayValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 // very simple indeed
 public class SimpleDebugger implements Debugger {
     public static final Set<String> VSCODE_EMPTY = Set.of(
         "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>>${JSON.stringify([String(r),\"object\"])}`}if(typeof this==\"object\"&&this){let r;for(let i of[Symbol.for(\"debug.description\"),Symbol.for(\"nodejs.util.inspect.custom\")])try{r=this[i]();break}catch{}if(!r&&!String(this.toString).includes(\"[native code]\")&&(r=String(this)),r&&!r.startsWith(\"[object \"))return r.length>=t?r.slice(0,t)+\"\\u2026\":r}\n  ;\n\n}",
+        "function(...runtimeArgs){\n    let r = 1024; let e = null;\n    if(e)try{let t=\"<<default preview>>\",n=e.call(this,t);if(n!==t)return String(n)}catch(t){return`<<indescribable>>${JSON.stringify([String(t),\"object\"])}`}if(typeof this==\"object\"&&this){let t;for(let n of[Symbol.for(\"debug.description\"),Symbol.for(\"nodejs.util.inspect.custom\")])if(typeof this[n]==\"function\")try{t=this[n]();break}catch{}if(!t&&!String(this.toString).includes(\"[native code]\")&&(t=String(this)),t&&!t.startsWith(\"[object\"))return t.length>=r?t.slice(0,r)+\"\\u2026\":t};}",
         "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>>${JSON.stringify([String(o),n])}`;continue}if(typeof s==\"object\"&&s){let o;for(let a of runtimeArgs[0])try{o=s[a]();break}catch{}!o&&!String(s.toString).includes(\"[native code]\")&&(o=String(s)),o&&!o.startsWith(\"[object \")&&(r[n]=o.length>=t?o.slice(0,t)+\"\\u2026\":o)}}return r\n  ;\n\n}",
+        "function(...runtimeArgs){\n    let r = 1024; let e = null;\n    let t={},n=\"<<default preview>>\";if(typeof this!=\"object\"||!this)return t;for(let[i,o]of Object.entries(this)){if(e)try{let s=e.call(o,n);if(s!==n){t[i]=String(s);continue}}catch(s){t[i]=`<<indescribable>>${JSON.stringify([String(s),i])}`;continue}if(typeof o==\"object\"&&o){let s;for(let a of runtimeArgs[0])if(typeof o[a]==\"function\")try{s=o[a]();break}catch{}!s&&!String(o.toString).includes(\"[native code]\")&&(s=String(o)),s&&!s.startsWith(\"[object \")&&(t[i]=s.length>=r?s.slice(0,r)+\"\\u2026\":s)}}return t\n  ;\n\n}",
         "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}",
         "function(){return[Symbol.for(\"debug.description\"),Symbol.for(\"nodejs.util.inspect.custom\")]\n}"
     );
@@ -50,6 +54,7 @@ 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 CHROME_GET_PROP_FUNC_2 = "function invokeGetter(getter) { return Reflect.apply(getter, this, []);}";
     public static final String VSCODE_CALL = "function(t){return t.call(this)\n}";
     public static final String VSCODE_AUTOCOMPLETE = "function(t,e,r){let n=r?\"variable\":\"property\",i=(l,p,f)=>{if(p!==\"function\")return n;if(l===\"constructor\")return\"class\";let m=String(f);return m.startsWith(\"class \")||m.includes(\"[native code]\")&&/^[A-Z]/.test(l)?\"class\":r?\"function\":\"method\"\n},o=l=>{switch(typeof l){case\"number\":case\"boolean\":return`${l}`;case\"object\":return l===null?\"null\":l.constructor.name||\"object\";case\"function\":return`fn(${new Array(l.length).fill(\"?\").join(\", \")})`;default:return typeof l}},s=[],a=new Set,u=\"~\",c=t===void 0?this:t;for(;c!=null;c=c.__proto__){u+=\"~\";let l=Object.getOwnPropertyNames(c).filter(p=>p.startsWith(e)&&!p.match(/^\\d+$/));for(let p of l){if(a.has(p))continue;a.add(p);let f=Object.getOwnPropertyDescriptor(c,p),m=n,h;try{let H=c[p];m=i(p,typeof f?.value,H),h=o(H)}catch{}s.push({label:p,sortText:u+p.replace(/^_+/,H=>\"{\".repeat(H.length)),type:m,detail:h})}r=!1}return{result:s,isArray:this instanceof Array}}";
 
@@ -83,7 +88,9 @@ public class SimpleDebugger implements Debugger {
         public final String condition;
         public final Pattern pattern;
         public final int line, start;
-        public final WeakHashMap<FunctionBody, Set<Location>> resolvedLocations = new WeakHashMap<>();
+        public final long locNum;
+        public final HashMap<Filename, Location> resolvedLocations = new HashMap<>();
+        public final HashMap<Filename, Long> resolvedDistances = new HashMap<>();
 
         public Breakpoint(int id, Pattern pattern, int line, int start, String condition) {
             this.id = id;
@@ -91,18 +98,28 @@ public class SimpleDebugger implements Debugger {
             this.pattern = pattern;
             this.line = line;
             this.start = start;
+            this.locNum = start | ((long)line << 32);
 
             if (condition != null && condition.trim().equals("")) condition = null;
         }
 
         // TODO: Figure out how to unload a breakpoint
+        // TODO: Do location resolution with function boundaries
         public void addFunc(FunctionBody body, FunctionMap map) {
             try {
                 for (var loc : map.correctBreakpoint(pattern, line, start)) {
-                    if (!resolvedLocations.containsKey(body)) resolvedLocations.put(body, new HashSet<>());
+                    var currNum = loc.start() + ((long)loc.line() << 32);
-                    var set = resolvedLocations.get(body);
+                    long currDist = 0;
-                    set.add(loc);
+                    if (currNum > locNum) currDist = currNum - locNum;
+                    else currDist = locNum - currNum;
 
+                    if ( currDist > resolvedDistances.getOrDefault(loc.filename(), Long.MAX_VALUE)) continue;
+
+                    resolvedLocations.put(loc.filename(), loc);
+                    resolvedDistances.put(loc.filename(), currDist);
+                }
+
+                for (var loc : resolvedLocations.values()) {
                     ws.send(new V8Event("Debugger.breakpointResolved", new JSONMap()
                         .set("breakpointId", id)
                         .set("location", serializeLocation(loc))
@@ -133,7 +150,7 @@ public class SimpleDebugger implements Debugger {
             this.frame = frame;
             this.id = id;
 
-            this.global = frame.function.environment.global.obj;
+            this.global = GlobalScope.get(frame.ctx).obj;
             this.local = frame.getLocalScope();
             this.capture = frame.getCaptureScope();
             Values.makePrototypeChain(frame.ctx, global, capture, local);
@@ -156,19 +173,19 @@ public class SimpleDebugger implements Debugger {
                     .add(new JSONMap()
                         .set("type", "global")
                         .set("name", "Global Scope")
-                        .set("object", serializeObj(frame.ctx, global))
+                        .set("object", serializeObj(frame.ctx.extensions, global))
                     )
                     .add(new JSONMap()
                         .set("type", "other")
                         .set("name", "Value Stack")
-                        .set("object", serializeObj(frame.ctx, valstack))
+                        .set("object", serializeObj(frame.ctx.extensions, valstack))
                     )
                 );
         }
     }
     private class ObjRef {
         public final ObjectValue obj;
-        public final Context ctx;
+        public final Extensions ext;
         public final HashSet<String> heldGroups = new HashSet<>();
         public boolean held = true;
 
