Remove frog from the repository.

frog/element.dart

-// Copyright (c) 2011, 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.
-
-/**
- * Any abstract representation of a dart element.  This includes
- * [Library], [Type] and [Member].
- */
-class Element implements Hashable {
-  // TODO(jimhug): Make name final when we can do it for Library.
-  /** The user-visible name of this [Element]. */
-  String name;
-
-  /** A safe name to use for this [Element] in generated JS code. */
-  String _jsname;
-
-  /** The lexically/logically enclosing [Element] for lookups. */
-  Element _enclosingElement;
-
-  Element(this.name, this._enclosingElement) {
-    if (name !== null) {
-      String mangled = mangleJsName();
-      assert(!mangled.contains(':'));
-      _jsname = mangled;
-    }
-  }
-
-  // TODO - walk tree
-  Library get library() => null;
-
-  /** A source location for messages to the user about this [Element]. */
-  SourceSpan get span() => null;
-
-  /** Should this element be treated as native JS? */
-  bool get isNative() => false;
-
-  int hashCode() => name.hashCode();
-
-  /** Will return a safe name to refer to this element with in JS code. */
-  String get jsname() => _jsname;
-
-  /** The native name of this element if it has one. */
-  String get nativeName() => _jsname;
-
-  /** Avoid the native name if hidden native. */
-  bool get avoidNativeName() => false;
-
-  /**
-   * [jsname] priority of this element, if two elements conflict.
-   * Higher one gets the name.
-   */
-  int get jsnamePriority() => isNative ? 2 : (library.isCore ? 1 : 0);
-
-  /** Resolve types and other references in the [Element]. */
-  void resolve() {}
-
-  /**
-   * By default we mangle the JS name of an element to avoid
-   * giving them names that clash with JS keywords.
-   */
-  String mangleJsName() => world.toJsIdentifier(name);
-
-  /**
-   * Any type parameters that this element defines to setup a generic
-   * type resolution context.  This is currently used for both generic
-   * types and the semi-magical generic factory methods - but it will
-   * not be used for any other members in the current dart language.
-   */
-  // TODO(jimhug): Confirm whether or not these are still on factories.
-  List<ParameterType> get typeParameters() => null;
-
-  List<Type> get typeArgsInOrder() => const [];
-
-  // TODO(jimhug): Probably kill this.
-  Element get enclosingElement() =>
-    _enclosingElement == null ? library : _enclosingElement;
-
-  // TODO(jimhug): Absolutely kill this one.
-  set enclosingElement(Element e) => _enclosingElement = e;
-
-  Type lookupTypeParam(String name) {
-    if (typeParameters == null) return null;
-
-    for (int i=0; i < typeParameters.length; i++) {
-      if (typeParameters[i].name == name) {
-        return typeArgsInOrder[i];
-      }
-    }
-    return null;
-  }
-
-
-  /**
-   * Resolves [node] in the context of this element.  Will
-   * search up the tree of [enclosingElement] to look for matches.
-   * If [typeErrors] then types that are not found will create errors,
-   * otherwise they will only signal warnings.
-   */
-  Type resolveType(TypeReference node, bool typeErrors, bool allowTypeParams) {
-    if (node == null) return world.varType;
-
-    // TODO(jmesserly): if we failed to resolve a type, we need a way to save
-    // that it was an error, so we don't try to resolve it again and show the
-    // same message twice.
-
-    if (node is SimpleTypeReference) {
-      var ret = node.dynamic.type;
-      if (ret == world.voidType) {
-        world.error('"void" only allowed as return type', node.span);
-        return world.varType;
-      }
-      return ret;
-    } else if (node is NameTypeReference) {
-      NameTypeReference typeRef = node;
-      String name;
-      if (typeRef.names != null) {
-        name = typeRef.names.last().name;
-      } else {
-        name = typeRef.name.name;
-      }
-      var typeParamType = lookupTypeParam(name);
-      if (typeParamType != null) {
-        if (!allowTypeParams) {
-          world.error('using type parameter in illegal context.', node.span);
-        }
-        return typeParamType;
-      }
-
-      return enclosingElement.resolveType(node, typeErrors, allowTypeParams);
-    } else if (node is GenericTypeReference) {
-      GenericTypeReference typeRef = node;
-      // TODO(jimhug): Expand the handling of typeErrors to generics and funcs
-      var baseType = resolveType(typeRef.baseType, typeErrors,
-          allowTypeParams);
-      //!!!print('resolving generic: ${baseType.name}');
-      if (!baseType.isGeneric) {
-        world.error('${baseType.name} is not generic', typeRef.span);
-        return world.varType;
-      }
-      if (typeRef.typeArguments.length != baseType.typeParameters.length) {
-        world.error('wrong number of type arguments', typeRef.span);
-        return world.varType;
-      }
-      var typeArgs = [];
-      for (int i=0; i < typeRef.typeArguments.length; i++) {
-        typeArgs.add(resolveType(typeRef.typeArguments[i], typeErrors,
-            allowTypeParams));
-      }
-      return baseType.getOrMakeConcreteType(typeArgs);
-    } else if (node is FunctionTypeReference) {
-      FunctionTypeReference typeRef = node;
-      var name = '';
-      if (typeRef.func.name != null) {
-        name = typeRef.func.name.name;
-      }
-      return library.getOrAddFunctionType(this, name, typeRef.func, null);
-    }
-    world.internalError('unexpected TypeReference', node.span);
-  }
-}
-
-/**
- * An [Element] representing something in the top level JavaScript environment.
- */
-class ExistingJsGlobal extends Element {
-  /** The element causing this alias. */
-  final Element declaringElement;
-
-  ExistingJsGlobal(name, this.declaringElement) : super(name, null);
-
-  /** Should this element be treated as native JS? */
-  bool get isNative() => true;
-
-  /** This must be the highest possible priority. */
-  int get jsnamePriority() => 10;
-
-  /** A source location for messages to the user about this [Element]. */
-  SourceSpan get span() => declaringElement.span;
-
-  /** A library for messages. */
-  Library get library() => declaringElement.library;
-
-}