feat: make better native wrapper API

src/me/topchetoeu/jscript/Main.java

@@ -94,15 +94,15 @@ public class Main {
     private static void initEnv() {
         environment = Internals.apply(environment);
 
-        environment.global.define(false, new NativeFunction("exit", (_ctx, th, args) -> {
+        environment.global.define(false, new NativeFunction("exit", args -> {
             exited = true;
             throw new InterruptException();
         }));
-        environment.global.define(false, new NativeFunction("go", (_ctx, th, args) -> {
+        environment.global.define(false, new NativeFunction("go", args -> {
             try {
                 var f = Path.of("do.js");
-                var func = _ctx.compile(new Filename("do", "do/" + j++ + ".js"), new String(Files.readAllBytes(f)));
-                return func.call(_ctx);
+                var func = args.ctx.compile(new Filename("do", "do/" + j++ + ".js"), new String(Files.readAllBytes(f)));
+                return func.call(args.ctx);
             }
             catch (IOException e) {
                 throw new EngineException("Couldn't open do.js");
@@ -119,7 +119,7 @@ public class Main {
     }
     private static void initEngine() {
         var ctx = new DebugContext();
-        // engine.globalEnvironment.add(DebugContext.ENV_KEY, ctx);
+        engine.globalEnvironment.add(DebugContext.ENV_KEY, ctx);
 
         debugServer.targets.put("target", (ws, req) -> new SimpleDebugger(ws).attach(ctx));
         engineTask = engine.start();

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

@@ -5,6 +5,7 @@ import java.util.stream.Collectors;
 
 import me.topchetoeu.jscript.Filename;
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.engine.debug.DebugContext;
 import me.topchetoeu.jscript.engine.scope.GlobalScope;
 import me.topchetoeu.jscript.engine.values.ArrayValue;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
@@ -16,7 +17,6 @@ import me.topchetoeu.jscript.exceptions.EngineException;
 import me.topchetoeu.jscript.interop.NativeWrapperProvider;
 import me.topchetoeu.jscript.parsing.Parsing;
 
-// TODO: Remove hardcoded extensions form environment
 @SuppressWarnings("unchecked")
 public class Environment implements Extensions {
 
@@ -64,31 +64,31 @@ public class Environment implements Extensions {
     }
 
     public static FunctionValue compileFunc(Extensions ext) {
-        return ext.init(COMPILE_FUNC, new NativeFunction("compile", (ctx, thisArg, args) -> {
-            var source = Values.toString(ctx, args[0]);
-            var filename = Values.toString(ctx, args[1]);
-            var isDebug = Values.toBoolean(args[2]);
-
-            var env = Values.wrapper(Values.getMember(ctx, args[2], Symbol.get("env")), Environment.class);
+        return ext.init(COMPILE_FUNC, new NativeFunction("compile", args -> {
+            var source = args.getString(0);
+            var filename = args.getString(1);
+            var env = Values.wrapper(args.get(2, ObjectValue.class).getMember(args.ctx, Symbol.get("env")), Environment.class);
+            var isDebug = args.ctx.has(DebugContext.ENV_KEY);
             var res = new ObjectValue();
 
             var target = Parsing.compile(env, Filename.parse(filename), source);
             Engine.functions.putAll(target.functions);
             Engine.functions.remove(0l);
 
-            res.defineProperty(ctx, "function", target.func(env));
-            res.defineProperty(ctx, "mapChain", new ArrayValue());
+            res.defineProperty(args.ctx, "function", target.func(env));
+            res.defineProperty(args.ctx, "mapChain", new ArrayValue());
 
-            if (isDebug) {
-                res.defineProperty(ctx, "breakpoints", ArrayValue.of(ctx, target.breakpoints.stream().map(Location::toString).collect(Collectors.toList())));
-            }
+            if (isDebug) res.defineProperty(
+                args.ctx, "breakpoints",
+                ArrayValue.of(args.ctx, target.breakpoints.stream().map(Location::toString).collect(Collectors.toList()))
+            );
 
             return res;
         }));
     }
     public static FunctionValue regexConstructor(Extensions ext) {
-        return ext.init(COMPILE_FUNC, new NativeFunction("RegExp", (ctx, thisArg, args) -> {
-            throw EngineException.ofError("Regular expressions not supported.").setCtx(ctx.environment, ctx.engine);
+        return ext.init(COMPILE_FUNC, new NativeFunction("RegExp", args -> {
+            throw EngineException.ofError("Regular expressions not supported.").setCtx(args.ctx.environment, args.ctx.engine);
         }));
     }
 