@@ -176,19 +193,19 @@ public class SimpleDebugger implements Debugger {
             return !held && heldGroups.size() == 0;
         }
 
-        public ObjRef(Context ctx, ObjectValue obj) {
+        public ObjRef(Extensions ext, ObjectValue obj) {
-            this.ctx = ctx;
+            this.ext = ext;
             this.obj = obj;
         }
     }
 
     private static class RunResult {
-        public final Context ctx;
+        public final Extensions ext;
         public final Object result;
         public final EngineException error;
 
-        public RunResult(Context ctx, Object result, EngineException error) {
+        public RunResult(Extensions ext, Object result, EngineException error) {
-            this.ctx = ctx;
+            this.ext = ext;
             this.result = result;
             this.error = error;
         }
@@ -202,8 +219,9 @@ public class SimpleDebugger implements Debugger {
 
     private ObjectValue emptyObject = new ObjectValue();
 
+    private WeakHashMap<DebugContext, DebugContext> contexts = new WeakHashMap<>();
     private WeakHashMap<FunctionBody, FunctionMap> mappings = new WeakHashMap<>();
-    private WeakHashMap<FunctionBody, HashMap<Location, Breakpoint>> bpLocs = new WeakHashMap<>();
+    private HashMap<Location, HashSet<Breakpoint>> bpLocs = new HashMap<>();
 
     private HashMap<Integer, Breakpoint> idToBreakpoint = new HashMap<>();
 
@@ -226,6 +244,8 @@ public class SimpleDebugger implements Debugger {
     private int stepOutPtr = 0;
 
     private boolean compare(String src, String target) {
+        src = src.replaceAll("\\s", "");
+        target = target.replaceAll("\\s", "");
         if (src.length() != target.length()) return false;
         var diff = 0;
         var all = 0;
@@ -291,13 +311,11 @@ public class SimpleDebugger implements Debugger {
         bpLocs.clear();
 
         for (var bp : idToBreakpoint.values()) {
-            for (var el : bp.resolvedLocations.entrySet()) {
+            for (var loc : bp.resolvedLocations.values()) {
-                if (!bpLocs.containsKey(el.getKey())) bpLocs.put(el.getKey(), new HashMap<>());
+                bpLocs.putIfAbsent(loc, new HashSet<>());
-                var map = bpLocs.get(el.getKey());
+                var set = bpLocs.get(loc);
 
-                for (var loc : el.getValue()) {
+                set.add(bp);
-                    map.put(loc, bp);
-                }
             }
         }
     }
@@ -321,22 +339,10 @@ public class SimpleDebugger implements Debugger {
             .set("columnNumber", loc.start() - 1);
     }
 
-    private Integer objectId(Context ctx, ObjectValue obj) {
+    private JSONMap serializeObj(Extensions env, Object val, boolean byValue) {
-        if (objectToId.containsKey(obj)) return objectToId.get(obj);
-        else {
-            int id = nextId();
-            var ref = new ObjRef(ctx, obj);
-            objectToId.put(obj, id);
-            idToObject.put(id, ref);
-            return id;
-        }
-    }
-    private JSONMap serializeObj(Context ctx, Object val, boolean byValue) {
         val = Values.normalize(null, val);
-        var newCtx = new Context();
+        env = sanitizeEnvironment(env);
-        newCtx.addAll(ctx);
+        var ctx = Context.of(env);
-        newCtx.add(DebugContext.IGNORE);
-        ctx = newCtx;
 
         if (val == Values.NULL) {
             return new JSONMap()
@@ -348,7 +354,16 @@ public class SimpleDebugger implements Debugger {
 
         if (val instanceof ObjectValue) {
             var obj = (ObjectValue)val;
-            var id = objectId(ctx, obj);
+            int id;
+
+            if (objectToId.containsKey(obj)) id = objectToId.get(obj);
+            else {
+                id = nextId();
+                var ref = new ObjRef(env, obj);
+                objectToId.put(obj, id);
+                idToObject.put(id, ref);
+            }
+
             var type = "object";
             String subtype = null;
             String className = null;
@@ -366,6 +381,7 @@ public class SimpleDebugger implements Debugger {
             if (subtype != null) res.set("subtype", subtype);
             if (className != null) {
                 res.set("className", className);
+                res.set("description", className);
             }
 
             if (obj instanceof ArrayValue) res.set("description", "Array(" + ((ArrayValue)obj).size() + ")");
@@ -376,16 +392,16 @@ public class SimpleDebugger implements Debugger {
                 try {
                     defaultToString =
                         Values.getMember(ctx, obj, "toString") ==
-                        Values.getMember(ctx, ctx.get(Environment.OBJECT_PROTO), "toString");
+                        Values.getMember(ctx, env.get(Environment.OBJECT_PROTO), "toString");
                 }
                 catch (Exception e) { }
 
                 try { res.set("description", className + (defaultToString ? "" : " { " + Values.toString(ctx, obj) + " }")); }
-                catch (EngineException e) { res.set("description", className); }
+                catch (EngineException e) {  }
             }
 
 
-            if (byValue) try { res.put("value", JSON.fromJs(ctx, obj)); }
+            if (byValue) try { res.put("value", JSON.fromJs(env, obj)); }
             catch (Exception e) { }
 
             return res;
@@ -411,8 +427,8 @@ public class SimpleDebugger implements Debugger {
 
         throw new IllegalArgumentException("Unexpected JS object.");
     }
-    private JSONMap serializeObj(Context ctx, Object val) {
+    private JSONMap serializeObj(Extensions ext, Object val) {
-        return serializeObj(ctx, val, false);
+        return serializeObj(ext, val, false);
     }
     private void addObjectGroup(String name, Object val) {
         if (val instanceof ObjectValue) {
@@ -451,11 +467,11 @@ public class SimpleDebugger implements Debugger {
         else return JSON.toJs(res);
     }
 
-    private JSONMap serializeException(Context ctx, EngineException err) {
+    private JSONMap serializeException(Extensions ext, EngineException err) {
         String text = null;
 
         try {
-            text = Values.toString(ctx, err.value);
+            text = Values.toString(Context.of(ext), err.value);
         }
         catch (EngineException e) {
             text = "[error while stringifying]";
@@ -463,7 +479,7 @@ public class SimpleDebugger implements Debugger {
 
         var res = new JSONMap()
             .set("exceptionId", nextId())
-            .set("exception", serializeObj(ctx, err.value))
+            .set("exception", serializeObj(ext, err.value))
             .set("text", text);
 
         return res;
@@ -524,30 +540,43 @@ public class SimpleDebugger implements Debugger {
         }
     }
 
