Split parser/listener.dart, parser/class_element_listener.dart and tokens/token.dart into smaller l…

pkg/compiler/lib/src/parser/partial_elements.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, 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.
 
-library dart2js.parser.listener;
+library dart2js.parser.partial_elements;
 
 import '../compiler.dart' show
     Compiler;
 import '../dart_types.dart' show DynamicType;
 import '../diagnostics/diagnostic_listener.dart';
 import '../diagnostics/invariant.dart' show
     invariant;
 import '../diagnostics/messages.dart';
-import '../diagnostics/spannable.dart' show
-    Spannable,
-    SpannableAssertionFailure;
 import '../elements/elements.dart' show
     CompilationUnitElement,
     ConstructorElement,
     Element,
     ElementKind,
     GetterElement,
     LibraryElement,
     MetadataAnnotation,
     MethodElement,
-    SetterElement;
+    SetterElement,
+    STATE_NOT_STARTED,
+    STATE_DONE;
 import '../elements/modelx.dart' show
     BaseFunctionElementX,
+    ClassElementX,
     ConstructorElementX,
-    CompilationUnitElementX,
     DeclarationSite,
     ElementX,
-    EnumClassElementX,
     FieldElementX,
     GetterElementX,
-    LibraryElementX,
     MetadataAnnotationX,
     MethodElementX,
-    MixinApplicationElementX,
     SetterElementX,
     TypedefElementX,
     VariableList;
-import '../native/native.dart' as native;
-import '../string_validator.dart' show
-    StringValidator;
-import '../tokens/keyword.dart' show
-    Keyword;
+import '../elements/visitor.dart' show
+    ElementVisitor;
 import '../tokens/token.dart' show
-    BAD_INPUT_INFO,
     BadInputToken,
     BeginGroupToken,
-    EOF_INFO,
-    EOF_TOKEN,
     ErrorToken,
-    IDENTIFIER_INFO,
-    INDEX_INFO,
     KeywordToken,
     StringToken,
     Token,
     UnmatchedToken,
     UnterminatedToken;
+import '../tokens/token_constants.dart' as Tokens show
+    EOF_TOKEN;
 import '../tree/tree.dart';
-import '../util/util.dart' show
-    Link;
 
