fix: source map decoding

compilation/src/main/java/me/topchetoeu/j2s/compilation/CompileResult.java

@@ -1,168 +1,168 @@
-package me.topchetoeu.j2s.compilation;
-
-import java.util.List;
-import java.util.Map;
-import java.util.Stack;
-import java.util.function.Function;
-
-import me.topchetoeu.j2s.common.Environment;
-import me.topchetoeu.j2s.common.FunctionBody;
-import me.topchetoeu.j2s.common.Instruction;
-import me.topchetoeu.j2s.common.Key;
-import me.topchetoeu.j2s.common.Location;
-import me.topchetoeu.j2s.common.Instruction.BreakpointType;
-import me.topchetoeu.j2s.compilation.CompilationFunctionMap.FunctionMapBuilder;
-import me.topchetoeu.j2s.compilation.control.TryNode;
-import me.topchetoeu.j2s.compilation.scope.FunctionScope;
-import me.topchetoeu.j2s.compilation.scope.Variable;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedList;
-
-public final class CompileResult {
-	public static final Key<Void> DEBUG_LOG = new Key<>();
-
-	private FunctionBody body;
-	public final List<Instruction> instructions;
-	public final List<CompileResult> children;
-	public final Map<FunctionNode, CompileResult> childrenMap = new HashMap<>();
-	public final Map<FunctionNode, Integer> childrenIndices = new HashMap<>();
-	public final FunctionMapBuilder map;
-	public final Environment env;
-	public int length;
-	public final FunctionScope scope;
-	public final Map<TryNode, Variable> catchBindings = new HashMap<>();
-
-	public int temp() {
-		instructions.add(null);
-		return instructions.size() - 1;
-	}
-
-	public CompileResult add(Instruction instr) {
-		instructions.add(instr);
-		return this;
-	}
-	public CompileResult set(int i, Instruction instr) {
-		instructions.set(i, instr);
-		return this;
-	}
-
-	public int size() { return instructions.size(); }
-
-	public void setDebug(Location loc, BreakpointType type) {
-		map.setDebug(loc, type);
-	}
-	public void setLocation(int i, Location loc) {
-		map.setLocation(i, loc);
-	}
-	public void setLocationAndDebug(int i, Location loc, BreakpointType type) {
-		map.setLocationAndDebug(i, loc, type);
-	}
-	public void setDebug(BreakpointType type) {
-		setDebug(map.last(), type);
-	}
-	public void setLocation(Location type) {
-		setLocation(instructions.size() - 1, type);
-	}
-
-	public void setLocationAndDebug(Location loc, BreakpointType type) {
-		setLocationAndDebug(instructions.size() - 1, loc, type);
-	}
-	
-	public Iterable<CompileResult> all() {
-		var stack = new Stack<CompileResult>();
-		stack.push(this);
-
-		return () -> new Iterator<CompileResult>() {
-			@Override public CompileResult next() {
-				if (stack.empty()) return null;
-				else {
-					var res = stack.pop();
-					for (var child : res.children) {
-						stack.push(child);
-					}
-					return res;
-				}
-			}
-			@Override public boolean hasNext() {
-				return !stack.empty();
-			}
-		};
-	}
-
-	public CompileResult addChild(FunctionNode node, CompileResult res) {
-		this.children.add(res);
-		this.childrenMap.put(node, res);
-		this.childrenIndices.put(node, this.children.size() - 1);
-		return res;
-	}
-
-	public Instruction[] instructions() {
-		return instructions.toArray(new Instruction[0]);
-	}
-
-	public CompilationFunctionMap map(Function<Location, Location> mapper) {
-		return map.map(mapper).build(scope.localNames(), scope.capturableNames(), scope.captureNames());
-	}
-	public CompilationFunctionMap map() {
-		return map.build(scope.localNames(), scope.capturableNames(), scope.captureNames());
-	}
-	public FunctionBody body() {
-		if (body != null) return body;
-
-		var builtChildren = new FunctionBody[children.size()];
-		for (var i = 0; i < children.size(); i++) builtChildren[i] = children.get(i).body();
-
-		var instrRes = instructions();
-
-		if (env.has(DEBUG_LOG)) {
-			System.out.println("================= BODY =================");
-			System.out.println("LOCALS: " + scope.localsCount());
-			System.out.println("CAPTURABLES: " + scope.capturablesCount());
-			System.out.println("CAPTURES: " + scope.capturesCount());
-
-			for (var instr : instrRes) System.out.println(instr);
-		}
-
-		return body = new FunctionBody(
-			scope.localsCount(), scope.capturablesCount(), scope.capturesCount(),
-			length, instrRes, builtChildren
-		);
-	}
-
-	public CompileResult subtarget() {
-		return new CompileResult(env, new FunctionScope(scope), this);
-	}
-
-	public CompileResult setEnvironment(Environment env) {
-		return new CompileResult(env, scope, this);
-	}
-	/**
-	 * Returns a compile result with a child of the environment that relates to the given key.
-	 * In essence, this is used to create a compile result which is back at the root environment of the compilation
-	 */
-	public CompileResult rootEnvironment(Key<Environment> env) {
-		return new CompileResult(this.env.get(env).child(), scope, this);
-	}
-	public CompileResult subEnvironment() {
-		return new CompileResult(env.child(), scope, this);
-	}
-
-	public CompileResult(Environment env, FunctionScope scope, int length) {
-		this.scope = scope;
-		this.instructions = new ArrayList<>();
-		this.children = new LinkedList<>();
-		this.map = CompilationFunctionMap.builder();
-		this.env = env;
-		this.length = length;
-	}
-	private CompileResult(Environment env, FunctionScope scope, CompileResult parent) {
-		this.scope = scope;
-		this.instructions = parent.instructions;
-		this.children = parent.children;
