Drop of generated scanner and example scanner driver.

pkg/analyzer-experimental/lib/src/generated/parser.dart

+// This code was auto-generated, is not intended to be edited, and is subject to
+// significant change. Please see the README file for more information.
+
+library engine.parser;
+
+import 'dart:collection';
+import 'java_core.dart';
+import 'java_engine.dart';
+import 'error.dart';
+import 'source.dart';
+import 'scanner.dart';
+import 'ast.dart';
+import 'package:analyzer-experimental/src/generated/utilities_dart.dart';
+
+/**
+ * Instances of the class {@code CommentAndMetadata} implement a simple data-holder for a method
+ * that needs to return multiple values.
+ */
+class CommentAndMetadata {
+  /**
+   * The documentation comment that was parsed, or {@code null} if none was given.
+   */
+  Comment _comment;
+  /**
+   * The metadata that was parsed.
+   */
+  List<Annotation> _metadata;
+  /**
+   * Initialize a newly created holder with the given data.
+   * @param comment the documentation comment that was parsed
+   * @param metadata the metadata that was parsed
+   */
+  CommentAndMetadata(Comment comment, List<Annotation> metadata) {
+    this._comment = comment;
+    this._metadata = metadata;
+  }
+  /**
+   * Return the documentation comment that was parsed, or {@code null} if none was given.
+   * @return the documentation comment that was parsed
+   */
+  Comment get comment => _comment;
+  /**
+   * Return the metadata that was parsed. If there was no metadata, then the list will be empty.
+   * @return the metadata that was parsed
+   */
+  List<Annotation> get metadata => _metadata;
+}
+/**
+ * Instances of the class {@code FinalConstVarOrType} implement a simple data-holder for a method
+ * that needs to return multiple values.
+ */
+class FinalConstVarOrType {
+  /**
+   * The 'final', 'const' or 'var' keyword, or {@code null} if none was given.
+   */
+  Token _keyword;
+  /**
+   * The type, of {@code null} if no type was specified.
+   */
+  TypeName _type;
+  /**
+   * Initialize a newly created holder with the given data.
+   * @param keyword the 'final', 'const' or 'var' keyword
+   * @param type the type
+   */
+  FinalConstVarOrType(Token keyword, TypeName type) {
+    this._keyword = keyword;
+    this._type = type;
+  }
+  /**
+   * Return the 'final', 'const' or 'var' keyword, or {@code null} if none was given.
+   * @return the 'final', 'const' or 'var' keyword
+   */
+  Token get keyword => _keyword;
+  /**
+   * Return the type, of {@code null} if no type was specified.
+   * @return the type
+   */
+  TypeName get type => _type;
+}
+/**
+ * Instances of the class {@code Modifiers} implement a simple data-holder for a method that needs
+ * to return multiple values.
+ */
+class Modifiers {
+  /**
+   * The token representing the keyword 'abstract', or {@code null} if the keyword was not found.
+   */
+  Token _abstractKeyword;
+  /**
+   * The token representing the keyword 'const', or {@code null} if the keyword was not found.
+   */
+  Token _constKeyword;
+  /**
+   * The token representing the keyword 'external', or {@code null} if the keyword was not found.
+   */
+  Token _externalKeyword;
+  /**
+   * The token representing the keyword 'factory', or {@code null} if the keyword was not found.
+   */
+  Token _factoryKeyword;
+  /**
+   * The token representing the keyword 'final', or {@code null} if the keyword was not found.
+   */
+  Token _finalKeyword;
+  /**
+   * The token representing the keyword 'static', or {@code null} if the keyword was not found.
+   */
+  Token _staticKeyword;
+  /**
+   * The token representing the keyword 'var', or {@code null} if the keyword was not found.
+   */
+  Token _varKeyword;
+  /**
+   * Initialize a newly created and empty set of modifiers.
+   */
+  Modifiers() : super() {
+  }
+  /**
+   * Return the token representing the keyword 'abstract', or {@code null} if the keyword was not
+   * found.
+   * @return the token representing the keyword 'abstract'
+   */
+  Token get abstractKeyword => _abstractKeyword;
+  /**
+   * Return the token representing the keyword 'const', or {@code null} if the keyword was not
+   * found.
+   * @return the token representing the keyword 'const'
+   */
+  Token get constKeyword => _constKeyword;
+  /**
+   * Return the token representing the keyword 'external', or {@code null} if the keyword was not
+   * found.
+   * @return the token representing the keyword 'external'
+   */
+  Token get externalKeyword => _externalKeyword;
+  /**
+   * Return the token representing the keyword 'factory', or {@code null} if the keyword was not
+   * found.
+   * @return the token representing the keyword 'factory'
+   */
+  Token get factoryKeyword => _factoryKeyword;
+  /**
+   * Return the token representing the keyword 'final', or {@code null} if the keyword was not
+   * found.
+   * @return the token representing the keyword 'final'
+   */
+  Token get finalKeyword => _finalKeyword;
+  /**
+   * Return the token representing the keyword 'static', or {@code null} if the keyword was not
+   * found.
+   * @return the token representing the keyword 'static'
+   */
+  Token get staticKeyword => _staticKeyword;
+  /**
+   * Return the token representing the keyword 'var', or {@code null} if the keyword was not found.
+   * @return the token representing the keyword 'var'
+   */
+  Token get varKeyword => _varKeyword;
+  /**
+   * Set the token representing the keyword 'abstract' to the given token.
+   * @param abstractKeyword the token representing the keyword 'abstract'
+   */
+  void set abstractKeyword4(Token abstractKeyword) {
+    this._abstractKeyword = abstractKeyword;
+  }
+  /**
+   * Set the token representing the keyword 'const' to the given token.
+   * @param constKeyword the token representing the keyword 'const'
+   */
+  void set constKeyword3(Token constKeyword) {
+    this._constKeyword = constKeyword;
+  }
+  /**
+   * Set the token representing the keyword 'external' to the given token.
+   * @param externalKeyword the token representing the keyword 'external'
+   */
+  void set externalKeyword5(Token externalKeyword) {
+    this._externalKeyword = externalKeyword;
+  }
+  /**
+   * Set the token representing the keyword 'factory' to the given token.
+   * @param factoryKeyword the token representing the keyword 'factory'
+   */
+  void set factoryKeyword3(Token factoryKeyword) {
+    this._factoryKeyword = factoryKeyword;
+  }
+  /**
+   * Set the token representing the keyword 'final' to the given token.
+   * @param finalKeyword the token representing the keyword 'final'
+   */
+  void set finalKeyword2(Token finalKeyword) {
+    this._finalKeyword = finalKeyword;
+  }
+  /**
+   * Set the token representing the keyword 'static' to the given token.
+   * @param staticKeyword the token representing the keyword 'static'
+   */
+  void set staticKeyword2(Token staticKeyword) {
+    this._staticKeyword = staticKeyword;
+  }
+  /**
+   * Set the token representing the keyword 'var' to the given token.
+   * @param varKeyword the token representing the keyword 'var'
+   */
+  void set varKeyword2(Token varKeyword) {
+    this._varKeyword = varKeyword;
+  }
+  String toString() {
+    StringBuffer builder = new StringBuffer();
+    bool needsSpace = appendKeyword(builder, false, _abstractKeyword);
+    needsSpace = appendKeyword(builder, needsSpace, _constKeyword);
+    needsSpace = appendKeyword(builder, needsSpace, _externalKeyword);
+    needsSpace = appendKeyword(builder, needsSpace, _factoryKeyword);
+    needsSpace = appendKeyword(builder, needsSpace, _finalKeyword);
+    needsSpace = appendKeyword(builder, needsSpace, _staticKeyword);
+    appendKeyword(builder, needsSpace, _varKeyword);
+    return builder.toString();
+  }
+  /**
+   * If the given keyword is not {@code null}, append it to the given builder, prefixing it with a
+   * space if needed.
+   * @param builder the builder to which the keyword will be appended
+   * @param needsSpace {@code true} if the keyword needs to be prefixed with a space
+   * @param keyword the keyword to be appended
+   * @return {@code true} if subsequent keywords need to be prefixed with a space
+   */
+  bool appendKeyword(StringBuffer builder, bool needsSpace, Token keyword) {
+    if (keyword != null) {
+      if (needsSpace) {
+        builder.addCharCode(0x20);
+      }
+      builder.add(keyword.lexeme);
+      return true;
+    }
+    return needsSpace;
+  }
+}
+/**
+ * Instances of the class {@code Parser} are used to parse tokens into an AST structure.
+ */
+class Parser {
+  /**
+   * The source being parsed.
+   */
+  Source _source;
+  /**
+   * The error listener that will be informed of any errors that are found during the parse.
+   */
+  AnalysisErrorListener _errorListener;
+  /**
+   * The next token to be parsed.
+   */
+  Token _currentToken;
+  /**
+   * A flag indicating whether the parser is currently in the body of a loop.
+   */
+  bool _inLoop = false;
+  /**
+   * A flag indicating whether the parser is currently in a switch statement.
+   */
+  bool _inSwitch = false;
+  static String _HIDE = "hide";
+  static String _OF = "of";
+  static String _ON = "on";
+  static String _SHOW = "show";
+  /**
+   * Initialize a newly created parser.
+   * @param source the source being parsed
+   * @param errorListener the error listener that will be informed of any errors that are found
+   * during the parse
+   */
+  Parser(Source source, AnalysisErrorListener errorListener) {
+    this._source = source;
+    this._errorListener = errorListener;
+  }
+  /**
+   * Parse a compilation unit, starting with the given token.
+   * @param token the first token of the compilation unit
+   * @return the compilation unit that was parsed
+   */
+  CompilationUnit parseCompilationUnit(Token token) {
+    _currentToken = token;
+    return parseCompilationUnit2();
+  }
+  /**
+   * Parse an expression, starting with the given token.
+   * @param token the first token of the expression
+   * @return the expression that was parsed, or {@code null} if the tokens do not represent a
+   * recognizable expression
+   */
+  Expression parseExpression(Token token) {
+    _currentToken = token;
+    return parseExpression2();
+  }
+  /**
+   * Parse a statement, starting with the given token.
+   * @param token the first token of the statement
+   * @return the statement that was parsed, or {@code null} if the tokens do not represent a
+   * recognizable statement
+   */
+  Statement parseStatement(Token token) {
+    _currentToken = token;
+    return parseStatement2();
+  }
+  /**
+   * Parse a sequence of statements, starting with the given token.
+   * @param token the first token of the sequence of statement
+   * @return the statements that were parsed, or {@code null} if the tokens do not represent a
+   * recognizable sequence of statements
+   */
+  List<Statement> parseStatements(Token token) {
+    _currentToken = token;
+    return parseStatements2();
+  }
+  void set currentToken(Token currentToken) {
+    this._currentToken = currentToken;
+  }
+  /**
+   * Advance to the next token in the token stream.
+   */
+  void advance() {
+    _currentToken = _currentToken.next;
+  }
+  /**
+   * Append the character equivalent of the given scalar value to the given builder. Use the start
+   * and end indices to report an error, and don't append anything to the builder, if the scalar
+   * value is invalid.
+   * @param builder the builder to which the scalar value is to be appended
+   * @param escapeSequence the escape sequence that was parsed to produce the scalar value
+   * @param scalarValue the value to be appended
+   * @param startIndex the index of the first character representing the scalar value
+   * @param endIndex the index of the last character representing the scalar value
+   */
+  void appendScalarValue(StringBuffer builder, String escapeSequence, int scalarValue, int startIndex, int endIndex) {
+    if (scalarValue < 0 || scalarValue > Character.MAX_CODE_POINT || (scalarValue >= 0xD800 && scalarValue <= 0xDFFF)) {
+      reportError3(ParserErrorCode.INVALID_CODE_POINT, [escapeSequence]);
+      return;
+    }
+    if (scalarValue < Character.MAX_VALUE) {
+      builder.addCharCode(scalarValue as int);
+    } else {
+      builder.add(Character.toChars(scalarValue));
+    }
+  }
+  /**
+   * Compute the content of a string with the given literal representation.
+   * @param lexeme the literal representation of the string
+   * @return the actual value of the string
+   */
+  String computeStringValue(String lexeme) {
+    if (lexeme.startsWith("r\"\"\"") || lexeme.startsWith("r'''")) {
+      if (lexeme.length > 4) {
+        return lexeme.substring(4, lexeme.length - 3);
+      }
+    } else if (lexeme.startsWith("r\"") || lexeme.startsWith("r'")) {
+      if (lexeme.length > 2) {
+        return lexeme.substring(2, lexeme.length - 1);
+      }
+    }
+    int start = 0;
+    if (lexeme.startsWith("\"\"\"") || lexeme.startsWith("'''")) {
+      start += 3;
+    } else if (lexeme.startsWith("\"") || lexeme.startsWith("'")) {
+      start += 1;
+    }
+    int end = lexeme.length;
+    if (end > 3 && (lexeme.endsWith("\"\"\"") || lexeme.endsWith("'''"))) {
+      end -= 3;
+    } else if (end > 1 && (lexeme.endsWith("\"") || lexeme.endsWith("'"))) {
+      end -= 1;
+    }
+    StringBuffer builder = new StringBuffer();
+    int index = start;
+    while (index < end) {
+      index = translateCharacter(builder, lexeme, index);
+    }
+    return builder.toString();
+  }
+  /**
+   * Create a synthetic identifier.