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

@@ -35,8 +35,8 @@ public class GlobalScope implements ScopeRecord {
     }
     public void define(String name, Variable val) {
         obj.defineProperty(null, name,
-            new NativeFunction("get " + name, (ctx, th, a) -> val.get(ctx)),
-            new NativeFunction("set " + name, (ctx, th, args) -> { val.set(ctx, args.length > 0 ? args[0] : null); return null; }),
+            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
         );
     }

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

@@ -1,17 +1,18 @@
 package me.topchetoeu.jscript.engine.values;
 
 import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.interop.Arguments;
 
 public class NativeFunction extends FunctionValue {
     public static interface NativeFunctionRunner {
-        Object run(Context ctx, Object thisArg, Object[] args);
+        Object run(Arguments args);
     }
 
     public final NativeFunctionRunner action;
 
     @Override
     public Object call(Context ctx, Object thisArg, Object ...args) {
-        return action.run(ctx, thisArg, args);
+        return action.run(new Arguments(ctx, thisArg, args));
     }
 
     public NativeFunction(String name, NativeFunctionRunner action) {

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

@@ -523,6 +523,9 @@ public class Values {
             );
             return (T)res;
         }
+        if (clazz.isAssignableFrom(NativeWrapper.class)) {
+            return (T)new NativeWrapper(obj);
+        }
 
         if (clazz == String.class) return (T)toString(ctx, obj);
         if (clazz == Boolean.class || clazz == Boolean.TYPE) return (T)(Boolean)toBoolean(obj);
@@ -606,15 +609,15 @@ public class Values {
 
         try {
             var key = getMember(ctx, getMember(ctx, ctx.get(Environment.SYMBOL_PROTO), "constructor"), "iterator");
-            res.defineProperty(ctx, key, new NativeFunction("", (_ctx, thisArg, args) -> thisArg));
+            res.defineProperty(ctx, key, new NativeFunction("", args -> args.thisArg));
         }
         catch (IllegalArgumentException | NullPointerException e) { }
 
-        res.defineProperty(ctx, "next", new NativeFunction("", (_ctx, _th, _args) -> {
+        res.defineProperty(ctx, "next", new NativeFunction("", args -> {
             if (!it.hasNext()) return new ObjectValue(ctx, Map.of("done", true));
             else {
                 var obj = new ObjectValue();
-                obj.defineProperty(_ctx, "value", it.next());
+                obj.defineProperty(args.ctx, "value", it.next());
                 return obj;
             }
         }));
@@ -631,16 +634,16 @@ public class Values {
 
         try {
             var key = getMemberPath(ctx, ctx.get(Environment.SYMBOL_PROTO), "constructor", "asyncIterator");
-            res.defineProperty(ctx, key, new NativeFunction("", (_ctx, thisArg, args) -> thisArg));
+            res.defineProperty(ctx, key, new NativeFunction("", args -> args.thisArg));
         }
         catch (IllegalArgumentException | NullPointerException e) { }
 
-        res.defineProperty(ctx, "next", new NativeFunction("", (_ctx, _th, _args) -> {
+        res.defineProperty(ctx, "next", new NativeFunction("", args -> {
             return PromiseLib.await(ctx, () -> {
                 if (!it.hasNext()) return new ObjectValue(ctx, Map.of("done", true));
                 else {
                     var obj = new ObjectValue();
-                    obj.defineProperty(_ctx, "value", it.next());
+                    obj.defineProperty(args.ctx, "value", it.next());
                     return obj;
                 }
             });