+    private Extensions sanitizeEnvironment(Extensions ext) {
+        var res = ext.child();
+
+        res.remove(EventLoop.KEY);
+        res.remove(DebugContext.KEY);
+        res.add(DebugContext.IGNORE);
+
+        return res;
+    }
+
     private RunResult run(DebugFrame codeFrame, String code) {
         if (codeFrame == null) return new RunResult(null, code, new EngineException("Invalid code frame!"));
         var engine = new Engine();
-        var env = codeFrame.frame.function.environment.copy();
+        var env = codeFrame.frame.ctx.extensions.copy();
 
-        env.global = new GlobalScope(codeFrame.local);
-        env.remove(EventLoop.KEY);
         env.remove(DebugContext.KEY);
+        env.remove(EventLoop.KEY);
+        env.remove(GlobalScope.KEY);
         env.add(EventLoop.KEY, engine);
+        env.add(GlobalScope.KEY, new GlobalScope(codeFrame.local));
 
-        var ctx = new Context(env);
+        var awaiter = engine.pushMsg(false, env, new Filename("jscript", "eval"), code, codeFrame.frame.thisArg, codeFrame.frame.args);
-        var awaiter = engine.pushMsg(false, ctx.environment, new Filename("jscript", "eval"), code, codeFrame.frame.thisArg, codeFrame.frame.args);
 
-        engine.run(true);
+        try {
-
+            engine.run(true);
-        try { return new RunResult(ctx, awaiter.await(), null); }
+            return new RunResult(env, awaiter.await(), null);
-        catch (EngineException e) { return new RunResult(ctx, null, e); }
+        }
+        catch (EngineException e) { return new RunResult(env, null, e); }
+        catch (SyntaxException e) { return new RunResult(env, null, EngineException.ofSyntax(e.toString())); }
     }
 
-    private ObjectValue vscodeAutoSuggest(Context ctx, Object target, String query, boolean variable) {
+    private ObjectValue vscodeAutoSuggest(Extensions ext, Object target, String query, boolean variable) {
         var res = new ArrayValue();
         var passed = new HashSet<String>();
         var tildas = "~";
-        if (target == null) target = ctx.environment.global;
+        var ctx = Context.of(ext);
+        if (target == null) target = GlobalScope.get(ext);
 
         for (var proto = target; proto != null && proto != Values.NULL; proto = Values.getPrototype(ctx, proto)) {
             for (var el : Values.getMembers(ctx, proto, true, true)) {
@@ -602,7 +631,7 @@ public class SimpleDebugger implements Debugger {
                         desc.defineProperty(ctx, "type", Values.type(val));
                         break;
                 }
-            
+
                 res.set(ctx, res.size(), desc);
             }
 
@@ -630,15 +659,18 @@ public class SimpleDebugger implements Debugger {
         ws.send(msg.respond());
     }
     @Override public synchronized void close() {
+        if (state != State.RESUMED) {
+            resume(State.RESUMED);
+        }
+
         enabled = false;
         execptionType = CatchType.NONE;
         state = State.RESUMED;
 
-        // idToBptCand.clear();
+        mappings.clear();
+        bpLocs.clear();
 
         idToBreakpoint.clear();
-        // locToBreakpoint.clear();
-        // tmpBreakpts.clear();
 
         filenameToId.clear();
         idToSource.clear();
@@ -656,6 +688,9 @@ public class SimpleDebugger implements Debugger {
         stepOutFrame = currFrame = null;
         stepOutPtr = 0;
 
+        for (var ctx : contexts.keySet()) ctx.detachDebugger(this);
+        contexts.clear();
+
         updateNotifier.next();
     }
 
@@ -709,16 +744,15 @@ public class SimpleDebugger implements Debugger {
         var bpt = new Breakpoint(nextId(), regex, line, col, cond);
         idToBreakpoint.put(bpt.id, bpt);
 
-        var locs = new JSONList();
 
         for (var el : mappings.entrySet()) {
             bpt.addFunc(el.getKey(), el.getValue());
         }
 
-        for (var el : bpt.resolvedLocations.values()) {
+        var locs = new JSONList();
-            for (var loc : el) {
+
-                locs.add(serializeLocation(loc));
+        for (var loc : bpt.resolvedLocations.values()) {
-            }
+            locs.add(serializeLocation(loc));
         }
 
         ws.send(msg.respond(new JSONMap()
@@ -730,6 +764,7 @@ public class SimpleDebugger implements Debugger {
         var id = Integer.parseInt(msg.params.string("breakpointId"));
 
         idToBreakpoint.remove(id);
+        updateBreakpoints();
         ws.send(msg.respond());
     }
     @Override public synchronized void continueToLocation(V8Message msg) throws IOException {
@@ -794,8 +829,8 @@ public class SimpleDebugger implements Debugger {
 
         if (group != null) addObjectGroup(group, res.result);
 
-        if (res.error != null) ws.send(msg.respond(new JSONMap().set("exceptionDetails", serializeException(res.ctx, res.error))));
+        if (res.error != null) ws.send(msg.respond(new JSONMap().set("exceptionDetails", serializeException(res.ext, res.error))));
-        else ws.send(msg.respond(new JSONMap().set("result", serializeObj(res.ctx, res.result))));
+        else ws.send(msg.respond(new JSONMap().set("result", serializeObj(res.ext, res.result))));
     }
 
     @Override public synchronized void releaseObjectGroup(V8Message msg) throws IOException {
@@ -818,46 +853,54 @@ public class SimpleDebugger implements Debugger {
     @Override public synchronized void getProperties(V8Message msg) throws IOException {
         var ref = idToObject.get(Integer.parseInt(msg.params.string("objectId")));
         var obj = ref.obj;
-
+        var ext = ref.ext;
+        var ctx = Context.of(ext);
         var res = new JSONList();
-        var ctx = ref.ctx;
+        var own = true;
 
         if (obj != emptyObject && obj != null) {
-            for (var key : obj.keys(true)) {
+            while (obj != null) {
-                var propDesc = new JSONMap();
+                for (var key : obj.keys(true)) {
+                    var propDesc = new JSONMap();
 
-                if (obj.properties.containsKey(key)) {
+                    if (obj.properties.containsKey(key)) {
-                    var prop = obj.properties.get(key);
+                        var prop = obj.properties.get(key);
 