-		this.map = parent.map;
-		this.env = env;
-	}
-}
+package me.topchetoeu.j2s.compilation;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Stack;
+import java.util.function.Function;
+
+import me.topchetoeu.j2s.common.Environment;
+import me.topchetoeu.j2s.common.FunctionBody;
+import me.topchetoeu.j2s.common.Instruction;
+import me.topchetoeu.j2s.common.Key;
+import me.topchetoeu.j2s.common.Location;
+import me.topchetoeu.j2s.common.Instruction.BreakpointType;
+import me.topchetoeu.j2s.compilation.CompilationFunctionMap.FunctionMapBuilder;
+import me.topchetoeu.j2s.compilation.control.TryNode;
+import me.topchetoeu.j2s.compilation.scope.FunctionScope;
+import me.topchetoeu.j2s.compilation.scope.Variable;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedList;
+
+public final class CompileResult {
+	public static final Key<Void> DEBUG_LOG = new Key<>();
+
+	private FunctionBody body;
+	public final List<Instruction> instructions;
+	public final List<CompileResult> children;
+	public final Map<FunctionNode, CompileResult> childrenMap = new HashMap<>();
+	public final Map<FunctionNode, Integer> childrenIndices = new HashMap<>();
+	public final FunctionMapBuilder map;
+	public final Environment env;
+	public int length;
+	public final FunctionScope scope;
+	public final Map<TryNode, Variable> catchBindings = new HashMap<>();
+
+	public int temp() {
+		instructions.add(null);
+		return instructions.size() - 1;
+	}
+
+	public CompileResult add(Instruction instr) {
+		instructions.add(instr);
+		return this;
+	}
+	public CompileResult set(int i, Instruction instr) {
+		instructions.set(i, instr);
+		return this;
+	}
+
+	public int size() { return instructions.size(); }
+
+	public void setDebug(Location loc, BreakpointType type) {
+		map.setDebug(loc, type);
+	}
+	public void setLocation(int i, Location loc) {
+		map.setLocation(i, loc);
+	}
+	public void setLocationAndDebug(int i, Location loc, BreakpointType type) {
+		map.setLocationAndDebug(i, loc, type);
+	}
+	public void setDebug(BreakpointType type) {
+		setDebug(map.last(), type);
+	}
+	public void setLocation(Location type) {
+		setLocation(instructions.size() - 1, type);
+	}
+
+	public void setLocationAndDebug(Location loc, BreakpointType type) {
+		setLocationAndDebug(instructions.size() - 1, loc, type);
+	}
+
+	public Iterable<CompileResult> all() {
+		var stack = new Stack<CompileResult>();
+		stack.push(this);
+
+		return () -> new Iterator<CompileResult>() {
+			@Override public CompileResult next() {
+				if (stack.empty()) return null;
+				else {
+					var res = stack.pop();
+					for (var child : res.children) {
+						stack.push(child);
+					}
+					return res;
+				}
+			}
+			@Override public boolean hasNext() {
+				return !stack.empty();
+			}
+		};
+	}
+
+	public CompileResult addChild(FunctionNode node, CompileResult res) {
+		this.children.add(res);
+		this.childrenMap.put(node, res);
+		this.childrenIndices.put(node, this.children.size() - 1);
+		return res;
+	}
+
+	public Instruction[] instructions() {
+		return instructions.toArray(new Instruction[0]);
+	}
+
+	public CompilationFunctionMap map(Function<Location, Location> mapper) {
+		return map.map(mapper).build(scope.localNames(), scope.capturableNames(), scope.captureNames());
+	}
+	public CompilationFunctionMap map() {
+		return map.build(scope.localNames(), scope.capturableNames(), scope.captureNames());
+	}
+	public FunctionBody body() {
+		if (body != null) return body;
+
+		var builtChildren = new FunctionBody[children.size()];
+		for (var i = 0; i < children.size(); i++) builtChildren[i] = children.get(i).body();
+
+		var instrRes = instructions();
+
+		if (env.has(DEBUG_LOG)) {
+			System.out.println("================= BODY =================");
+			System.out.println("LOCALS: " + scope.localsCount());
+			System.out.println("CAPTURABLES: " + scope.capturablesCount());
+			System.out.println("CAPTURES: " + scope.capturesCount());
+
+			for (var instr : instrRes) System.out.println(instr);
+		}
+
+		return body = new FunctionBody(
+			scope.localsCount(), scope.capturablesCount(), scope.capturesCount(),
+			length, instrRes, builtChildren
+		);
+	}
+
+	public CompileResult subtarget() {
+		return new CompileResult(env, new FunctionScope(scope), this);
+	}
+
+	public CompileResult setEnvironment(Environment env) {
+		return new CompileResult(env, scope, this);
+	}
+	/**
+	 * Returns a compile result with a child of the environment that relates to the given key.
+	 * In essence, this is used to create a compile result which is back at the root environment of the compilation
+	 */
+	public CompileResult rootEnvironment(Key<Environment> env) {
+		return new CompileResult(this.env.get(env).child(), scope, this);
+	}
+	public CompileResult subEnvironment() {
+		return new CompileResult(env.child(), scope, this);
+	}
+
+	public CompileResult(Environment env, FunctionScope scope, int length) {
+		this.scope = scope;
+		this.instructions = new ArrayList<>();
+		this.children = new LinkedList<>();
+		this.map = CompilationFunctionMap.builder();
+		this.env = env;
+		this.length = length;
+	}
+	private CompileResult(Environment env, FunctionScope scope, CompileResult parent) {
+		this.scope = scope;
+		this.instructions = parent.instructions;
+		this.children = parent.children;
+		this.map = parent.map;
+		this.env = env;
+	}
+}

