Align source mirrors with runtime mirrors.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_instance_mirrors.dart

Index: sdk/lib/_internal/compiler/implementation/mirrors/dart2js_instance_mirrors.dart
diff --git a/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_instance_mirrors.dart b/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_instance_mirrors.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2fc0e938c0ae5739ccf1c368da3e12b8b38c72a4
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+++ b/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_instance_mirrors.dart
@@ -0,0 +1,278 @@
+// Copyright (c) 2013, 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.
+
+part of dart2js.mirrors;
+
+abstract class ObjectMirrorMixin implements ObjectMirror {
+  InstanceMirror getField(Symbol fieldName) {
+    throw new UnsupportedError('ObjectMirror.getField unsupported.');
+  }
+
+  InstanceMirror setField(Symbol fieldName, Object value) {
+    throw new UnsupportedError('ObjectMirror.setField unsupported.');
+  }
+
+  InstanceMirror invoke(Symbol memberName,
+                        List positionalArguments,
+                        [Map<Symbol, dynamic> namedArguments]) {
+    throw new UnsupportedError('ObjectMirror.invoke unsupported.');
+  }
+}
+
+abstract class InstanceMirrorMixin implements InstanceMirror {
+
+  bool get hasReflectee => false;
+
+  get reflectee {
+    throw new UnsupportedError('InstanceMirror.reflectee unsupported.');
+  }
+
+  Function operator [](Symbol name) {
+    throw new UnsupportedError('InstanceMirror.operator [] unsupported.');
+  }
+
+  delegate(Invocation invocation) {
+    throw new UnsupportedError('InstanceMirror.delegate unsupported');
+  }
+}
+
+InstanceMirror _convertConstantToInstanceMirror(
+    Dart2JsMirrorSystem mirrorSystem, Constant constant) {
+  if (constant is BoolConstant) {
+    return new Dart2JsBoolConstantMirror(mirrorSystem, constant);
+  } else if (constant is NumConstant) {
+    return new Dart2JsNumConstantMirror(mirrorSystem, constant);
+  } else if (constant is StringConstant) {
+    return new Dart2JsStringConstantMirror(mirrorSystem, constant);
+  } else if (constant is ListConstant) {
+    return new Dart2JsListConstantMirror(mirrorSystem, constant);
+  } else if (constant is MapConstant) {
+    return new Dart2JsMapConstantMirror(mirrorSystem, constant);
+  } else if (constant is TypeConstant) {
+    return new Dart2JsTypeConstantMirror(mirrorSystem, constant);
+  } else if (constant is FunctionConstant) {
+    return new Dart2JsConstantMirror(mirrorSystem, constant);
+  } else if (constant is NullConstant) {
+    return new Dart2JsNullConstantMirror(mirrorSystem, constant);
+  } else if (constant is ConstructedConstant) {
+    return new Dart2JsConstructedConstantMirror(mirrorSystem, constant);
+  }
+  mirrorSystem.compiler.internalError("Unexpected constant $constant");
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Mirrors on constant values used for metadata.
+////////////////////////////////////////////////////////////////////////////////
+
+class Dart2JsConstantMirror extends Object
+    with ObjectMirrorMixin, InstanceMirrorMixin
+    implements InstanceMirror {
+  final Dart2JsMirrorSystem mirrorSystem;
+  final Constant _constant;
+
+  Dart2JsConstantMirror(this.mirrorSystem, this._constant);
+
+  // TODO(johnniwinther): Improve the quality of this method.
+  String toString() => '$_constant';
+
+  ClassMirror get type {
+    return mirrorSystem._getTypeDeclarationMirror(
+        _constant.computeType(mirrorSystem.compiler).element);
+  }
+}
+
+class Dart2JsNullConstantMirror extends Dart2JsConstantMirror {
+  Dart2JsNullConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                            NullConstant constant)
+      : super(mirrorSystem, constant);
+
+  NullConstant get _constant => super._constant;
+
+  bool get hasReflectee => true;
+
+  get reflectee => null;
+}
+
+class Dart2JsBoolConstantMirror extends Dart2JsConstantMirror {
+  Dart2JsBoolConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                            BoolConstant constant)
+      : super(mirrorSystem, constant);
+
+  Dart2JsBoolConstantMirror.fromBool(Dart2JsMirrorSystem mirrorSystem,
+                                     bool value)
+      : super(mirrorSystem, value ? new TrueConstant() : new FalseConstant());
+
+  BoolConstant get _constant => super._constant;
+
+  bool get hasReflectee => true;
+
+  get reflectee => _constant is TrueConstant;
+}
+
+class Dart2JsStringConstantMirror extends Dart2JsConstantMirror {
+  Dart2JsStringConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                              StringConstant constant)
+      : super(mirrorSystem, constant);
+
+  Dart2JsStringConstantMirror.fromString(Dart2JsMirrorSystem mirrorSystem,
+                                         String text)
+      : super(mirrorSystem, new StringConstant(new DartString.literal(text)));
+
+  StringConstant get _constant => super._constant;
+