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

@@ -0,0 +1,95 @@
+package me.topchetoeu.jscript.interop;
+
+import java.lang.reflect.Array;
+
+import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.engine.values.NativeWrapper;
+import me.topchetoeu.jscript.engine.values.Values;
+
+public class Arguments {
+    public final Object thisArg;
+    public final Object[] args;
+    public final Context ctx;
+
+    public <T> T get(int i, Class<T> type) {
+        return Values.convert(ctx, get(i), type);
+    }
+    public Object get(int i, boolean unwrap) {
+        Object res = null;
+
+        if (i == -1) res = thisArg;
+        if (i >= 0 && i < args.length) res = args[i];
+        if (unwrap && res instanceof NativeWrapper) res = ((NativeWrapper)res).wrapped;
+
+        return res;
+    }
+    public Object get(int i) {
+        return get(i, false);
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T> T[] slice(int i, Class<T> type) {
+        var res = Array.newInstance(type, Math.max(0, args.length - i));
+        for (; i < args.length; i++) Array.set(res, i - args.length, get(i, type));
+        return ((T[])res);
+    }
+    public Object slice(int i, boolean unwrap) {
+        var res = new Object[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, unwrap);
+        return res;
+    }
+    public Object slice(int i) {
+        return slice(i, false);
+    }
+
+    public int[] sliceInt(int i) {
+        var res = new int[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Integer.class);
+        return res;
+    }
+    public long[] sliceLong(int i) {
+        var res = new long[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Long.class);
+        return res;
+    }
+    public short[] sliceShort(int i) {
+        var res = new short[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Short.class);
+        return res;
+    }
+    public float[] sliceFloat(int i) {
+        var res = new float[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Float.class);
+        return res;
+    }
+    public double[] sliceDouble(int i) {
+        var res = new double[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Double.class);
+        return res;
+    }
+    public byte[] sliceByte(int i) {
+        var res = new byte[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Byte.class);
+        return res;
+    }
+    public char[] sliceChar(int i) {
+        var res = new char[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Character.class);
+        return res;
+    }
+    public boolean[] sliceBool(int i) {
+        var res = new boolean[Math.max(0, args.length - i)];
+        for (; i < args.length; i++) res[i - args.length] = get(i, Boolean.class);
+        return res;
+    }
+
+    public String getString(int i) { return Values.toString(ctx, get(i)); }
+    public boolean getBoolean(int i) { return Values.toBoolean(get(i)); }
+    public int getInt(int i) { return (int)Values.toNumber(ctx, get(i)); }
+
+    public Arguments(Context ctx, Object thisArg, Object... args) {
+        this.ctx = ctx;
+        this.args = args;
+        this.thisArg = thisArg;
+    }
+}

src/me/topchetoeu/jscript/interop/Expose.java

@@ -7,7 +7,8 @@ import java.lang.annotation.Target;
 
 @Target({ ElementType.METHOD })
 @Retention(RetentionPolicy.RUNTIME)
-public @interface NativeSetter {
+public @interface Expose {
     public String value() default "";
-    public boolean thisArg() default false;
+    public ExposeType type() default ExposeType.METHOD;
+    public ExposeTarget target() default ExposeTarget.MEMBER;
 }

src/me/topchetoeu/jscript/interop/ExposeConstructor.java

@@ -7,7 +7,4 @@ import java.lang.annotation.Target;
 
 @Target({ ElementType.METHOD })
 @Retention(RetentionPolicy.RUNTIME)
-public @interface NativeConstructor {
-    public boolean thisArg() default false;
-}
-
+public @interface ExposeConstructor { }

src/me/topchetoeu/jscript/interop/ExposeTarget.java

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.interop;
+
+public enum ExposeTarget {
+    STATIC(true, true, false),
+    MEMBER(false, false, true),
+    NAMESPACE(false, true, false),
+    CONSTRUCTOR(true, false, false),
+    PROTOTYPE(false, false, true),
+    ALL(true, true, true);
+
+    public final boolean constructor;
+    public final boolean namespace;
+    public final boolean prototype;
+
+    public boolean shouldApply(ExposeTarget other) {
+        if (other.constructor && !constructor) return false;
+        if (other.namespace && !namespace) return false;
+        if (other.prototype && !prototype) return false;
+
+        return true;
+    }
+
+    private ExposeTarget(boolean constructor, boolean namespace, boolean prototype) {
+        this.constructor = constructor;
+        this.namespace = namespace;
+        this.prototype = prototype;
+    }
+}

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

@@ -0,0 +1,9 @@
+package me.topchetoeu.jscript.interop;
+
+public enum ExposeType {
+    INIT,
+    METHOD,
+    FIELD,
+    GETTER,
+    SETTER,
+}

src/me/topchetoeu/jscript/interop/InitType.java

@@ -1,7 +0,0 @@
-package me.topchetoeu.jscript.interop;
-
-public enum InitType {
-    CONSTRUCTOR,
-    PROTOTYPE,
-    NAMESPACE,
-}

src/me/topchetoeu/jscript/interop/Native.java

@@ -1,13 +0,0 @@
-package me.topchetoeu.jscript.interop;
-
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
-@Target({ ElementType.METHOD, ElementType.FIELD, ElementType.CONSTRUCTOR, ElementType.TYPE })
-@Retention(RetentionPolicy.RUNTIME)
-public @interface Native {
-    public String value() default "";
-    public boolean thisArg() default false;
-}

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

@@ -1,16 +1,23 @@
 package me.topchetoeu.jscript.interop;
 
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.HashSet;
 