compilation/src/main/java/me/topchetoeu/j2s/compilation/CompoundNode.java

@@ -1,112 +1,114 @@
-package me.topchetoeu.j2s.compilation;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-
-import me.topchetoeu.j2s.common.Instruction;
-import me.topchetoeu.j2s.common.Location;
-import me.topchetoeu.j2s.common.Instruction.BreakpointType;
-import me.topchetoeu.j2s.compilation.parsing.ParseRes;
-import me.topchetoeu.j2s.compilation.parsing.Parsing;
-import me.topchetoeu.j2s.compilation.parsing.Source;
-
-
-public class CompoundNode extends Node {
-	public final Node[] statements;
-	public Location end;
-
-	@Override public void resolve(CompileResult target) {
-		for (var stm : statements) stm.resolve(target);
-	}
-	@Override public void compileFunctions(CompileResult target) {
-		for (var stm : statements) stm.compileFunctions(target);
-	}
-
-	public void compile(CompileResult target, boolean pollute, BreakpointType type) {
-		List<Node> statements = new ArrayList<Node>();
-
-		for (var stm : this.statements) {
-			if (stm instanceof FunctionStatementNode func) {
-				func.compile(target, false);
-			}
-			else statements.add(stm);
-		}
-
-		var polluted = false;
-
-		for (var i = 0; i < statements.size(); i++) {
-			var stm = statements.get(i);
-
-			if (i != statements.size() - 1) stm.compile(target, false, BreakpointType.STEP_OVER);
-			else stm.compile(target, polluted = pollute, BreakpointType.STEP_OVER);
-		}
-
-		if (!polluted && pollute) {
-			target.add(Instruction.pushUndefined());
-		}
-	}
-
-	public CompoundNode setEnd(Location loc) {
-		this.end = loc;
-		return this;
-	}
-
-	public CompoundNode(Location loc, Node ...statements) {
-		super(loc);
-		this.statements = statements;
-	}
-
-	public static ParseRes<CompoundNode> parseComma(Source src, int i, Node prev, int precedence) {
-		if (precedence > 1) return ParseRes.failed();
-
-		var n = Parsing.skipEmpty(src, i);
-		var loc = src.loc(i + n);
-
-		if (!src.is(i + n, ",")) return ParseRes.failed();
-		n++;
-
-		var curr = JavaScript.parseExpression(src, i + n, 2);
-		if (!curr.isSuccess()) return curr.chainError(src.loc(i + n), "Expected a value after the comma");
-		n += curr.n;
-
-		if (prev instanceof CompoundNode comp) {
-			var children = new ArrayList<Node>();
-			children.addAll(Arrays.asList(comp.statements));
-			children.add(curr.result);
-
-			return ParseRes.res(new CompoundNode(loc, children.toArray(new Node[0])), n);
-		}
-		else return ParseRes.res(new CompoundNode(loc, prev, curr.result), n);
-	}
-	public static ParseRes<CompoundNode> parse(Source src, int i) {
-		var n = Parsing.skipEmpty(src, i);
-		var loc = src.loc(i + n);
-
-		if (!src.is(i + n, "{")) return ParseRes.failed();
-		n++;
-
-		var statements = new ArrayList<Node>();
-
-		while (true) {
-			n += Parsing.skipEmpty(src, i + n);
-
-			if (src.is(i + n, "}")) {
-				n++;
-				break;
-			}
-			if (src.is(i + n, ";")) {
-				n++;
-				continue;
-			}
-
-			var res = JavaScript.parseStatement(src, i + n);
-			if (!res.isSuccess()) return res.chainError(src.loc(i + n), "Expected a statement");
-			n += res.n;
-
-			statements.add(res.result);
-		}
-
-		return ParseRes.res(new CompoundNode(loc, statements.toArray(new Node[0])).setEnd(src.loc(i + n - 1)), n);