-                    propDesc.set("name", Values.toString(ctx, key));
+                        propDesc.set("name", Values.toString(ctx, key));
-                    if (prop.getter != null) propDesc.set("get", serializeObj(ctx, prop.getter));
+                        if (prop.getter != null) propDesc.set("get", serializeObj(ext, prop.getter));
-                    if (prop.setter != null) propDesc.set("set", serializeObj(ctx, prop.setter));
+                        if (prop.setter != null) propDesc.set("set", serializeObj(ext, prop.setter));
-                    propDesc.set("enumerable", obj.memberEnumerable(key));
+                        propDesc.set("enumerable", obj.memberEnumerable(key));
-                    propDesc.set("configurable", obj.memberConfigurable(key));
+                        propDesc.set("configurable", obj.memberConfigurable(key));
-                    propDesc.set("isOwn", true);
+                        propDesc.set("isOwn", true);
-                    res.add(propDesc);
+                        res.add(propDesc);
+                    }
+                    else {
+                        propDesc.set("name", Values.toString(ctx, key));
+                        propDesc.set("value", serializeObj(ext, Values.getMember(ctx, obj, key)));
+                        propDesc.set("writable", obj.memberWritable(key));
+                        propDesc.set("enumerable", obj.memberEnumerable(key));
+                        propDesc.set("configurable", obj.memberConfigurable(key));
+                        propDesc.set("isOwn", own);
+                        res.add(propDesc);
+                    }
                 }
-                else {
+
-                    propDesc.set("name", Values.toString(ctx, key));
+                var proto = Values.getPrototype(ctx, obj);
-                    propDesc.set("value", serializeObj(ctx, Values.getMember(ctx, obj, key)));
+
-                    propDesc.set("writable", obj.memberWritable(key));
+                if (own) {
-                    propDesc.set("enumerable", obj.memberEnumerable(key));
+                    var protoDesc = new JSONMap();
-                    propDesc.set("configurable", obj.memberConfigurable(key));
+                    protoDesc.set("name", "__proto__");
-                    propDesc.set("isOwn", true);
+                    protoDesc.set("value", serializeObj(ext, proto == null ? Values.NULL : proto));
-                    res.add(propDesc);
+                    protoDesc.set("writable", true);
+                    protoDesc.set("enumerable", false);
+                    protoDesc.set("configurable", false);
+                    protoDesc.set("isOwn", own);
+                    res.add(protoDesc);
                 }
+
+                obj = proto;
+                own = false;
             }
-    
-            var proto = Values.getPrototype(ctx, obj);
-    
-            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)));
@@ -874,7 +917,8 @@ public class SimpleDebugger implements Debugger {
 
         var thisArgRef = idToObject.get(Integer.parseInt(msg.params.string("objectId")));
         var thisArg = thisArgRef.obj;
-        var ctx = thisArgRef.ctx;
+        var ext = thisArgRef.ext;
+        var ctx = Context.of(ext);
 
         while (true) {
             var start = src.lastIndexOf("//# sourceURL=");
@@ -892,22 +936,25 @@ public class SimpleDebugger implements Debugger {
                 res = thisArg;
                 for (var el : JSON.parse(null, (String)args.get(0)).list()) res = Values.getMember(ctx, res, JSON.toJs(el));
             }
+            else if (compare(src, CHROME_GET_PROP_FUNC_2)) {
+                res = Values.call(ctx, args.get(0), thisArg);
+            }
             else if (compare(src, 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)))));
+                ws.send(msg.respond(new JSONMap().set("result", serializeObj(ext, func.call(ctx, thisArg)))));
             }
             else if (compare(src, VSCODE_AUTOCOMPLETE)) {
                 var target = args.get(0);
                 if (target == null) target = thisArg;
-                res = vscodeAutoSuggest(ctx, target, Values.toString(ctx, args.get(1)), Values.toBoolean(args.get(2)));
+                res = vscodeAutoSuggest(ext, target, Values.toString(ctx, args.get(1)), Values.toBoolean(args.get(2)));
             }
             else {
                 ws.send(new V8Error("Please use well-known functions with callFunctionOn"));
                 return;
             }
-            ws.send(msg.respond(new JSONMap().set("result", serializeObj(ctx, res, byValue))));
+            ws.send(msg.respond(new JSONMap().set("result", serializeObj(ext, res, byValue))));
         }
-        catch (EngineException e) { ws.send(msg.respond(new JSONMap().set("exceptionDetails", serializeException(ctx, e)))); }
+        catch (EngineException e) { ws.send(msg.respond(new JSONMap().set("exceptionDetails", serializeException(ext, e)))); }
     }
 
     @Override public synchronized void runtimeEnable(V8Message msg) throws IOException {
@@ -958,10 +1005,11 @@ public class SimpleDebugger implements Debugger {
             ) {
                 pauseDebug(ctx, null);
             }
-            else if (isBreakpointable && bpLocs.getOrDefault(cf.function.body, new HashMap<>()).containsKey(loc)) {
+            else if (isBreakpointable && bpLocs.containsKey(loc)) {
-                var bp = bpLocs.get(cf.function.body).get(loc);
+                for (var bp : bpLocs.get(loc)) {
-                var ok = bp.condition == null ? true : Values.toBoolean(run(currFrame, bp.condition).result);
+                    var ok = bp.condition == null ? true : Values.toBoolean(run(currFrame, bp.condition).result);
-                if (ok) pauseDebug(ctx, bp);
+                    if (ok) pauseDebug(ctx, bp);
+                }
             }
             // else if (isBreakpointable && tmpBreakpts.remove(loc)) pauseDebug(ctx, null);
             else if (isBreakpointable && pendingPause) {
@@ -1033,6 +1081,7 @@ public class SimpleDebugger implements Debugger {
 
     public SimpleDebugger attach(DebugContext ctx) {
         ctx.attachDebugger(this);
+        contexts.put(ctx, ctx);
         return this;
     }
 

src/java/me/topchetoeu/jscript/utils/filesystem/BaseFile.java

@@ -13,7 +13,7 @@ public abstract class BaseFile<T> implements File {
     protected abstract long onSeek(long offset, int pos);
     protected abstract boolean onClose();
 
-    @Override public int read(byte[] buff) {
+    @Override public synchronized int read(byte[] buff) {
         try {
             if (handle == null) throw new FilesystemException(ErrorReason.CLOSED);
             if (!mode.readable) throw new FilesystemException(ErrorReason.NO_PERMISSION, "File not open for reading.");
@@ -21,7 +21,7 @@ public abstract class BaseFile<T> implements File {
         }
         catch (FilesystemException e) { throw e.setAction(ActionType.READ); }
     }
-    @Override public void write(byte[] buff) {
+    @Override public synchronized void write(byte[] buff) {
         try {
             if (handle == null) throw new FilesystemException(ErrorReason.CLOSED);
             if (!mode.writable) throw new FilesystemException(ErrorReason.NO_PERMISSION, "File not open for writting.");
@@ -29,7 +29,7 @@ public abstract class BaseFile<T> implements File {
         }
         catch (FilesystemException e) { throw e.setAction(ActionType.WRITE); }
     }
-    @Override public long seek(long offset, int pos) {
+    @Override public synchronized long seek(long offset, int pos) {
         try {
             if (handle == null) throw new FilesystemException(ErrorReason.CLOSED);
             if (!mode.writable) throw new FilesystemException(ErrorReason.NO_PERMISSION, "File not open for seeking.");
@@ -37,7 +37,7 @@ public abstract class BaseFile<T> implements File {
         }
         catch (FilesystemException e) { throw e.setAction(ActionType.SEEK); }
     }
-    @Override public boolean close() {
+    @Override public synchronized boolean close() {
         if (handle != null) {
             try {
                 var res = onClose();

src/java/me/topchetoeu/jscript/utils/filesystem/File.java

@@ -66,7 +66,7 @@ public interface File {
 
     public static File ofStream(InputStream str) {
         return new File() {
-            @Override public int read(byte[] buff) {
+            @Override public synchronized int read(byte[] buff) {
                 try {
                     try { return str.read(buff); }
                     catch (NullPointerException e) { throw new FilesystemException(ErrorReason.ILLEGAL_ARGS, e.getMessage()); }
@@ -78,7 +78,7 @@ public interface File {
     }
     public static File ofStream(OutputStream str) {
         return new File() {
-            @Override public void write(byte[] buff) {
+            @Override public synchronized void write(byte[] buff) {
                 try {
                     try { str.write(buff); }
                     catch (NullPointerException e) {throw new FilesystemException(ErrorReason.ILLEGAL_ARGS, e.getMessage()); }
@@ -91,7 +91,7 @@ public interface File {
     public static File ofLineWriter(LineWriter writer) {
         var buff = new Buffer();
         return new File() {
-            @Override public void write(byte[] val) {
+            @Override public synchronized void write(byte[] val) {
                 try {
                     if (val == null) throw new FilesystemException(ErrorReason.ILLEGAL_ARGS, "Given buffer is null.");
     