+   * @return the synthetic identifier that was created
+   */
+  SimpleIdentifier createSyntheticIdentifier() => new SimpleIdentifier(createSyntheticToken(TokenType.IDENTIFIER));
+  /**
+   * Create a synthetic string literal.
+   * @return the synthetic string literal that was created
+   */
+  SimpleStringLiteral createSyntheticStringLiteral() => new SimpleStringLiteral(createSyntheticToken(TokenType.STRING), "");
+  /**
+   * Create a synthetic token with the given type.
+   * @return the synthetic token that was created
+   */
+  Token createSyntheticToken(TokenType type) => new StringToken(type, "", _currentToken.offset);
+  /**
+   * Check that the given expression is assignable and report an error if it isn't.
+   * <pre>
+   * assignableExpression ::=
+   * primary (arguments* assignableSelector)+
+   * | 'super' assignableSelector
+   * | identifier
+   * assignableSelector ::=
+   * '[' expression ']'
+   * | '.' identifier
+   * </pre>
+   * @param expression the expression being checked
+   */
+  void ensureAssignable(Expression expression) {
+    if (expression != null && !expression.isAssignable()) {
+      reportError3(ParserErrorCode.ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE, []);
+    }
+  }
+  /**
+   * If the current token is a keyword matching the given string, return it after advancing to the
+   * next token. Otherwise report an error and return the current token without advancing.
+   * @param keyword the keyword that is expected
+   * @return the token that matched the given type
+   */
+  Token expect(Keyword keyword) {
+    if (matches(keyword)) {
+      return andAdvance;
+    }
+    reportError3(ParserErrorCode.EXPECTED_TOKEN, [keyword.syntax]);
+    return _currentToken;
+  }
+  /**
+   * If the current token has the expected type, return it after advancing to the next token.
+   * Otherwise report an error and return the current token without advancing.
+   * @param type the type of token that is expected
+   * @return the token that matched the given type
+   */
+  Token expect2(TokenType type) {
+    if (matches5(type)) {
+      return andAdvance;
+    }
+    if (type == TokenType.SEMICOLON) {
+      reportError4(ParserErrorCode.EXPECTED_TOKEN, _currentToken.previous, [type.lexeme]);
+    } else {
+      reportError3(ParserErrorCode.EXPECTED_TOKEN, [type.lexeme]);
+    }
+    return _currentToken;
+  }
+  /**
+   * Advance to the next token in the token stream, making it the new current token.
+   * @return the token that was current before this method was invoked
+   */
+  Token get andAdvance {
+    Token token = _currentToken;
+    advance();
+    return token;
+  }
+  /**
+   * Return {@code true} if the current token is the first token of a return type that is followed
+   * by an identifier, possibly followed by a list of type parameters, followed by a
+   * left-parenthesis. This is used by parseTypeAlias to determine whether or not to parse a return
+   * type.
+   * @return {@code true} if we can successfully parse the rest of a type alias if we first parse a
+   * return type.
+   */
+  bool hasReturnTypeInTypeAlias() {
+    Token next = skipReturnType(_currentToken);
+    if (next == null) {
+      return false;
+    }
+    return matchesIdentifier2(next);
+  }
+  /**
+   * Return {@code true} if the current token appears to be the beginning of a function declaration.
+   * @return {@code true} if the current token appears to be the beginning of a function declaration
+   */
+  bool isFunctionDeclaration() {
+    if (matches(Keyword.VOID)) {
+      return true;
+    }
+    Token afterReturnType = skipTypeName(_currentToken);
+    if (afterReturnType == null) {
+      afterReturnType = _currentToken;
+    }
+    Token afterIdentifier = skipSimpleIdentifier(afterReturnType);
+    if (afterIdentifier == null) {
+      afterIdentifier = skipSimpleIdentifier(_currentToken);
+    }
+    if (afterIdentifier == null) {
+      return false;
+    }
+    return isFunctionExpression(afterIdentifier);
+  }
+  /**
+   * Return {@code true} if the given token appears to be the beginning of a function expression.
+   * @param startToken the token that might be the start of a function expression
+   * @return {@code true} if the given token appears to be the beginning of a function expression
+   */
+  bool isFunctionExpression(Token startToken) {
+    Token afterParameters = skipFormalParameterList(startToken);
+    if (afterParameters == null) {
+      return false;
+    }
+    return matchesAny(afterParameters, [TokenType.OPEN_CURLY_BRACKET, TokenType.FUNCTION]);
+  }
+  /**
+   * Return {@code true} if the given character is a valid hexadecimal digit.
+   * @param character the character being tested
+   * @return {@code true} if the character is a valid hexadecimal digit
+   */
+  bool isHexDigit(int character) => (0x30 <= character && character <= 0x39) || (0x41 <= character && character <= 0x46) || (0x61 <= character && character <= 0x66);
+  /**
+   * Return {@code true} if the current token is the first token in an initialized variable
+   * declaration rather than an expression. This method assumes that we have already skipped past
+   * any metadata that might be associated with the declaration.
+   * <pre>
+   * initializedVariableDeclaration ::=
+   * declaredIdentifier ('=' expression)? (',' initializedIdentifier)
+   * declaredIdentifier ::=
+   * metadata finalConstVarOrType identifier
+   * finalConstVarOrType ::=
+   * 'final' type?
+   * | 'const' type?
+   * | 'var'
+   * | type
+   * type ::=
+   * qualified typeArguments?
+   * initializedIdentifier ::=
+   * identifier ('=' expression)?
+   * </pre>
+   * @return {@code true} if the current token is the first token in an initialized variable
+   * declaration
+   */
+  bool isInitializedVariableDeclaration() {
+    if (matches(Keyword.FINAL) || matches(Keyword.CONST) || matches(Keyword.VAR)) {
+      return true;
+    }
+    Token token = skipTypeName(_currentToken);
+    if (token == null) {
+      return false;
+    }
+    token = skipSimpleIdentifier(token);
+    if (token == null) {
+      return false;
+    }
+    TokenType type17 = token.type;
+    return type17 == TokenType.EQ || type17 == TokenType.COMMA || type17 == TokenType.SEMICOLON || matches3(token, Keyword.IN);
+  }
+  /**
+   * Return {@code true} if the current token appears to be the beginning of a switch member.
+   * @return {@code true} if the current token appears to be the beginning of a switch member
+   */
+  bool isSwitchMember() {
+    Token token = _currentToken;
+    while (matches4(token, TokenType.IDENTIFIER) && matches4(token.next, TokenType.COLON)) {
+      token = token.next.next;
+    }
+    if (token.type == TokenType.KEYWORD) {
+      Keyword keyword28 = (token as KeywordToken).keyword;
+      return keyword28 == Keyword.CASE || keyword28 == Keyword.DEFAULT;
+    }
+    return false;
+  }
+  /**
+   * Compare the given tokens to find the token that appears first in the source being parsed. That
+   * is, return the left-most of all of the tokens. The arguments are allowed to be {@code null}.
+   * Return the token with the smallest offset, or {@code null} if there are no arguments or if all
+   * of the arguments are {@code null}.
+   * @param tokens the tokens being compared
+   * @return the token with the smallest offset
+   */
+  Token lexicallyFirst(List<Token> tokens) {
+    Token first = null;
+    int firstOffset = 2147483647;
+    for (Token token in tokens) {
+      if (token != null) {
+        int offset3 = token.offset;
+        if (offset3 < firstOffset) {
+          first = token;
+        }
+      }
+    }
+    return first;
+  }
+  /**
+   * Return {@code true} if the current token matches the given keyword.
+   * @param keyword the keyword that can optionally appear in the current location
+   * @return {@code true} if the current token matches the given keyword
+   */
+  bool matches(Keyword keyword) => matches3(_currentToken, keyword);
+  /**
+   * Return {@code true} if the current token matches the given identifier.
+   * @param identifier the identifier that can optionally appear in the current location
+   * @return {@code true} if the current token matches the given identifier
+   */
+  bool matches2(String identifier) => _currentToken.type == TokenType.IDENTIFIER && _currentToken.lexeme == identifier;
+  /**
+   * Return {@code true} if the given token matches the given keyword.
+   * @param token the token being tested
+   * @param keyword the keyword that is being tested for
+   * @return {@code true} if the given token matches the given keyword
+   */
+  bool matches3(Token token, Keyword keyword) => token.type == TokenType.KEYWORD && (token as KeywordToken).keyword == keyword;
+  /**
+   * Return {@code true} if the given token has the given type.
+   * @param token the token being tested
+   * @param type the type of token that is being tested for
+   * @return {@code true} if the given token has the given type
+   */
+  bool matches4(Token token, TokenType type) => token.type == type;
+  /**
+   * Return {@code true} if the current token has the given type. Note that this method, unlike
+   * other variants, will modify the token stream if possible to match a wider range of tokens. In
+   * particular, if we are attempting to match a '>' and the next token is either a '>>' or '>>>',
+   * the token stream will be re-written and {@code true} will be returned.
+   * @param type the type of token that can optionally appear in the current location
+   * @return {@code true} if the current token has the given type
+   */
+  bool matches5(TokenType type) {
+    TokenType currentType = _currentToken.type;
+    if (currentType != type) {
+      if (type == TokenType.GT) {
+        if (currentType == TokenType.GT_GT) {
+          int offset4 = _currentToken.offset;
+          Token first = new Token(TokenType.GT, offset4);
+          Token second = new Token(TokenType.GT, offset4 + 1);
+          second.setNext(_currentToken.next);
+          first.setNext(second);
+          _currentToken.previous.setNext(first);
+          _currentToken = first;
+          return true;
+        } else if (currentType == TokenType.GT_EQ) {
+          int offset5 = _currentToken.offset;
+          Token first = new Token(TokenType.GT, offset5);
+          Token second = new Token(TokenType.EQ, offset5 + 1);
+          second.setNext(_currentToken.next);
+          first.setNext(second);
+          _currentToken.previous.setNext(first);
+          _currentToken = first;
+          return true;
+        } else if (currentType == TokenType.GT_GT_EQ) {
+          int offset6 = _currentToken.offset;
+          Token first = new Token(TokenType.GT, offset6);
+          Token second = new Token(TokenType.GT, offset6 + 1);
+          Token third = new Token(TokenType.EQ, offset6 + 2);
+          third.setNext(_currentToken.next);
+          second.setNext(third);
+          first.setNext(second);
+          _currentToken.previous.setNext(first);
+          _currentToken = first;
+          return true;
+        }
+      }
+      return false;
+    }
+    return true;
+  }
+  /**
+   * Return {@code true} if the given token has any one of the given types.
+   * @param token the token being tested
+   * @param types the types of token that are being tested for
+   * @return {@code true} if the given token has any of the given types
+   */
+  bool matchesAny(Token token, List<TokenType> types) {
+    TokenType actualType = token.type;
+    for (TokenType type in types) {
+      if (actualType == type) {
+        return true;
+      }
+    }
+    return false;
+  }
+  /**
+   * Return {@code true} if the current token is a valid identifier. Valid identifiers include
+   * built-in identifiers (pseudo-keywords).
+   * @return {@code true} if the current token is a valid identifier
+   */
+  bool matchesIdentifier() => matchesIdentifier2(_currentToken);
+  /**
+   * Return {@code true} if the given token is a valid identifier. Valid identifiers include
+   * built-in identifiers (pseudo-keywords).
+   * @return {@code true} if the given token is a valid identifier
+   */
+  bool matchesIdentifier2(Token token) => matches4(token, TokenType.IDENTIFIER) || (matches4(token, TokenType.KEYWORD) && (token as KeywordToken).keyword.isPseudoKeyword());
+  /**
+   * If the current token has the given type, then advance to the next token and return {@code true}. Otherwise, return {@code false} without advancing.
+   * @param type the type of token that can optionally appear in the current location
+   * @return {@code true} if the current token has the given type
+   */
+  bool optional(TokenType type) {
+    if (matches5(type)) {
+      advance();
+      return true;
+    }
+    return false;
+  }
+  /**
+   * Parse an additive expression.