+  bool get hasReflectee => true;
+
+  get reflectee => _constant.value.slowToString();
+}
+
+class Dart2JsNumConstantMirror extends Dart2JsConstantMirror {
+  Dart2JsNumConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                           NumConstant constant)
+      : super(mirrorSystem, constant);
+
+  NumConstant get _constant => super._constant;
+
+  bool get hasReflectee => true;
+
+  get reflectee => _constant.value;
+}
+
+class Dart2JsListConstantMirror extends Dart2JsConstantMirror
+    implements ListInstanceMirror {
+  Dart2JsListConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                            ListConstant constant)
+      : super(mirrorSystem, constant);
+
+  ListConstant get _constant => super._constant;
+
+  int get length => _constant.length;
+
+  InstanceMirror getElement(int index) {
+    if (index < 0) throw new RangeError('Negative index');
+    if (index >= _constant.length) throw new RangeError('Index out of bounds');
+    return _convertConstantToInstanceMirror(mirrorSystem,
+                                            _constant.entries[index]);
+  }
+}
+
+class Dart2JsMapConstantMirror extends Dart2JsConstantMirror
+    implements MapInstanceMirror {
+  List<String> _listCache;
+
+  Dart2JsMapConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                           MapConstant constant)
+      : super(mirrorSystem, constant);
+
+  MapConstant get _constant => super._constant;
+
+  List<String> get _list {
+    if (_listCache == null) {
+      _listCache = new List<String>(_constant.keys.entries.length);
+      int index = 0;
+      for (StringConstant keyConstant in _constant.keys.entries) {
+        _listCache[index] = keyConstant.value.slowToString();
+        index++;
+      }
+      _listCache = new UnmodifiableListView<String>(_listCache);
+    }
+    return _listCache;
+  }
+
+  int get length => _constant.length;
+
+  Iterable<String> get keys {
+    return _list;
+  }
+
+  InstanceMirror getValue(String key) {
+    int index = _list.indexOf(key);
+    if (index == -1) return null;
+    return _convertConstantToInstanceMirror(mirrorSystem,
+                                            _constant.values[index]);
+  }
+}
+
+class Dart2JsTypeConstantMirror extends Dart2JsConstantMirror
+    implements TypeInstanceMirror {
+
+  Dart2JsTypeConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                            TypeConstant constant)
+      : super(mirrorSystem, constant);
+
+  TypeConstant get _constant => super._constant;
+
+  TypeMirror get representedType =>
+      mirrorSystem._convertTypeToTypeMirror(_constant.representedType);
+}
+
+class Dart2JsConstructedConstantMirror extends Dart2JsConstantMirror {
+  Map<String,Constant> _fieldMapCache;
+
+  Dart2JsConstructedConstantMirror(Dart2JsMirrorSystem mirrorSystem,
+                                   ConstructedConstant constant)
+      : super(mirrorSystem, constant);
+
+  ConstructedConstant get _constant => super._constant;
+
+  Map<String,Constant> get _fieldMap {
+    if (_fieldMapCache == null) {
+      _fieldMapCache = new Map<String,Constant>();
+      if (identical(_constant.type.element.kind, ElementKind.CLASS)) {
+        var index = 0;
+        ClassElement element = _constant.type.element;
+        element.forEachInstanceField((_, Element field) {
+          String fieldName = field.name;
+          _fieldMapCache.putIfAbsent(fieldName, () => _constant.fields[index]);
+          index++;
+        }, includeSuperAndInjectedMembers: true);
+      }
+    }
+    return _fieldMapCache;
+  }
+
+  InstanceMirror getField(Symbol fieldName) {
+    Constant fieldConstant = _fieldMap[MirrorSystem.getName(fieldName)];
+    if (fieldConstant != null) {
+      return _convertConstantToInstanceMirror(mirrorSystem, fieldConstant);
+    }
+    return super.getField(fieldName);
+  }
+}
+
+class Dart2JsCommentInstanceMirror extends Object
+  with ObjectMirrorMixin, InstanceMirrorMixin
+  implements CommentInstanceMirror {
+  final Dart2JsMirrorSystem mirrorSystem;
+  final String text;
+  String _trimmedText;
+
+  Dart2JsCommentInstanceMirror(this.mirrorSystem, this.text);
+
+  ClassMirror get type {
+    return mirrorSystem._getTypeDeclarationMirror(
+        mirrorSystem.compiler.documentClass);
+  }
+
+  bool get isDocComment => text.startsWith('/**') || text.startsWith('///');
+
+  String get trimmedText {
+    if (_trimmedText == null) {
+      _trimmedText = stripComment(text);
+    }
+    return _trimmedText;
+  }
+
+  InstanceMirror getField(Symbol fieldName) {
+    if (fieldName == #isDocComment) {
+      return new Dart2JsBoolConstantMirror.fromBool(mirrorSystem, isDocComment);
+    } else if (fieldName == #text) {
+      return new Dart2JsStringConstantMirror.fromString(mirrorSystem, text);
+    } else if (fieldName == #trimmedText) {
+      return new Dart2JsStringConstantMirror.fromString(mirrorSystem,
+                                                        trimmedText);
+    }
+    super.getField(fieldName);
+  }
+}