+import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.engine.Context;
 import me.topchetoeu.jscript.engine.Environment;
 import me.topchetoeu.jscript.engine.WrappersProvider;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.engine.values.NativeFunction;
 import me.topchetoeu.jscript.engine.values.ObjectValue;
 import me.topchetoeu.jscript.engine.values.Symbol;
+import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.exceptions.EngineException;
-import me.topchetoeu.jscript.exceptions.UncheckedException;
+import me.topchetoeu.jscript.exceptions.InterruptException;
 
 public class NativeWrapperProvider implements WrappersProvider {
     private final HashMap<Class<?>, FunctionValue> constructors = new HashMap<>();
@@ -18,125 +25,153 @@ public class NativeWrapperProvider implements WrappersProvider {
     private final HashMap<Class<?>, ObjectValue> namespaces = new HashMap<>();
     private final Environment env;
 
-    private static void applyMethods(Environment env, boolean member, ObjectValue target, Class<?> clazz) {
-        for (var method : clazz.getDeclaredMethods()) {
-            var nat = method.getAnnotation(Native.class);
-            var get = method.getAnnotation(NativeGetter.class);
-            var set = method.getAnnotation(NativeSetter.class);
-            var memberMatch = !Modifier.isStatic(method.getModifiers()) == member;
-
-            if (nat != null) {
-                if (nat.thisArg() && !member || !nat.thisArg() && !memberMatch) continue;
-
-                Object name = nat.value();
-                if (name.toString().startsWith("@@")) name = Symbol.get(name.toString().substring(2));
-                else if (name.equals("")) name = method.getName();
-
-                var val = target.values.get(name);
-
-                if (!(val instanceof OverloadFunction)) target.defineProperty(null, name, val = new OverloadFunction(name.toString()), true, true, false);
-
-                ((OverloadFunction)val).add(Overload.fromMethod(method, nat.thisArg()));
+    private static Object call(Context ctx, String name, Method method, Object thisArg, Object... args) {
+        try {
+            var realArgs = new Object[method.getParameterCount()];
+            System.arraycopy(args, 0, realArgs, 0, realArgs.length);
+            if (Modifier.isStatic(method.getModifiers())) thisArg = null;
+            return Values.normalize(ctx, method.invoke(Values.convert(ctx, thisArg, method.getDeclaringClass()), realArgs));
+        }
+        catch (InvocationTargetException e) {
+            if (e.getTargetException() instanceof EngineException) {
+                throw ((EngineException)e.getTargetException()).add(ctx, name, Location.INTERNAL);
             }
-            else {
-                if (get != null) {
-                    if (get.thisArg() && !member || !get.thisArg() && !memberMatch) continue;
-
-                    Object name = get.value();
-                    if (name.toString().startsWith("@@")) name = Symbol.get(name.toString().substring(2));
-                    else if (name.equals("")) name = method.getName();
-
-                    var prop = target.properties.get(name);
-                    OverloadFunction getter = null;
-                    var setter = prop == null ? null : prop.setter;
-
-                    if (prop != null && prop.getter instanceof OverloadFunction) getter = (OverloadFunction)prop.getter;
-                    else getter = new OverloadFunction("get " + name);
-
-                    getter.add(Overload.fromMethod(method, get.thisArg()));
-                    target.defineProperty(null, name, getter, setter, true, false);
-                }
-                if (set != null) {
-                    if (set.thisArg() && !member || !set.thisArg() && !memberMatch) continue;
-
-                    Object name = set.value();
-                    if (name.toString().startsWith("@@")) name = Symbol.get(name.toString().substring(2));
-                    else if (name.equals("")) name = method.getName();
-
-                    var prop = target.properties.get(name);
-                    var getter = prop == null ? null : prop.getter;
-                    OverloadFunction setter = null;
-
-                    if (prop != null && prop.setter instanceof OverloadFunction) setter = (OverloadFunction)prop.setter;
-                    else setter = new OverloadFunction("set " + name);
-
-                    setter.add(Overload.fromMethod(method, set.thisArg()));
-                    target.defineProperty(null, name, getter, setter, true, false);
-                }
+            else if (e.getTargetException() instanceof NullPointerException) {
+                e.printStackTrace();
+                throw EngineException.ofType("Unexpected value of 'undefined'.").add(ctx, name, Location.INTERNAL);
             }
+            else if (e.getTargetException() instanceof InterruptException || e.getTargetException() instanceof InterruptedException) {
+                throw new InterruptException();
+            }
+            else throw new EngineException(e.getTargetException()).add(ctx, name, Location.INTERNAL);
+        }
+        catch (ReflectiveOperationException e) {
+            throw EngineException.ofError(e.getMessage()).add(ctx, name, Location.INTERNAL);
         }
     }
-    private static void applyFields(Environment env, boolean member, ObjectValue target, Class<?> clazz) {
-        for (var field : clazz.getDeclaredFields()) {
-            if (!Modifier.isStatic(field.getModifiers()) != member) continue;
-            var nat = field.getAnnotation(Native.class);
+    private static FunctionValue create(String name, Method method) {
+        return new NativeFunction(name, args -> call(args.ctx, name, method, args.thisArg, args));
+    }
+    private static void checkSignature(Method method, boolean forceStatic, Class<?> ...params) {
+        if (forceStatic && !Modifier.isStatic(method.getModifiers())) throw new IllegalArgumentException(String.format(
+            "Method %s must be static.",
+            method.getDeclaringClass().getName() + "." + method.getName()
+        ));
 