 import 'class_element_parser.dart' show
-    PartialClassElement;
+    ClassElementParser;
 import 'parser.dart' show
     Parser;
-
-const bool VERBOSE = false;
-
-/**
- * A parser event listener that does nothing except throw exceptions
- * on parser errors.
- */
-class Listener {
-  set suppressParseErrors(bool value) {
-  }
-
-  void beginArguments(Token token) {
-  }
-
-  void endArguments(int count, Token beginToken, Token endToken) {
-  }
-
-  /// Handle async modifiers `async`, `async*`, `sync`.
-  void handleAsyncModifier(Token asyncToken, Token startToken) {
-  }
-
-  void beginAwaitExpression(Token token) {
-  }
-
-  void endAwaitExpression(Token beginToken, Token endToken) {
-  }
-
-  void beginBlock(Token token) {
-  }
-
-  void endBlock(int count, Token beginToken, Token endToken) {
-  }
-
-  void beginCascade(Token token) {
-  }
-
-  void endCascade() {
-  }
-
-  void beginClassBody(Token token) {
-  }
-
-  void endClassBody(int memberCount, Token beginToken, Token endToken) {
-  }
-
-  void beginClassDeclaration(Token token) {
-  }
-
-  void endClassDeclaration(int interfacesCount, Token beginToken,
-                           Token extendsKeyword, Token implementsKeyword,
-                           Token endToken) {
-  }
-
-  void beginCombinators(Token token) {
-  }
-
-  void endCombinators(int count) {
-  }
-
-  void beginCompilationUnit(Token token) {
-  }
-
-  void endCompilationUnit(int count, Token token) {
-  }
-
-  void beginConstructorReference(Token start) {
-  }
-
-  void endConstructorReference(Token start, Token periodBeforeName,
-                               Token endToken) {
-  }
-
-  void beginDoWhileStatement(Token token) {
-  }
-
-  void endDoWhileStatement(Token doKeyword, Token whileKeyword,
-                           Token endToken) {
-  }
-
-  void beginEnum(Token enumKeyword) {
-  }
-
-  void endEnum(Token enumKeyword, Token endBrace, int count) {
-  }
-
-  void beginExport(Token token) {
-  }
-
-  void endExport(Token exportKeyword, Token semicolon) {
-  }
-
-  void beginExpressionStatement(Token token) {
-  }
-
-  void endExpressionStatement(Token token) {
-  }
-
-  void beginFactoryMethod(Token token) {
-  }
-
-  void endFactoryMethod(Token beginToken, Token endToken) {
-  }
-
-  void beginFormalParameter(Token token) {
-  }
-
-  void endFormalParameter(Token thisKeyword) {
-  }
-
-  void handleNoFormalParameters(Token token) {
-  }
-
-  void beginFormalParameters(Token token) {
-  }
-
-  void endFormalParameters(int count, Token beginToken, Token endToken) {
-  }
-
-  void endFields(int count, Token beginToken, Token endToken) {
-  }
-
-  void beginForStatement(Token token) {
-  }
-
-  void endForStatement(int updateExpressionCount,
-                       Token beginToken, Token endToken) {
-  }
-
-  void endForIn(Token awaitToken, Token forToken,
-                Token inKeyword, Token endToken) {
-  }
-
-  void beginFunction(Token token) {
-  }
-
-  void endFunction(Token getOrSet, Token endToken) {
-  }
-
-  void beginFunctionDeclaration(Token token) {
-  }
-
-  void endFunctionDeclaration(Token token) {
-  }
-
-  void beginFunctionBody(Token token) {
-  }
-
-  void endFunctionBody(int count, Token beginToken, Token endToken) {
-  }
-
-  void handleNoFunctionBody(Token token) {
-  }
-
-  void skippedFunctionBody(Token token) {
-  }
-
-  void beginFunctionName(Token token) {
-  }
-
-  void endFunctionName(Token token) {
-  }
-
-  void beginFunctionTypeAlias(Token token) {
-  }
-
-  void endFunctionTypeAlias(Token typedefKeyword, Token endToken) {
-  }
-
-  void beginMixinApplication(Token token) {
-  }
-
-  void endMixinApplication() {
-  }
-
-  void beginNamedMixinApplication(Token token) {
-  }
-
-  void endNamedMixinApplication(Token classKeyword,
-                                Token implementsKeyword,
-                                Token endToken) {
-  }
-
-  void beginHide(Token hideKeyword) {
-  }
-
-  void endHide(Token hideKeyword) {
-  }
-
-  void beginIdentifierList(Token token) {
-  }
-
-  void endIdentifierList(int count) {
-  }
-
-  void beginTypeList(Token token) {
-  }
-
-  void endTypeList(int count) {
-  }
-
-  void beginIfStatement(Token token) {
-  }
-
-  void endIfStatement(Token ifToken, Token elseToken) {
-  }
-
-  void beginImport(Token importKeyword) {
-  }
-
-  void endImport(Token importKeyword, Token DeferredKeyword,
-                 Token asKeyword, Token semicolon) {
-  }
-
-  void beginInitializedIdentifier(Token token) {
-  }
-
-  void endInitializedIdentifier() {
-  }
-
-  void beginInitializer(Token token) {
-  }
-
-  void endInitializer(Token assignmentOperator) {
-  }
-
-  void beginInitializers(Token token) {
-  }
-
-  void endInitializers(int count, Token beginToken, Token endToken) {
-  }
-
-  void handleNoInitializers() {
-  }
-
-  void handleLabel(Token token) {
-  }
-
-  void beginLabeledStatement(Token token, int labelCount) {
-  }
-
-  void endLabeledStatement(int labelCount) {
-  }
-
-  void beginLibraryName(Token token) {
-  }
-
-  void endLibraryName(Token libraryKeyword, Token semicolon) {
-  }
-
-  void beginLiteralMapEntry(Token token) {
-  }
-
-  void endLiteralMapEntry(Token colon, Token endToken) {
-  }
-
-  void beginLiteralString(Token token) {
-  }
-
-  void endLiteralString(int interpolationCount) {
-  }
-
-  void handleStringJuxtaposition(int literalCount) {
-  }
-
-  void beginMember(Token token) {
-  }
-
-  void endMethod(Token getOrSet, Token beginToken, Token endToken) {
-  }
-
-  void beginMetadataStar(Token token) {
-  }
-
-  void endMetadataStar(int count, bool forParameter) {
-  }
-
-  void beginMetadata(Token token) {
-  }
-
-  void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
-  }
-
-  void beginOptionalFormalParameters(Token token) {
-  }
-
-  void endOptionalFormalParameters(int count,
-                                   Token beginToken, Token endToken) {
-  }
-
-  void beginPart(Token token) {
-  }
-
-  void endPart(Token partKeyword, Token semicolon) {
-  }
-
-  void beginPartOf(Token token) {
-  }
-
-  void endPartOf(Token partKeyword, Token semicolon) {
-  }
-
-  void beginRedirectingFactoryBody(Token token) {
-  }
-
-  void endRedirectingFactoryBody(Token beginToken, Token endToken) {
-  }
-
-  void beginReturnStatement(Token token) {
-  }
-
-  void endReturnStatement(bool hasExpression,
-                          Token beginToken, Token endToken) {
-  }
-
-  void beginSend(Token token) {
-  }
-
-  void endSend(Token token) {
-  }
-
-  void beginShow(Token showKeyword) {
-  }
-
-  void endShow(Token showKeyword) {
-  }
-
-  void beginSwitchStatement(Token token) {
-  }
-
-  void endSwitchStatement(Token switchKeyword, Token endToken) {
-  }
-
-  void beginSwitchBlock(Token token) {
-  }
-
-  void endSwitchBlock(int caseCount, Token beginToken, Token endToken) {
-  }
-
-  void beginLiteralSymbol(Token token) {
-  }
-
-  void endLiteralSymbol(Token hashToken, int identifierCount) {
-  }
-
-  void beginThrowExpression(Token token) {
-  }
-
-  void endThrowExpression(Token throwToken, Token endToken) {
-  }
-
-  void beginRethrowStatement(Token token) {
-  }
-
-  void endRethrowStatement(Token throwToken, Token endToken) {
-  }
-
-  void endTopLevelDeclaration(Token token) {
-  }
-
-  void beginTopLevelMember(Token token) {
-  }
-
-  void endTopLevelFields(int count, Token beginToken, Token endToken) {
-  }
-
-  void endTopLevelMethod(Token beginToken, Token getOrSet, Token endToken) {
-  }
-
-  void beginTryStatement(Token token) {
-  }
-
-  void handleCaseMatch(Token caseKeyword, Token colon) {
-  }
-
-  void handleCatchBlock(Token onKeyword, Token catchKeyword) {
-  }
-
-  void handleFinallyBlock(Token finallyKeyword) {
-  }
-
-  void endTryStatement(int catchCount, Token tryKeyword, Token finallyKeyword) {
-  }
-
-  void endType(Token beginToken, Token endToken) {
-  }
-
-  void beginTypeArguments(Token token) {
-  }
-
-  void endTypeArguments(int count, Token beginToken, Token endToken) {
-  }
-
-  void handleNoTypeArguments(Token token) {
-  }
-
-  void beginTypeVariable(Token token) {
-  }
-
-  void endTypeVariable(Token token) {
-  }
-
-  void beginTypeVariables(Token token) {
-  }
-
-  void endTypeVariables(int count, Token beginToken, Token endToken) {
-  }
-
-  void beginUnnamedFunction(Token token) {
-  }
-
-  void endUnnamedFunction(Token token) {
-  }
-
-  void beginVariablesDeclaration(Token token) {
-  }
-
-  void endVariablesDeclaration(int count, Token endToken) {
-  }
-
-  void beginWhileStatement(Token token) {
-  }
-
-  void endWhileStatement(Token whileKeyword, Token endToken) {
-  }
-
-  void handleAsOperator(Token operathor, Token endToken) {
-    // TODO(ahe): Rename [operathor] to "operator" when VM bug is fixed.
-  }
-
-  void handleAssignmentExpression(Token token) {
-  }
-
-  void handleBinaryExpression(Token token) {
-  }
-
-  void handleConditionalExpression(Token question, Token colon) {
-  }
-
-  void handleConstExpression(Token token) {
-  }
-
-  void handleFunctionTypedFormalParameter(Token token) {
-  }
-
-  void handleIdentifier(Token token) {
-  }
-
-  void handleIndexedExpression(Token openCurlyBracket,
-                               Token closeCurlyBracket) {
-  }
-
-  void handleIsOperator(Token operathor, Token not, Token endToken) {
-    // TODO(ahe): Rename [operathor] to "operator" when VM bug is fixed.
-  }
-
-  void handleLiteralBool(Token token) {
-  }
-
-  void handleBreakStatement(bool hasTarget,
-                            Token breakKeyword, Token endToken) {
-  }
-
-  void handleContinueStatement(bool hasTarget,
-                               Token continueKeyword, Token endToken) {
-  }
-
-  void handleEmptyStatement(Token token) {
-  }
-
-  void handleAssertStatement(Token assertKeyword, Token semicolonToken) {
-  }
-
-  /** Called with either the token containing a double literal, or
-    * an immediately preceding "unary plus" token.
-    */
-  void handleLiteralDouble(Token token) {
-  }
-
-  /** Called with either the token containing an integer literal,
-    * or an immediately preceding "unary plus" token.
-    */
-  void handleLiteralInt(Token token) {
-  }
-
-  void handleLiteralList(int count, Token beginToken, Token constKeyword,
-                         Token endToken) {
-  }
-
-  void handleLiteralMap(int count, Token beginToken, Token constKeyword,
-                        Token endToken) {
-  }
-
-  void handleLiteralNull(Token token) {
-  }
-
-  void handleModifier(Token token) {
-  }
-
-  void handleModifiers(int count) {
-  }
-
-  void handleNamedArgument(Token colon) {
-  }
-
-  void handleNewExpression(Token token) {
-  }
-
-  void handleNoArguments(Token token) {
-  }
-
-  void handleNoExpression(Token token) {
-  }
-
-  void handleNoType(Token token) {
-  }
-
-  void handleNoTypeVariables(Token token) {
-  }
-
-  void handleOperator(Token token) {
-  }
-
-  void handleOperatorName(Token operatorKeyword, Token token) {
-  }
-
-  void handleParenthesizedExpression(BeginGroupToken token) {
-  }
-
-  void handleQualified(Token period) {
-  }
-
-  void handleStringPart(Token token) {
-  }
-
-  void handleSuperExpression(Token token) {
-  }
-