+   * <pre>
+   * additiveExpression ::=
+   * multiplicativeExpression (additiveOperator multiplicativeExpression)
+   * | 'super' (additiveOperator multiplicativeExpression)+
+   * </pre>
+   * @return the additive expression that was parsed
+   */
+  Expression parseAdditiveExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && _currentToken.next.type.isAdditiveOperator()) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseMultiplicativeExpression();
+    }
+    while (_currentToken.type.isAdditiveOperator()) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseMultiplicativeExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse an annotation.
+   * <pre>
+   * annotation ::=
+   * '@' qualified (‘.’ identifier)? arguments?
+   * </pre>
+   * @return the annotation that was parsed
+   */
+  Annotation parseAnnotation() {
+    Token atSign = expect2(TokenType.AT);
+    Identifier name = parsePrefixedIdentifier();
+    Token period = null;
+    SimpleIdentifier constructorName = null;
+    if (matches5(TokenType.PERIOD)) {
+      period = andAdvance;
+      constructorName = parseSimpleIdentifier();
+    }
+    ArgumentList arguments = null;
+    if (matches5(TokenType.OPEN_PAREN)) {
+      arguments = parseArgumentList();
+    }
+    return new Annotation(atSign, name, period, constructorName, arguments);
+  }
+  /**
+   * Parse an argument.
+   * <pre>
+   * argument ::=
+   * namedArgument
+   * | expression
+   * namedArgument ::=
+   * label expression
+   * </pre>
+   * @return the argument that was parsed
+   */
+  Expression parseArgument() {
+    if (matchesIdentifier() && matches4(peek(), TokenType.COLON)) {
+      SimpleIdentifier label = new SimpleIdentifier(andAdvance);
+      Label name = new Label(label, andAdvance);
+      return new NamedExpression(name, parseExpression2());
+    } else {
+      return parseExpression2();
+    }
+  }
+  /**
+   * Parse an argument definition test.
+   * <pre>
+   * argumentDefinitionTest ::=
+   * '?' identifier
+   * </pre>
+   * @return the argument definition test that was parsed
+   */
+  ArgumentDefinitionTest parseArgumentDefinitionTest() {
+    Token question = expect2(TokenType.QUESTION);
+    SimpleIdentifier identifier = parseSimpleIdentifier();
+    return new ArgumentDefinitionTest(question, identifier);
+  }
+  /**
+   * Parse a list of arguments.
+   * <pre>
+   * arguments ::=
+   * '(' argumentList? ')'
+   * argumentList ::=
+   * namedArgument (',' namedArgument)
+   * | expressionList (',' namedArgument)
+   * </pre>
+   * @return the argument list that was parsed
+   */
+  ArgumentList parseArgumentList() {
+    Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+    List<Expression> arguments = new List<Expression>();
+    if (matches5(TokenType.CLOSE_PAREN)) {
+      return new ArgumentList(leftParenthesis, arguments, andAdvance);
+    }
+    Expression argument = parseArgument();
+    arguments.add(argument);
+    bool foundNamedArgument = argument is NamedExpression;
+    bool generatedError = false;
+    while (optional(TokenType.COMMA)) {
+      argument = parseArgument();
+      arguments.add(argument);
+      if (foundNamedArgument) {
+        if (!generatedError && argument is! NamedExpression) {
+          reportError3(ParserErrorCode.POSITIONAL_AFTER_NAMED_ARGUMENT, []);
+          generatedError = true;
+        }
+      } else if (argument is NamedExpression) {
+        foundNamedArgument = true;
+      }
+    }
+    Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+    return new ArgumentList(leftParenthesis, arguments, rightParenthesis);
+  }
+  /**
+   * Parse an assert statement.
+   * <pre>
+   * assertStatement ::=
+   * 'assert' '(' conditionalExpression ')' ';'
+   * </pre>
+   * @return the assert statement
+   */
+  AssertStatement parseAssertStatement() {
+    Token keyword = expect(Keyword.ASSERT);
+    Token leftParen = expect2(TokenType.OPEN_PAREN);
+    Expression expression = parseConditionalExpression();
+    Token rightParen = expect2(TokenType.CLOSE_PAREN);
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new AssertStatement(keyword, leftParen, expression, rightParen, semicolon);
+  }
+  /**
+   * Parse an assignable expression.
+   * <pre>
+   * assignableExpression ::=
+   * primary (arguments* assignableSelector)+
+   * | 'super' assignableSelector
+   * | identifier
+   * </pre>
+   * @param primaryAllowed {@code true} if the expression is allowed to be a primary without any
+   * assignable selector
+   * @return the assignable expression that was parsed
+   */
+  Expression parseAssignableExpression(bool primaryAllowed) {
+    if (matches(Keyword.SUPER)) {
+      return parseAssignableSelector(new SuperExpression(andAdvance), false);
+    }
+    Expression expression = parsePrimaryExpression();
+    bool isOptional = primaryAllowed || expression is SimpleIdentifier;
+    while (true) {
+      while (matches5(TokenType.OPEN_PAREN)) {
+        ArgumentList argumentList = parseArgumentList();
+        if (expression is SimpleIdentifier) {
+          expression = new MethodInvocation(null, null, expression as SimpleIdentifier, argumentList);
+        } else if (expression is PrefixedIdentifier) {
+          PrefixedIdentifier identifier = expression as PrefixedIdentifier;
+          expression = new MethodInvocation(identifier.prefix, identifier.period, identifier.identifier, argumentList);
+        } else if (expression is PropertyAccess) {
+          PropertyAccess access = expression as PropertyAccess;
+          expression = new MethodInvocation(access.target, access.operator, access.propertyName, argumentList);
+        } else {
+          expression = new FunctionExpressionInvocation(expression, argumentList);
+        }
+        if (!primaryAllowed) {
+          isOptional = false;
+        }
+      }
+      Expression selectorExpression = parseAssignableSelector(expression, isOptional || (expression is PrefixedIdentifier));
+      if (selectorExpression == expression) {
+        if (!isOptional && (expression is PrefixedIdentifier)) {
+          PrefixedIdentifier identifier = expression as PrefixedIdentifier;
+          expression = new PropertyAccess(identifier.prefix, identifier.period, identifier.identifier);
+        }
+        return expression;
+      }
+      expression = selectorExpression;
+      isOptional = true;
+    }
+  }
+  /**
+   * Parse an assignable selector.
+   * <pre>
+   * assignableSelector ::=
+   * '[' expression ']'
+   * | '.' identifier
+   * </pre>
+   * @param prefix the expression preceding the selector
+   * @param optional {@code true} if the selector is optional
+   * @return the assignable selector that was parsed
+   */
+  Expression parseAssignableSelector(Expression prefix, bool optional) {
+    if (matches5(TokenType.OPEN_SQUARE_BRACKET)) {
+      Token leftBracket = andAdvance;
+      Expression index = parseExpression2();
+      Token rightBracket = expect2(TokenType.CLOSE_SQUARE_BRACKET);
+      return new IndexExpression.con1(prefix, leftBracket, index, rightBracket);
+    } else if (matches5(TokenType.PERIOD)) {
+      Token period = andAdvance;
+      return new PropertyAccess(prefix, period, parseSimpleIdentifier());
+    } else {
+      if (!optional) {
+        reportError3(ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR, []);
+      }
+      return prefix;
+    }
+  }
+  /**
+   * Parse a bitwise and expression.
+   * <pre>
+   * bitwiseAndExpression ::=
+   * equalityExpression ('&' equalityExpression)
+   * | 'super' ('&' equalityExpression)+
+   * </pre>
+   * @return the bitwise and expression that was parsed
+   */
+  Expression parseBitwiseAndExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && matches4(peek(), TokenType.AMPERSAND)) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseEqualityExpression();
+    }
+    while (matches5(TokenType.AMPERSAND)) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseEqualityExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a bitwise or expression.
+   * <pre>
+   * bitwiseOrExpression ::=
+   * bitwiseXorExpression ('|' bitwiseXorExpression)
+   * | 'super' ('|' bitwiseXorExpression)+
+   * </pre>
+   * @return the bitwise or expression that was parsed
+   */
+  Expression parseBitwiseOrExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && matches4(peek(), TokenType.BAR)) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseBitwiseXorExpression();
+    }
+    while (matches5(TokenType.BAR)) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseBitwiseXorExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a bitwise exclusive-or expression.
+   * <pre>
+   * bitwiseXorExpression ::=
+   * bitwiseAndExpression ('^' bitwiseAndExpression)
+   * | 'super' ('^' bitwiseAndExpression)+
+   * </pre>
+   * @return the bitwise exclusive-or expression that was parsed
+   */
+  Expression parseBitwiseXorExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && matches4(peek(), TokenType.CARET)) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseBitwiseAndExpression();
+    }
+    while (matches5(TokenType.CARET)) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseBitwiseAndExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a block.
+   * <pre>
+   * block ::=
+   * '{' statements '}'
+   * </pre>
+   * @return the block that was parsed
+   */
+  Block parseBlock() {
+    Token leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
+    List<Statement> statements = new List<Statement>();
+    Token statementStart = _currentToken;
+    while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET)) {
+      Statement statement = parseStatement2();
+      if (statement != null) {
+        statements.add(statement);
+      }
+      if (_currentToken == statementStart) {
+        reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+        advance();
+      }
+      statementStart = _currentToken;
+    }
+    Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
+    return new Block(leftBracket, statements, rightBracket);
+  }
+  /**
+   * Parse a break statement.
+   * <pre>
+   * breakStatement ::=
+   * 'break' identifier? ';'
+   * </pre>
+   * @return the break statement that was parsed
+   */
+  Statement parseBreakStatement() {
+    Token breakKeyword = expect(Keyword.BREAK);
+    SimpleIdentifier label = null;
+    if (matchesIdentifier()) {
+      label = parseSimpleIdentifier();
+    }
+    if (!_inLoop && !_inSwitch && label == null) {
+      reportError4(ParserErrorCode.BREAK_OUTSIDE_OF_LOOP, breakKeyword, []);
+    }
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new BreakStatement(breakKeyword, label, semicolon);
+  }
+  /**
+   * Parse a cascade section.
+   * <pre>
+   * cascadeSection ::=
+   * '..' cascadeSelector arguments* (assignableSelector arguments*)* cascadeAssignment?
+   * cascadeSelector ::=
+   * '[' expression ']'
+   * | identifier
+   * cascadeAssignment ::=
+   * assignmentOperator expressionWithoutCascade
+   * </pre>
+   * @return the expression representing the cascaded method invocation
+   */
+  Expression parseCascadeSection() {
+    Token period = expect2(TokenType.PERIOD_PERIOD);
+    Expression expression = null;
+    SimpleIdentifier functionName = null;
+    if (matchesIdentifier()) {
+      functionName = parseSimpleIdentifier();
+    } else if (_currentToken.type == TokenType.OPEN_SQUARE_BRACKET) {
+      Token leftBracket = andAdvance;
+      Expression index = parseExpression2();
+      Token rightBracket = expect2(TokenType.CLOSE_SQUARE_BRACKET);
+      expression = new IndexExpression.con2(period, leftBracket, index, rightBracket);
+      period = null;
+    } else {
+      reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+      return expression;
+    }
+    if (_currentToken.type == TokenType.OPEN_PAREN) {
+      while (_currentToken.type == TokenType.OPEN_PAREN) {
+        if (functionName != null) {
+          expression = new MethodInvocation(expression, period, functionName, parseArgumentList());
+          period = null;
+          functionName = null;
+        } else if (expression == null) {
+          return null;
+        } else {
+          expression = new FunctionExpressionInvocation(expression, parseArgumentList());
+        }
+      }
+    } else if (functionName != null) {
+      expression = new PropertyAccess(expression, period, functionName);
+      period = null;
+    }
+    bool progress = true;
+    while (progress) {
+      progress = false;
+      Expression selector = parseAssignableSelector(expression, true);
+      if (selector != expression) {
+        expression = selector;
+        progress = true;
+        while (_currentToken.type == TokenType.OPEN_PAREN) {
+          expression = new FunctionExpressionInvocation(expression, parseArgumentList());
+        }
+      }
+    }
+    if (_currentToken.type.isAssignmentOperator()) {
+      Token operator = andAdvance;
+      ensureAssignable(expression);
+      expression = new AssignmentExpression(expression, operator, parseExpression2());
+    }
+    return expression;
+  }
+  /**
+   * Parse a class declaration.