-            if (nat != null) {
-                Object name = nat.value();
-                if (name.toString().startsWith("@@")) name = Symbol.get(name.toString().substring(2));
-                else if (name.equals("")) name = field.getName();
-    
-                var getter = OverloadFunction.of("get " + name, Overload.getterFromField(field));
-                var setter = OverloadFunction.of("set " + name, Overload.setterFromField(field));
-                target.defineProperty(null, name, getter, setter, true, false);
+        var actual = method.getParameterTypes();
+
+        boolean failed = actual.length > params.length;
+
+        if (!failed) for (var i = 0; i < actual.length; i++) {
+            if (!actual[i].isAssignableFrom(params[i])) {
+                failed = true;
+                break;
             }
         }
+
+        if (failed) throw new IllegalArgumentException(String.format(
+            "Method %s was expected to have a signature of '%s', found '%s' instead.",
+            method.getDeclaringClass().getName() + "." + method.getName(),
+            String.join(", ", Arrays.stream(params).map(v -> v.getName()).toList()),
+            String.join(", ", Arrays.stream(actual).map(v -> v.getName()).toList())
+        ));
     }
-    private static void applyClasses(Environment env, boolean member, ObjectValue target, Class<?> clazz) {
-        for (var cl : clazz.getDeclaredClasses()) {
-            if (!Modifier.isStatic(cl.getModifiers()) != member) continue;
-            var nat = cl.getAnnotation(Native.class);
-
-            if (nat != null) {
-                Object name = nat.value();
-                if (name.toString().startsWith("@@")) name = Symbol.get(name.toString().substring(2));
-                else if (name.equals("")) name = cl.getName();
-
-                var getter = new NativeFunction("get " + name, (ctx, thisArg, args) -> cl);
-
-                target.defineProperty(null, name, getter, null, true, false);
-            }
-        }
-    }
-
-    public static String getName(Class<?> clazz) {
-        var classNat = clazz.getAnnotation(Native.class);
+    private static String getName(Class<?> clazz) {
+        var classNat = clazz.getAnnotation(WrapperName.class);
         if (classNat != null && !classNat.value().trim().equals("")) return classNat.value().trim();
         else return clazz.getSimpleName();
     }
 
+    private static void apply(ObjectValue obj, Environment env, 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>();
+
+        for (var method : clazz.getDeclaredMethods()) {
+            for (var annotation : method.getAnnotationsByType(Expose.class)) {
+                if (!annotation.target().shouldApply(target)) continue;
+
+                Object key = annotation.value();
+                if (key.toString().startsWith("@@")) key = Symbol.get(key.toString().substring(2));
+                else if (key.equals("")) key = method.getName();
+                var name = key.toString();
+
+                var repeat = false;
+
+                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 FIELD:
+                        if (props.contains(key) || nonProps.contains(key)) repeat = true;
+                        else {
+                            checkSignature(method, true, Environment.class);
+                            obj.defineProperty(null, key, call(new Context(null, env), name, method, null, env));
+                            nonProps.add(key);
+                        }
+                        break;
+                    case METHOD:
+                        if (props.contains(key) || nonProps.contains(key)) repeat = true;
+                        else {
+                            checkSignature(method, false, Arguments.class);
+                            obj.defineProperty(null, key, create(name, method));
+                            nonProps.add(key);
+                        }
+                        break;
+                    case GETTER:
+                        if (nonProps.contains(key) || getters.containsKey(key)) repeat = true;
+                        else {
+                            checkSignature(method, false, Arguments.class);
+                            getters.put(key, create(name, method));
+                            props.add(key);
+                        }
+                        break;
+                    case SETTER:
+                        if (nonProps.contains(key) || setters.containsKey(key)) repeat = true;
+                        else {
+                            checkSignature(method, false, Arguments.class);
+                            setters.put(key, create(name, method));
+                            props.add(key);
+                        }
+                        break;
+                }
+
+                if (repeat)
+                    throw new IllegalArgumentException(String.format(
+                    "A member '%s' in the wrapper for '%s' of type '%s' is already present.",
+                    name, clazz.getName(), target.toString()
+                ));
+            }
+        }
+
+        for (var key : props) obj.defineProperty(null, key, getters.get(key), setters.get(key), true, true);
+    }
+
+    private static Method getConstructor(Environment env, Class<?> clazz) {
+        for (var method : clazz.getDeclaredMethods()) {
+            if (!method.isAnnotationPresent(ExposeConstructor.class)) continue;
+            checkSignature(method, true, Arguments.class);
+            return method;
+        }
+
+        return null;
+    }
+
     /**
      * Generates a prototype for the given class.
      * The returned object will have appropriate wrappers for all instance members.
      * 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 ctx, Class<?> clazz) {
+    public static ObjectValue makeProto(Environment env, Class<?> clazz) {
         var res = new ObjectValue();
-
         res.defineProperty(null, Symbol.get("Symbol.typeName"), getName(clazz));
-
-        for (var overload : clazz.getDeclaredMethods()) {
-            var init = overload.getAnnotation(NativeInit.class);
-            if (init == null || init.value() != InitType.PROTOTYPE) continue;
-            try { overload.invoke(null, ctx, res); }
-            catch (Throwable e) { throw new UncheckedException(e); }
-        }
-
-        applyMethods(ctx, true, res, clazz);
-        applyFields(ctx, true, res, clazz);
-        applyClasses(ctx, true, res, clazz);
-
+        apply(res, env, ExposeTarget.PROTOTYPE, clazz);
         return res;
     }
     /**
@@ -146,36 +181,15 @@ public class NativeWrapperProvider implements WrappersProvider {
      * @param clazz The class for which a constructor should be generated
      */
     public static FunctionValue makeConstructor(Environment ctx, Class<?> clazz) {
-        FunctionValue func = new OverloadFunction(getName(clazz));
+        var constr = getConstructor(ctx, clazz);
 