@@ -99,6 +99,7 @@ public interface File {
                         if (b == '\n') {
                             try {
                                 writer.writeLine(new String(buff.data()));
+                                buff.clear();
                             }
                             catch (IOException e) {
                                 throw new FilesystemException(ErrorReason.UNKNOWN, e.getMessage());
@@ -117,7 +118,7 @@ public interface File {
             private byte[] prev = new byte[0];
 
             @Override
-            public int read(byte[] buff) {
+            public synchronized int read(byte[] buff) {
                 try {
                     if (buff == null) throw new FilesystemException(ErrorReason.ILLEGAL_ARGS, "Given buffer is null.");
                     var ptr = 0;

src/java/me/topchetoeu/jscript/utils/filesystem/Filesystem.java

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.utils.filesystem;
 
-import me.topchetoeu.jscript.core.Extensions;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.Key;
+import me.topchetoeu.jscript.runtime.Key;
 
 public interface Filesystem {
     public static final Key<Filesystem> KEY = new Key<>();

src/java/me/topchetoeu/jscript/utils/filesystem/FilesystemException.java

@@ -2,8 +2,8 @@ package me.topchetoeu.jscript.utils.filesystem;
 
 import java.util.ArrayList;
 
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.Values;
 
 public class FilesystemException extends RuntimeException {
     public final ErrorReason reason;

src/java/me/topchetoeu/jscript/utils/filesystem/MemoryFilesystem.java

@@ -20,7 +20,7 @@ public class MemoryFilesystem implements Filesystem {
     @Override public String normalize(String... path) {
         return Paths.normalize(path);
     }
-    @Override public File open(String _path, Mode perms) {
+    @Override public synchronized File open(String _path, Mode perms) {
         try {
             var path = realPath(_path);
             var pcount = path.getNameCount();
@@ -47,7 +47,7 @@ public class MemoryFilesystem implements Filesystem {
         }
         catch (FilesystemException e) { throw e.setPath(_path).setAction(ActionType.OPEN); }
     }
-    @Override public boolean create(String _path, EntryType type) {
+    @Override public synchronized boolean create(String _path, EntryType type) {
         try {
             var path = realPath(_path);
     
@@ -69,14 +69,14 @@ public class MemoryFilesystem implements Filesystem {
         }
         catch (FilesystemException e) { throw e.setPath(_path).setAction(ActionType.CREATE); }
     }
-    @Override public FileStat stat(String _path) {
+    @Override public synchronized FileStat stat(String _path) {
         var path = realPath(_path);
 
         if (files.containsKey(path)) return new FileStat(mode, EntryType.FILE);
         else if (folders.contains(path)) return new FileStat(mode, EntryType.FOLDER);
         else return new FileStat(Mode.NONE, EntryType.NONE);
     }
-    @Override public void close() throws FilesystemException {
+    @Override public synchronized void close() throws FilesystemException {
         handles.close();
     }
 

src/java/me/topchetoeu/jscript/utils/filesystem/PhysicalFilesystem.java

@@ -24,7 +24,7 @@ public class PhysicalFilesystem implements Filesystem {
     @Override public String normalize(String... paths) {
         return Paths.normalize(paths);
     }
-    @Override public File open(String _path, Mode perms) {
+    @Override public synchronized File open(String _path, Mode perms) {
         try {
             var path = realPath(normalize(_path));
             checkMode(path, perms);
@@ -39,7 +39,7 @@ public class PhysicalFilesystem implements Filesystem {
         }
         catch (FilesystemException e) { throw e.setAction(ActionType.OPEN).setPath(_path); }
     }
-    @Override public boolean create(String _path, EntryType type) {
+    @Override public synchronized boolean create(String _path, EntryType type) {
         try {
             var path = realPath(_path);
 
@@ -63,7 +63,7 @@ public class PhysicalFilesystem implements Filesystem {
 
         return true;
     }
-    @Override public FileStat stat(String _path) {
+    @Override public synchronized FileStat stat(String _path) {
         var path = realPath(_path);
 
         if (!Files.exists(path)) return new FileStat(Mode.NONE, EntryType.NONE);
@@ -82,7 +82,7 @@ public class PhysicalFilesystem implements Filesystem {
             Files.isDirectory(path) ? EntryType.FOLDER : EntryType.FILE
         );
     }
-    @Override public void close() throws FilesystemException {
+    @Override public synchronized void close() throws FilesystemException {
         try {
             handles.close();
         }

src/java/me/topchetoeu/jscript/utils/filesystem/RootFilesystem.java

@@ -5,17 +5,21 @@ import java.util.Map;
 
 import me.topchetoeu.jscript.common.Filename;
 import me.topchetoeu.jscript.utils.permissions.Matcher;
+import me.topchetoeu.jscript.utils.permissions.Permission;
 import me.topchetoeu.jscript.utils.permissions.PermissionsProvider;
 
 public class RootFilesystem implements Filesystem {
     public final Map<String, Filesystem> protocols = new HashMap<>();
     public final PermissionsProvider perms;
 
+    public static final Permission PERM_READ = new Permission("jscript.file.read", Matcher.fileWildcard());
+    public static final Permission PERM_WRITE = new Permission("jscript.file.read", Matcher.fileWildcard());
+
     private boolean canRead(String _path) {
-        return perms.hasPermission("jscript.file.read:" + _path, Matcher.fileWildcard());
+        return perms.hasPermission(PERM_READ, _path);
     }
     private boolean canWrite(String _path) {
-        return perms.hasPermission("jscript.file.write:" + _path, Matcher.fileWildcard());
+        return perms.hasPermission(PERM_WRITE, _path);
     }
 