+   * <pre>
+   * classDeclaration ::=
+   * metadata 'abstract'? 'class' name typeParameterList? (extendsClause withClause?)? implementsClause? '{' classMembers '}'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the member
+   * @param abstractKeyword the token for the keyword 'abstract', or {@code null} if the keyword was
+   * not given
+   * @return the class declaration that was parsed
+   */
+  ClassDeclaration parseClassDeclaration(CommentAndMetadata commentAndMetadata, Token abstractKeyword) {
+    Token keyword = expect(Keyword.CLASS);
+    SimpleIdentifier name = parseSimpleIdentifier2(ParserErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE_NAME);
+    String className = name.name;
+    TypeParameterList typeParameters = null;
+    if (matches5(TokenType.LT)) {
+      typeParameters = parseTypeParameterList();
+    }
+    ExtendsClause extendsClause = null;
+    WithClause withClause = null;
+    ImplementsClause implementsClause = null;
+    bool foundClause = true;
+    while (foundClause) {
+      if (matches(Keyword.EXTENDS)) {
+        if (extendsClause == null) {
+          extendsClause = parseExtendsClause();
+          if (withClause != null) {
+            reportError4(ParserErrorCode.WITH_BEFORE_EXTENDS, withClause.withKeyword, []);
+          } else if (implementsClause != null) {
+            reportError4(ParserErrorCode.IMPLEMENTS_BEFORE_EXTENDS, implementsClause.keyword, []);
+          }
+        } else {
+          reportError4(ParserErrorCode.MULTIPLE_EXTENDS_CLAUSES, extendsClause.keyword, []);
+          parseExtendsClause();
+        }
+      } else if (matches(Keyword.WITH)) {
+        if (withClause == null) {
+          withClause = parseWithClause();
+          if (implementsClause != null) {
+            reportError4(ParserErrorCode.IMPLEMENTS_BEFORE_WITH, implementsClause.keyword, []);
+          }
+        } else {
+          reportError4(ParserErrorCode.MULTIPLE_WITH_CLAUSES, withClause.withKeyword, []);
+          parseWithClause();
+        }
+      } else if (matches(Keyword.IMPLEMENTS)) {
+        if (implementsClause == null) {
+          implementsClause = parseImplementsClause();
+        } else {
+          reportError4(ParserErrorCode.MULTIPLE_IMPLEMENTS_CLAUSES, implementsClause.keyword, []);
+          parseImplementsClause();
+        }
+      } else {
+        foundClause = false;
+      }
+    }
+    if (withClause != null && extendsClause == null) {
+      reportError4(ParserErrorCode.WITH_WITHOUT_EXTENDS, withClause.withKeyword, []);
+    }
+    Token leftBracket = null;
+    List<ClassMember> members = null;
+    Token rightBracket = null;
+    if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+      leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
+      members = parseClassMembers(className);
+      rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
+    } else {
+      leftBracket = createSyntheticToken(TokenType.OPEN_CURLY_BRACKET);
+      rightBracket = createSyntheticToken(TokenType.CLOSE_CURLY_BRACKET);
+      reportError3(ParserErrorCode.MISSING_CLASS_BODY, []);
+    }
+    return new ClassDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, abstractKeyword, keyword, name, typeParameters, extendsClause, withClause, implementsClause, leftBracket, members, rightBracket);
+  }
+  /**
+   * Parse a class member.
+   * <pre>
+   * classMemberDefinition ::=
+   * declaration ';'
+   * | methodSignature functionBody
+   * </pre>
+   * @param className the name of the class containing the member being parsed
+   * @return the class member that was parsed
+   */
+  ClassMember parseClassMember(String className) {
+    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
+    Modifiers modifiers = parseModifiers();
+    if (matches(Keyword.VOID)) {
+      TypeName returnType = parseReturnType();
+      if (matches(Keyword.GET) && matchesIdentifier2(peek())) {
+        validateModifiersForGetterOrSetterOrMethod(modifiers);
+        return parseGetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, returnType);
+      } else if (matches(Keyword.SET) && matchesIdentifier2(peek())) {
+        validateModifiersForGetterOrSetterOrMethod(modifiers);
+        return parseSetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, returnType);
+      } else if (matches(Keyword.OPERATOR) && peek().isOperator()) {
+        validateModifiersForOperator(modifiers);
+        return parseOperator(commentAndMetadata, modifiers.externalKeyword, returnType);
+      } else if (matchesIdentifier() && matchesAny(peek(), [TokenType.OPEN_PAREN, TokenType.OPEN_CURLY_BRACKET, TokenType.FUNCTION])) {
+        validateModifiersForGetterOrSetterOrMethod(modifiers);
+        return parseMethodDeclaration(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, returnType);
+      } else {
+        if (matchesIdentifier()) {
+          if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
+            reportError(ParserErrorCode.VOID_VARIABLE, returnType, []);
+            return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), returnType);
+          }
+        }
+        return null;
+      }
+    } else if (matches(Keyword.GET) && matchesIdentifier2(peek())) {
+      validateModifiersForGetterOrSetterOrMethod(modifiers);
+      return parseGetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, null);
+    } else if (matches(Keyword.SET) && matchesIdentifier2(peek())) {
+      validateModifiersForGetterOrSetterOrMethod(modifiers);
+      return parseSetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, null);
+    } else if (matches(Keyword.OPERATOR) && peek().isOperator()) {
+      validateModifiersForOperator(modifiers);
+      return parseOperator(commentAndMetadata, modifiers.externalKeyword, null);
+    } else if (!matchesIdentifier()) {
+      return null;
+    } else if (matches4(peek(), TokenType.PERIOD) && matchesIdentifier2(peek2(2)) && matches4(peek2(3), TokenType.OPEN_PAREN)) {
+      return parseConstructor(commentAndMetadata, modifiers.externalKeyword, validateModifiersForConstructor(modifiers), modifiers.factoryKeyword, parseSimpleIdentifier(), andAdvance, parseSimpleIdentifier(), parseFormalParameterList());
+    } else if (matches4(peek(), TokenType.OPEN_PAREN)) {
+      SimpleIdentifier methodName = parseSimpleIdentifier();
+      FormalParameterList parameters = parseFormalParameterList();
+      if (matches5(TokenType.COLON) || modifiers.factoryKeyword != null || methodName.name == className) {
+        return parseConstructor(commentAndMetadata, modifiers.externalKeyword, validateModifiersForConstructor(modifiers), modifiers.factoryKeyword, methodName, null, null, parameters);
+      }
+      validateModifiersForGetterOrSetterOrMethod(modifiers);
+      validateFormalParameterList(parameters);
+      return parseMethodDeclaration2(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, null, methodName, parameters);
+    } else if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
+      return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), null);
+    }
+    TypeName type = parseTypeName();
+    if (matches(Keyword.GET) && matchesIdentifier2(peek())) {
+      validateModifiersForGetterOrSetterOrMethod(modifiers);
+      return parseGetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, type);
+    } else if (matches(Keyword.SET) && matchesIdentifier2(peek())) {
+      validateModifiersForGetterOrSetterOrMethod(modifiers);
+      return parseSetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, type);
+    } else if (matches(Keyword.OPERATOR) && peek().isOperator()) {
+      validateModifiersForOperator(modifiers);
+      return parseOperator(commentAndMetadata, modifiers.externalKeyword, type);
+    } else if (!matchesIdentifier()) {
+    } else if (matches4(peek(), TokenType.OPEN_PAREN)) {
+      validateModifiersForGetterOrSetterOrMethod(modifiers);
+      return parseMethodDeclaration(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, type);
+    }
+    return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), type);
+  }
+  /**
+   * Parse a list of class members.
+   * <pre>
+   * classMembers ::=
+   * (metadata memberDefinition)
+   * </pre>
+   * @return the list of class members that were parsed
+   */
+  List<ClassMember> parseClassMembers(String className) {
+    List<ClassMember> members = new List<ClassMember>();
+    Token memberStart = _currentToken;
+    while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET) && !matches(Keyword.CLASS) && !matches(Keyword.TYPEDEF)) {
+      if (matches5(TokenType.SEMICOLON)) {
+        reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+        advance();
+      } else {
+        ClassMember member = parseClassMember(className);
+        if (member != null) {
+          members.add(member);
+        }
+      }
+      if (_currentToken == memberStart) {
+        reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+        advance();
+      }
+      memberStart = _currentToken;
+    }
+    return members;
+  }
+  /**
+   * Parse a class type alias.
+   * <pre>
+   * classTypeAlias ::=
+   * identifier typeParameters? '=' 'abstract'? mixinApplication
+   * mixinApplication ::=
+   * type withClause implementsClause? ';'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the member
+   * @param keyword the token representing the 'typedef' keyword
+   * @return the class type alias that was parsed
+   */
+  ClassTypeAlias parseClassTypeAlias(CommentAndMetadata commentAndMetadata, Token keyword) {
+    SimpleIdentifier name = parseSimpleIdentifier();
+    TypeParameterList typeParameters = null;
+    if (matches5(TokenType.LT)) {
+      typeParameters = parseTypeParameterList();
+    }
+    Token equals = expect2(TokenType.EQ);
+    Token abstractKeyword = null;
+    if (matches(Keyword.ABSTRACT)) {
+      abstractKeyword = andAdvance;
+    }
+    TypeName superclass = parseTypeName();
+    WithClause withClause = parseWithClause();
+    ImplementsClause implementsClause = null;
+    if (matches(Keyword.IMPLEMENTS)) {
+      implementsClause = parseImplementsClause();
+    }
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new ClassTypeAlias(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, name, typeParameters, equals, abstractKeyword, superclass, withClause, implementsClause, semicolon);
+  }
+  /**
+   * Parse a list of combinators in a directive.
+   * <pre>
+   * combinator ::=
+   * 'show' identifier (',' identifier)
+   * | 'hide' identifier (',' identifier)
+   * </pre>
+   * @return the combinators that were parsed
+   */
+  List<Combinator> parseCombinators() {
+    List<Combinator> combinators = new List<Combinator>();
+    while (matches2(Parser._SHOW) || matches2(Parser._HIDE)) {
+      Token keyword = expect2(TokenType.IDENTIFIER);
+      if (keyword.lexeme == Parser._SHOW) {
+        List<SimpleIdentifier> shownNames = parseIdentifierList();
+        combinators.add(new ShowCombinator(keyword, shownNames));
+      } else {
+        List<SimpleIdentifier> hiddenNames = parseIdentifierList();
+        combinators.add(new HideCombinator(keyword, hiddenNames));
+      }
+    }
+    return combinators;
+  }
+  /**
+   * Parse the documentation comment and metadata preceeding a declaration. This method allows any
+   * number of documentation comments to occur before, after or between the metadata, but only
+   * returns the last (right-most) documentation comment that is found.
+   * <pre>
+   * metadata ::=
+   * annotation
+   * </pre>
+   * @return the documentation comment and metadata that were parsed
+   */
+  CommentAndMetadata parseCommentAndMetadata() {
+    Comment comment = parseDocumentationComment();
+    List<Annotation> metadata = new List<Annotation>();
+    while (matches5(TokenType.AT)) {
+      metadata.add(parseAnnotation());
+      Comment optionalComment = parseDocumentationComment();
+      if (optionalComment != null) {
+        comment = optionalComment;
+      }
+    }
+    return new CommentAndMetadata(comment, metadata);
+  }
+  /**
+   * Parse a comment reference from the source between square brackets.
+   * <pre>
+   * commentReference ::=
+   * 'new'? prefixedIdentifier
+   * </pre>
+   * @param referenceSource the source occurring between the square brackets within a documentation
+   * comment
+   * @param sourceOffset the offset of the first character of the reference source
+   * @return the comment reference that was parsed
+   */
+  CommentReference parseCommentReference(String referenceSource, int sourceOffset) {
+    if (referenceSource.length == 0) {
+      return null;
+    }
+    try {
+      List<bool> errorFound = [false];
+      AnalysisErrorListener listener = new AnalysisErrorListener_1(errorFound);
+      StringScanner scanner = new StringScanner(null, referenceSource, listener);
+      scanner.setSourceStart(1, 1, sourceOffset);
+      Token firstToken = scanner.tokenize();
+      if (!errorFound[0]) {
+        Token newKeyword = null;
+        if (matches3(firstToken, Keyword.NEW)) {
+          newKeyword = firstToken;
+          firstToken = firstToken.next;
+        }
+        if (matchesIdentifier2(firstToken)) {
+          Token secondToken = firstToken.next;
+          Token thirdToken = secondToken.next;
+          Token nextToken;
+          Identifier identifier;
+          if (matches4(secondToken, TokenType.PERIOD) && matchesIdentifier2(thirdToken)) {
+            identifier = new PrefixedIdentifier(new SimpleIdentifier(firstToken), secondToken, new SimpleIdentifier(thirdToken));
+            nextToken = thirdToken.next;
+          } else {
+            identifier = new SimpleIdentifier(firstToken);
+            nextToken = firstToken.next;
+          }
+          if (nextToken.type != TokenType.EOF) {
+          }
+          return new CommentReference(newKeyword, identifier);
+        } else if (matches3(firstToken, Keyword.THIS) || matches3(firstToken, Keyword.NULL) || matches3(firstToken, Keyword.TRUE) || matches3(firstToken, Keyword.FALSE)) {
+          return null;
+        } else if (matches4(firstToken, TokenType.STRING)) {
+        } else {
+        }
+      }
+    } on Exception catch (exception) {
+    }
+    return null;
+  }
+  /**
+   * Parse all of the comment references occurring in the given array of documentation comments.