-	}
-}
+package me.topchetoeu.j2s.compilation;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import me.topchetoeu.j2s.common.Instruction;
+import me.topchetoeu.j2s.common.Location;
+import me.topchetoeu.j2s.common.Instruction.BreakpointType;
+import me.topchetoeu.j2s.compilation.parsing.ParseRes;
+import me.topchetoeu.j2s.compilation.parsing.Parsing;
+import me.topchetoeu.j2s.compilation.parsing.Source;
+
+
+public class CompoundNode extends Node {
+	public final Node[] statements;
+	public Location end;
+
+	@Override public void resolve(CompileResult target) {
+		for (var stm : statements) stm.resolve(target);
+	}
+	@Override public void compileFunctions(CompileResult target) {
+		for (var stm : statements) stm.compileFunctions(target);
+	}
+
+	public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+		List<Node> statements = new ArrayList<Node>();
+
+		for (var stm : this.statements) {
+			if (stm instanceof FunctionStatementNode func) {
+				func.compile(target, false);
+			}
+			else statements.add(stm);
+		}
+
+		var polluted = false;
+
+		for (var i = 0; i < statements.size(); i++) {
+			var stm = statements.get(i);
+
+			if (i != statements.size() - 1) stm.compileStatement(target, false, BreakpointType.STEP_OVER);
+			else stm.compileStatement(target, polluted = pollute, BreakpointType.STEP_OVER);
+
+			target.setDebug(type);
+		}
+
+		if (!polluted && pollute) {
+			target.add(Instruction.pushUndefined());
+		}
+	}
+
+	public CompoundNode setEnd(Location loc) {
+		this.end = loc;
+		return this;
+	}
+
+	public CompoundNode(Location loc, Node ...statements) {
+		super(loc);
+		this.statements = statements;
+	}
+
+	public static ParseRes<CompoundNode> parseComma(Source src, int i, Node prev, int precedence) {
+		if (precedence > 1) return ParseRes.failed();
+
+		var n = Parsing.skipEmpty(src, i);
+		var loc = src.loc(i + n);
+
+		if (!src.is(i + n, ",")) return ParseRes.failed();
+		n++;
+
+		var curr = JavaScript.parseExpression(src, i + n, 2);
+		if (!curr.isSuccess()) return curr.chainError(src.loc(i + n), "Expected a value after the comma");
+		n += curr.n;
+
+		if (prev instanceof CompoundNode comp) {
+			var children = new ArrayList<Node>();
+			children.addAll(Arrays.asList(comp.statements));
+			children.add(curr.result);
+
+			return ParseRes.res(new CompoundNode(loc, children.toArray(new Node[0])), n);
+		}
+		else return ParseRes.res(new CompoundNode(loc, prev, curr.result), n);
+	}
+	public static ParseRes<CompoundNode> parse(Source src, int i) {
+		var n = Parsing.skipEmpty(src, i);
+		var loc = src.loc(i + n);
+
+		if (!src.is(i + n, "{")) return ParseRes.failed();
+		n++;
+
+		var statements = new ArrayList<Node>();
+
+		while (true) {
+			n += Parsing.skipEmpty(src, i + n);
+
+			if (src.is(i + n, "}")) {
+				n++;
+				break;
+			}
+			if (src.is(i + n, ";")) {
+				n++;
+				continue;
+			}
+
+			var res = JavaScript.parseStatement(src, i + n);
+			if (!res.isSuccess()) return res.chainError(src.loc(i + n), "Expected a statement");
+			n += res.n;
+
+			statements.add(res.result);
+		}
+
+		return ParseRes.res(new CompoundNode(loc, statements.toArray(new Node[0])).setEnd(src.loc(i + n - 1)), n);
+	}
+}