-  void handleSwitchCase(int labelCount, int expressionCount,
-                        Token defaultKeyword, int statementCount,
-                        Token firstToken, Token endToken) {
-  }
-
-  void handleThisExpression(Token token) {
-  }
-
-  void handleUnaryPostfixAssignmentExpression(Token token) {
-  }
-
-  void handleUnaryPrefixExpression(Token token) {
-  }
-
-  void handleUnaryPrefixAssignmentExpression(Token token) {
-  }
-
-  void handleValuedFormalParameter(Token equals, Token token) {
-  }
-
-  void handleVoidKeyword(Token token) {
-  }
-
-  void beginYieldStatement(Token token) {
-  }
-
-  void endYieldStatement(Token yieldToken, Token starToken, Token endToken) {
-  }
-
-  Token expected(String string, Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected '$string', but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token synthesizeIdentifier(Token token) {
-    Token synthesizedToken =
-        new StringToken.fromString(IDENTIFIER_INFO, '?', token.charOffset);
-    synthesizedToken.next = token.next;
-    return synthesizedToken;
-  }
-
-  Token expectedIdentifier(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected identifier, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedType(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected a type, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedExpression(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected an expression, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token unexpected(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("unexpected token '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedBlockToSkip(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected a block, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedFunctionBody(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected a function body, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedClassBody(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected a class body, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedClassBodyToSkip(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected a class body, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedDeclaration(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("expected a declaration, but got '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  Token unmatched(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      error("unmatched '${token.value}'", token);
-    }
-    return skipToEof(token);
-  }
-
-  skipToEof(Token token) {
-    while (!identical(token.info, EOF_INFO)) {
-      token = token.next;
-    }
-    return token;
-  }
-
-  void recoverableError(Token token, String message) {
-    error(message, token);
-  }
-
-  void error(String message, Token token) {
-    throw new ParserError("$message @ ${token.charOffset}");
-  }
-
-  void reportError(Spannable spannable,
-                   MessageKind messageKind,
-                   [Map arguments = const {}]) {
-    MessageTemplate template = MessageTemplate.TEMPLATES[messageKind];
-    String message = template.message(arguments, true).toString();
-    Token token;
-    if (spannable is Token) {
-      token = spannable;
-    } else if (spannable is Node) {
-      token = spannable.getBeginToken();
-    } else {
-      throw new ParserError(message);
-    }
-    recoverableError(token, message);
-  }
-
-  void reportErrorToken(ErrorToken token) {
-    if (token is BadInputToken) {
-      String hex = token.character.toRadixString(16);
-      if (hex.length < 4) {
-        String padding = "0000".substring(hex.length);
-        hex = "$padding$hex";
-      }
-      reportError(
-          token, MessageKind.BAD_INPUT_CHARACTER, {'characterHex': hex});
-    } else if (token is UnterminatedToken) {
-      MessageKind kind;
-      var arguments = const {};
-      switch (token.start) {
-        case '1e':
-          kind = MessageKind.EXPONENT_MISSING;
-          break;
-        case '"':
-        case "'":
-        case '"""':
-        case "'''":
-        case 'r"':
-        case "r'":
-        case 'r"""':
-        case "r'''":
-          kind = MessageKind.UNTERMINATED_STRING;
-          arguments = {'quote': token.start};
-          break;
-        case '0x':
-          kind = MessageKind.HEX_DIGIT_EXPECTED;
-          break;
-        case r'$':
-          kind = MessageKind.MALFORMED_STRING_LITERAL;
-          break;
-        case '/*':
-          kind = MessageKind.UNTERMINATED_COMMENT;
-          break;
-        default:
-          kind = MessageKind.UNTERMINATED_TOKEN;
-          break;
-      }
-      reportError(token, kind, arguments);
-    } else if (token is UnmatchedToken) {
-      String begin = token.begin.value;
-      String end = closeBraceFor(begin);
-      reportError(
-          token, MessageKind.UNMATCHED_TOKEN, {'begin': begin, 'end': end});
-    } else {
-      throw new SpannableAssertionFailure(token, token.assertionMessage);
-    }
-  }
-}
-
-String closeBraceFor(String openBrace) {
-  return const {
-    '(': ')',
-    '[': ']',
-    '{': '}',
-    '<': '>',
-    r'${': '}',
-  }[openBrace];
-}
-
-class ParserError {
-  final String reason;
-  ParserError(this.reason);
-  toString() => reason;
-}
-
-typedef int IdGenerator();
-
-/**
- * A parser event listener designed to work with [PartialParser]. It
- * builds elements representing the top-level declarations found in
- * the parsed compilation unit and records them in
- * [compilationUnitElement].
- */
-class ElementListener extends Listener {
-  final IdGenerator idGenerator;
-  final DiagnosticListener listener;
-  final CompilationUnitElementX compilationUnitElement;
-  final StringValidator stringValidator;
-  Link<StringQuoting> interpolationScope;
-
-  Link<Node> nodes = const Link<Node>();
-
-  Link<MetadataAnnotation> metadata = const Link<MetadataAnnotation>();
-
-  /// Records a stack of booleans for each member parsed (a stack is used to
-  /// support nested members which isn't currently possible, but it also serves
-  /// as a simple way to tell we're currently parsing a member). In this case,
-  /// member refers to members of a library or a class (but currently, classes
-  /// themselves are not considered members).  If the top of the stack
-  /// (memberErrors.head) is true, the current member has already reported at
-  /// least one parse error.
-  Link<bool> memberErrors = const Link<bool>();
-
-  bool suppressParseErrors = false;
-
-  ElementListener(
-      DiagnosticListener listener,
-      this.compilationUnitElement,
-      this.idGenerator)
-      : this.listener = listener,
-        stringValidator = new StringValidator(listener),
-        interpolationScope = const Link<StringQuoting>();
-
-  bool get currentMemberHasParseError {
-    return !memberErrors.isEmpty && memberErrors.head;
-  }
-
-  void pushQuoting(StringQuoting quoting) {
-    interpolationScope = interpolationScope.prepend(quoting);
-  }
-
-  StringQuoting popQuoting() {
-    StringQuoting result = interpolationScope.head;
-    interpolationScope = interpolationScope.tail;
-    return result;
-  }
-
-  StringNode popLiteralString() {
-    StringNode node = popNode();
-    // TODO(lrn): Handle interpolations in script tags.
-    if (node.isInterpolation) {
-      listener.internalError(node,
-          "String interpolation not supported in library tags.");
-      return null;
-    }
-    return node;
-  }
-
-  bool allowLibraryTags() {
-    // Library tags are only allowed in the library file itself, not
-    // in sourced files.
-    LibraryElement library = compilationUnitElement.implementationLibrary;
-    return !compilationUnitElement.hasMembers &&
-           library.entryCompilationUnit == compilationUnitElement;
-  }
-
-  void endLibraryName(Token libraryKeyword, Token semicolon) {
-    Expression name = popNode();
-    addLibraryTag(new LibraryName(libraryKeyword, name,
-                                  popMetadata(compilationUnitElement)));
-  }
-
-  void endImport(Token importKeyword, Token deferredKeyword, Token asKeyword,
-                 Token semicolon) {
-    NodeList combinators = popNode();
-    bool isDeferred = deferredKeyword != null;
-    Identifier prefix;
-    if (asKeyword != null) {
-      prefix = popNode();
-    }
-    StringNode uri = popLiteralString();
-    addLibraryTag(new Import(importKeyword, uri, prefix, combinators,
-                             popMetadata(compilationUnitElement),
-                             isDeferred: isDeferred));
-  }
-
-  void endEnum(Token enumKeyword, Token endBrace, int count) {
-    NodeList names = makeNodeList(count, enumKeyword.next.next, endBrace, ",");
-    Identifier name = popNode();
-
-    int id = idGenerator();
-    Element enclosing = compilationUnitElement;
-    pushElement(new EnumClassElementX(name.source, enclosing, id,
-        new Enum(enumKeyword, name, names)));
-    rejectBuiltInIdentifier(name);
-  }
-
-  void endExport(Token exportKeyword, Token semicolon) {
-    NodeList combinators = popNode();
-    StringNode uri = popNode();
-    addLibraryTag(new Export(exportKeyword, uri, combinators,
-                             popMetadata(compilationUnitElement)));
-  }
-
-  void endCombinators(int count) {
-    if (0 == count) {
-      pushNode(null);
-    } else {
-      pushNode(makeNodeList(count, null, null, " "));
-    }
-  }
-
-  void endHide(Token hideKeyword) => pushCombinator(hideKeyword);
-
-  void endShow(Token showKeyword) => pushCombinator(showKeyword);
-
-  void pushCombinator(Token keywordToken) {
-    NodeList identifiers = popNode();
-    pushNode(new Combinator(identifiers, keywordToken));
-  }
-
-  void endIdentifierList(int count) {
-    pushNode(makeNodeList(count, null, null, ","));
-  }
-
-  void endTypeList(int count) {
-    pushNode(makeNodeList(count, null, null, ","));
-  }
-
-  void endPart(Token partKeyword, Token semicolon) {
-    StringNode uri = popLiteralString();
-    addLibraryTag(new Part(partKeyword, uri,
-                           popMetadata(compilationUnitElement)));
-  }
-
-  void endPartOf(Token partKeyword, Token semicolon) {
-    Expression name = popNode();
-    addPartOfTag(new PartOf(partKeyword, name,
-                            popMetadata(compilationUnitElement)));
-  }
-
-  void addPartOfTag(PartOf tag) {
-    compilationUnitElement.setPartOf(tag, listener);
-  }
-
-  void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
-    if (periodBeforeName != null) {
-      popNode(); // Discard name.
-    }
-    popNode(); // Discard node (Send or Identifier).
-    pushMetadata(new PartialMetadataAnnotation(beginToken, endToken));
-  }
-
-  void endTopLevelDeclaration(Token token) {
-    if (!metadata.isEmpty) {
-      recoverableError(metadata.head.beginToken,
-                       'Metadata not supported here.');
-      metadata = const Link<MetadataAnnotation>();
-    }
-  }
-
-  void endClassDeclaration(int interfacesCount, Token beginToken,
-                           Token extendsKeyword, Token implementsKeyword,
-                           Token endToken) {
-    makeNodeList(interfacesCount, implementsKeyword, null, ","); // interfaces
