feat: implement symbols in java

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

@@ -14,7 +14,7 @@ import me.topchetoeu.jscript.interop.Native;
 public class Internals {
     public final Environment targetEnv;
 
-    @Native public final FunctionValue object, function, promise, array, bool, number, string, map, set;
+    @Native public final FunctionValue object, function, promise, array, bool, number, string, symbol, map, set;
 
     @Native public void markSpecial(FunctionValue ...funcs) {
         for (var func : funcs) {
@@ -72,7 +72,7 @@ public class Internals {
 
         return stringFromChars(res);
     }
-    @Native public Symbol symbol(String str) {
+    @Native public Symbol getSymbol(String str) {
         return new Symbol(str);
     }
     @Native public String symbolToString(Symbol str) {
@@ -160,6 +160,7 @@ public class Internals {
         this.bool = targetEnv.wrappersProvider.getConstr(BooleanPolyfill.class);
         this.number = targetEnv.wrappersProvider.getConstr(NumberPolyfill.class);
         this.string = targetEnv.wrappersProvider.getConstr(StringPolyfill.class);
+        this.symbol = targetEnv.wrappersProvider.getConstr(SymbolPolyfill.class);
         this.map = targetEnv.wrappersProvider.getConstr(MapPolyfill.class);
         this.set = targetEnv.wrappersProvider.getConstr(SetPolyfill.class);
     }

src/me/topchetoeu/jscript/polyfills/SymbolPolyfill.java

@@ -0,0 +1,69 @@
+package me.topchetoeu.jscript.polyfills;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import me.topchetoeu.jscript.engine.Context;
+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.interop.Native;
+import me.topchetoeu.jscript.interop.NativeConstructor;
+import me.topchetoeu.jscript.interop.NativeGetter;
+
+public class SymbolPolyfill {
+    private static final Map<String, Symbol> symbols = new HashMap<>();
+    @Native("@@Symbol.typeName") public final String name = "Symbol";
+
+    @NativeGetter public static Symbol typeName(Context ctx) { return ctx.env.symbol("Symbol.typeName"); }
+    @NativeGetter public static Symbol replace(Context ctx) { return ctx.env.symbol("Symbol.replace"); }
+    @NativeGetter public static Symbol match(Context ctx) { return ctx.env.symbol("Symbol.match"); }
+    @NativeGetter public static Symbol matchAll(Context ctx) { return ctx.env.symbol("Symbol.matchAll"); }
+    @NativeGetter public static Symbol split(Context ctx) { return ctx.env.symbol("Symbol.split"); }
+    @NativeGetter public static Symbol search(Context ctx) { return ctx.env.symbol("Symbol.search"); }
+    @NativeGetter public static Symbol iterator(Context ctx) { return ctx.env.symbol("Symbol.iterator"); }
+    @NativeGetter public static Symbol asyncIterator(Context ctx) { return ctx.env.symbol("Symbol.asyncIterator"); }
+
+    public final Symbol value;
+
+    private static Symbol passThis(String funcName, Object val) {
+        if (val instanceof SymbolPolyfill) return ((SymbolPolyfill)val).value;
+        else if (val instanceof Symbol) return (Symbol)val;
+        else throw EngineException.ofType(String.format("'%s' may only be called upon object and primitve symbols.", funcName));
+    }
+
+    @NativeConstructor(thisArg = true) public static Object constructor(Context ctx, Object thisArg, Object val) throws InterruptedException {
+        if (thisArg instanceof ObjectValue) throw EngineException.ofType("Symbol constructor may not be called with new.");
+        if (val == null) return new Symbol("");
+        else return new Symbol(Values.toString(ctx, val));
+    }
+    @Native(thisArg = true) public static String toString(Context ctx, Object thisArg) throws InterruptedException {
+        return passThis("toString", thisArg).value;
+    }
+    @Native(thisArg = true) public static Symbol valueOf(Context ctx, Object thisArg) throws InterruptedException {
+        return passThis("valueOf", thisArg);
+    }
+
+    @Native public static String fromCharCode(int ...val) {
+        char[] arr = new char[val.length];
+        for (var i = 0; i < val.length; i++) arr[i] = (char)val[i];
+        return new String(arr);
+    }
+
+    @Native("for") public static Symbol _for(String key) {
+        if (symbols.containsKey(key)) return symbols.get(key);
+        else {
+            var sym = new Symbol(key);
+            symbols.put(key, sym);
+            return sym;
+        }
+    }
+    @Native public static String keyFor(Symbol sym) {
+        return sym.value;
+    }
+
+    public SymbolPolyfill(Symbol val) {
+        this.value = val;
+    }
+}