dart:mirrors

tool/input_sdk/private/js_mirrors.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart._js_mirrors;
 
-getName(symbol) {
-  throw new UnimplementedError("MirrorSystem.getName unimplemented");
+import 'dart:collection';
+import 'dart:mirrors';
+import 'dart:_foreign_helper' show JS;
+import 'dart:_internal' as _internal;
+
+// TODO(vsm): This a workaround for:
+// https://github.com/dart-lang/dev_compiler/issues/219
+import 'dart:js';
+
+String getName(Symbol symbol) =>
+    _internal.Symbol.getName(symbol as _internal.Symbol);
+
+Symbol getSymbol(name, library) =>
+    throw new UnimplementedError("MirrorSystem.getSymbol unimplemented");
+
+final currentJsMirrorSystem = throw new UnimplementedError(
+    "MirrorSystem.currentJsMirrorSystem unimplemented");
+
+InstanceMirror reflect(reflectee) => new JsInstanceMirror._(reflectee);
+
+TypeMirror reflectType(Type key) {
+  // TODO(vsm): Might not be a class.
+  return new JsClassMirror._(key);
 }
 
-getSymbol(name, library) {
-  throw new UnimplementedError("MirrorSystem.getSymbol unimplemented");
+final dynamic _dart = JS('', 'dart');
+final _metadata = JS('', '#.metadata', _dart);
+
+dynamic _dload(obj, String name) {
+  return JS('', '#.dload(#, #)', _dart, obj, name);
 }
 
-final currentJsMirrorSystem =
-  throw new UnimplementedError(
-      "MirrorSystem.currentJsMirrorSystem unimplemented");
-
-
-reflect(reflectee) {
-  throw new UnimplementedError("MirrorSystem.reflect unimplemented");
+void _dput(obj, String name, val) {
+  JS('', '#.dput(#, #, #)', _dart, obj, name, val);
 }
 
-reflectType(Type key) {
-  throw new UnimplementedError("MirrorSystem.reflectType unimplemented");
+dynamic _dsend(obj, String name, List args) {
+  return JS('', '#.dsendArray(#, #, #)', _dart, obj, name, args);
 }
+
+class JsInstanceMirror implements InstanceMirror {
+  final Object reflectee;
+
+  JsInstanceMirror._(this.reflectee);
+
+  InstanceMirror getField(Symbol symbol) {
+    var name = getName(symbol);
+    var field = _dload(reflectee, name);
+    return new JsInstanceMirror._(field);
+  }
+
+  InstanceMirror setField(Symbol symbol, Object value) {
+    var name = getName(symbol);
+    var field = _dput(reflectee, name, value);
+    return new JsInstanceMirror._(field);
+  }
+
+  InstanceMirror invoke(Symbol symbol, List<dynamic> args,
+      [Map<Symbol, dynamic> namedArgs]) {
+    var name = getName(symbol);
+    if (namedArgs != null) {
+      args = new List.from(args);
+      args.add(_toJsMap(namedArgs));
+    }
+    var result = _dsend(reflectee, name, args);
+    return new JsInstanceMirror._(result);
+  }
+
+  dynamic _toJsMap(Map<Symbol, dynamic> map) {
+    var obj = JS('', '{}');
+    map.forEach((Symbol key, value) {
+      JS('', '#[#] = #', obj, getName(key), value);
+    });
+    return obj;
+  }
+}
+
+class JsClassMirror implements ClassMirror {
+  final Type _cls;
+  final Symbol simpleName;
+
+  List<InstanceMirror> _metadata;
+  Map<Symbol, MethodMirror> _declarations;
+
+  // TODO(vsm):These need to be immutable when escaping from this class.
+  List<InstanceMirror> get metadata => _metadata;
+  Map<Symbol, MethodMirror> get declarations => _declarations;
+
+  JsClassMirror._(Type cls)
+      : _cls = cls,
+        simpleName = new Symbol(JS('String', '#.name', cls)) {
+    // Load metadata.
+    var fn = JS('List<InstanceMirror>', '#[dart.metadata]', _cls);
+    _metadata = (fn == null)
+        ? <InstanceMirror>[]
+        : new List<InstanceMirror>.from(fn().map((i) => new JsInstanceMirror._(i)));
+
+    // Load declarations.
+    // FIXME(vsm): This is only populating the default constructor right now.

[Jennifer Messerly, 2015/06/15 21:40:17]

not a big deal but ... we usually use TODO instead of FIXME.

[vsm, 2015/06/15 22:46:47]

Done.

+    _declarations = new Map<Symbol, MethodMirror>();
+    _declarations[simpleName] = new JsMethodMirror._(this, _cls);
+  }
+
+  InstanceMirror newInstance(Symbol constructorName, List args,
+      [Map<Symbol, dynamic> namedArgs]) {
+    // FIXME(vsm): Support named constructors and named arguments.

[Jennifer Messerly, 2015/06/15 21:40:16]

here too

[vsm, 2015/06/15 22:46:47]

Done.

+    assert(getName(constructorName) == "");
+    assert(namedArgs == null || namedArgs.isEmpty);
+    var instance = JS('', '#.instantiate(#, #)', _dart, _cls, args);
+    return new JsInstanceMirror._(instance);
+  }
+}
+
+class JsTypeMirror implements TypeMirror {
+  final Type reflectedType;
+
+  JsTypeMirror._(this.reflectedType);
+}
+
+class JsParameterMirror implements ParameterMirror {
+  final String _name;
+  final TypeMirror type;
+  final List<InstanceMirror> metadata = [];
+
+  JsParameterMirror._(this._name, Type t) : type = new JsTypeMirror._(t);
+}
+
+class JsMethodMirror implements MethodMirror {
+  final String _name;
+  final dynamic _method;
+  List<ParameterMirror> _params;
+
+  JsMethodMirror._(JsClassMirror cls, this._method)
+      : _name = getName(cls.simpleName) {
+    var ftype = JS('', '#.classGetConstructorType(#)', _dart, cls._cls);
+    _params = _createParameterMirrorList(ftype);
+  }
+
+  // TODO(vsm): Support named constructors.
+  Symbol get constructorName => new Symbol('');
+  List<ParameterMirror> get parameters => _params;
+
+  List<ParameterMirror> _createParameterMirrorList(ftype) {
+    if (ftype == null) {
+      // TODO(vsm): No explicit constructor.  Verify this.
+      return [];
+    }
+
+    // TODO(vsm): Add named args.
+    List args = ftype.args;
+    List opts = ftype.optionals;
+    var params = new List<ParameterMirror>(args.length + opts.length);
+
+    for (var i = 0; i < args.length; ++i) {
+      var type = args[i];
+      // TODO(vsm): Recover the param name.
+      var param = new JsParameterMirror._('', type);
+      params[i] = param;
+    }
+
+    for (var i = 0; i < opts.length; ++i) {
+      var type = opts[i];
+      // TODO(vsm): Recover the param name.
+      var param = new JsParameterMirror._('', type);
+      params[i + args.length] = param;
+    }
+
+    return params;
+  }
+}