-    popNode(); // superType
-    popNode(); // typeParameters
-    Identifier name = popNode();
-    int id = idGenerator();
-    PartialClassElement element = new PartialClassElement(
-        name.source, beginToken, endToken, compilationUnitElement, id);
-    pushElement(element);
-    rejectBuiltInIdentifier(name);
-  }
-
-  void rejectBuiltInIdentifier(Identifier name) {
-    if (name.token is KeywordToken) {
-      Keyword keyword = (name.token as KeywordToken).keyword;
-      if (!keyword.isPseudo) {
-        recoverableError(name, "Illegal name '${keyword.syntax}'.");
-      }
-    }
-  }
-
-  void endFunctionTypeAlias(Token typedefKeyword, Token endToken) {
-    popNode(); // TODO(karlklose): do not throw away typeVariables.
-    Identifier name = popNode();
-    popNode(); // returnType
-    pushElement(
-        new PartialTypedefElement(
-            name.source, compilationUnitElement, typedefKeyword, endToken));
-    rejectBuiltInIdentifier(name);
-  }
-
-  void endNamedMixinApplication(Token classKeyword,
-                                Token implementsKeyword,
-                                Token endToken) {
-    NodeList interfaces = (implementsKeyword != null) ? popNode() : null;
-    MixinApplication mixinApplication = popNode();
-    Modifiers modifiers = popNode();
-    NodeList typeParameters = popNode();
-    Identifier name = popNode();
-    NamedMixinApplication namedMixinApplication = new NamedMixinApplication(
-        name, typeParameters, modifiers, mixinApplication, interfaces,
-        classKeyword, endToken);
-
-    int id = idGenerator();
-    Element enclosing = compilationUnitElement;
-    pushElement(new MixinApplicationElementX(name.source, enclosing, id,
-                                             namedMixinApplication,
-                                             modifiers));
-    rejectBuiltInIdentifier(name);
-  }
-
-  void endMixinApplication() {
-    NodeList mixins = popNode();
-    TypeAnnotation superclass = popNode();
-    pushNode(new MixinApplication(superclass, mixins));
-  }
-
-  void handleVoidKeyword(Token token) {
-    pushNode(new TypeAnnotation(new Identifier(token), null));
-  }
-
-  void endTopLevelMethod(Token beginToken, Token getOrSet, Token endToken) {
-    bool hasParseError = currentMemberHasParseError;
-    memberErrors = memberErrors.tail;
-    Identifier name = popNode();
-    popNode(); // type
-    Modifiers modifiers = popNode();
-    PartialFunctionElement element = new PartialFunctionElement(
-        name.source, beginToken, getOrSet, endToken,
-        modifiers, compilationUnitElement);
-    element.hasParseError = hasParseError;
-    pushElement(element);
-  }
-
-  void endTopLevelFields(int count, Token beginToken, Token endToken) {
-    bool hasParseError = currentMemberHasParseError;
-    memberErrors = memberErrors.tail;
-    void buildFieldElement(Identifier name, VariableList fields) {
-      pushElement(
-          new FieldElementX(name, compilationUnitElement, fields));
-    }
-    NodeList variables = makeNodeList(count, null, null, ",");
-    popNode(); // type
-    Modifiers modifiers = popNode();
-    buildFieldElements(modifiers, variables, compilationUnitElement,
-                       buildFieldElement,
-                       beginToken, endToken, hasParseError);
-  }
-
-  void buildFieldElements(Modifiers modifiers,
-                          NodeList variables,
-                          Element enclosingElement,
-                          void buildFieldElement(Identifier name,
-                                                 VariableList fields),
-                          Token beginToken, Token endToken,
-                          bool hasParseError) {
-    VariableList fields =
-        new PartialFieldList(beginToken, endToken, modifiers, hasParseError);
-    for (Link<Node> variableNodes = variables.nodes;
-         !variableNodes.isEmpty;
-         variableNodes = variableNodes.tail) {
-      Expression initializedIdentifier = variableNodes.head;
-      Identifier identifier = initializedIdentifier.asIdentifier();
-      if (identifier == null) {
-        identifier = initializedIdentifier.asSendSet().selector.asIdentifier();
-      }
-      buildFieldElement(identifier, fields);
-    }
-  }
-
-  void handleIdentifier(Token token) {
-    pushNode(new Identifier(token));
-  }
-
-  void handleQualified(Token period) {
-    Identifier last = popNode();
-    Expression first = popNode();
-    pushNode(new Send(first, last));
-  }
-
-  void handleNoType(Token token) {
-    pushNode(null);
-  }
-
-  void endTypeVariable(Token token) {
-    TypeAnnotation bound = popNode();
-    Identifier name = popNode();
-    pushNode(new TypeVariable(name, bound));
-    rejectBuiltInIdentifier(name);
-  }
-
-  void endTypeVariables(int count, Token beginToken, Token endToken) {
-    pushNode(makeNodeList(count, beginToken, endToken, ','));
-  }
-
-  void handleNoTypeVariables(token) {
-    pushNode(null);
-  }
-
-  void endTypeArguments(int count, Token beginToken, Token endToken) {
-    pushNode(makeNodeList(count, beginToken, endToken, ','));
-  }
-
-  void handleNoTypeArguments(Token token) {
-    pushNode(null);
-  }
-
-  void endType(Token beginToken, Token endToken) {
-    NodeList typeArguments = popNode();
-    Expression typeName = popNode();
-    pushNode(new TypeAnnotation(typeName, typeArguments));
-  }
-
-  void handleParenthesizedExpression(BeginGroupToken token) {
-    Expression expression = popNode();
-    pushNode(new ParenthesizedExpression(expression, token));
-  }
-
-  void handleModifier(Token token) {
-    pushNode(new Identifier(token));
-  }
-
-  void handleModifiers(int count) {
-    if (count == 0) {
-      pushNode(Modifiers.EMPTY);
-    } else {
-      NodeList modifierNodes = makeNodeList(count, null, null, ' ');
-      pushNode(new Modifiers(modifierNodes));
-    }
-  }
-
-  Token expected(String string, Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else if (identical(';', string)) {
-      // When a semicolon is missing, it often leads to an error on the
-      // following line. So we try to find the token preceding the semicolon
-      // and report that something is missing *after* it.
-      Token preceding = findPrecedingToken(token);
-      if (preceding == token) {
-        reportError(
-            token, MessageKind.MISSING_TOKEN_BEFORE_THIS, {'token': string});
-      } else {
-        reportError(
-            preceding, MessageKind.MISSING_TOKEN_AFTER_THIS, {'token': string});
-      }
-      return token;
-    } else {
-      reportFatalError(
-          token,
-          MessageTemplate.TEMPLATES[MessageKind.MISSING_TOKEN_BEFORE_THIS]
-              .message({'token': string}, true).toString());
-    }
-    return skipToEof(token);
-  }
-
-  /// Finds the preceding token via the begin token of the last AST node pushed
-  /// on the [nodes] stack.
-  Token findPrecedingToken(Token token) {
-    Token result;
-    Link<Node> nodes = this.nodes;
-    while (!nodes.isEmpty) {
-      result = findPrecedingTokenFromNode(nodes.head, token);
-      if (result != null) {
-        return result;
-      }
-      nodes = nodes.tail;
-    }
-    if (compilationUnitElement != null) {
-      if (compilationUnitElement is CompilationUnitElementX) {
-        CompilationUnitElementX unit = compilationUnitElement;
-        Link<Element> members = unit.localMembers;
-        while (!members.isEmpty) {
-          ElementX member = members.head;
-          DeclarationSite site = member.declarationSite;
-          if (site is PartialElement) {
-            result = findPrecedingTokenFromToken(site.endToken, token);
-            if (result != null) {
-              return result;
-            }
-          }
-          members = members.tail;
-        }
-        result =
-            findPrecedingTokenFromNode(compilationUnitElement.partTag, token);
-        if (result != null) {
-          return result;
-        }
-      }
-    }
-    return token;
-  }
-
-  Token findPrecedingTokenFromNode(Node node, Token token) {
-    if (node != null) {
-      return findPrecedingTokenFromToken(node.getBeginToken(), token);
-    }
-    return null;
-  }
-
-  Token findPrecedingTokenFromToken(Token start, Token token) {
-    if (start != null) {
-      Token current = start;
-      while (current.kind != EOF_TOKEN && current.next != token) {
-        current = current.next;
-      }
-      if (current.kind != EOF_TOKEN) {
-        return current;
-      }
-    }
-    return null;
-  }
-
-  Token expectedIdentifier(Token token) {
-    if (token is KeywordToken) {
-      reportError(
-          token, MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD,
-          {'keyword': token.value});
-    } else if (token is ErrorToken) {
-      reportErrorToken(token);
-      return synthesizeIdentifier(token);
-    } else {
-      reportFatalError(token,
-          "Expected identifier, but got '${token.value}'.");
-    }
-    return token;
-  }
-
-  Token expectedType(Token token) {
-    pushNode(null);
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-      return synthesizeIdentifier(token);
-    } else {
-      reportFatalError(
-          token, "Expected a type, but got '${token.value}'.");
-      return skipToEof(token);
-    }
-  }
-
-  Token expectedExpression(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-      pushNode(new ErrorExpression(token));
-      return token.next;
-    } else {
-      reportFatalError(token,
-                       "Expected an expression, but got '${token.value}'.");
-      pushNode(null);
-      return skipToEof(token);
-    }
-  }
-
-  Token unexpected(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      String message = "Unexpected token '${token.value}'.";
-      if (token.info == BAD_INPUT_INFO) {
-        message = token.value;
-      }
-      reportFatalError(token, message);
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedBlockToSkip(Token token) {
-    if (identical(token.stringValue, 'native')) {
-      return native.handleNativeBlockToSkip(this, token);
-    } else {
-      return unexpected(token);
-    }
-  }
-
-  Token expectedFunctionBody(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      String printString = token.value;
-      reportFatalError(token,
-                       "Expected a function body, but got '$printString'.");
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedClassBody(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      reportFatalError(token,
-                       "Expected a class body, but got '${token.value}'.");
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedClassBodyToSkip(Token token) {
-    return unexpected(token);
-  }
-
-  Token expectedDeclaration(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      reportFatalError(token,
-                       "Expected a declaration, but got '${token.value}'.");
-    }
-    return skipToEof(token);
-  }
-
-  Token unmatched(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-    } else {
-      String begin = token.value;
-      String end = closeBraceFor(begin);
