InvocationMirror implemented in dart2js.

lib/compiler/implementation/lib/js_helper.dart

Index: lib/compiler/implementation/lib/js_helper.dart
diff --git a/lib/compiler/implementation/lib/js_helper.dart b/lib/compiler/implementation/lib/js_helper.dart
index e5476d45799af63c012c1651b46f318d88efaabe..89e6cabd277a38033850c45ed4e6b84443cfa7f9 100644
--- a/lib/compiler/implementation/lib/js_helper.dart
+++ b/lib/compiler/implementation/lib/js_helper.dart
@@ -352,6 +352,78 @@ class ListIterator<T> implements Iterator<T> {
   }
 }
 
+createInvocationMirror(name, internalName, type, arguments, argumentNames) =>
+    new JSInvocationMirror(name, internalName, type, arguments, argumentNames);
+
+class JSInvocationMirror implements InvocationMirror {
+  static const METHOD = 0;
+  static const GETTER = 1;
+  static const SETTER = 2;
+
+  final String memberName;
+  final String _internalName;
+  final int _type;

[ngeoffray, 2012/10/26 08:34:55]

Call it kind? Type is overloaded.

[Johnni Winther, 2012/10/26 10:18:01]

Done.

+  final List _arguments;
+  final List _namedArgumentNames;
+  /** Map from argument name to index in _arguments. */
+  Map<String,Dynamic> _namedIndices = null;

[ngeoffray, 2012/10/26 08:34:55]

space after comma (same in other places in this file).
Can we do Dynamic -> dynamic?

[Johnni Winther, 2012/10/26 10:18:01]

Done.

+
+  JSInvocationMirror(this.memberName,
+                     this._internalName,
+                     this._type,
+                     this._arguments,
+                     this._namedArgumentNames) {
+    if (_type == METHOD) {
+      if (_namedArgumentNames != null && _namedArgumentNames.length > 0) {
+        _namedIndices = <String,int>{};
+        int namedArgumentCount = _namedArgumentNames.length;
+        int namedArgumentsStartIndex =
+            _arguments.length - _namedArgumentNames.length;
+        for (int i = 0; i < namedArgumentCount; i++) {
+          _namedIndices[_namedArgumentNames[i]] = i + namedArgumentsStartIndex;
+        }
+      } else {
+        _namedIndices = const <String,int>{};
+      }
+    }
+  }
+
+  bool get isMethod => _type == METHOD;
+  bool get isGetter => _type == GETTER;
+  bool get isSetter => _type == SETTER;
+  bool get isAccessor => _type != METHOD;
+
+  List get positionalArguments {
+    if (_type == GETTER) return null;

[ngeoffray, 2012/10/26 08:34:55]

check isAccessor instead?

[Johnni Winther, 2012/10/26 10:18:01]

Done.

+    var list = [];
+    var argumentCount =
+        _arguments.length - _namedArgumentNames.length;
+    for (var index = 0 ; index < argumentCount ; index++) {
+      list.add(_arguments[index]);
+    }
+    return list;
+  }
+
+  Map<String,Dynamic> get namedArguments {
+    if (_type != METHOD) return null;
+    var map = <String,Dynamic>{};
+    _namedIndices.forEach((String name, int index) {
+      map[name] = _arguments[index];
+    });
+    return map;
+  }
+
+  // TODO(lrn): Hide subtype when class literals are implemented.
+  // Type get runtimeType => InvocationMirror;
+
+  invokeOn(Object object) {
+    List arguments = _arguments;
+    if (!isJsArray(arguments)) arguments = new List.from(arguments);
+    return JS("var", "#[#].apply(#, #)",
+              object, _internalName, object, arguments);
+  }
+}
+
 class Primitives {
   static int hashCodeSeed = 0;