-        for (var overload : clazz.getDeclaredConstructors()) {
-            var nat = overload.getAnnotation(Native.class);
-            if (nat == null) continue;
-            ((OverloadFunction)func).add(Overload.fromConstructor(overload, nat.thisArg()));
-        }
-        for (var overload : clazz.getDeclaredMethods()) {
-            var constr = overload.getAnnotation(NativeConstructor.class);
-            if (constr == null) continue;
-            ((OverloadFunction)func).add(Overload.fromMethod(overload, constr.thisArg()));
-        }
-        for (var overload : clazz.getDeclaredMethods()) {
-            var init = overload.getAnnotation(NativeInit.class);
-            if (init == null || init.value() != InitType.CONSTRUCTOR) continue;
-            try { overload.invoke(null, ctx, func); }
-            catch (Throwable e) { throw new UncheckedException(e); }
-        }
+        FunctionValue res = constr == null ?
+            new NativeFunction(getName(clazz), args -> { throw EngineException.ofError("This constructor is not invokable."); }) :
+            create(getName(clazz), constr);
 
-        if (((OverloadFunction)func).overloads.size() == 0) {
-            func = new NativeFunction(getName(clazz), (a, b, c) -> { throw EngineException.ofError("This constructor is not invokable."); });
-        }
+        apply(res, ctx, ExposeTarget.CONSTRUCTOR, clazz);
 
-        applyMethods(ctx, false, func, clazz);
-        applyFields(ctx, false, func, clazz);
-        applyClasses(ctx, false, func, clazz);
-
-        func.special = true;
-
-        return func;
+        return res;
     }
     /**
      * Generates a namespace for the given class.
@@ -184,19 +198,9 @@ public class NativeWrapperProvider implements WrappersProvider {
      * @param clazz The class for which a constructor should be generated
      */
     public static ObjectValue makeNamespace(Environment ctx, Class<?> clazz) {
-        ObjectValue res = new ObjectValue();
-
-        for (var overload : clazz.getDeclaredMethods()) {
-            var init = overload.getAnnotation(NativeInit.class);
-            if (init == null || init.value() != InitType.NAMESPACE) continue;
-            try { overload.invoke(null, ctx, res); }
-            catch (Throwable e) { throw new UncheckedException(e); }
-        }
-
-        applyMethods(ctx, false, res, clazz);
-        applyFields(ctx, false, res, clazz);
-        applyClasses(ctx, false, res, clazz);
-
+        var res = new ObjectValue();
+        res.defineProperty(null, Symbol.get("Symbol.typeName"), getName(clazz));
+        apply(res, ctx, ExposeTarget.NAMESPACE, clazz);
         return res;
     }
 
@@ -249,8 +253,7 @@ public class NativeWrapperProvider implements WrappersProvider {
         return constructors.get(clazz);
     }
 
-    @Override
-    public WrappersProvider fork(Environment env) {
+    @Override public WrappersProvider fork(Environment env) {
         return new NativeWrapperProvider(env);
     }
 