-      reportError(
-          token, MessageKind.UNMATCHED_TOKEN, {'begin': begin, 'end': end});
-    }
-    Token next = token.next;
-    while (next is ErrorToken) {
-      next = next.next;
-    }
-    return next;
-  }
-
-  void recoverableError(Spannable node, String message) {
-    // TODO(johnniwinther): Make recoverable errors non-fatal.
-    reportFatalError(node, message);
-  }
-
-  void pushElement(Element element) {
-    popMetadata(element);
-    compilationUnitElement.addMember(element, listener);
-  }
-
-  Link<MetadataAnnotation> popMetadata(ElementX element) {
-    var result = const Link<MetadataAnnotation>();
-    for (Link link = metadata; !link.isEmpty; link = link.tail) {
-      element.addMetadata(link.head);
-      // Reverse the list as is implicitly done by addMetadata.
-      result = result.prepend(link.head);
-    }
-    metadata = const Link<MetadataAnnotation>();
-    return result;
-  }
-
-  void pushMetadata(MetadataAnnotation annotation) {
-    metadata = metadata.prepend(annotation);
-  }
-
-  void addLibraryTag(LibraryTag tag) {
-    if (!allowLibraryTags()) {
-      recoverableError(tag, 'Library tags not allowed here.');
-    }
-    LibraryElementX implementationLibrary =
-        compilationUnitElement.implementationLibrary;
-    implementationLibrary.addTag(tag, listener);
-  }
-
-  void pushNode(Node node) {
-    nodes = nodes.prepend(node);
-    if (VERBOSE) log("push $nodes");
-  }
-
-  Node popNode() {
-    assert(!nodes.isEmpty);
-    Node node = nodes.head;
-    nodes = nodes.tail;
-    if (VERBOSE) log("pop $nodes");
-    return node;
-  }
-
-  void log(message) {
-    print(message);
-  }
-
-  NodeList makeNodeList(int count, Token beginToken, Token endToken,
-                        String delimiter) {
-    Link<Node> poppedNodes = const Link<Node>();
-    for (; count > 0; --count) {
-      // This effectively reverses the order of nodes so they end up
-      // in correct (source) order.
-      poppedNodes = poppedNodes.prepend(popNode());
-    }
-    return new NodeList(beginToken, poppedNodes, endToken, delimiter);
-  }
-
-  void beginLiteralString(Token token) {
-    String source = token.value;
-    StringQuoting quoting = StringValidator.quotingFromString(source);
-    pushQuoting(quoting);
-    // Just wrap the token for now. At the end of the interpolation,
-    // when we know how many there are, go back and validate the tokens.
-    pushNode(new LiteralString(token, null));
-  }
-
-  void handleStringPart(Token token) {
-    // Just push an unvalidated token now, and replace it when we know the
-    // end of the interpolation.
-    pushNode(new LiteralString(token, null));
-  }
-
-  void endLiteralString(int count) {
-    StringQuoting quoting = popQuoting();
-
-    Link<StringInterpolationPart> parts =
-        const Link<StringInterpolationPart>();
-    // Parts of the string interpolation are popped in reverse order,
-    // starting with the last literal string part.
-    bool isLast = true;
-    for (int i = 0; i < count; i++) {
-      LiteralString string = popNode();
-      DartString validation =
-          stringValidator.validateInterpolationPart(string.token, quoting,
-                                                    isFirst: false,
-                                                    isLast: isLast);
-      // Replace the unvalidated LiteralString with a new LiteralString
-      // object that has the validation result included.
-      string = new LiteralString(string.token, validation);
-      Expression expression = popNode();
-      parts = parts.prepend(new StringInterpolationPart(expression, string));
-      isLast = false;
-    }
-
-    LiteralString string = popNode();
-    DartString validation =
-        stringValidator.validateInterpolationPart(string.token, quoting,
-                                                  isFirst: true,
-                                                  isLast: isLast);
-    string = new LiteralString(string.token, validation);
-    if (isLast) {
-      pushNode(string);
-    } else {
-      NodeList partNodes = new NodeList(null, parts, null, "");
-      pushNode(new StringInterpolation(string, partNodes));
-    }
-  }
-
-  void handleStringJuxtaposition(int stringCount) {
-    assert(stringCount != 0);
-    Expression accumulator = popNode();
-    stringCount--;
-    while (stringCount > 0) {
-      Expression expression = popNode();
-      accumulator = new StringJuxtaposition(expression, accumulator);
-      stringCount--;
-    }
-    pushNode(accumulator);
-  }
-
-  void beginMember(Token token) {
-    memberErrors = memberErrors.prepend(false);
-  }
-
-  void beginTopLevelMember(Token token) {
-    beginMember(token);
-  }
-
-  void endFields(fieldCount, start, token) {
-    memberErrors = memberErrors.tail;
-  }
-
-  void endMethod(getOrSet, start, token) {
-    memberErrors = memberErrors.tail;
-  }
-
-  void beginFactoryMethod(Token token) {
-    memberErrors = memberErrors.prepend(false);
-  }
-
-  void endFactoryMethod(Token beginToken, Token endToken) {
-    memberErrors = memberErrors.tail;
-  }
-
-  /// Don't call this method. Should only be used as a last resort when there
-  /// is no feasible way to recover from a parser error.
-  void reportFatalError(Spannable spannable, String message) {
-    reportError(spannable, MessageKind.GENERIC, {'text': message});
-    // Some parse errors are infeasible to recover from, so we throw an error.
-    throw new ParserError(message);
-  }
-
-  void reportError(Spannable spannable,
-                   MessageKind errorCode,
-                   [Map arguments = const {}]) {
-    if (currentMemberHasParseError) return; // Error already reported.
-    if (suppressParseErrors) return;
-    if (!memberErrors.isEmpty) {
-      memberErrors = memberErrors.tail.prepend(true);
-    }
-    listener.reportError(spannable, errorCode, arguments);
-  }
-}
-
-class NodeListener extends ElementListener {
-  NodeListener(
-      DiagnosticListener listener,
-      CompilationUnitElement element)
-    : super(listener, element, null);
-
-  void addLibraryTag(LibraryTag tag) {
-    pushNode(tag);
-  }
-
-  void addPartOfTag(PartOf tag) {
-    pushNode(tag);
-  }
-
-  void endClassDeclaration(int interfacesCount, Token beginToken,
-                           Token extendsKeyword, Token implementsKeyword,
-                           Token endToken) {
-    NodeList body = popNode();
-    NodeList interfaces =
-        makeNodeList(interfacesCount, implementsKeyword, null, ",");
-    Node supertype = popNode();
-    NodeList typeParameters = popNode();
-    Identifier name = popNode();
-    Modifiers modifiers = popNode();
-    pushNode(new ClassNode(modifiers, name, typeParameters, supertype,
-                           interfaces, beginToken, extendsKeyword, body,
-                           endToken));
-  }
-
-  void endCompilationUnit(int count, Token token) {
-    pushNode(makeNodeList(count, null, null, '\n'));
-  }
-
-  void endFunctionTypeAlias(Token typedefKeyword, Token endToken) {
-    NodeList formals = popNode();
-    NodeList typeParameters = popNode();
-    Identifier name = popNode();
-    TypeAnnotation returnType = popNode();
-    pushNode(new Typedef(returnType, name, typeParameters, formals,
-                         typedefKeyword, endToken));
-  }
-
-  void endNamedMixinApplication(Token classKeyword,
-                                Token implementsKeyword,
-                                Token endToken) {
-    NodeList interfaces = (implementsKeyword != null) ? popNode() : null;
-    Node mixinApplication = popNode();
-    Modifiers modifiers = popNode();
-    NodeList typeParameters = popNode();
-    Identifier name = popNode();
-    pushNode(new NamedMixinApplication(name, typeParameters,
-                                       modifiers, mixinApplication,
-                                       interfaces,
-                                       classKeyword, endToken));
-  }
-
-  void endEnum(Token enumKeyword, Token endBrace, int count) {
-    NodeList names = makeNodeList(count, enumKeyword.next.next, endBrace, ",");
-    Identifier name = popNode();
-    pushNode(new Enum(enumKeyword, name, names));
-  }
-
-  void endClassBody(int memberCount, Token beginToken, Token endToken) {
-    pushNode(makeNodeList(memberCount, beginToken, endToken, null));
-  }
-
-  void endTopLevelFields(int count, Token beginToken, Token endToken) {
-    NodeList variables = makeNodeList(count, null, endToken, ",");
-    TypeAnnotation type = popNode();
-    Modifiers modifiers = popNode();
-    pushNode(new VariableDefinitions(type, modifiers, variables));
-  }
-
-  void endTopLevelMethod(Token beginToken, Token getOrSet, Token endToken) {
-    popNode(); // body
-    popNode(); // formalParameters
-    Identifier name = popNode();
-    popNode(); // type
-    Modifiers modifiers = popNode();
-    PartialFunctionElement element = new PartialFunctionElement(
-        name.source, beginToken, getOrSet, endToken,
-        modifiers, compilationUnitElement);
-    pushElement(element);
-  }
-
-  void endFormalParameter(Token thisKeyword) {
-    Expression name = popNode();
-    if (thisKeyword != null) {
-      Identifier thisIdentifier = new Identifier(thisKeyword);
-      if (name.asSend() == null) {
-        name = new Send(thisIdentifier, name);
-      } else {
-        name = name.asSend().copyWithReceiver(thisIdentifier, false);
-      }
-    }
-    TypeAnnotation type = popNode();
-    Modifiers modifiers = popNode();
-    NodeList metadata = popNode();
-    pushNode(new VariableDefinitions.forParameter(
-        metadata, type, modifiers, new NodeList.singleton(name)));
-  }
-
-  void endFormalParameters(int count, Token beginToken, Token endToken) {
-    pushNode(makeNodeList(count, beginToken, endToken, ","));
-  }
-
-  void handleNoFormalParameters(Token token) {
-    pushNode(null);
-  }
-
-  void endArguments(int count, Token beginToken, Token endToken) {
-    pushNode(makeNodeList(count, beginToken, endToken, ","));
-  }
-
-  void handleNoArguments(Token token) {
-    pushNode(null);
-  }
-
-  void endConstructorReference(Token start, Token periodBeforeName,
-                               Token endToken) {
-    Identifier name = null;
-    if (periodBeforeName != null) {
-      name = popNode();
-    }
-    NodeList typeArguments = popNode();
-    Node classReference = popNode();
-    if (typeArguments != null) {
-      classReference = new TypeAnnotation(classReference, typeArguments);
-    } else {
-      Identifier identifier = classReference.asIdentifier();
-      Send send = classReference.asSend();
-      if (identifier != null) {
-        // TODO(ahe): Should be:
-        // classReference = new Send(null, identifier);
-        classReference = identifier;
-      } else if (send != null) {
-        classReference = send;
-      } else {
-        internalError(node: classReference);
-      }
-    }
-    Node constructor = classReference;
-    if (name != null) {
-      // Either typeName<args>.name or x.y.name.
-      constructor = new Send(classReference, name);
-    }