     private void modeAllowed(String _path, Mode mode) throws FilesystemException {
@@ -49,7 +53,7 @@ public class RootFilesystem implements Filesystem {
             else return filename.protocol + "://" + protocol.normalize(paths);
         }
     }
-    @Override public File open(String path, Mode perms) throws FilesystemException {
+    @Override public synchronized File open(String path, Mode perms) throws FilesystemException {
         try {
             var filename = Filename.parse(path);
             var protocol = getProtocol(filename);
@@ -59,7 +63,7 @@ public class RootFilesystem implements Filesystem {
         }
         catch (FilesystemException e) { throw e.setPath(path).setAction(ActionType.OPEN); }
     }
-    @Override public boolean create(String path, EntryType type) throws FilesystemException {
+    @Override public synchronized boolean create(String path, EntryType type) throws FilesystemException {
         try {
             var filename = Filename.parse(path);
             var protocol = getProtocol(filename);
@@ -69,7 +73,7 @@ public class RootFilesystem implements Filesystem {
         }
         catch (FilesystemException e) { throw e.setPath(path).setAction(ActionType.CREATE); }
     }
-    @Override public FileStat stat(String path) throws FilesystemException {
+    @Override public synchronized FileStat stat(String path) throws FilesystemException {
         try {
             var filename = Filename.parse(path);
             var protocol = getProtocol(filename);
@@ -78,7 +82,7 @@ public class RootFilesystem implements Filesystem {
         }
         catch (FilesystemException e) { throw e.setPath(path).setAction(ActionType.STAT); }
     }
-    @Override public void close() throws FilesystemException {
+    @Override public synchronized void close() throws FilesystemException {
         try {
             for (var protocol : protocols.values()) {
                 protocol.close();

src/java/me/topchetoeu/jscript/utils/filesystem/STDFilesystem.java

@@ -2,41 +2,51 @@ package me.topchetoeu.jscript.utils.filesystem;
 
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.HashMap;
 
 public class STDFilesystem implements Filesystem {
-    private final HashMap<String, File> handles = new HashMap<>();
+    private File in;
+    private File out;
+    private File err;
 
     @Override
     public String normalize(String... path) {
         var res = Paths.normalize(path);
         while (res.startsWith("/")) res = res.substring(1);
+        while (res.endsWith("/")) res = res.substring(0, res.length() - 1);
         return res;
     }
 
-    @Override public File open(String path, Mode mode) {
+    @Override public synchronized File open(String path, Mode mode) {
         path = normalize(path);
-        if (handles.containsKey(path)) return handles.get(path);
+        if (in != null && path.equals("in")) return in;
+        else if (out != null && path.equals("out")) return out;
+        else if (err != null && path.equals("err")) return err;
         else throw new FilesystemException(ErrorReason.DOESNT_EXIST).setAction(ActionType.OPEN).setPath(path);
     }
-    @Override public FileStat stat(String path) {
+    @Override public synchronized FileStat stat(String path) {
         path = normalize(path);
-        if (handles.containsKey(path)) return new FileStat(Mode.READ_WRITE, EntryType.FILE);
+        if (path.equals("in") || path.equals("out") || path.equals("err")) return new FileStat(Mode.READ_WRITE, EntryType.FILE);
         else return new FileStat(Mode.NONE, EntryType.NONE);
     }
-    @Override public void close() {
+    @Override public synchronized void close() {
-        handles.clear();
+        in = out = err = null;
     }
 
-    public STDFilesystem add(String name, File handle) {
+    public STDFilesystem(File in, File out, File err) {
-        this.handles.put(name, handle);
+        this.in = in;
-        return this;
+        this.out = out;
+        this.err = err;
     }
-
+    public STDFilesystem(InputStream in, OutputStream out, OutputStream err) {
-    public static STDFilesystem ofStd(InputStream in, OutputStream out, OutputStream err) {
+        if (in != null) this.in = File.ofStream(in);
-        return new STDFilesystem()
+        if (out != null) this.out = File.ofStream(out);
-            .add("in", File.ofStream(in))
+        if (err != null) this.err = File.ofStream(err);
-            .add("out", File.ofStream(out))
+    }
-            .add("err", File.ofStream(err));
+    public STDFilesystem(LineReader in, LineWriter out) {
+        if (in != null) this.in = File.ofLineReader(in);
+        if (out != null) {
+            this.out = File.ofLineWriter(out);
+            this.err = File.ofLineWriter(out);
+        }
     }
 }

src/java/me/topchetoeu/jscript/utils/interop/Arguments.java

@@ -2,15 +2,33 @@ package me.topchetoeu.jscript.utils.interop;
 
 import java.lang.reflect.Array;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.values.NativeWrapper;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.Key;
+import me.topchetoeu.jscript.runtime.values.NativeWrapper;
+import me.topchetoeu.jscript.runtime.values.Values;
 
-public class Arguments {
+public class Arguments implements Extensions {
     public final Object self;
     public final Object[] args;
     public final Context ctx;
 
+    @Override public <T> void add(Key<T> key, T obj) {
+        ctx.add(key, obj);
+    }
+    @Override public <T> T get(Key<T> key) {
+        return ctx.get(key);
+    }
+    @Override public boolean has(Key<?> key) {
+        return ctx.has(key);
+    }
+    @Override public boolean remove(Key<?> key) {
+        return ctx.remove(key);
+    }
+    @Override public Iterable<Key<?>> keys() {
+        return ctx.keys();
+    }
+
     public int n() {
         return args.length;
     }

src/java/me/topchetoeu/jscript/utils/interop/ExposeType.java

@@ -1,7 +1,6 @@
 package me.topchetoeu.jscript.utils.interop;
 
 public enum ExposeType {
-    INIT,
     METHOD,
     GETTER,
     SETTER,

src/java/me/topchetoeu/jscript/utils/interop/NativeWrapperProvider.java

@@ -10,22 +10,27 @@ import java.util.HashSet;
 import java.util.stream.Collectors;
 
 import me.topchetoeu.jscript.common.Location;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Copyable;
-import me.topchetoeu.jscript.core.WrapperProvider;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.runtime.Key;
-import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
-import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
-import me.topchetoeu.jscript.core.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.FunctionValue;
-import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.runtime.values.NativeFunction;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.values.ObjectValue;
-import me.topchetoeu.jscript.core.exceptions.InterruptException;
+import me.topchetoeu.jscript.runtime.values.Symbol;
+import me.topchetoeu.jscript.runtime.values.Values;
+
+public class NativeWrapperProvider implements Copyable {
+    public static final Key<NativeWrapperProvider> KEY = new Key<>();
 
-public class NativeWrapperProvider implements WrapperProvider {
     private final HashMap<Class<?>, FunctionValue> constructors = new HashMap<>();
     private final HashMap<Class<?>, ObjectValue> prototypes = new HashMap<>();
     private final HashMap<Class<?>, ObjectValue> namespaces = new HashMap<>();
-    private final Environment env;
+    private final HashMap<Class<?>, Class<?>> classToProxy = new HashMap<>();
+    private final HashMap<Class<?>, Class<?>> proxyToClass = new HashMap<>();
+    private final HashSet<Class<?>> ignore = new HashSet<>();
 
     private static Object call(Context ctx, String name, Method method, Object thisArg, Object... args) {
         try {
@@ -106,11 +111,12 @@ public class NativeWrapperProvider implements WrapperProvider {
         else return name;
     }
 