compilation/src/main/java/me/topchetoeu/j2s/compilation/Node.java

@@ -1,28 +1,33 @@
-package me.topchetoeu.j2s.compilation;
-
-import me.topchetoeu.j2s.common.Location;
-import me.topchetoeu.j2s.common.Instruction.BreakpointType;
-
-public abstract class Node {
-	private Location loc;
-
-	public void resolve(CompileResult target) {}
-
-	public void compile(CompileResult target, boolean pollute, BreakpointType type) {
-		int start = target.size();
-		compile(target, pollute);
-		if (target.size() != start) target.setLocationAndDebug(start, loc(), type);
-	}
-	public void compile(CompileResult target, boolean pollute) {
-		compile(target, pollute, BreakpointType.NONE);
-	}
-
-	public abstract void compileFunctions(CompileResult target);
-
-	public Location loc() { return loc; }
-	public void setLoc(Location loc) { this.loc = loc; }
-
-	protected Node(Location loc) {
-		this.loc = loc;
-	}
-}
+package me.topchetoeu.j2s.compilation;
+
+import me.topchetoeu.j2s.common.Location;
+import me.topchetoeu.j2s.common.Instruction.BreakpointType;
+
+public abstract class Node {
+	private Location loc;
+
+	public void resolve(CompileResult target) {}
+
+	public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+		compileStatement(target, pollute, type);
+	}
+	public void compileStatement(CompileResult target, boolean pollute, BreakpointType type) {
+		int start = target.size();
+		compile(target, pollute);
+		if (target.size() != start) {
+			target.setLocationAndDebug(start, loc(), type);
+		}
+	}
+	public void compile(CompileResult target, boolean pollute) {
+		compile(target, pollute, BreakpointType.NONE);
+	}
+
+	public abstract void compileFunctions(CompileResult target);
+
+	public Location loc() { return loc; }
+	public void setLoc(Location loc) { this.loc = loc; }
+
+	protected Node(Location loc) {
+		this.loc = loc;
+	}
+}

lib/src/main/java/me/topchetoeu/j2s/lib/debug/SimpleDebugger.java

@@ -423,7 +423,7 @@ public class SimpleDebugger implements Debugger {
 							desc.append("...");
 							break;
 						}
-	
+
 						if (arr.has(i)) {
 							try {
 								var curr = arr.get(i);
@@ -442,7 +442,7 @@ public class SimpleDebugger implements Debugger {
 							desc.append("<empty>");
 						}
 					}
-	
+
 					desc.append("]");
 				}
 