-    pushNode(constructor);
-  }
-
-  void endRedirectingFactoryBody(Token beginToken,
-                                 Token endToken) {
-    pushNode(new RedirectingFactoryBody(beginToken, endToken, popNode()));
-  }
-
-  void endReturnStatement(bool hasExpression,
-                          Token beginToken, Token endToken) {
-    Expression expression = hasExpression ? popNode() : null;
-    pushNode(new Return(beginToken, endToken, expression));
-  }
-
-  void endYieldStatement(Token yieldToken, Token starToken, Token endToken) {
-    Expression expression = popNode();
-    pushNode(new Yield(yieldToken, starToken, expression, endToken));
-  }
-
-  void endExpressionStatement(Token token) {
-    pushNode(new ExpressionStatement(popNode(), token));
-  }
-
-  void handleOnError(Token token, var errorInformation) {
-    listener.internalError(token, "'${token.value}': ${errorInformation}");
-  }
-
-  Token expectedFunctionBody(Token token) {
-    if (identical(token.stringValue, 'native')) {
-      return native.handleNativeFunctionBody(this, token);
-    } else if (token is ErrorToken) {
-      pushNode(null);
-      reportErrorToken(token);
-    } else {
-      reportFatalError(token,
-                       "Expected a function body, but got '${token.value}'.");
-    }
-    return skipToEof(token);
-  }
-
-  Token expectedClassBody(Token token) {
-    if (token is ErrorToken) {
-      reportErrorToken(token);
-      return skipToEof(token);
-    } else {
-      reportFatalError(token,
-                       "Expected a class body, but got '${token.value}'.");
-      return skipToEof(token);
-    }
-  }
-
-  void handleLiteralInt(Token token) {
-    pushNode(new LiteralInt(token, (t, e) => handleOnError(t, e)));
-  }
-
-  void handleLiteralDouble(Token token) {
-    pushNode(new LiteralDouble(token, (t, e) => handleOnError(t, e)));
-  }
-
-  void handleLiteralBool(Token token) {
-    pushNode(new LiteralBool(token, (t, e) => handleOnError(t, e)));
-  }
-
-  void handleLiteralNull(Token token) {
-    pushNode(new LiteralNull(token));
-  }
-
-  void endLiteralSymbol(Token hashToken, int identifierCount) {
-    NodeList identifiers = makeNodeList(identifierCount, null, null, '.');
-    pushNode(new LiteralSymbol(hashToken, identifiers));
-  }
-
-  void handleBinaryExpression(Token token) {
-    Node argument = popNode();
-    Node receiver = popNode();
-    String tokenString = token.stringValue;
-    if (identical(tokenString, '.') ||
-        identical(tokenString, '..') ||
-        identical(tokenString, '?.')) {
-      Send argumentSend = argument.asSend();
-      if (argumentSend == null) {
-        // TODO(ahe): The parser should diagnose this problem, not
-        // this listener.
-        reportFatalError(argument,
-                         'Expected an identifier.');
-      }
-      if (argumentSend.receiver != null) internalError(node: argument);
-      if (argument is SendSet) internalError(node: argument);
-      pushNode(argument.asSend().copyWithReceiver(receiver,
-            identical(tokenString, '?.')));
-    } else {
-      NodeList arguments = new NodeList.singleton(argument);
-      pushNode(new Send(receiver, new Operator(token), arguments));
-    }
-    if (identical(tokenString, '===')) {
-      listener.reportError(token, MessageKind.UNSUPPORTED_EQ_EQ_EQ,
-                           {'lhs': receiver, 'rhs': argument});
-    }
-    if (identical(tokenString, '!==')) {
-      listener.reportError(token, MessageKind.UNSUPPORTED_BANG_EQ_EQ,
-                           {'lhs': receiver, 'rhs': argument});
-    }
-  }
-
-  void beginCascade(Token token) {
-    pushNode(new CascadeReceiver(popNode(), token));
-  }
-
-  void endCascade() {
-    pushNode(new Cascade(popNode()));
-  }
-
-  void handleAsOperator(Token operathor, Token endToken) {
-    TypeAnnotation type = popNode();
-    Expression expression = popNode();
-    NodeList arguments = new NodeList.singleton(type);
-    pushNode(new Send(expression, new Operator(operathor), arguments));
-  }
-
-  void handleAssignmentExpression(Token token) {
-    Node arg = popNode();
-    Node node = popNode();
-    Send send = node.asSend();
-    if (send == null || !(send.isPropertyAccess || send.isIndex)) {
-      reportNotAssignable(node);
-    }
-    if (send.asSendSet() != null) internalError(node: send);
-    NodeList arguments;
-    if (send.isIndex) {
-      Link<Node> link = const Link<Node>().prepend(arg);
-      link = link.prepend(send.arguments.head);
-      arguments = new NodeList(null, link);
-    } else {
-      arguments = new NodeList.singleton(arg);
-    }
-    Operator op = new Operator(token);
-    pushNode(new SendSet(send.receiver, send.selector, op, arguments,
-        send.isConditional));
-  }
-
-  void reportNotAssignable(Node node) {
-    // TODO(ahe): The parser should diagnose this problem, not this
-    // listener.
-    reportFatalError(node,
-                     'Not assignable.');
-  }
-
-  void handleConditionalExpression(Token question, Token colon) {
-    Node elseExpression = popNode();
-    Node thenExpression = popNode();
-    Node condition = popNode();
-    pushNode(new Conditional(
-        condition, thenExpression, elseExpression, question, colon));
-  }
-
-  void endSend(Token token) {
-    NodeList arguments = popNode();
-    Node selector = popNode();
-    // TODO(ahe): Handle receiver.
-    pushNode(new Send(null, selector, arguments));
-  }
-
-  void endFunctionBody(int count, Token beginToken, Token endToken) {
-    if (count == 0 && beginToken == null) {
-      pushNode(new EmptyStatement(endToken));
-    } else {
-      pushNode(new Block(makeNodeList(count, beginToken, endToken, null)));
-    }
-  }
-
-  void handleAsyncModifier(Token asyncToken, Token starToken) {
-    if (asyncToken != null) {
-      pushNode(new AsyncModifier(asyncToken, starToken));
-    } else {
-      pushNode(null);
-    }
-  }
-
-  void skippedFunctionBody(Token token) {
-    pushNode(new Block(new NodeList.empty()));
-  }
-
-  void handleNoFunctionBody(Token token) {
-    pushNode(new EmptyStatement(token));
-  }
-
-  void endFunction(Token getOrSet, Token endToken) {
-    Statement body = popNode();
-    AsyncModifier asyncModifier = popNode();
-    NodeList initializers = popNode();
-    NodeList formals = popNode();
-    // The name can be an identifier or a send in case of named constructors.
-    Expression name = popNode();
-    TypeAnnotation type = popNode();
-    Modifiers modifiers = popNode();
-    pushNode(new FunctionExpression(name, formals, body, type,
-                                    modifiers, initializers, getOrSet,
-                                    asyncModifier));
-  }
-
-  void endFunctionDeclaration(Token endToken) {
-    pushNode(new FunctionDeclaration(popNode()));
-  }
-
-  void endVariablesDeclaration(int count, Token endToken) {
-    // TODO(ahe): Pick one name for this concept, either
-    // VariablesDeclaration or VariableDefinitions.
-    NodeList variables = makeNodeList(count, null, endToken, ",");
-    TypeAnnotation type = popNode();
-    Modifiers modifiers = popNode();
-    pushNode(new VariableDefinitions(type, modifiers, variables));
-  }
-
-  void endInitializer(Token assignmentOperator) {
-    Expression initializer = popNode();
-    NodeList arguments =
-        initializer == null ? null : new NodeList.singleton(initializer);
-    Expression name = popNode();
-    Operator op = new Operator(assignmentOperator);
-    pushNode(new SendSet(null, name, op, arguments));
-  }
-
-  void endIfStatement(Token ifToken, Token elseToken) {
-    Statement elsePart = (elseToken == null) ? null : popNode();
-    Statement thenPart = popNode();
-    ParenthesizedExpression condition = popNode();
-    pushNode(new If(condition, thenPart, elsePart, ifToken, elseToken));
-  }
-
-  void endForStatement(int updateExpressionCount,
-                       Token beginToken, Token endToken) {
-    Statement body = popNode();
-    NodeList updates = makeNodeList(updateExpressionCount, null, null, ',');
-    Statement condition = popNode();
-    Node initializer = popNode();
-    pushNode(new For(initializer, condition, updates, body, beginToken));
-  }
-
-  void handleNoExpression(Token token) {
-    pushNode(null);
-  }
-
-  void endDoWhileStatement(Token doKeyword, Token whileKeyword,
-                           Token endToken) {
-    Expression condition = popNode();
-    Statement body = popNode();
-    pushNode(new DoWhile(body, condition, doKeyword, whileKeyword, endToken));
-  }
-
-  void endWhileStatement(Token whileKeyword, Token endToken) {
-    Statement body = popNode();
-    Expression condition = popNode();
-    pushNode(new While(condition, body, whileKeyword));
-  }
-
-  void endBlock(int count, Token beginToken, Token endToken) {
-    pushNode(new Block(makeNodeList(count, beginToken, endToken, null)));
-  }
-
-  void endThrowExpression(Token throwToken, Token endToken) {
-    Expression expression = popNode();
-    pushNode(new Throw(expression, throwToken, endToken));
-  }
-
-  void endAwaitExpression(Token awaitToken, Token endToken) {
-    Expression expression = popNode();
-    pushNode(new Await(awaitToken, expression));
-  }
-
-  void endRethrowStatement(Token throwToken, Token endToken) {
-    pushNode(new Rethrow(throwToken, endToken));
-    if (identical(throwToken.stringValue, 'throw')) {
-      listener.reportError(throwToken,
-                           MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP);
-    }
-  }
-
-  void handleUnaryPrefixExpression(Token token) {
-    pushNode(new Send.prefix(popNode(), new Operator(token)));
-  }
-
-  void handleSuperExpression(Token token) {
-    pushNode(new Identifier(token));
-  }
-
-  void handleThisExpression(Token token) {
-    pushNode(new Identifier(token));
-  }
-
-  void handleUnaryAssignmentExpression(Token token, bool isPrefix) {
-    Node node = popNode();
-    Send send = node.asSend();
-    if (send == null) {
-      reportNotAssignable(node);
-    }
-    if (!(send.isPropertyAccess || send.isIndex)) {
-      reportNotAssignable(node);
-    }
-    if (send.asSendSet() != null) internalError(node: send);
-    Node argument = null;
-    if (send.isIndex) argument = send.arguments.head;
-    Operator op = new Operator(token);
-
-    if (isPrefix) {
-      pushNode(new SendSet.prefix(send.receiver, send.selector, op, argument,
-          send.isConditional));
-    } else {
-      pushNode(new SendSet.postfix(send.receiver, send.selector, op, argument,
-          send.isConditional));
-    }
-  }
-
-  void handleUnaryPostfixAssignmentExpression(Token token) {
-    handleUnaryAssignmentExpression(token, false);
-  }
-
-  void handleUnaryPrefixAssignmentExpression(Token token) {
-    handleUnaryAssignmentExpression(token, true);
-  }
-
-  void endInitializers(int count, Token beginToken, Token endToken) {
-    pushNode(makeNodeList(count, beginToken, null, ','));
-  }
-
-  void handleNoInitializers() {
-    pushNode(null);
-  }
-
-  void endFields(int count, Token beginToken, Token endToken) {
-    NodeList variables = makeNodeList(count, null, endToken, ",");
