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smoke/lib/mirrors.dart

Index: smoke/lib/mirrors.dart
diff --git a/smoke/lib/mirrors.dart b/smoke/lib/mirrors.dart
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--- a/smoke/lib/mirrors.dart
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-// Copyright (c) 2014, 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.
-
-/// Implementation of the smoke services using mirrors.
-library smoke.mirrors;
-
-import 'dart:mirrors';
-import 'package:smoke/smoke.dart';
-import 'package:logging/logging.dart';
-import 'src/common.dart';
-
-/// Set up the smoke package to use a mirror-based implementation. To tune what
-/// is preserved by `dart:mirrors`, use a @MirrorsUsed annotation and include
-/// 'smoke.mirrors' in your override arguments.
-useMirrors() {
-  configure(new ReflectiveObjectAccessorService(),
-      new ReflectiveTypeInspectorService(),
-      new ReflectiveSymbolConverterService());
-}
-
-var _logger = new Logger('smoke.mirrors');
-
-/// Implements [ObjectAccessorService] using mirrors.
-class ReflectiveObjectAccessorService implements ObjectAccessorService {
-  read(Object object, Symbol name) => reflect(object).getField(name).reflectee;
-
-  void write(Object object, Symbol name, value) {
-    reflect(object).setField(name, value);
-  }
-
-  invoke(receiver, Symbol methodName, List args,
-      {Map namedArgs, bool adjust: false}) {
-    var receiverMirror;
-    var method;
-    if (receiver is Type && methodName != #toString) {
-      receiverMirror = reflectType(receiver);
-      method = receiverMirror.declarations[methodName];
-    } else {
-      receiverMirror = reflect(receiver);
-      method = _findMethod(receiverMirror.type, methodName);
-    }
-    if (method != null && adjust) {
-      var required = 0;
-      var optional = 0;
-      for (var p in method.parameters) {
-        if (p.isOptional) {
-          if (!p.isNamed) optional++;
-        } else {
-          required++;
-        }
-      }
-      args = adjustList(args, required, required + optional);
-    }
-    return receiverMirror.invoke(methodName, args, namedArgs).reflectee;
-  }
-}
-
-/// Implements [TypeInspectorService] using mirrors.
-class ReflectiveTypeInspectorService implements TypeInspectorService {
-  bool isSubclassOf(Type type, Type supertype) {
-    if (type == supertype || supertype == Object) return true;
-    // TODO(sigmund): change to mirror.isSubclassOf when it gets implemented in
-    // dart2js. (dartbug.com/12439)
-    var mirror = reflectClass(type);
-    var top = reflectClass(supertype);
-    while (mirror != _objectType) {
-      mirror = _safeSuperclass(mirror);
-      if (mirror == top) return true;
-    }
-    return false;
-  }
-
-  bool hasGetter(Type type, Symbol name) {
-    var mirror = reflectType(type);
-    if (mirror is! ClassMirror) return false;
-    while (mirror != _objectType) {
-      final members = mirror.declarations;
-      if (members.containsKey(name)) return true;
-      mirror = _safeSuperclass(mirror);
-    }
-    return false;
-  }
-
-  bool hasSetter(Type type, Symbol name) {
-    var mirror = reflectType(type);
-    if (mirror is! ClassMirror) return false;
-    var setterName = _setterName(name);
-    while (mirror != _objectType) {
-      final members = mirror.declarations;
-      var declaration = members[name];
-      if (declaration is VariableMirror && !declaration.isFinal) return true;
-      if (members.containsKey(setterName)) return true;
-      mirror = _safeSuperclass(mirror);
-    }
-    return false;
-  }
-
-  bool hasInstanceMethod(Type type, Symbol name) {
-    var mirror = reflectType(type);
-    if (mirror is! ClassMirror) return false;
-    while (mirror != _objectType) {
-      final m = mirror.declarations[name];
-      if (m is MethodMirror && m.isRegularMethod && !m.isStatic) return true;
-      mirror = _safeSuperclass(mirror);
-    }
-    return false;
-  }
-
-  bool hasStaticMethod(Type type, Symbol name) {