@@ -814,7 +814,6 @@ public class SimpleDebugger implements Debugger {
 		var cond = msg.params.string("condition", "").trim();
 
 		if (cond.equals("")) cond = null;
-		if (cond != null) cond  = "(" + cond + ")";
 
 		Pattern regex;
 
@@ -1064,7 +1063,7 @@ public class SimpleDebugger implements Debugger {
 		}
 		mappings.put(body, map);
 	}
-	
+
 	private boolean instructionLock;
 
 	@Override public boolean onInstruction(Environment env, Frame cf, Instruction instruction, Value returnVal, EngineException error, boolean caught) {
@@ -1077,16 +1076,16 @@ public class SimpleDebugger implements Debugger {
 			Location loc;
 			DebugFrame frame;
 			BreakpointType bptType;
-	
+
 			frame = getFrame(cf);
-	
+
 			var map = DebugHandler.get(env).getMapOrEmpty(env, frame.frame.function);
-	
+
 			frame.updateLoc(map.toLocation(frame.frame.codePtr));
 			loc = frame.location;
 			bptType = map.getBreakpoint(frame.frame.codePtr);
 			isBreakpointable = loc != null && (bptType.shouldStepIn());
-	
+
 			if (error != null && (execptionType == CatchType.ALL || execptionType == CatchType.UNCAUGHT && !caught)) {
 				pauseException(env, error);
 			}
@@ -1114,19 +1113,19 @@ public class SimpleDebugger implements Debugger {
 				instruction.params.length == 1 &&
 				instruction.get(0).equals("debug")
 			) pauseDebug(env, null);
-	
+
 			synchronized (this) {
 			}
-	
+
 			while (enabled) {
 				synchronized (this) {
 					switch (state) {
 						case PAUSED_EXCEPTION:
 						case PAUSED_NORMAL: break;
-	
+
 						case STEPPING_OUT:
 						case RESUMED: return false;
-	
+
 						case STEPPING_IN:
 						case STEPPING_OVER:
 							if (stepOutFrame.frame == frame.frame) {
@@ -1135,7 +1134,7 @@ public class SimpleDebugger implements Debugger {
 									continue;
 								}
 								else if (stepOutPtr != frame.frame.codePtr) {
-	
+
 									if (state == State.STEPPING_IN && bptType.shouldStepIn()) {
 										pauseDebug(env, null);
 										break;
@@ -1149,7 +1148,7 @@ public class SimpleDebugger implements Debugger {
 							return false;
 					}
 				}
-	
+
 				try {
 					synchronized (updateNotifier) {
 						updateNotifier.wait();

lib/src/transpiler/map.ts

@@ -1,10 +1,11 @@
-const map: number[] = [];
-let j = 0;
-
-for (let i = 65; i <= 90; i++) map[i] = j++;
-for (let i = 97; i <= 122; i++) map[i] = j++;
-map[43] = j++;
-map[47] = j++;
+function decodeBase64(val: number) {
+	if (val >= 65 && val <= 90) return val - 65;
+	else if (val >= 97 && val <= 122) return val - 97 + 26;
+	else if (val >= 48 && val <= 57) return val - 48 + 52;
+	else if (val == 43) return 62;
+	else if (val == 47) return 63;
+	else throw "Invalid Base64 char";
+}
 
 export function decodeVLQ(val: string): number[][][] {
 	const lines: number[][][] = [];
@@ -30,14 +31,14 @@ export function decodeVLQ(val: string): number[][][] {
 