-    TypeAnnotation type = popNode();
-    Modifiers modifiers = popNode();
-    pushNode(new VariableDefinitions(type, modifiers, variables));
-  }
-
-  void endMethod(Token getOrSet, Token beginToken, Token endToken) {
-    Statement body = popNode();
-    AsyncModifier asyncModifier = popNode();
-    NodeList initializers = popNode();
-    NodeList formalParameters = popNode();
-    Expression name = popNode();
-    TypeAnnotation returnType = popNode();
-    Modifiers modifiers = popNode();
-    pushNode(new FunctionExpression(name, formalParameters, body, returnType,
-                                    modifiers, initializers, getOrSet,
-                                    asyncModifier));
-  }
-
-  void handleLiteralMap(int count, Token beginToken, Token constKeyword,
-                        Token endToken) {
-    NodeList entries = makeNodeList(count, beginToken, endToken, ',');
-    NodeList typeArguments = popNode();
-    pushNode(new LiteralMap(typeArguments, entries, constKeyword));
-  }
-
-  void endLiteralMapEntry(Token colon, Token endToken) {
-    Expression value = popNode();
-    Expression key = popNode();
-    pushNode(new LiteralMapEntry(key, colon, value));
-  }
-
-  void handleLiteralList(int count, Token beginToken, Token constKeyword,
-                         Token endToken) {
-    NodeList elements = makeNodeList(count, beginToken, endToken, ',');
-    pushNode(new LiteralList(popNode(), elements, constKeyword));
-  }
-
-  void handleIndexedExpression(Token openSquareBracket,
-                               Token closeSquareBracket) {
-    NodeList arguments =
-        makeNodeList(1, openSquareBracket, closeSquareBracket, null);
-    Node receiver = popNode();
-    Token token = new StringToken.fromString(INDEX_INFO, '[]',
-                                  openSquareBracket.charOffset);
-    Node selector = new Operator(token);
-    pushNode(new Send(receiver, selector, arguments));
-  }
-
-  void handleNewExpression(Token token) {
-    NodeList arguments = popNode();
-    Node name = popNode();
-    pushNode(new NewExpression(token, new Send(null, name, arguments)));
-  }
-
-  void handleConstExpression(Token token) {
-    // [token] carries the 'const' information.
-    handleNewExpression(token);
-  }
-
-  void handleOperator(Token token) {
-    pushNode(new Operator(token));
-  }
-
-  void handleOperatorName(Token operatorKeyword, Token token) {
-    Operator op = new Operator(token);
-    pushNode(new Send(new Identifier(operatorKeyword), op, null));
-  }
-
-  void handleNamedArgument(Token colon) {
-    Expression expression = popNode();
-    Identifier name = popNode();
-    pushNode(new NamedArgument(name, colon, expression));
-  }
-
-  void endOptionalFormalParameters(int count,
-                                   Token beginToken, Token endToken) {
-    pushNode(makeNodeList(count, beginToken, endToken, ','));
-  }
-
-  void handleFunctionTypedFormalParameter(Token endToken) {
-    NodeList formals = popNode();
-    Identifier name = popNode();
-    TypeAnnotation returnType = popNode();
-    pushNode(null); // Signal "no type" to endFormalParameter.
-    pushNode(new FunctionExpression(name, formals, null, returnType,
-                                    Modifiers.EMPTY, null, null, null));
-  }
-
-  void handleValuedFormalParameter(Token equals, Token token) {
-    Expression defaultValue = popNode();
-    Expression parameterName = popNode();
-    pushNode(new SendSet(null, parameterName, new Operator(equals),
-                         new NodeList.singleton(defaultValue)));
-  }
-
-  void endTryStatement(int catchCount, Token tryKeyword, Token finallyKeyword) {
-    Block finallyBlock = null;
-    if (finallyKeyword != null) {
-      finallyBlock = popNode();
-    }
-    NodeList catchBlocks = makeNodeList(catchCount, null, null, null);
-    Block tryBlock = popNode();
-    pushNode(new TryStatement(tryBlock, catchBlocks, finallyBlock,
-                              tryKeyword, finallyKeyword));
-  }
-
-  void handleCaseMatch(Token caseKeyword, Token colon) {
-    pushNode(new CaseMatch(caseKeyword, popNode(), colon));
-  }
-
-  void handleCatchBlock(Token onKeyword, Token catchKeyword) {
-    Block block = popNode();
-    NodeList formals = catchKeyword != null? popNode(): null;
-    TypeAnnotation type = onKeyword != null ? popNode() : null;
-    pushNode(new CatchBlock(type, formals, block, onKeyword, catchKeyword));
-  }
-
-  void endSwitchStatement(Token switchKeyword, Token endToken) {
-    NodeList cases = popNode();
-    ParenthesizedExpression expression = popNode();
-    pushNode(new SwitchStatement(expression, cases, switchKeyword));
-  }
-
-  void endSwitchBlock(int caseCount, Token beginToken, Token endToken) {
-    Link<Node> caseNodes = const Link<Node>();
-    while (caseCount > 0) {
-      SwitchCase switchCase = popNode();
-      caseNodes = caseNodes.prepend(switchCase);
-      caseCount--;
-    }
-    pushNode(new NodeList(beginToken, caseNodes, endToken, null));
-  }
-
-  void handleSwitchCase(int labelCount, int caseCount,
-                        Token defaultKeyword, int statementCount,
-                        Token firstToken, Token endToken) {
-    NodeList statements = makeNodeList(statementCount, null, null, null);
-    NodeList labelsAndCases =
-        makeNodeList(labelCount + caseCount, null, null, null);
-    pushNode(new SwitchCase(labelsAndCases, defaultKeyword, statements,
-                            firstToken));
-  }
-
-  void handleBreakStatement(bool hasTarget,
-                            Token breakKeyword, Token endToken) {
-    Identifier target = null;
-    if (hasTarget) {
-      target = popNode();
-    }
-    pushNode(new BreakStatement(target, breakKeyword, endToken));
-  }
-
-  void handleContinueStatement(bool hasTarget,
-                               Token continueKeyword, Token endToken) {
-    Identifier target = null;
-    if (hasTarget) {
-      target = popNode();
-    }
-    pushNode(new ContinueStatement(target, continueKeyword, endToken));
-  }
-
-  void handleEmptyStatement(Token token) {
-    pushNode(new EmptyStatement(token));
-  }
-
-  void endFactoryMethod(Token beginToken, Token endToken) {
-    super.endFactoryMethod(beginToken, endToken);
-    Statement body = popNode();
-    AsyncModifier asyncModifier = popNode();
-    NodeList formals = popNode();
-    Node name = popNode();
-
-    // TODO(ahe): Move this parsing to the parser.
-    int modifierCount = 0;
-    Token modifier = beginToken;
-    if (modifier.stringValue == "external") {
-      handleModifier(modifier);
-      modifierCount++;
-      modifier = modifier.next;
-    }
-    if (modifier.stringValue == "const") {
-      handleModifier(modifier);
-      modifierCount++;
-      modifier = modifier.next;
-    }
-    assert(modifier.stringValue == "factory");
-    handleModifier(modifier);
-    modifierCount++;
-    handleModifiers(modifierCount);
-    Modifiers modifiers = popNode();
-
-    pushNode(new FunctionExpression(name, formals, body, null,
-                                    modifiers, null, null, asyncModifier));
-  }
-
-  void endForIn(Token awaitToken, Token forToken,
-                Token inKeyword, Token endToken) {
-    Statement body = popNode();
-    Expression expression = popNode();
-    Node declaredIdentifier = popNode();
-    if (awaitToken == null) {
-      pushNode(new SyncForIn(declaredIdentifier, expression, body,
-                             forToken, inKeyword));
-    } else {
-      pushNode(new AsyncForIn(declaredIdentifier, expression, body, awaitToken,
-                              forToken, inKeyword));
-    }
-  }
-
-  void endMetadataStar(int count, bool forParameter) {
-    // TODO(johnniwinther): Handle metadata for all node kinds.
-    if (forParameter) {
-      if (0 == count) {
-        pushNode(null);
-      } else {
-        pushNode(makeNodeList(count, null, null, ' '));
-      }
-    }
-  }
-
-  void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
-    NodeList arguments = popNode();
-    if (arguments == null) {
-      // This is a constant expression.
-      Identifier name;
-      if (periodBeforeName != null) {
-        name = popNode();
-      }
-      NodeList typeArguments = popNode();
-      Node receiver = popNode();
-      if (typeArguments != null) {
-        receiver = new TypeAnnotation(receiver, typeArguments);
-        recoverableError(typeArguments,
-                         'Type arguments are not allowed here.');
-      } else {
-        Identifier identifier = receiver.asIdentifier();
-        Send send = receiver.asSend();
-        if (identifier != null) {
-          receiver = new Send(null, identifier);
-        } else if (send == null) {
-          internalError(node: receiver);
-        }
-      }
-      Send send = receiver;
-      if (name != null) {
-        send = new Send(receiver, name);
-      }
-      pushNode(new Metadata(beginToken, send));
-    } else {
-      // This is a const constructor call.
-      endConstructorReference(beginToken, periodBeforeName, endToken);
-      Node constructor = popNode();
-      pushNode(new Metadata(beginToken,
-          new NewExpression(null,
-              new Send(null, constructor, arguments))));
-    }
-  }
-
-  void handleAssertStatement(Token assertKeyword, Token semicolonToken) {
-    NodeList arguments = popNode();
-    Node selector = new Identifier(assertKeyword);
-    Node send = new Send(null, selector, arguments);
-    pushNode(new ExpressionStatement(send, semicolonToken));
-  }
-
-  void endUnnamedFunction(Token token) {
-    Statement body = popNode();
-    AsyncModifier asyncModifier = popNode();
-    NodeList formals = popNode();
-    pushNode(new FunctionExpression(null, formals, body, null,
-                                    Modifiers.EMPTY, null, null,
-                                    asyncModifier));
-  }
-
-  void handleIsOperator(Token operathor, Token not, Token endToken) {
-    TypeAnnotation type = popNode();
-    Expression expression = popNode();
-    Node argument;
-    if (not != null) {
-      argument = new Send.prefix(type, new Operator(not));
-    } else {
-      argument = type;
-    }
-
-    NodeList arguments = new NodeList.singleton(argument);
-    pushNode(new Send(expression, new Operator(operathor), arguments));
-  }
-
-  void handleLabel(Token colon) {
-    Identifier name = popNode();
-    pushNode(new Label(name, colon));
-  }
-
-  void endLabeledStatement(int labelCount) {
-    Statement statement = popNode();
-    NodeList labels = makeNodeList(labelCount, null, null, null);
-    pushNode(new LabeledStatement(labels, statement));
-  }
-
-  void log(message) {
-    listener.log(message);
-  }
-
-  void internalError({Token token, Node node}) {
-    // TODO(ahe): This should call listener.internalError.
-    Spannable spannable = (token == null) ? node : token;
-    throw new SpannableAssertionFailure(spannable, 'Internal error in parser.');
-  }
-}
+import 'listener.dart' show
+    ParserError;
+import 'member_listener.dart' show
+    MemberListener;
+import 'node_listener.dart' show
+    NodeListener;
 