+   * <pre>
+   * commentReference ::=
+   * '[' 'new'? qualified ']' libraryReference?
+   * libraryReference ::=
+   * '(' stringLiteral ')'
+   * </pre>
+   * @param tokens the comment tokens representing the documentation comments to be parsed
+   * @return the comment references that were parsed
+   */
+  List<CommentReference> parseCommentReferences(List<Token> tokens) {
+    List<CommentReference> references = new List<CommentReference>();
+    for (Token token in tokens) {
+      String comment = token.lexeme;
+      int leftIndex = comment.indexOf('[');
+      while (leftIndex >= 0) {
+        int rightIndex = comment.indexOf(']', leftIndex);
+        if (rightIndex >= 0) {
+          int firstChar = comment.charCodeAt(leftIndex + 1);
+          if (firstChar != 0x27 && firstChar != 0x22 && firstChar != 0x3a) {
+            CommentReference reference = parseCommentReference(comment.substring(leftIndex + 1, rightIndex), token.offset + leftIndex + 1);
+            if (reference != null) {
+              references.add(reference);
+            }
+          }
+        } else {
+          rightIndex = leftIndex + 1;
+        }
+        leftIndex = comment.indexOf('[', rightIndex);
+      }
+    }
+    return references;
+  }
+  /**
+   * Parse a compilation unit.
+   * <p>
+   * Specified:
+   * <pre>
+   * compilationUnit ::=
+   * scriptTag? directive* topLevelDeclaration
+   * </pre>
+   * Actual:
+   * <pre>
+   * compilationUnit ::=
+   * scriptTag? topLevelElement
+   * topLevelElement ::=
+   * directive
+   * | topLevelDeclaration
+   * </pre>
+   * @return the compilation unit that was parsed
+   */
+  CompilationUnit parseCompilationUnit2() {
+    Token firstToken = _currentToken.precedingComments;
+    if (firstToken == null) {
+      firstToken = _currentToken;
+    }
+    ScriptTag scriptTag = null;
+    if (matches5(TokenType.SCRIPT_TAG)) {
+      scriptTag = new ScriptTag(andAdvance);
+    }
+    bool libraryDirectiveFound = false;
+    bool partOfDirectiveFound = false;
+    bool partDirectiveFound = false;
+    bool directiveFoundAfterDeclaration = false;
+    List<Directive> directives = new List<Directive>();
+    List<CompilationUnitMember> declarations = new List<CompilationUnitMember>();
+    Token memberStart = _currentToken;
+    while (!matches5(TokenType.EOF)) {
+      CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
+      if (matches(Keyword.IMPORT) || matches(Keyword.EXPORT) || matches(Keyword.LIBRARY) || matches(Keyword.PART)) {
+        Directive directive = parseDirective(commentAndMetadata);
+        if (declarations.length > 0 && !directiveFoundAfterDeclaration) {
+          reportError3(ParserErrorCode.DIRECTIVE_AFTER_DECLARATION, []);
+          directiveFoundAfterDeclaration = true;
+        }
+        if (directive is LibraryDirective) {
+          if (libraryDirectiveFound) {
+            reportError3(ParserErrorCode.MULTIPLE_LIBRARY_DIRECTIVES, []);
+          } else {
+            if (directives.length > 0) {
+              reportError3(ParserErrorCode.LIBRARY_DIRECTIVE_NOT_FIRST, []);
+            }
+            libraryDirectiveFound = true;
+          }
+        } else if (directive is PartDirective) {
+          partDirectiveFound = true;
+        } else if (partDirectiveFound) {
+          if (directive is ExportDirective) {
+            reportError3(ParserErrorCode.EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE, []);
+          } else if (directive is ImportDirective) {
+            reportError3(ParserErrorCode.IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE, []);
+          }
+        }
+        if (directive is PartOfDirective) {
+          if (partOfDirectiveFound) {
+            reportError3(ParserErrorCode.MULTIPLE_PART_OF_DIRECTIVES, []);
+          } else {
+            for (Directive preceedingDirective in directives) {
+              reportError4(ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART, preceedingDirective.keyword, []);
+            }
+            partOfDirectiveFound = true;
+          }
+        } else {
+          if (partOfDirectiveFound) {
+            reportError4(ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART, directive.keyword, []);
+          }
+        }
+        directives.add(directive);
+      } else if (matches5(TokenType.SEMICOLON)) {
+        reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+        advance();
+      } else {
+        CompilationUnitMember member = parseCompilationUnitMember(commentAndMetadata);
+        if (member != null) {
+          declarations.add(member);
+        }
+      }
+      if (_currentToken == memberStart) {
+        reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+        advance();
+      }
+      memberStart = _currentToken;
+    }
+    return new CompilationUnit(firstToken, scriptTag, directives, declarations, _currentToken);
+  }
+  /**
+   * Parse a compilation unit member.
+   * <pre>
+   * compilationUnitMember ::=
+   * classDefinition
+   * | functionTypeAlias
+   * | external functionSignature
+   * | external getterSignature
+   * | external setterSignature
+   * | functionSignature functionBody
+   * | returnType? getOrSet identifier formalParameterList functionBody
+   * | (final | const) type? staticFinalDeclarationList ';'
+   * | variableDeclaration ';'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the member
+   * @return the compilation unit member that was parsed
+   */
+  CompilationUnitMember parseCompilationUnitMember(CommentAndMetadata commentAndMetadata) {
+    Modifiers modifiers = parseModifiers();
+    if (matches(Keyword.CLASS)) {
+      return parseClassDeclaration(commentAndMetadata, validateModifiersForClass(modifiers));
+    } else if (matches(Keyword.TYPEDEF)) {
+      validateModifiersForTypedef(modifiers);
+      return parseTypeAlias(commentAndMetadata);
+    }
+    if (matches(Keyword.VOID)) {
+      TypeName returnType = parseReturnType();
+      if ((matches(Keyword.GET) || matches(Keyword.SET)) && matchesIdentifier2(peek())) {
+        validateModifiersForTopLevelFunction(modifiers);
+        return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null, false);
+      } else if (matches(Keyword.OPERATOR) && peek().isOperator()) {
+        return null;
+      } else if (matchesIdentifier() && matchesAny(peek(), [TokenType.OPEN_PAREN, TokenType.OPEN_CURLY_BRACKET, TokenType.FUNCTION])) {
+        validateModifiersForTopLevelFunction(modifiers);
+        return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null, false);
+      } else {
+        if (matchesIdentifier()) {
+          if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
+            reportError(ParserErrorCode.VOID_VARIABLE, returnType, []);
+            return new TopLevelVariableDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(validateModifiersForTopLevelVariable(modifiers), null), expect2(TokenType.SEMICOLON));
+          }
+        }
+        return null;
+      }
+    } else if ((matches(Keyword.GET) || matches(Keyword.SET)) && matchesIdentifier2(peek())) {
+      validateModifiersForTopLevelFunction(modifiers);
+      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null, false);
+    } else if (matches(Keyword.OPERATOR) && peek().isOperator()) {
+      return null;
+    } else if (!matchesIdentifier()) {
+      return null;
+    } else if (matches4(peek(), TokenType.OPEN_PAREN)) {
+      validateModifiersForTopLevelFunction(modifiers);
+      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null, false);
+    } else if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
+      return new TopLevelVariableDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(validateModifiersForTopLevelVariable(modifiers), null), expect2(TokenType.SEMICOLON));
+    }
+    TypeName returnType = parseReturnType();
+    if (matches(Keyword.GET) || matches(Keyword.SET)) {
+      validateModifiersForTopLevelFunction(modifiers);
+      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, returnType, false);
+    } else if (!matchesIdentifier()) {
+      return null;
+    }
+    if (matchesAny(peek(), [TokenType.OPEN_PAREN, TokenType.FUNCTION, TokenType.OPEN_CURLY_BRACKET])) {
+      validateModifiersForTopLevelFunction(modifiers);
+      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, returnType, false);
+    }
+    return new TopLevelVariableDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(validateModifiersForTopLevelVariable(modifiers), returnType), expect2(TokenType.SEMICOLON));
+  }
+  /**
+   * Parse a conditional expression.
+   * <pre>
+   * conditionalExpression ::=
+   * logicalOrExpression ('?' expressionWithoutCascade ':' expressionWithoutCascade)?
+   * </pre>
+   * @return the conditional expression that was parsed
+   */
+  Expression parseConditionalExpression() {
+    Expression condition = parseLogicalOrExpression();
+    if (!matches5(TokenType.QUESTION)) {
+      return condition;
+    }
+    Token question = andAdvance;
+    Expression thenExpression = parseExpressionWithoutCascade();
+    Token colon = expect2(TokenType.COLON);
+    Expression elseExpression = parseExpressionWithoutCascade();
+    return new ConditionalExpression(condition, question, thenExpression, colon, elseExpression);
+  }
+  /**
+   * Parse a const expression.
+   * <pre>
+   * constExpression ::=
+   * instanceCreationExpression
+   * | listLiteral
+   * | mapLiteral
+   * </pre>
+   * @return the const expression that was parsed
+   */
+  Expression parseConstExpression() {
+    Token keyword = expect(Keyword.CONST);
+    if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.INDEX)) {
+      return parseListLiteral(keyword, null);
+    } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+      return parseMapLiteral(keyword, null);
+    } else if (matches5(TokenType.LT)) {
+      return parseListOrMapLiteral(keyword);
+    }
+    return parseInstanceCreationExpression(keyword);
+  }
+  ConstructorDeclaration parseConstructor(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token constKeyword, Token factoryKeyword, SimpleIdentifier returnType, Token period, SimpleIdentifier name, FormalParameterList parameters) {
+    bool bodyAllowed = externalKeyword == null;
+    Token separator = null;
+    List<ConstructorInitializer> initializers = null;
+    if (matches5(TokenType.COLON)) {
+      separator = andAdvance;
+      initializers = new List<ConstructorInitializer>();
+      do {
+        if (matches(Keyword.THIS)) {
+          if (matches4(peek(), TokenType.OPEN_PAREN)) {
+            bodyAllowed = false;
+            initializers.add(parseRedirectingConstructorInvocation());
+          } else if (matches4(peek(), TokenType.PERIOD) && matches4(peek2(3), TokenType.OPEN_PAREN)) {
+            bodyAllowed = false;
+            initializers.add(parseRedirectingConstructorInvocation());
+          } else {
+            initializers.add(parseConstructorFieldInitializer());
+          }
+        } else if (matches(Keyword.SUPER)) {
+          initializers.add(parseSuperConstructorInvocation());
+        } else {
+          initializers.add(parseConstructorFieldInitializer());
+        }
+      } while (optional(TokenType.COMMA));
+    }
+    ConstructorName redirectedConstructor = null;
+    FunctionBody body;
+    if (matches5(TokenType.EQ)) {
+      separator = andAdvance;
+      redirectedConstructor = parseConstructorName();
+      body = new EmptyFunctionBody(expect2(TokenType.SEMICOLON));
+    } else {
+      body = parseFunctionBody(true, false);
+      if (!bodyAllowed && body is! EmptyFunctionBody) {
+        reportError3(ParserErrorCode.EXTERNAL_CONSTRUCTOR_WITH_BODY, []);
+      }
+    }
+    return new ConstructorDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, constKeyword, factoryKeyword, returnType, period, name, parameters, separator, initializers, redirectedConstructor, body);
+  }
+  /**
+   * Parse a field initializer within a constructor.
+   * <pre>
+   * fieldInitializer:
+   * ('this' '.')? identifier '=' conditionalExpression cascadeSection
+   * </pre>
+   * @return the field initializer that was parsed
+   */
+  ConstructorFieldInitializer parseConstructorFieldInitializer() {
+    Token keyword = null;
+    Token period = null;
+    if (matches(Keyword.THIS)) {
+      keyword = andAdvance;
+      period = expect2(TokenType.PERIOD);
+    }
+    SimpleIdentifier fieldName = parseSimpleIdentifier();
+    Token equals = expect2(TokenType.EQ);
+    Expression expression = parseConditionalExpression();
+    TokenType tokenType = _currentToken.type;
+    if (tokenType == TokenType.PERIOD_PERIOD) {
+      List<Expression> cascadeSections = new List<Expression>();
+      while (tokenType == TokenType.PERIOD_PERIOD) {
+        Expression section = parseCascadeSection();
+        if (section != null) {
+          cascadeSections.add(section);
+        }
+        tokenType = _currentToken.type;
+      }
+      expression = new CascadeExpression(expression, cascadeSections);
+    }
+    return new ConstructorFieldInitializer(keyword, period, fieldName, equals, expression);
+  }
+  /**
+   * Parse the name of a constructor.
