Roll Observatory packages and add a roll script

quiver/lib/mirrors.dart

-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-library quiver.mirrors;
-
-import 'dart:mirrors';
-
-/**
- * Returns the qualified name of [t].
- */
-Symbol getTypeName(Type t) => reflectClass(t).qualifiedName;
-
-/**
- * Returns true if [o] implements [type].
- */
-bool implements(Object o, Type type) =>
-    classImplements(reflect(o).type, reflectClass(type));
-
-/**
- * Returns true if the class represented by [classMirror] implements the class
- * represented by [interfaceMirror].
- */
-bool classImplements(ClassMirror classMirror, ClassMirror interfaceMirror) {
-  if (classMirror == null) return false;
-  // TODO: change to comparing mirrors when dartbug.com/19781 is fixed
-  if (classMirror.qualifiedName == interfaceMirror.qualifiedName) return true;
-  if (classImplements(classMirror.superclass, interfaceMirror)) return true;
-  if (classMirror.superinterfaces
-      .any((i) => classImplements(i, interfaceMirror))) return true;
-  return false;
-}
-
-/**
- * Walks up the class hierarchy to find a method declaration with the given
- * [name].
- *
- * Note that it's not possible to tell if there's an implementation via
- * noSuchMethod().
- */
-DeclarationMirror getDeclaration(ClassMirror classMirror, Symbol name) {
-  if (classMirror.declarations.containsKey(name)) {
-    return classMirror.declarations[name];
-  }
-  if (classMirror.superclass != null) {
-    var mirror = getDeclaration(classMirror.superclass, name);
-    if (mirror != null) {
-      return mirror;
-    }
-  }
-  for (ClassMirror supe in classMirror.superinterfaces) {
-    var mirror = getDeclaration(supe, name);
-    if (mirror != null) {
-      return mirror;
-    }
-  }
-  return null;
-}
-
-/**
- * Closurzes a method reflectively.
- */
-class Method /* implements Function */ {
-  final InstanceMirror mirror;
-  final Symbol symbol;
-
-  Method(this.mirror, this.symbol);
-
-  dynamic noSuchMethod(Invocation i) {
-    if (i.isMethod && i.memberName == const Symbol('call')) {
-      if (i.namedArguments != null && i.namedArguments.isNotEmpty) {
-        // this will fail until named argument support is implemented
-        return mirror.invoke(
-            symbol, i.positionalArguments, i.namedArguments).reflectee;
-      }
-      return mirror.invoke(symbol, i.positionalArguments).reflectee;
-    }
-    return super.noSuchMethod(i);
-  }
-}