Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler"

pkg/compiler/lib/src/resolution/scope.dart

-// Copyright (c) 2012, 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 resolution;
-
-abstract class Scope {
-  /**
-   * Adds [element] to this scope. This operation is only allowed on mutable
-   * scopes such as [MethodScope] and [BlockScope].
-   */
-  Element add(Element element);
-
-  /**
-   * Looks up the [Element] for [name] in this scope.
-   */
-  Element lookup(String name);
-
-  static Scope buildEnclosingScope(Element element) {
-    return element.enclosingElement != null
-        ? element.enclosingElement.buildScope() : element.buildScope();
-  }
-}
-
-abstract class NestedScope extends Scope {
-  final Scope parent;
-
-  NestedScope(this.parent);
-
-  Element lookup(String name) {
-    Element result = localLookup(name);
-    if (result != null) return result;
-    return parent.lookup(name);
-  }
-
-  Element localLookup(String name);
-}
-
-class VariableDefinitionScope extends NestedScope {
-  final String variableName;
-  bool variableReferencedInInitializer = false;
-
-  VariableDefinitionScope(Scope parent, this.variableName) : super(parent);
-
-  Element localLookup(String name) {
-    if (name == variableName) {
-      variableReferencedInInitializer = true;
-    }
-    return null;
-  }
-
-  Element add(Element newElement) {
-    throw "Cannot add element to VariableDefinitionScope";
-  }
-}
-
-/**
- * [TypeDeclarationScope] defines the outer scope of a type declaration in
- * which the declared type variables and the entities in the enclosing scope are
- * available but where declared and inherited members are not available. This
- * scope is only used for class declarations during resolution of the
- * class hierarchy. In all other cases [ClassScope] is used.
- */
-class TypeDeclarationScope extends NestedScope {
-  final TypeDeclarationElement element;
-
-  TypeDeclarationScope(parent, this.element)
-      : super(parent) {
-    assert(parent != null);
-  }
-
-  Element add(Element newElement) {
-    throw "Cannot add element to TypeDeclarationScope";
-  }
-
-  Element lookupTypeVariable(String name) {
-    List<DartType> typeVariables = element.typeVariables;
-    for (TypeVariableType type in typeVariables) {
-      if (type.name == name) {
-        return type.element;
-      }
-    }
-    return null;
-  }
-
-  Element localLookup(String name) => lookupTypeVariable(name);
-
-  String toString() =>
-      'TypeDeclarationScope($element)';
-}
-
-abstract class MutableScope extends NestedScope {
-  final Map<String, Element> elements;
-
-  MutableScope(Scope parent)
-      : super(parent),
-        this.elements = new Map<String, Element>() {
-    assert(parent != null);
-  }
-
-  Element add(Element newElement) {
-    if (elements.containsKey(newElement.name)) {
-      return elements[newElement.name];
-    }
-    elements[newElement.name] = newElement;
-    return newElement;
-  }
-
-  Element localLookup(String name) => elements[name];
-}
-
-class MethodScope extends MutableScope {
-  final Element element;
-
-  MethodScope(Scope parent, this.element)
-      : super(parent);
-
-  String toString() => 'MethodScope($element${elements.keys.toList()})';
-}
-
-class BlockScope extends MutableScope {
-  BlockScope(Scope parent) : super(parent);
-
-  String toString() => 'BlockScope(${elements.keys.toList()})';
-}
-
-/**
- * [ClassScope] defines the inner scope of a class/interface declaration in
- * which declared members, declared type variables, entities in the enclosing
- * scope and inherited members are available, in the given order.
- */
-class ClassScope extends TypeDeclarationScope {
-  ClassElement get element => super.element;
-
-  ClassScope(Scope parentScope, ClassElement element)
-      : super(parentScope, element)  {
-    assert(parent != null);
-  }
-
-  Element localLookup(String name) {
-    Element result = element.lookupLocalMember(name);
-    if (result != null) return result;
-    return super.localLookup(name);
-  }
-
-  Element lookup(String name) {
-    Element result = localLookup(name);
-    if (result != null) return result;
-    result = parent.lookup(name);
-    if (result != null) return result;
-    return element.lookupSuperMember(name);
-  }
-
-  Element add(Element newElement) {
-    throw "Cannot add an element in a class scope";
-  }
-
-  String toString() => 'ClassScope($element)';
-}
-
-class LibraryScope implements Scope {
-  final LibraryElement library;
-
-  LibraryScope(LibraryElement this.library);
-
-  Element localLookup(String name) => library.find(name);
-  Element lookup(String name) => localLookup(name);
-
-  Element add(Element newElement) {
-    throw "Cannot add an element to a library scope";
-  }
-
-  String toString() => 'LibraryScope($library)';
-}