+   * <pre>
+   * constructorName:
+   * type ('.' identifier)?
+   * </pre>
+   * @return the constructor name that was parsed
+   */
+  ConstructorName parseConstructorName() {
+    TypeName type = parseTypeName();
+    Token period = null;
+    SimpleIdentifier name = null;
+    if (matches5(TokenType.PERIOD)) {
+      period = andAdvance;
+      name = parseSimpleIdentifier();
+    }
+    return new ConstructorName(type, period, name);
+  }
+  /**
+   * Parse a continue statement.
+   * <pre>
+   * continueStatement ::=
+   * 'continue' identifier? ';'
+   * </pre>
+   * @return the continue statement that was parsed
+   */
+  Statement parseContinueStatement() {
+    Token continueKeyword = expect(Keyword.CONTINUE);
+    if (!_inLoop && !_inSwitch) {
+      reportError4(ParserErrorCode.CONTINUE_OUTSIDE_OF_LOOP, continueKeyword, []);
+    }
+    SimpleIdentifier label = null;
+    if (matchesIdentifier()) {
+      label = parseSimpleIdentifier();
+    }
+    if (_inSwitch && !_inLoop && label == null) {
+      reportError4(ParserErrorCode.CONTINUE_WITHOUT_LABEL_IN_CASE, continueKeyword, []);
+    }
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new ContinueStatement(continueKeyword, label, semicolon);
+  }
+  /**
+   * Parse a directive.
+   * <pre>
+   * directive ::=
+   * exportDirective
+   * | libraryDirective
+   * | importDirective
+   * | partDirective
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the directive
+   * @return the directive that was parsed
+   */
+  Directive parseDirective(CommentAndMetadata commentAndMetadata) {
+    if (matches(Keyword.IMPORT)) {
+      return parseImportDirective(commentAndMetadata);
+    } else if (matches(Keyword.EXPORT)) {
+      return parseExportDirective(commentAndMetadata);
+    } else if (matches(Keyword.LIBRARY)) {
+      return parseLibraryDirective(commentAndMetadata);
+    } else if (matches(Keyword.PART)) {
+      return parsePartDirective(commentAndMetadata);
+    } else {
+      return null;
+    }
+  }
+  /**
+   * Parse a documentation comment.
+   * <pre>
+   * documentationComment ::=
+   * multiLineComment?
+   * | singleLineComment
+   * </pre>
+   * @return the documentation comment that was parsed, or {@code null} if there was no comment
+   */
+  Comment parseDocumentationComment() {
+    List<Token> commentTokens = new List<Token>();
+    Token commentToken = _currentToken.precedingComments;
+    while (commentToken != null) {
+      if (commentToken.type == TokenType.SINGLE_LINE_COMMENT) {
+        if (commentToken.lexeme.startsWith("///")) {
+          if (commentTokens.length == 1 && commentTokens[0].lexeme.startsWith("/**")) {
+            commentTokens.clear();
+          }
+          commentTokens.add(commentToken);
+        }
+      } else {
+        if (commentToken.lexeme.startsWith("/**")) {
+          commentTokens.clear();
+          commentTokens.add(commentToken);
+        }
+      }
+      commentToken = commentToken.next;
+    }
+    if (commentTokens.isEmpty) {
+      return null;
+    }
+    List<Token> tokens = new List.from(commentTokens);
+    List<CommentReference> references = parseCommentReferences(tokens);
+    return Comment.createDocumentationComment2(tokens, references);
+  }
+  /**
+   * Parse a do statement.
+   * <pre>
+   * doStatement ::=
+   * 'do' statement 'while' '(' expression ')' ';'
+   * </pre>
+   * @return the do statement that was parsed
+   */
+  Statement parseDoStatement() {
+    bool wasInLoop = _inLoop;
+    _inLoop = true;
+    try {
+      Token doKeyword = expect(Keyword.DO);
+      Statement body = parseStatement2();
+      Token whileKeyword = expect(Keyword.WHILE);
+      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+      Expression condition = parseExpression2();
+      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+      Token semicolon = expect2(TokenType.SEMICOLON);
+      return new DoStatement(doKeyword, body, whileKeyword, leftParenthesis, condition, rightParenthesis, semicolon);
+    } finally {
+      _inLoop = wasInLoop;
+    }
+  }
+  /**
+   * Parse an empty statement.
+   * <pre>
+   * emptyStatement ::=
+   * ';'
+   * </pre>
+   * @return the empty statement that was parsed
+   */
+  Statement parseEmptyStatement() => new EmptyStatement(andAdvance);
+  /**
+   * Parse an equality expression.
+   * <pre>
+   * equalityExpression ::=
+   * relationalExpression (equalityOperator relationalExpression)?
+   * | 'super' equalityOperator relationalExpression
+   * </pre>
+   * @return the equality expression that was parsed
+   */
+  Expression parseEqualityExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && _currentToken.next.type.isEqualityOperator()) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseRelationalExpression();
+    }
+    while (_currentToken.type.isEqualityOperator()) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseRelationalExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse an export directive.
+   * <pre>
+   * exportDirective ::=
+   * metadata 'export' stringLiteral combinator*';'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the directive
+   * @return the export directive that was parsed
+   */
+  ExportDirective parseExportDirective(CommentAndMetadata commentAndMetadata) {
+    Token exportKeyword = expect(Keyword.EXPORT);
+    StringLiteral libraryUri = parseStringLiteral();
+    List<Combinator> combinators = parseCombinators();
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new ExportDirective(commentAndMetadata.comment, commentAndMetadata.metadata, exportKeyword, libraryUri, combinators, semicolon);
+  }
+  /**
+   * Parse an expression that does not contain any cascades.
+   * <pre>
+   * expression ::=
+   * assignableExpression assignmentOperator expression
+   * | conditionalExpression cascadeSection
+   * | throwExpression
+   * </pre>
+   * @return the expression that was parsed
+   */
+  Expression parseExpression2() {
+    if (matches(Keyword.THROW)) {
+      return parseThrowExpression();
+    }
+    Expression expression = parseConditionalExpression();
+    TokenType tokenType = _currentToken.type;
+    if (tokenType == TokenType.PERIOD_PERIOD) {
+      List<Expression> cascadeSections = new List<Expression>();
+      while (tokenType == TokenType.PERIOD_PERIOD) {
+        Expression section = parseCascadeSection();
+        if (section != null) {
+          cascadeSections.add(section);
+        }
+        tokenType = _currentToken.type;
+      }
+      return new CascadeExpression(expression, cascadeSections);
+    } else if (tokenType.isAssignmentOperator()) {
+      Token operator = andAdvance;
+      ensureAssignable(expression);
+      return new AssignmentExpression(expression, operator, parseExpression2());
+    }
+    return expression;
+  }
+  /**
+   * Parse a list of expressions.
+   * <pre>
+   * expressionList ::=
+   * expression (',' expression)
+   * </pre>
+   * @return the expression that was parsed
+   */
+  List<Expression> parseExpressionList() {
+    List<Expression> expressions = new List<Expression>();
+    expressions.add(parseExpression2());
+    while (optional(TokenType.COMMA)) {
+      expressions.add(parseExpression2());
+    }
+    return expressions;
+  }
+  /**
+   * Parse an expression that does not contain any cascades.
+   * <pre>
+   * expressionWithoutCascade ::=
+   * assignableExpression assignmentOperator expressionWithoutCascade
+   * | conditionalExpression
+   * | throwExpressionWithoutCascade
+   * </pre>
+   * @return the expression that was parsed
+   */
+  Expression parseExpressionWithoutCascade() {
+    if (matches(Keyword.THROW)) {
+      return parseThrowExpressionWithoutCascade();
+    }
+    Expression expression = parseConditionalExpression();
+    if (_currentToken.type.isAssignmentOperator()) {
+      Token operator = andAdvance;
+      ensureAssignable(expression);
+      expression = new AssignmentExpression(expression, operator, parseExpressionWithoutCascade());
+    }
+    return expression;
+  }
+  /**
+   * Parse a class extends clause.
+   * <pre>
+   * classExtendsClause ::=
+   * 'extends' type
+   * </pre>
+   * @return the class extends clause that was parsed
+   */
+  ExtendsClause parseExtendsClause() {
+    Token keyword = expect(Keyword.EXTENDS);
+    TypeName superclass = parseTypeName();
+    return new ExtendsClause(keyword, superclass);
+  }
+  /**
+   * Parse the 'final', 'const', 'var' or type preceding a variable declaration.
+   * <pre>
+   * finalConstVarOrType ::=
+   * | 'final' type?
+   * | 'const' type?
+   * | 'var'
+   * | type
+   * </pre>
+   * @param optional {@code true} if the keyword and type are optional
+   * @return the 'final', 'const', 'var' or type that was parsed
+   */
+  FinalConstVarOrType parseFinalConstVarOrType(bool optional) {
+    Token keyword = null;
+    TypeName type = null;
+    if (matches(Keyword.FINAL) || matches(Keyword.CONST)) {
+      keyword = andAdvance;
+      if (matchesIdentifier2(peek()) || matches4(peek(), TokenType.LT) || matches3(peek(), Keyword.THIS)) {
+        type = parseTypeName();
+      }
+    } else if (matches(Keyword.VAR)) {
+      keyword = andAdvance;
+    } else {
+      if (matchesIdentifier2(peek()) || matches4(peek(), TokenType.LT) || matches3(peek(), Keyword.THIS) || (matches4(peek(), TokenType.PERIOD) && matchesIdentifier2(peek2(2)) && (matchesIdentifier2(peek2(3)) || matches4(peek2(3), TokenType.LT) || matches3(peek2(3), Keyword.THIS)))) {
+        type = parseReturnType();
+      } else if (!optional) {
+        reportError3(ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE, []);
+      }
+    }
+    return new FinalConstVarOrType(keyword, type);
+  }
+  /**
+   * Parse a formal parameter. At most one of {@code isOptional} and {@code isNamed} can be{@code true}.
+   * <pre>
+   * defaultFormalParameter ::=
+   * normalFormalParameter ('=' expression)?
+   * defaultNamedParameter ::=
+   * normalFormalParameter (':' expression)?
+   * </pre>
+   * @param kind the kind of parameter being expected based on the presence or absence of group
+   * delimiters
+   * @return the formal parameter that was parsed
+   */
+  FormalParameter parseFormalParameter(ParameterKind kind) {
+    NormalFormalParameter parameter = parseNormalFormalParameter();
+    if (matches5(TokenType.EQ)) {
+      Token seperator = andAdvance;
+      Expression defaultValue = parseExpression2();
+      if (kind == ParameterKind.NAMED) {
+        reportError4(ParserErrorCode.WRONG_SEPARATOR_FOR_NAMED_PARAMETER, seperator, []);
+      } else if (kind == ParameterKind.REQUIRED) {
+        reportError(ParserErrorCode.POSITIONAL_PARAMETER_OUTSIDE_GROUP, parameter, []);
+      }
+      return new DefaultFormalParameter(parameter, kind, seperator, defaultValue);
+    } else if (matches5(TokenType.COLON)) {
+      Token seperator = andAdvance;
+      Expression defaultValue = parseExpression2();
+      if (kind == ParameterKind.POSITIONAL) {
+        reportError4(ParserErrorCode.WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER, seperator, []);
+      } else if (kind == ParameterKind.REQUIRED) {
+        reportError(ParserErrorCode.NAMED_PARAMETER_OUTSIDE_GROUP, parameter, []);
+      }
+      return new DefaultFormalParameter(parameter, kind, seperator, defaultValue);
+    } else if (kind != ParameterKind.REQUIRED) {
+      return new DefaultFormalParameter(parameter, kind, null, null);
+    }
+    return parameter;
+  }
+  /**
+   * Parse a list of formal parameters.