-    var mirror = reflectType(type);
-    if (mirror is! ClassMirror) return false;
-    final m = mirror.declarations[name];
-    return m is MethodMirror && m.isRegularMethod && m.isStatic;
-  }
-
-  Declaration getDeclaration(Type type, Symbol name) {
-    var mirror = reflectType(type);
-    if (mirror is! ClassMirror) return null;
-
-    var declaration;
-    while (mirror != _objectType) {
-      final members = mirror.declarations;
-      if (members.containsKey(name)) {
-        declaration = members[name];
-        break;
-      }
-      mirror = _safeSuperclass(mirror);
-    }
-    if (declaration == null) {
-      _logger.severe("declaration doesn't exists ($type.$name).");
-      return null;
-    }
-    return new _MirrorDeclaration(mirror, declaration);
-  }
-
-  List<Declaration> query(Type type, QueryOptions options) {
-    var mirror = reflectType(type);
-    if (mirror is! ClassMirror) return null;
-    return _query(mirror, options);
-  }
-
-  List<Declaration> _query(ClassMirror cls, QueryOptions options) {
-    final visitParent = options.includeInherited && cls.superclass != null &&
-        // TODO(sigmund): use _toType(cls.superclass) != options.includeUpTo
-        // when dartbug.com/16925 gets fixed (_toType fails in dart2js if
-        // applied to classes with type-arguments).
-        cls.superclass != reflectClass(options.includeUpTo);
-    var result = visitParent ? _query(cls.superclass, options) : [];
-    for (var member in cls.declarations.values) {
-      if (member is! VariableMirror && member is! MethodMirror) continue;
-      if (member.isStatic || member.isPrivate) continue;
-      var name = member.simpleName;
-      if (member is VariableMirror) {
-        if (!options.includeFields) continue;
-        if (options.excludeFinal && member.isFinal) continue;
-      }
-
-      // TODO(sigmund): what if we have a setter but no getter?
-      if (member is MethodMirror && member.isSetter) continue;
-      if (member is MethodMirror && member.isConstructor) continue;
-
-      if (member is MethodMirror && member.isGetter) {
-        if (!options.includeProperties) continue;
-        if (options.excludeFinal && !_hasSetter(cls, member)) continue;
-      }
-
-      if (member is MethodMirror && member.isRegularMethod) {
-        if (!options.includeMethods) continue;
-      }
-
-      if (options.matches != null && !options.matches(name)) continue;
-
-      var annotations = member.metadata.map((m) => m.reflectee).toList();
-      if (options.withAnnotations != null &&
-          !matchesAnnotation(annotations, options.withAnnotations)) {
-        continue;
-      }
-
-      var declaration = new _MirrorDeclaration(cls, member);
-
-      if (options.excludeOverriden) {
-        result.retainWhere((value) => declaration.name != value.name);
-      }
-
-      // TODO(sigmund): should we cache parts of this declaration so we don't
-      // compute them twice?  For example, this chould be `new Declaration(name,
-      // type, ...)` and we could reuse what we computed above to implement the
-      // query filtering.  Note, when I tried to eagerly compute everything, I
-      // run into trouble with type (`type = _toType(member.type)`), dart2js
-      // failed when the underlying types had type-arguments (see
-      // dartbug.com/16925).
-      result.add(declaration);
-    }
-
-    return result;
-  }
-}
-
-/// Implements [SymbolConverterService] using mirrors.
-class ReflectiveSymbolConverterService implements SymbolConverterService {
-  String symbolToName(Symbol symbol) => MirrorSystem.getName(symbol);
-  Symbol nameToSymbol(String name) => new Symbol(name);
-}
-
-// TODO(jmesserly): workaround for:
-// https://code.google.com/p/dart/issues/detail?id=10029
-Symbol _setterName(Symbol getter) =>
-    new Symbol('${MirrorSystem.getName(getter)}=');
-
-ClassMirror _safeSuperclass(ClassMirror type) {
-  try {
-    var t = type.superclass;
-    // TODO(sigmund): workaround for darbug.com/17779.