 				for (let i = 0; i < el.length;) {
 					let sign = 1;
-					let curr = map[el.charCodeAt(i++)];
+					let curr = decodeBase64(el.charCodeAt(i++));
 					let cont = (curr & 0x20) === 0x20;
 					if ((curr & 1) === 1) sign = -1;
 					let res = (curr & 0b11110) >> 1;
 					let n = 4;
-		
+
 					for (; i < el.length && cont;) {
-						curr = map[el.charCodeAt(i++)];
+						curr = decodeBase64(el.charCodeAt(i++));
 						cont = (curr & 0x20) == 0x20;
 						res |= (curr & 0b11111) << n;
 						n += 5;
@@ -99,7 +100,7 @@ export class VLQSourceMap {
 
 			while (true) {
 				const done = b - a <= 1;
-	
+
 				const mid = (a + b) >> 1;
 				const el = line[mid];
 
@@ -134,7 +135,6 @@ export class VLQSourceMap {
 		let originalRow = 0;
 		let originalCol = 0;
 		let originalFile = 0;
-		const lastCols = new Set<number>();
 
 		for (let compiledRow = 0; compiledRow < mapping.length; compiledRow++) {
 			const line: [start: number, dst: Location][] = file[compiledRow] = [];
@@ -149,10 +149,7 @@ export class VLQSourceMap {
 				originalRow += rawSeg.length > 2 ? rawSeg[2] : 0;
 				originalCol += rawSeg.length > 3 ? rawSeg[3] : 0;
 
-				if (!lastCols.has(compiledCol)) {
-					line[line.length] = [compiledCol, [filenames[originalFile], originalRow, originalCol]];
-				}
-				lastCols.add(compiledCol);
+				line[line.length] = [compiledCol, [filenames[originalFile], originalRow, originalCol]];
 			}
 
 			line.sort((a, b) => a[0] - b[0]);

repl/src/main/java/me/topchetoeu/j2s/repl/SimpleRepl.java

@@ -7,6 +7,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.InetSocketAddress;
+import java.util.ArrayList;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.ExecutionException;
 
@@ -41,55 +42,61 @@ public class SimpleRepl {
 	static Key<InputStream> STDIN = new Key<>();
 
 	static int j = 0;
-	static String[] args;
+	static String[] files;
+	static boolean inspect = false;
+	static int inspectPort = 9229;
 
 	private static void reader() {
 		try {
-			server = new DebugServer();
-			debugTask = server.start(new InetSocketAddress("127.0.0.1", 9229), true);
-			server.targets.put("default", (socket, req) -> new SimpleDebugger(socket)
-				.attach((SimpleDebugHandler)DebugHandler.get(environment))
-			);
+			if (inspect) {
+				server = new DebugServer();
+				debugTask = server.start(new InetSocketAddress("127.0.0.1", inspectPort), true);
+				server.targets.put("default", (socket, req) -> new SimpleDebugger(socket)
+					.attach((SimpleDebugHandler)DebugHandler.get(environment))
+				);
+				System.out.println("Debug server started at localhost:" + inspectPort);
+			}
 
 			System.out.println(String.format("Running %s v%s by %s", Metadata.name(), Metadata.version(), Metadata.author()));
 
-			for (var arg : args) {
-				var file = new File(arg);
-				var raw = Reading.streamToString(new FileInputStream(file));
+			if (files.length > 0) {
+				for (var arg : files) {
+					var file = new File(arg);
+					var raw = Reading.streamToString(new FileInputStream(file));
 
-				try {
 					try {
-						var res = engine.pushMsg(
-							false, environment,
-							Filename.fromFile(file), raw, null
-						).get();
+						try {
+							var res = engine.pushMsg(
+								false, environment,
+								Filename.fromFile(file), raw, null
+							).get();
 
-						System.err.println(res.toReadable(environment));
+							System.err.println(res.toReadable(environment));
+						}
+						catch (ExecutionException e) { throw e.getCause(); }
 					}
-					catch (ExecutionException e) { throw e.getCause(); }
+					catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
 				}
-				catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
-
 			}
+			else {
+				for (var i = 0; ; i++) {
+					var raw = Reading.readline();
 
-			for (var i = 0; ; i++) {
-				var raw = Reading.readline();
+					if (raw == null) break;
 