+   * <pre>
+   * formalParameterList ::=
+   * '(' ')'
+   * | '(' normalFormalParameters (',' optionalFormalParameters)? ')'
+   * | '(' optionalFormalParameters ')'
+   * normalFormalParameters ::=
+   * normalFormalParameter (',' normalFormalParameter)
+   * optionalFormalParameters ::=
+   * optionalPositionalFormalParameters
+   * | namedFormalParameters
+   * optionalPositionalFormalParameters ::=
+   * '[' defaultFormalParameter (',' defaultFormalParameter)* ']'
+   * namedFormalParameters ::=
+   * '{' defaultNamedParameter (',' defaultNamedParameter)* '}'
+   * </pre>
+   * @return the formal parameters that were parsed
+   */
+  FormalParameterList parseFormalParameterList() {
+    Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+    if (matches5(TokenType.CLOSE_PAREN)) {
+      return new FormalParameterList(leftParenthesis, null, null, null, andAdvance);
+    }
+    List<FormalParameter> parameters = new List<FormalParameter>();
+    List<FormalParameter> normalParameters = new List<FormalParameter>();
+    List<FormalParameter> positionalParameters = new List<FormalParameter>();
+    List<FormalParameter> namedParameters = new List<FormalParameter>();
+    List<FormalParameter> currentParameters = normalParameters;
+    Token leftSquareBracket = null;
+    Token rightSquareBracket = null;
+    Token leftCurlyBracket = null;
+    Token rightCurlyBracket = null;
+    ParameterKind kind = ParameterKind.REQUIRED;
+    bool firstParameter = true;
+    bool reportedMuliplePositionalGroups = false;
+    bool reportedMulipleNamedGroups = false;
+    bool reportedMixedGroups = false;
+    Token initialToken = null;
+    do {
+      if (firstParameter) {
+        firstParameter = false;
+      } else if (!optional(TokenType.COMMA)) {
+        if ((leftParenthesis as BeginToken).endToken != null) {
+          reportError3(ParserErrorCode.EXPECTED_TOKEN, [TokenType.COMMA.lexeme]);
+        } else {
+          break;
+        }
+      }
+      initialToken = _currentToken;
+      if (matches5(TokenType.OPEN_SQUARE_BRACKET)) {
+        if (leftSquareBracket != null && !reportedMuliplePositionalGroups) {
+          reportError3(ParserErrorCode.MULTIPLE_POSITIONAL_PARAMETER_GROUPS, []);
+          reportedMuliplePositionalGroups = true;
+        }
+        if (leftCurlyBracket != null && !reportedMixedGroups) {
+          reportError3(ParserErrorCode.MIXED_PARAMETER_GROUPS, []);
+          reportedMixedGroups = true;
+        }
+        leftSquareBracket = andAdvance;
+        currentParameters = positionalParameters;
+        kind = ParameterKind.POSITIONAL;
+      } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+        if (leftCurlyBracket != null && !reportedMulipleNamedGroups) {
+          reportError3(ParserErrorCode.MULTIPLE_NAMED_PARAMETER_GROUPS, []);
+          reportedMulipleNamedGroups = true;
+        }
+        if (leftSquareBracket != null && !reportedMixedGroups) {
+          reportError3(ParserErrorCode.MIXED_PARAMETER_GROUPS, []);
+          reportedMixedGroups = true;
+        }
+        leftCurlyBracket = andAdvance;
+        currentParameters = namedParameters;
+        kind = ParameterKind.NAMED;
+      }
+      FormalParameter parameter = parseFormalParameter(kind);
+      parameters.add(parameter);
+      currentParameters.add(parameter);
+      if (matches5(TokenType.CLOSE_SQUARE_BRACKET)) {
+        rightSquareBracket = andAdvance;
+        currentParameters = normalParameters;
+        if (leftSquareBracket == null) {
+        }
+        kind = ParameterKind.REQUIRED;
+      } else if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
+        rightCurlyBracket = andAdvance;
+        currentParameters = normalParameters;
+        if (leftCurlyBracket == null) {
+        }
+        kind = ParameterKind.REQUIRED;
+      }
+    } while (!matches5(TokenType.CLOSE_PAREN) && initialToken != _currentToken);
+    Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+    if (leftSquareBracket != null && rightSquareBracket == null) {
+    }
+    if (leftCurlyBracket != null && rightCurlyBracket == null) {
+    }
+    if (leftSquareBracket == null) {
+      leftSquareBracket = leftCurlyBracket;
+    }
+    if (rightSquareBracket == null) {
+      rightSquareBracket = rightCurlyBracket;
+    }
+    return new FormalParameterList(leftParenthesis, parameters, leftSquareBracket, rightSquareBracket, rightParenthesis);
+  }
+  /**
+   * Parse a for statement.
+   * <pre>
+   * forStatement ::=
+   * 'for' '(' forLoopParts ')' statement
+   * forLoopParts ::=
+   * forInitializerStatement expression? ';' expressionList?
+   * | declaredIdentifier 'in' expression
+   * | identifier 'in' expression
+   * forInitializerStatement ::=
+   * variableDeclarationList ';'
+   * | expression? ';'
+   * </pre>
+   * @return the for statement that was parsed
+   */
+  Statement parseForStatement() {
+    bool wasInLoop = _inLoop;
+    _inLoop = true;
+    try {
+      Token forKeyword = expect(Keyword.FOR);
+      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+      VariableDeclarationList variableList = null;
+      Expression initialization = null;
+      if (!matches5(TokenType.SEMICOLON)) {
+        if (matchesIdentifier() && matches3(peek(), Keyword.IN)) {
+          List<VariableDeclaration> variables = new List<VariableDeclaration>();
+          SimpleIdentifier variableName = parseSimpleIdentifier();
+          variables.add(new VariableDeclaration(null, null, variableName, null, null));
+          variableList = new VariableDeclarationList(null, null, variables);
+        } else if (isInitializedVariableDeclaration()) {
+          variableList = parseVariableDeclarationList();
+        } else {
+          initialization = parseExpression2();
+        }
+        if (matches(Keyword.IN)) {
+          SimpleFormalParameter loopParameter = null;
+          if (variableList == null) {
+            reportError3(ParserErrorCode.MISSING_VARIABLE_IN_FOR_EACH, []);
+          } else {
+            NodeList<VariableDeclaration> variables5 = variableList.variables;
+            if (variables5.length > 1) {
+              reportError3(ParserErrorCode.MULTIPLE_VARIABLES_IN_FOR_EACH, [variables5.length.toString()]);
+            }
+            VariableDeclaration variable = variables5[0];
+            if (variable.initializer != null) {
+              reportError3(ParserErrorCode.INITIALIZED_VARIABLE_IN_FOR_EACH, []);
+            }
+            loopParameter = new SimpleFormalParameter(null, null, variableList.keyword, variableList.type, variable.name);
+          }
+          Token inKeyword = expect(Keyword.IN);
+          Expression iterator = parseExpression2();
+          Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+          Statement body = parseStatement2();
+          return new ForEachStatement(forKeyword, leftParenthesis, loopParameter, inKeyword, iterator, rightParenthesis, body);
+        }
+      }
+      Token leftSeparator = expect2(TokenType.SEMICOLON);
+      Expression condition = null;
+      if (!matches5(TokenType.SEMICOLON)) {
+        condition = parseExpression2();
+      }
+      Token rightSeparator = expect2(TokenType.SEMICOLON);
+      List<Expression> updaters = null;
+      if (!matches5(TokenType.CLOSE_PAREN)) {
+        updaters = parseExpressionList();
+      }
+      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+      Statement body = parseStatement2();
+      return new ForStatement(forKeyword, leftParenthesis, variableList, initialization, leftSeparator, condition, rightSeparator, updaters, rightParenthesis, body);
+    } finally {
+      _inLoop = wasInLoop;
+    }
+  }
+  /**
+   * Parse a function body.
+   * <pre>
+   * functionBody ::=
+   * '=>' expression ';'
+   * | block
+   * functionExpressionBody ::=
+   * '=>' expression
+   * | block
+   * </pre>
+   * @param mayBeEmpty {@code true} if the function body is allowed to be empty
+   * @param inExpression {@code true} if the function body is being parsed as part of an expression
+   * and therefore does not have a terminating semicolon
+   * @return the function body that was parsed
+   */
+  FunctionBody parseFunctionBody(bool mayBeEmpty, bool inExpression) {
+    bool wasInLoop = _inLoop;
+    bool wasInSwitch = _inSwitch;
+    _inLoop = false;
+    _inSwitch = false;
+    try {
+      if (matches5(TokenType.SEMICOLON)) {
+        if (!mayBeEmpty) {
+          reportError3(ParserErrorCode.MISSING_FUNCTION_BODY, []);
+        }
+        return new EmptyFunctionBody(andAdvance);
+      } else if (matches5(TokenType.FUNCTION)) {
+        Token functionDefinition = andAdvance;
+        Expression expression = parseExpression2();
+        Token semicolon = null;
+        if (!inExpression) {
+          semicolon = expect2(TokenType.SEMICOLON);
+        }
+        return new ExpressionFunctionBody(functionDefinition, expression, semicolon);
+      } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+        return new BlockFunctionBody(parseBlock());
+      } else if (matches2("native")) {
+        advance();
+        parseStringLiteral();
+        return new EmptyFunctionBody(andAdvance);
+      } else {
+        reportError3(ParserErrorCode.MISSING_FUNCTION_BODY, []);
+        return new EmptyFunctionBody(createSyntheticToken(TokenType.SEMICOLON));
+      }
+    } finally {
+      _inLoop = wasInLoop;
+      _inSwitch = wasInSwitch;
+    }
+  }
+  /**
+   * Parse a function declaration.
+   * <pre>
+   * functionDeclaration ::=
+   * functionSignature functionBody
+   * | returnType? getOrSet identifier formalParameterList functionBody
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param externalKeyword the 'external' keyword, or {@code null} if the function is not external
+   * @param returnType the return type, or {@code null} if there is no return type
+   * @param isStatement {@code true} if the function declaration is being parsed as a statement
+   * @return the function declaration that was parsed
+   */
+  FunctionDeclaration parseFunctionDeclaration(CommentAndMetadata commentAndMetadata, Token externalKeyword, TypeName returnType, bool isStatement) {
+    Token keyword = null;
+    bool isGetter = false;
+    if (matches(Keyword.GET) && !matches4(peek(), TokenType.OPEN_PAREN)) {
+      keyword = andAdvance;
+      isGetter = true;
+    } else if (matches(Keyword.SET) && !matches4(peek(), TokenType.OPEN_PAREN)) {
+      keyword = andAdvance;
+    }
+    SimpleIdentifier name = parseSimpleIdentifier();
+    FormalParameterList parameters = null;
+    if (!isGetter) {
+      if (matches5(TokenType.OPEN_PAREN)) {
+        parameters = parseFormalParameterList();
+        validateFormalParameterList(parameters);
+      } else {
+        reportError3(ParserErrorCode.MISSING_FUNCTION_PARAMETERS, []);
+      }
+    } else if (matches5(TokenType.OPEN_PAREN)) {
+      reportError3(ParserErrorCode.GETTER_WITH_PARAMETERS, []);
+      parseFormalParameterList();
+    }
+    FunctionBody body = null;
+    if (externalKeyword == null) {
+      body = parseFunctionBody(false, false);
+    }
+    if (!isStatement && matches5(TokenType.SEMICOLON)) {
+      reportError3(ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken.lexeme]);
+      advance();
+    }
+    return new FunctionDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, returnType, keyword, name, new FunctionExpression(parameters, body));
+  }
+  /**
+   * Parse a function declaration statement.
+   * <pre>
+   * functionDeclarationStatement ::=
+   * functionSignature functionBody
+   * </pre>
+   * @return the function declaration statement that was parsed
+   */
+  Statement parseFunctionDeclarationStatement() => parseFunctionDeclarationStatement2(parseCommentAndMetadata(), parseOptionalReturnType());
+  /**
+   * Parse a function declaration statement.
+   * <pre>
+   * functionDeclarationStatement ::=
+   * functionSignature functionBody
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param returnType the return type, or {@code null} if there is no return type
+   * @return the function declaration statement that was parsed
+   */
+  Statement parseFunctionDeclarationStatement2(CommentAndMetadata commentAndMetadata, TypeName returnType) => new FunctionDeclarationStatement(parseFunctionDeclaration(commentAndMetadata, null, returnType, true));
+  /**
+   * Parse a function expression.
+   * <pre>
+   * functionExpression ::=
+   * (returnType? identifier)? formalParameterList functionExpressionBody
+   * </pre>
+   * @return the function expression that was parsed
+   */
+  FunctionExpression parseFunctionExpression() {
+    FormalParameterList parameters = parseFormalParameterList();
+    validateFormalParameterList(parameters);
+    FunctionBody body = parseFunctionBody(false, true);
+    return new FunctionExpression(parameters, body);
+  }
+  /**
+   * Parse a function type alias.