@@ -263,12 +266,12 @@ public class NativeWrapperProvider implements WrappersProvider {
 
     private void initError() {
         var proto = new ObjectValue();
-        proto.defineProperty(null, "message", new NativeFunction("message", (ctx, thisArg, args) -> {
-            if (thisArg instanceof Throwable) return ((Throwable)thisArg).getMessage();
+        proto.defineProperty(null, "message", new NativeFunction("message", args -> {
+            if (args.thisArg instanceof Throwable) return ((Throwable)args.thisArg).getMessage();
             else return null;
         }));
-        proto.defineProperty(null, "name", new NativeFunction("name", (ctx, thisArg, args) -> getName(thisArg.getClass())));
-        proto.defineProperty(null, "toString", new NativeFunction("toString", (ctx, thisArg, args) -> thisArg.toString()));
+        proto.defineProperty(null, "name", new NativeFunction("name", args -> getName(args.thisArg.getClass())));
+        proto.defineProperty(null, "toString", new NativeFunction("toString", args -> args.thisArg.toString()));
 
         var constr = makeConstructor(null, Throwable.class);
         proto.defineProperty(null, "constructor", constr, true, false, false);

src/me/topchetoeu/jscript/interop/OnWrapperInit.java

@@ -7,6 +7,6 @@ import java.lang.annotation.Target;
 
 @Target({ ElementType.METHOD })
 @Retention(RetentionPolicy.RUNTIME)
-public @interface NativeInit {
-    InitType value();
+public @interface OnWrapperInit {
+    
 }

src/me/topchetoeu/jscript/interop/Overload.java

@@ -1,70 +0,0 @@
-package me.topchetoeu.jscript.interop;
-
-import java.lang.reflect.Constructor;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
-
-import me.topchetoeu.jscript.engine.Context;
-
-public class Overload {
-    public static interface OverloadRunner {
-        Object run(Context ctx, Object thisArg, Object[] args) throws ReflectiveOperationException, IllegalArgumentException;
-    }
-
-    public final OverloadRunner runner;
-    public final boolean variadic;
-    public final boolean passThis;
-    public final Class<?> thisArg;
-    public final Class<?>[] params;
-
-    public static Overload fromMethod(Method method, boolean passThis) {
-        return new Overload(
-            (ctx, th, args) -> method.invoke(th, args),
-            method.isVarArgs(), passThis,
-            Modifier.isStatic(method.getModifiers()) ? null : method.getDeclaringClass(),
-            method.getParameterTypes()
-        );
-    }
-    public static Overload fromConstructor(Constructor<?> method, boolean passThis) {
-        return new Overload(
-            (ctx, th, args) -> method.newInstance(args),
-            method.isVarArgs(), passThis,
-            null,
-            method.getParameterTypes()
-        );
-    }
-    public static Overload getterFromField(Field field) {
-        return new Overload(
-            (ctx, th, args) -> field.get(th), false, false,
-            Modifier.isStatic(field.getModifiers()) ? null : field.getDeclaringClass(),
-            new Class[0]
-        );
-    }
-    public static Overload setterFromField(Field field) {
-        if (Modifier.isFinal(field.getModifiers())) return null;
-        return new Overload(
-            (ctx, th, args) -> {
-                field.set(th, args[0]); return null;
-            }, false, false,
-            Modifier.isStatic(field.getModifiers()) ? null : field.getDeclaringClass(),
-            new Class[] { field.getType() }
-        );
-    }
-
-    public static Overload getter(Class<?> thisArg, OverloadRunner runner, boolean passThis) {
-        return new Overload(
-            (ctx, th, args) -> runner.run(ctx, th, args), false, passThis,
-            thisArg,
-            new Class[0]
-        );
-    }
-
-    public Overload(OverloadRunner runner, boolean variadic, boolean passThis, Class<?> thisArg, Class<?> args[]) {
-        this.runner = runner;
-        this.variadic = variadic;
-        this.passThis = passThis;
-        this.thisArg = thisArg;
-        this.params = args;
-    }
-}