-    // Interceptor is leaked by dart2js. It has the same methods as Object
-    // (including noSuchMethod), and our code above assumes that it doesn't
-    // exist. Most queries exclude Object, so they should exclude Interceptor
-    // too. We don't check for t.simpleName == #Interceptor because depending on
-    // dart2js optimizations it may be #Interceptor or #num/Interceptor.
-    // Checking for a private library seems to reliably filter this out.
-    if (t != null && t.owner != null && t.owner.isPrivate) {
-      t = _objectType;
-    }
-    return t;
-  } on UnsupportedError catch (e) {
-    // Note: dart2js throws UnsupportedError when the type is not reflectable.
-    return _objectType;
-  }
-}
-
-MethodMirror _findMethod(ClassMirror type, Symbol name) {
-  do {
-    var member = type.declarations[name];
-    if (member is MethodMirror) return member;
-    type = type.superclass;
-  } while (type != null);
-  return null;
-}
-
-// When recursively looking for symbols up the type-hierarchy it's generally a
-// good idea to stop at Object, since we know it doesn't have what we want.
-// TODO(jmesserly): This is also a workaround for what appears to be a V8
-// bug introduced between Chrome 31 and 32. After 32
-// JsClassMirror.declarations on Object calls
-// JsClassMirror.typeVariables, which tries to get the _jsConstructor's
-// .prototype["<>"]. This ends up getting the "" property instead, maybe
-// because "<>" doesn't exist, and gets ";" which then blows up because
-// the code later on expects a List of ints.
-final _objectType = reflectClass(Object);
-
-bool _hasSetter(ClassMirror cls, MethodMirror getter) {
-  var mirror = cls.declarations[_setterName(getter.simpleName)];
-  return mirror is MethodMirror && mirror.isSetter;
-}
-
-Type _toType(TypeMirror t) {
-  // TODO(sigmund): this line can go away after dartbug.com/16962
-  if (t == _objectType) return Object;
-  if (t is ClassMirror) return t.reflectedType;
-  if (t == null || t.qualifiedName != #dynamic) {
-    _logger.warning('unknown type ($t).');
-  }
-  return dynamic;
-}
-
-class _MirrorDeclaration implements Declaration {
-  final ClassMirror _cls;
-  final _original;
-
-  _MirrorDeclaration(this._cls, DeclarationMirror this._original);
-
-  Symbol get name => _original.simpleName;
-
-  DeclarationKind get kind => isField ? FIELD : isProperty ? PROPERTY : METHOD;
-
-  bool get isField => _original is VariableMirror;
-
-  bool get isProperty =>
-      _original is MethodMirror && !_original.isRegularMethod;
-
-  bool get isMethod => !isField && !isProperty;
-
-  /// If this is a property, whether it's read only (final fields or properties
-  /// with no setter).
-  bool get isFinal => (_original is VariableMirror && _original.isFinal) ||
-      (_original is MethodMirror &&
-          _original.isGetter &&
-          !_hasSetter(_cls, _original));
-
-  /// If this is a property, it's declared type (including dynamic if it's not
-  /// declared). For methods, the returned type.
-  Type get type {
-    if (_original is MethodMirror && _original.isRegularMethod) {
-      return Function;
-    }
-    var typeMirror =
-        _original is VariableMirror ? _original.type : _original.returnType;
-    return _toType(typeMirror);
-  }
-
-  /// Whether this symbol is static.
-  bool get isStatic => _original.isStatic;
-
-  /// List of annotations in this declaration.
-  List get annotations => _original.metadata.map((a) => a.reflectee).toList();
-
-  int get hashCode => name.hashCode;
-  operator ==(other) => other is Declaration &&
-      name == other.name &&
-      kind == other.kind &&
-      isFinal == other.isFinal &&
-      type == other.type &&
-      isStatic == other.isStatic &&
-      compareLists(annotations, other.annotations);
-  String toString() => (new StringBuffer()
-    ..write('(mirror-based-declaration ')
-    ..write(name)
-    ..write(
-        isField ? ' (field) ' : (isProperty ? ' (property) ' : ' (method) '))
-    ..write(isFinal ? 'final ' : '')
-    ..write(isStatic ? 'static ' : '')
-    ..write(annotations)
-    ..write(')')).toString();
-}