 abstract class PartialElement implements DeclarationSite {
   Token beginToken;
   Token endToken;
 
   bool hasParseError = false;
 
   bool get isErroneous => hasParseError;
 
   DeclarationSite get declarationSite => this;
@@ skipping 270 matching lines @@
   bool hasParseError = false;
 
   PartialMetadataAnnotation(this.beginToken, this.tokenAfterEndToken);
 
   bool get isErroneous => hasParseError;
 
   DeclarationSite get declarationSite => this;
 
   Token get endToken {
     Token token = beginToken;
-    while (token.kind != EOF_TOKEN) {
+    while (token.kind != Tokens.EOF_TOKEN) {
       if (identical(token.next, tokenAfterEndToken)) break;
       token = token.next;
     }
     assert(token != null);
     return token;
   }
 
   void set endToken(_) {
     throw new UnsupportedError("endToken=");
   }
@@ skipping 14 matching lines @@
   }
 
   bool get hasNode => cachedNode != null;
 
   Node get node {
     assert(invariant(this, hasNode));
     return cachedNode;
   }
 }
 
+class PartialClassElement extends ClassElementX with PartialElement {

[Johnni Winther, 2015/09/02 13:14:41]

Moved from class_element_parser.dart

+  ClassNode cachedNode;
+
+  PartialClassElement(String name,
+                      Token beginToken,
+                      Token endToken,
+                      Element enclosing,
+                      int id)
+      : super(name, enclosing, id, STATE_NOT_STARTED) {
+    this.beginToken = beginToken;
+    this.endToken = endToken;
+  }
+
+  void set supertypeLoadState(int state) {
+    assert(state == STATE_NOT_STARTED || state == supertypeLoadState + 1);
+    assert(state <= STATE_DONE);
+    super.supertypeLoadState = state;
+  }
+
+  void set resolutionState(int state) {
+    assert(state == STATE_NOT_STARTED || state == resolutionState + 1);
+    assert(state <= STATE_DONE);
+    super.resolutionState = state;
+  }
+
+  bool get hasNode => cachedNode != null;
+
+  ClassNode get node {
+    assert(invariant(this, cachedNode != null,
+        message: "Node has not been computed for $this."));
+    return cachedNode;
+  }
+
+  ClassNode parseNode(Compiler compiler) {
+    if (cachedNode != null) return cachedNode;
+    compiler.withCurrentElement(this, () {
+      compiler.parser.measure(() {
+        MemberListener listener = new MemberListener(compiler, this);
+        Parser parser = new ClassElementParser(listener);
+        try {
+          Token token = parser.parseTopLevelDeclaration(beginToken);
+          assert(identical(token, endToken.next));
+          cachedNode = listener.popNode();
+          assert(
+              invariant(
+                  beginToken, listener.nodes.isEmpty,
+                  message: "Non-empty listener stack: ${listener.nodes}"));
+        } on ParserError {
+          // TODO(ahe): Often, a ParserError is thrown while parsing the class
+          // body. This means that the stack actually contains most of the
+          // information synthesized below. Consider rewriting the parser so
+          // endClassDeclaration is called before parsing the class body.
+          Identifier name = new Identifier(findMyName(beginToken));
+          NodeList typeParameters = null;
+          Node supertype = null;
+          NodeList interfaces = listener.makeNodeList(0, null, null, ",");
+          Token extendsKeyword = null;
+          NodeList body = listener.makeNodeList(0, beginToken, endToken, null);
+          cachedNode = new ClassNode(
+              Modifiers.EMPTY, name, typeParameters, supertype, interfaces,
+              beginToken, extendsKeyword, body, endToken);
+          hasParseError = true;
+        }
+      });
+      compiler.patchParser.measure(() {
+        if (isPatched) {
+          // TODO(lrn): Perhaps extract functionality so it doesn't
+          // need compiler.
+          compiler.patchParser.parsePatchClassNode(patch);
+        }
+      });
+    });
+    return cachedNode;
+  }
+
+  Token get position => beginToken;
+
+  // TODO(johnniwinther): Ensure that modifiers are always available.
+  Modifiers get modifiers =>
+      cachedNode != null ? cachedNode.modifiers : Modifiers.EMPTY;
+
+  accept(ElementVisitor visitor, arg) {
+    return visitor.visitClassElement(this, arg);
+  }
+
+  PartialClassElement copyWithEnclosing(CompilationUnitElement enclosing) {
+    return new PartialClassElement(name, beginToken, endToken, enclosing, id);
+  }
+}
+
 Node parse(
     DiagnosticListener diagnosticListener,
     ElementX element,
     PartialElement partial,
     doParse(Parser parser)) {
   CompilationUnitElement unit = element.compilationUnit;
   NodeListener listener = new NodeListener(diagnosticListener, unit);
   listener.memberErrors = listener.memberErrors.prepend(false);
   try {
     if (partial.hasParseError) {
       listener.suppressParseErrors = true;
     }
     doParse(new Parser(listener));
   } on ParserError catch (e) {
     partial.hasParseError = true;
     return new ErrorNode(element.position, e.reason);
   }
   Node node = listener.popNode();
   assert(listener.nodes.isEmpty);
   return node;
 }