src/me/topchetoeu/jscript/interop/OverloadFunction.java

@@ -1,127 +0,0 @@
-package me.topchetoeu.jscript.interop;
-
-import java.lang.reflect.Array;
-import java.lang.reflect.InvocationTargetException;
-import java.util.ArrayList;
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.engine.Context;
-import me.topchetoeu.jscript.engine.values.FunctionValue;
-import me.topchetoeu.jscript.engine.values.NativeWrapper;
-import me.topchetoeu.jscript.engine.values.Values;
-import me.topchetoeu.jscript.exceptions.ConvertException;
-import me.topchetoeu.jscript.exceptions.EngineException;
-import me.topchetoeu.jscript.exceptions.InterruptException;
-
-public class OverloadFunction extends FunctionValue {
-    public final List<Overload> overloads = new ArrayList<>();
-
-    public Object call(Context ctx, Object thisArg, Object ...args) {
-        loop: for (var overload : overloads) {
-            Object[] newArgs = new Object[overload.params.length];
-
-            boolean consumesEngine = overload.params.length > 0 && overload.params[0] == Context.class;
-            int start = (consumesEngine ? 1 : 0) + (overload.passThis ? 1 : 0);
-            int end = overload.params.length - (overload.variadic ? 1 : 0);
-
-            for (var i = start; i < end; i++) {
-                Object val;
-
-                if (i - start >= args.length) val = null;
-                else val = args[i - start];
-
-                try {
-                    newArgs[i] = Values.convert(ctx, val, overload.params[i]);
-                }
-                catch (ConvertException e) {
-                    if (overloads.size() > 1) continue loop;
-                    else throw EngineException.ofType(String.format("Argument %d can't be converted from %s to %s", i - start, e.source, e.target));
-                }
-            }
-
-            if (overload.variadic) {
-                var type = overload.params[overload.params.length - 1].getComponentType();
-                var n = Math.max(args.length - end + start, 0);
-                Object varArg = Array.newInstance(type, n);
-
-                for (var i = 0; i < n; i++) {
-                    try {
-                        Array.set(varArg, i, Values.convert(ctx, args[i + end - start], type));
-                    }
-                    catch (ConvertException e) {
-                        if (overloads.size() > 1) continue loop;
-                        else throw EngineException.ofType(String.format("Element in variadic argument can't be converted from %s to %s", e.source, e.target));
-                    }
-                }
-
-                newArgs[newArgs.length - 1] = varArg;
-            }
-
-            var thisArgType = overload.passThis ? overload.params[consumesEngine ? 1 : 0] : overload.thisArg;
-            Object _this;
-
-            try {
-                _this = thisArgType == null ? null : Values.convert(ctx, thisArg, thisArgType);
-            }
-            catch (ConvertException e) {
-                if (overloads.size() > 1) continue loop;
-                else throw EngineException.ofType(String.format("This argument can't be converted from %s to %s", e.source, e.target));
-            }
-
-            if (consumesEngine) newArgs[0] = ctx;
-            if (overload.passThis) {
-                newArgs[consumesEngine ? 1 : 0] = _this;
-                _this = null;
-            }
-
-            try {
-                return Values.normalize(ctx, overload.runner.run(ctx, _this, newArgs));
-            }
-            catch (InstantiationException e) { throw EngineException.ofError("The class may not be instantiated."); }
-            catch (IllegalAccessException | IllegalArgumentException e) { continue; }
-            catch (InvocationTargetException e) {
-                var loc = Location.INTERNAL;
-                if (e.getTargetException() instanceof EngineException) {
-                    throw ((EngineException)e.getTargetException()).add(ctx, name, loc);
-                }
-                else if (e.getTargetException() instanceof NullPointerException) {
-                    e.printStackTrace();
-                    throw EngineException.ofType("Unexpected value of 'undefined'.").add(ctx, name, loc);
-                }
-                else if (e.getTargetException() instanceof InterruptException || e.getTargetException() instanceof InterruptedException) {
-                    throw new InterruptException();
-                }
-                else {
-                    var target = e.getTargetException();
-                    var targetClass = target.getClass();
-                    var err = new NativeWrapper(e.getTargetException());
-
-                    err.defineProperty(ctx, "message", target.getMessage());
-                    err.defineProperty(ctx, "name", NativeWrapperProvider.getName(targetClass));
-
-                    throw new EngineException(err).add(ctx, name, loc);
-                }
-            }
-            catch (ReflectiveOperationException e) {
-                throw EngineException.ofError(e.getMessage()).add(ctx, name, Location.INTERNAL);
-            }
-        }
-
-        throw EngineException.ofType("No overload found for native method.");
-    }
-
-    public OverloadFunction add(Overload overload) {
-        this.overloads.add(overload);
-        return this;
-    }
-
-    public OverloadFunction(String name) {
-        super(name, 0);
-    }
-
-    public static OverloadFunction of(String name, Overload overload) {
-        if (overload == null) return null;
-        else return new OverloadFunction(name).add(overload);
-    }
-}

src/me/topchetoeu/jscript/interop/WrapperName.java

@@ -5,9 +5,8 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target({ ElementType.METHOD })
+@Target({ ElementType.TYPE })
 @Retention(RetentionPolicy.RUNTIME)
-public @interface NativeGetter {
-    public String value() default "";
-    public boolean thisArg() default false;
+public @interface WrapperName {
+    String value();
 }