-				if (raw == null) break;
-
-				try {
 					try {
-						var res = engine.pushMsg(
-							false, environment,
-							new Filename(Metadata.name(), "repl/" + i + ".js"), raw,
-							Value.UNDEFINED
-						).get();
-						System.err.println(res.toReadable(environment));
+						try {
+							var res = engine.pushMsg(
+								false, environment,
+								new Filename(Metadata.name(), "repl/" + i + ".js"), raw,
+								Value.UNDEFINED
+							).get();
+							System.err.println(res.toReadable(environment));
+						}
+						catch (ExecutionException e) { throw e.getCause(); }
 					}
-					catch (ExecutionException e) { throw e.getCause(); }
+					catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
 				}
-				catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
-
 			}
 		}
 		catch (EngineException | SyntaxException e) { System.err.println(Value.errorToReadable(environment, e, null)); }
@@ -104,11 +111,30 @@ public class SimpleRepl {
 		}
 	}
 
-	private static Environment createESEnv() {
+	private static Environment createESEnv(String compiler) {
 		var env = StdLib.apply(null);
 		env.add(EventLoop.KEY, engine);
 		env.add(DebugHandler.KEY, new SimpleDebugHandler());
-		env.add(Compiler.KEY, Compilers.chainTranspilers(Compilers.jsCompiler(), env, Compilers::babelCompiler));
+
+		switch (compiler) {
+			case "typescript":
+			case "ts":
+				env.add(Compiler.KEY, Compilers.chainTranspilers(Compilers.jsCompiler(), env, Compilers::typescriptCompiler));
+				break;
+			case "coffeescript":
+			case "cs":
+				env.add(Compiler.KEY, Compilers.chainTranspilers(Compilers.jsCompiler(), env, Compilers::babelCompiler, Compilers::coffeescriptCompiler));
+				break;
+			case "babel":
+			case "es6":
+			case "esnext":
+				env.add(Compiler.KEY, Compilers.chainTranspilers(Compilers.jsCompiler(), env, Compilers::babelCompiler));
+				break;
+			default:
+			case "js":
+				env.add(Compiler.KEY, Compilers.jsCompiler());
+				break;
+		}
 
 		var glob = Value.global(env);
 
@@ -137,10 +163,29 @@ public class SimpleRepl {
 	}
 
 	public static void main(String args[]) throws InterruptedException {
-		SimpleRepl.args = args;
+		var compiler = "js";
+		var files = new ArrayList<String>();
+
+		for (String arg : args) {
+			if (arg.startsWith("--lang=")) {
+				compiler = arg.substring(7);
+			}
+			else if (arg.equals("--inspect")) {
+				inspect = true;
+			}
+			else if (arg.startsWith("--inspect=")) {
+				inspect = true;
+				inspectPort = Integer.parseInt(arg.substring(10));
+			}
+			else {
+				files.add(arg);
+			}
+		}
+
+		SimpleRepl.files = files.toArray(new String[0]);
 		var reader = new Thread(SimpleRepl::reader);
 
-		environment = createESEnv();
+		environment = createESEnv(compiler);
 
 		initEngine();
 
@@ -150,6 +195,6 @@ public class SimpleRepl {
 
 		reader.join();
 		engineTask.interrupt();
-		debugTask.interrupt();
+		if (debugTask != null) debugTask.interrupt();
 	}
 }

runtime/src/main/java/me/topchetoeu/j2s/runtime/debug/DebugHandler.java

@@ -93,7 +93,7 @@ public interface DebugHandler {
 	}
 	public default FunctionMap getMapOrEmpty(Environment env, FunctionValue func) {
 		if (func instanceof CodeFunction codeFunc) return getMapOrEmpty(env, codeFunc.body);
-		else return null;
+		else return FunctionMap.EMPTY;
 	}
 
 	public static DebugHandler get(Environment exts) {

runtime/src/main/java/me/topchetoeu/j2s/runtime/values/objects/ArrayLikeValue.java

@@ -195,7 +195,6 @@ public abstract class ArrayLikeValue extends ObjectValue {
 				res.add("    " + line);
 			}
 		}
-		res.set(res.size() - 1, res.getLast().substring(0, res.getLast().length() - 1));
 		res.add("]");
 
 		return res;