-    private static void apply(ObjectValue obj, Environment env, ExposeTarget target, Class<?> clazz) {
+    private static boolean apply(ObjectValue obj, ExposeTarget target, Class<?> clazz) {
         var getters = new HashMap<Object, FunctionValue>();
         var setters = new HashMap<Object, FunctionValue>();
         var props = new HashSet<Object>();
         var nonProps = new HashSet<Object>();
+        var any = false;
 
         for (var method : clazz.getDeclaredMethods()) {
             for (var annotation : method.getAnnotationsByType(Expose.class)) {
@@ -120,15 +126,9 @@ public class NativeWrapperProvider implements WrapperProvider {
                 var name = getName(method, annotation.value());
                 var key = getKey(name);
                 var repeat = false;
+                any = true;
 
                 switch (annotation.type()) {
-                    case INIT:
-                        checkSignature(method, true,
-                            target == ExposeTarget.CONSTRUCTOR ? FunctionValue.class : ObjectValue.class,
-                            Environment.class
-                        );
-                        call(null, null, method, obj, null, env);
-                        break;
                     case METHOD:
                         if (props.contains(key) || nonProps.contains(key)) repeat = true;
                         else {
@@ -168,11 +168,17 @@ public class NativeWrapperProvider implements WrapperProvider {
                 var name = getName(method, annotation.value());
                 var key = getKey(name);
                 var repeat = false;
+                any = true;
 
                 if (props.contains(key) || nonProps.contains(key)) repeat = true;
                 else {
-                    checkSignature(method, true, Environment.class);
+                    checkSignature(method, true);
-                    obj.defineProperty(null, key, call(new Context(env), name, method, null, env), true, true, false);
+                    try {
+                        obj.defineProperty(null, key, method.invoke(null), true, true, false);
+                    }
+                    catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
+                        throw new RuntimeException(e);
+                    }
                     nonProps.add(key);
                 }
 
@@ -191,11 +197,29 @@ public class NativeWrapperProvider implements WrapperProvider {
                 var name = getName(field, annotation.value());
                 var key = getKey(name);
                 var repeat = false;
+                any = true;
 
                 if (props.contains(key) || nonProps.contains(key)) repeat = true;
                 else {
                     try {
-                        obj.defineProperty(null, key, Values.normalize(new Context(env), field.get(null)), true, true, false);
+                        if (Modifier.isStatic(field.getModifiers())) {
+                            obj.defineProperty(null, key, Values.normalize(null, field.get(null)), true, true, false);
+                        }
+                        else {
+                            obj.defineProperty(
+                                null, key,
+                                new NativeFunction("get " + key, args -> {
+                                    try { return field.get(args.self(clazz)); }
+                                    catch (IllegalAccessException e) { e.printStackTrace(); return null; }
+                                }),
+                                Modifier.isFinal(field.getModifiers()) ? null : new NativeFunction("get " + key, args -> {
+                                    try { field.set(args.self(clazz), args.convert(0, field.getType())); }
+                                    catch (IllegalAccessException e) { e.printStackTrace(); }
+                                    return null;
+                                }),
+                                true, false
+                            );
+                        }
                         nonProps.add(key);
                     }
                     catch (IllegalArgumentException | IllegalAccessException e) { }
@@ -210,9 +234,11 @@ public class NativeWrapperProvider implements WrapperProvider {
         }
 
         for (var key : props) obj.defineProperty(null, key, getters.get(key), setters.get(key), true, false);
+
+        return any;
     }
 
-    private static Method getConstructor(Environment env, Class<?> clazz) {
+    private static Method getConstructor(Class<?> clazz) {
         for (var method : clazz.getDeclaredMethods()) {
             if (!method.isAnnotationPresent(ExposeConstructor.class)) continue;
             checkSignature(method, true, Arguments.class);
@@ -228,10 +254,10 @@ public class NativeWrapperProvider implements WrapperProvider {
      * All accessors and methods will expect the this argument to be a native wrapper of the given class type.
      * @param clazz The class for which a prototype should be generated
      */
-    public static ObjectValue makeProto(Environment env, Class<?> clazz) {
+    public static ObjectValue makeProto(Class<?> clazz) {
         var res = new ObjectValue();
         res.defineProperty(null, Symbol.get("Symbol.typeName"), getName(clazz));
-        apply(res, env, ExposeTarget.PROTOTYPE, clazz);
+        if (!apply(res, ExposeTarget.PROTOTYPE, clazz)) return null;
         return res;
     }
     /**
@@ -240,14 +266,14 @@ public class NativeWrapperProvider implements WrapperProvider {
      * When the function gets called, the underlying constructor will get called, unless the constructor is inaccessible.
      * @param clazz The class for which a constructor should be generated
      */
-    public static FunctionValue makeConstructor(Environment ctx, Class<?> clazz) {
+    public static FunctionValue makeConstructor(Class<?> clazz) {
-        var constr = getConstructor(ctx, clazz);
+        var constr = getConstructor(clazz);
 
         FunctionValue res = constr == null ?
             new NativeFunction(getName(clazz), args -> { throw EngineException.ofError("This constructor is not invokable."); }) :
             create(getName(clazz), constr);
 
-        apply(res, ctx, ExposeTarget.CONSTRUCTOR, clazz);
+        apply(res, ExposeTarget.CONSTRUCTOR, clazz);
 
         return res;
     }
@@ -257,15 +283,34 @@ public class NativeWrapperProvider implements WrapperProvider {
      * This method behaves almost like {@link NativeWrapperProvider#makeConstructor}, but will return an object instead.
      * @param clazz The class for which a constructor should be generated
      */
-    public static ObjectValue makeNamespace(Environment ctx, Class<?> clazz) {
+    public static ObjectValue makeNamespace(Class<?> clazz) {
         var res = new ObjectValue();
         res.defineProperty(null, Symbol.get("Symbol.typeName"), getName(clazz));
-        apply(res, ctx, ExposeTarget.NAMESPACE, clazz);
+        if (!apply(res, ExposeTarget.NAMESPACE, clazz)) return null;
         return res;
     }
 
+    private void updateProtoChain(Class<?> clazz, ObjectValue proto, FunctionValue constr) {
+        var parent = clazz;
+
+        while (true) {
+            parent = parent.getSuperclass();
+            if (parent == null) break;
+
+            var parentProto = getProto(parent);
+            var parentConstr = getConstr(parent);
+
+            if (parentProto != null && parentConstr != null) {
+                Values.setPrototype(Extensions.EMPTY, proto, parentProto);
+                Values.setPrototype(Extensions.EMPTY, constr, parentConstr);
+
+                return;
+            }
+        }
+    }
+
     private void initType(Class<?> clazz, FunctionValue constr, ObjectValue proto) {
-        if (constr != null && proto != null) return;
+        if (constr != null && proto != null || ignore.contains(clazz)) return;
         // i vomit
         if (
             clazz == Object.class ||
@@ -281,8 +326,10 @@ public class NativeWrapperProvider implements WrapperProvider {
             clazz.isSynthetic()
         ) return;
 
-        if (constr == null) constr = makeConstructor(env, clazz);
+        if (constr == null) constr = makeConstructor(clazz);
-        if (proto == null) proto = makeProto(env, clazz);
+        if (proto == null) proto = makeProto(clazz);
+
+        if (constr == null || proto == null) return;
 
         proto.defineProperty(null, "constructor", constr, true, false, false);
         constr.defineProperty(null, "prototype", proto, true, false, false);
@@ -290,59 +337,85 @@ public class NativeWrapperProvider implements WrapperProvider {
         prototypes.put(clazz, proto);
         constructors.put(clazz, constr);
 
-        var parent = clazz.getSuperclass();
+        updateProtoChain(clazz, proto, constr);
-        if (parent == null) return;
-
-        var parentProto = getProto(parent);
-        var parentConstr = getConstr(parent);
-
-        if (parentProto != null) Values.setPrototype(Context.NULL, proto, parentProto);
-        if (parentConstr != null) Values.setPrototype(Context.NULL, constr, parentConstr);
     }
 
     public ObjectValue getProto(Class<?> clazz) {
+        if (proxyToClass.containsKey(clazz)) return getProto(proxyToClass.get(clazz));
+
         initType(clazz, constructors.get(clazz), prototypes.get(clazz));
-        return prototypes.get(clazz);
+        while (clazz != null) {
+            var res = prototypes.get(clazz);
+            if (res != null) return res;
+            clazz = clazz.getSuperclass();
+        }
+        return null;
     }
     public ObjectValue getNamespace(Class<?> clazz) {
-        if (!namespaces.containsKey(clazz)) namespaces.put(clazz, makeNamespace(env, clazz));
+        if (proxyToClass.containsKey(clazz)) return getNamespace(proxyToClass.get(clazz));
-        return namespaces.get(clazz);
+
+        if (!namespaces.containsKey(clazz)) namespaces.put(clazz, makeNamespace(clazz));
+        while (clazz != null) {
+            var res = namespaces.get(clazz);
+            if (res != null) return res;
+            clazz = clazz.getSuperclass();
+        }
+        return null;
     }
     public FunctionValue getConstr(Class<?> clazz) {
+        if (proxyToClass.containsKey(clazz)) return getConstr(proxyToClass.get(clazz));
+
         initType(clazz, constructors.get(clazz), prototypes.get(clazz));
-        return constructors.get(clazz);
+        while (clazz != null) {
+            var res = constructors.get(clazz);
+            if (res != null) return res;
+            clazz = clazz.getSuperclass();
+        }
+        return null;
     }
 
-    @Override public WrapperProvider fork(Environment env) {
+    public NativeWrapperProvider copy() {
-        return new NativeWrapperProvider(env);
+        var res = new NativeWrapperProvider();
+
+        for (var pair : classToProxy.entrySet()) {
+            res.set(pair.getKey(), pair.getValue());
+        }
+
+        return this;
     }
 
-    public void setProto(Class<?> clazz, ObjectValue value) {
+    public void set(Class<?> clazz, Class<?> wrapper) {
-        prototypes.put(clazz, value);
+        if (clazz == null) return;
-    }
+        if (wrapper == null) wrapper = clazz;
-    public void setConstr(Class<?> clazz, FunctionValue value) {
+        if (classToProxy.get(clazz) == wrapper) return;
-        constructors.put(clazz, value);
-    }
 
-    private void initError() {
+        classToProxy.remove(wrapper);
-        var proto = new ObjectValue();
+        proxyToClass.remove(clazz);
-        proto.defineProperty(null, "message", new NativeFunction("message", args -> {
+
-            if (args.self instanceof Throwable) return ((Throwable)args.self).getMessage();
+        classToProxy.put(clazz, wrapper);
-            else return null;
+        proxyToClass.put(wrapper, clazz);
-        }));
+
-        proto.defineProperty(null, "name", new NativeFunction("name", args -> getName(args.self.getClass())));
+        ignore.remove(clazz);
-        proto.defineProperty(null, "toString", new NativeFunction("toString", args -> args.self.toString()));
+
+        var proto = makeProto(wrapper);
+        var constr = makeConstructor(wrapper);
+
+        prototypes.put(clazz, proto);
+        constructors.put(clazz, constr);
 
-        var constr = makeConstructor(null, Throwable.class);
         proto.defineProperty(null, "constructor", constr, true, false, false);
         constr.defineProperty(null, "prototype", proto, true, false, false);
 
-        setProto(Throwable.class, proto);
+        for (var el : prototypes.keySet()) {
-        setConstr(Throwable.class, constr);
+            if (clazz.isAssignableFrom(el)) {
+                updateProtoChain(el, getProto(el), getConstr(el));
+            }
+        }
     }
 
-    public NativeWrapperProvider(Environment env) {
+    public NativeWrapperProvider() { }
-        this.env = env;
+
-        initError();
+    public static NativeWrapperProvider get(Extensions ext) {
+        return ext.get(KEY);
     }
 }

src/java/me/topchetoeu/jscript/utils/modules/Module.java

@@ -1,6 +1,6 @@
 package me.topchetoeu.jscript.utils.modules;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
 
 public abstract class Module {
     private Object value;

src/java/me/topchetoeu/jscript/utils/modules/ModuleRepo.java

@@ -3,9 +3,9 @@ package me.topchetoeu.jscript.utils.modules;
 import java.util.HashMap;
 
 import me.topchetoeu.jscript.common.Filename;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Extensions;
+import me.topchetoeu.jscript.runtime.Extensions;
-import me.topchetoeu.jscript.core.Key;
+import me.topchetoeu.jscript.runtime.Key;
 import me.topchetoeu.jscript.utils.filesystem.Filesystem;
 import me.topchetoeu.jscript.utils.filesystem.Mode;
 
@@ -25,7 +25,7 @@ public interface ModuleRepo {
 
             if (modules.containsKey(name)) return modules.get(name);
 
-            var env = ctx.environment.child();
+            var env = ctx.extensions.child();
             env.add(CWD, fs.normalize(name, ".."));
 
             var mod = new SourceModule(filename, src, env);

src/java/me/topchetoeu/jscript/utils/modules/RootModuleRepo.java

@@ -2,8 +2,8 @@ package me.topchetoeu.jscript.utils.modules;
 
 import java.util.HashMap;
 
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.runtime.exceptions.EngineException;
 
 public class RootModuleRepo implements ModuleRepo {
     public final HashMap<String, ModuleRepo> repos = new HashMap<>();

src/java/me/topchetoeu/jscript/utils/modules/SourceModule.java

@@ -1,23 +1,23 @@
 package me.topchetoeu.jscript.utils.modules;
 
 import me.topchetoeu.jscript.common.Filename;
-import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.runtime.Context;
-import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.runtime.Extensions;
 
 public class SourceModule extends Module {
     public final Filename filename;
     public final String source;
-    public final Environment env;
+    public final Extensions ext;
 
     @Override
     protected Object onLoad(Context ctx) {
-        var res = new Context(env).compile(filename, source);
+        var res = new Context(ext).compile(filename, source);
         return res.call(ctx);
     }
 
-    public SourceModule(Filename filename, String source, Environment env) {
+    public SourceModule(Filename filename, String source, Extensions ext) {
         this.filename = filename;
         this.source = source;
-        this.env = env;
+        this.ext = ext;
     }
 }