+   * <pre>
+   * functionTypeAlias ::=
+   * functionPrefix typeParameterList? formalParameterList ';'
+   * functionPrefix ::=
+   * returnType? name
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the member
+   * @param keyword the token representing the 'typedef' keyword
+   * @return the function type alias that was parsed
+   */
+  FunctionTypeAlias parseFunctionTypeAlias(CommentAndMetadata commentAndMetadata, Token keyword) {
+    TypeName returnType = null;
+    if (hasReturnTypeInTypeAlias()) {
+      returnType = parseReturnType();
+    }
+    SimpleIdentifier name = parseSimpleIdentifier2(ParserErrorCode.BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME);
+    TypeParameterList typeParameters = null;
+    if (matches5(TokenType.LT)) {
+      typeParameters = parseTypeParameterList();
+    }
+    if (matches5(TokenType.SEMICOLON)) {
+      reportError3(ParserErrorCode.MISSING_TYPEDEF_PARAMETERS, []);
+      FormalParameterList parameters = new FormalParameterList(createSyntheticToken(TokenType.OPEN_PAREN), null, null, null, createSyntheticToken(TokenType.CLOSE_PAREN));
+      Token semicolon = expect2(TokenType.SEMICOLON);
+      return new FunctionTypeAlias(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, returnType, name, typeParameters, parameters, semicolon);
+    } else if (!matches5(TokenType.OPEN_PAREN)) {
+      return null;
+    }
+    FormalParameterList parameters = parseFormalParameterList();
+    validateFormalParameterList(parameters);
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new FunctionTypeAlias(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, returnType, name, typeParameters, parameters, semicolon);
+  }
+  /**
+   * Parse a getter.
+   * <pre>
+   * getter ::=
+   * getterSignature functionBody?
+   * getterSignature ::=
+   * 'external'? 'static'? returnType? 'get' identifier
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param externalKeyword the 'external' token
+   * @param staticKeyword the static keyword, or {@code null} if the getter is not static
+   * @param the return type that has already been parsed, or {@code null} if there was no return
+   * type
+   * @return the getter that was parsed
+   */
+  MethodDeclaration parseGetter(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType) {
+    Token propertyKeyword = expect(Keyword.GET);
+    SimpleIdentifier name = parseSimpleIdentifier();
+    if (matches5(TokenType.OPEN_PAREN) && matches4(peek(), TokenType.CLOSE_PAREN)) {
+      reportError3(ParserErrorCode.GETTER_WITH_PARAMETERS, []);
+      advance();
+      advance();
+    }
+    FunctionBody body = parseFunctionBody(true, false);
+    if (externalKeyword != null && body is! EmptyFunctionBody) {
+      reportError3(ParserErrorCode.EXTERNAL_GETTER_WITH_BODY, []);
+    }
+    return new MethodDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType, propertyKeyword, null, name, null, body);
+  }
+  /**
+   * Parse a list of identifiers.
+   * <pre>
+   * identifierList ::=
+   * identifier (',' identifier)
+   * </pre>
+   * @return the list of identifiers that were parsed
+   */
+  List<SimpleIdentifier> parseIdentifierList() {
+    List<SimpleIdentifier> identifiers = new List<SimpleIdentifier>();
+    identifiers.add(parseSimpleIdentifier());
+    while (matches5(TokenType.COMMA)) {
+      advance();
+      identifiers.add(parseSimpleIdentifier());
+    }
+    return identifiers;
+  }
+  /**
+   * Parse an if statement.
+   * <pre>
+   * ifStatement ::=
+   * 'if' '(' expression ')' statement ('else' statement)?
+   * </pre>
+   * @return the if statement that was parsed
+   */
+  Statement parseIfStatement() {
+    Token ifKeyword = expect(Keyword.IF);
+    Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+    Expression condition = parseExpression2();
+    Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+    Statement thenStatement = parseStatement2();
+    Token elseKeyword = null;
+    Statement elseStatement = null;
+    if (matches(Keyword.ELSE)) {
+      elseKeyword = andAdvance;
+      elseStatement = parseStatement2();
+    }
+    return new IfStatement(ifKeyword, leftParenthesis, condition, rightParenthesis, thenStatement, elseKeyword, elseStatement);
+  }
+  /**
+   * Parse an implements clause.
+   * <pre>
+   * implementsClause ::=
+   * 'implements' type (',' type)
+   * </pre>
+   * @return the implements clause that was parsed
+   */
+  ImplementsClause parseImplementsClause() {
+    Token keyword = expect(Keyword.IMPLEMENTS);
+    List<TypeName> interfaces = new List<TypeName>();
+    interfaces.add(parseTypeName());
+    while (optional(TokenType.COMMA)) {
+      interfaces.add(parseTypeName());
+    }
+    return new ImplementsClause(keyword, interfaces);
+  }
+  /**
+   * Parse an import directive.
+   * <pre>
+   * importDirective ::=
+   * metadata 'import' stringLiteral ('as' identifier)? combinator*';'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the directive
+   * @return the import directive that was parsed
+   */
+  ImportDirective parseImportDirective(CommentAndMetadata commentAndMetadata) {
+    Token importKeyword = expect(Keyword.IMPORT);
+    StringLiteral libraryUri = parseStringLiteral();
+    Token asToken = null;
+    SimpleIdentifier prefix = null;
+    if (matches(Keyword.AS)) {
+      asToken = andAdvance;
+      prefix = parseSimpleIdentifier();
+    }
+    List<Combinator> combinators = parseCombinators();
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new ImportDirective(commentAndMetadata.comment, commentAndMetadata.metadata, importKeyword, libraryUri, asToken, prefix, combinators, semicolon);
+  }
+  /**
+   * Parse a list of initialized identifiers.
+   * <pre>
+   * ?? ::=
+   * 'static'? ('var' | type) initializedIdentifierList ';'
+   * | 'final' type? initializedIdentifierList ';'
+   * initializedIdentifierList ::=
+   * initializedIdentifier (',' initializedIdentifier)
+   * initializedIdentifier ::=
+   * identifier ('=' expression)?
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param staticKeyword the static keyword, or {@code null} if the getter is not static
+   * @param keyword the token representing the 'final', 'const' or 'var' keyword, or {@code null} if
+   * there is no keyword
+   * @param type the type that has already been parsed, or {@code null} if 'var' was provided
+   * @return the getter that was parsed
+   */
+  FieldDeclaration parseInitializedIdentifierList(CommentAndMetadata commentAndMetadata, Token staticKeyword, Token keyword, TypeName type) {
+    VariableDeclarationList fieldList = parseVariableDeclarationList2(keyword, type);
+    return new FieldDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, staticKeyword, fieldList, expect2(TokenType.SEMICOLON));
+  }
+  /**
+   * Parse an instance creation expression.
+   * <pre>
+   * instanceCreationExpression ::=
+   * ('new' | 'const') type ('.' identifier)? argumentList
+   * </pre>
+   * @param keyword the 'new' or 'const' keyword that introduces the expression
+   * @return the instance creation expression that was parsed
+   */
+  InstanceCreationExpression parseInstanceCreationExpression(Token keyword) {
+    ConstructorName constructorName = parseConstructorName();
+    ArgumentList argumentList = parseArgumentList();
+    return new InstanceCreationExpression(keyword, constructorName, argumentList);
+  }
+  /**
+   * Parse a library directive.
+   * <pre>
+   * libraryDirective ::=
+   * metadata 'library' identifier ';'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the directive
+   * @return the library directive that was parsed
+   */
+  LibraryDirective parseLibraryDirective(CommentAndMetadata commentAndMetadata) {
+    Token keyword = expect(Keyword.LIBRARY);
+    LibraryIdentifier libraryName = parseLibraryName(ParserErrorCode.MISSING_NAME_IN_LIBRARY_DIRECTIVE, keyword);
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new LibraryDirective(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, libraryName, semicolon);
+  }
+  /**
+   * Parse a library identifier.
+   * <pre>
+   * libraryIdentifier ::=
+   * identifier ('.' identifier)
+   * </pre>
+   * @return the library identifier that was parsed
+   */
+  LibraryIdentifier parseLibraryIdentifier() {
+    List<SimpleIdentifier> components = new List<SimpleIdentifier>();
+    components.add(parseSimpleIdentifier());
+    while (matches5(TokenType.PERIOD)) {
+      advance();
+      components.add(parseSimpleIdentifier());
+    }
+    return new LibraryIdentifier(components);
+  }
+  /**
+   * Parse a library name.
+   * <pre>
+   * libraryName ::=
+   * libraryIdentifier
+   * </pre>
+   * @param missingNameError the error code to be used if the library name is missing
+   * @param missingNameToken the token associated with the error produced if the library name is
+   * missing
+   * @return the library name that was parsed
+   */
+  LibraryIdentifier parseLibraryName(ParserErrorCode missingNameError, Token missingNameToken) {
+    if (matchesIdentifier()) {
+      return parseLibraryIdentifier();
+    } else if (matches5(TokenType.STRING)) {
+      StringLiteral string = parseStringLiteral();
+      reportError(ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME, string, []);
+    } else {
+      reportError4(missingNameError, missingNameToken, []);
+    }
+    List<SimpleIdentifier> components = new List<SimpleIdentifier>();
+    components.add(createSyntheticIdentifier());
+    return new LibraryIdentifier(components);
+  }
+  /**
+   * Parse a list literal.
+   * <pre>
+   * listLiteral ::=
+   * 'const'? typeArguments? '[' (expressionList ','?)? ']'
+   * </pre>
+   * @param modifier the 'const' modifier appearing before the literal, or {@code null} if there is
+   * no modifier
+   * @param typeArguments the type arguments appearing before the literal, or {@code null} if there
+   * are no type arguments
+   * @return the list literal that was parsed
+   */
+  ListLiteral parseListLiteral(Token modifier, TypeArgumentList typeArguments) {
+    if (matches5(TokenType.INDEX)) {
+      BeginToken leftBracket = new BeginToken(TokenType.OPEN_SQUARE_BRACKET, _currentToken.offset);
+      Token rightBracket = new Token(TokenType.CLOSE_SQUARE_BRACKET, _currentToken.offset + 1);
+      leftBracket.endToken2 = rightBracket;
+      rightBracket.setNext(_currentToken.next);
+      leftBracket.setNext(rightBracket);
+      _currentToken.previous.setNext(leftBracket);
+      _currentToken = _currentToken.next;
+      return new ListLiteral(modifier, typeArguments, leftBracket, null, rightBracket);
+    }
+    Token leftBracket = expect2(TokenType.OPEN_SQUARE_BRACKET);
+    if (matches5(TokenType.CLOSE_SQUARE_BRACKET)) {
+      return new ListLiteral(modifier, typeArguments, leftBracket, null, andAdvance);
+    }
+    List<Expression> elements = new List<Expression>();
+    elements.add(parseExpression2());
+    while (optional(TokenType.COMMA)) {
+      if (matches5(TokenType.CLOSE_SQUARE_BRACKET)) {
+        return new ListLiteral(modifier, typeArguments, leftBracket, elements, andAdvance);
+      }
+      elements.add(parseExpression2());
+    }
+    Token rightBracket = expect2(TokenType.CLOSE_SQUARE_BRACKET);
+    return new ListLiteral(modifier, typeArguments, leftBracket, elements, rightBracket);
+  }
+  /**
+   * Parse a list or map literal.
+   * <pre>
+   * listOrMapLiteral ::=
+   * listLiteral
+   * | mapLiteral
+   * </pre>
+   * @param modifier the 'const' modifier appearing before the literal, or {@code null} if there is
+   * no modifier
+   * @return the list or map literal that was parsed
+   */
+  TypedLiteral parseListOrMapLiteral(Token modifier) {
+    TypeArgumentList typeArguments = null;
+    if (matches5(TokenType.LT)) {
+      typeArguments = parseTypeArgumentList();
+    }
+    if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+      return parseMapLiteral(modifier, typeArguments);
+    } else if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.INDEX)) {
+      return parseListLiteral(modifier, typeArguments);
+    }
+    reportError3(ParserErrorCode.EXPECTED_LIST_OR_MAP_LITERAL, []);
+    return new ListLiteral(modifier, typeArguments, createSyntheticToken(TokenType.OPEN_SQUARE_BRACKET), null, createSyntheticToken(TokenType.CLOSE_SQUARE_BRACKET));
+  }
+  /**
+   * Parse a logical and expression.
+   * <pre>
+   * logicalAndExpression ::=
+   * bitwiseOrExpression ('&&' bitwiseOrExpression)
+   * </pre>
+   * @return the logical and expression that was parsed
+   */
+  Expression parseLogicalAndExpression() {
+    Expression expression = parseBitwiseOrExpression();
+    while (matches5(TokenType.AMPERSAND_AMPERSAND)) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseBitwiseOrExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a logical or expression.
+   * <pre>
+   * logicalOrExpression ::=
+   * logicalAndExpression ('||' logicalAndExpression)
+   * </pre>
+   * @return the logical or expression that was parsed
+   */
+  Expression parseLogicalOrExpression() {
+    Expression expression = parseLogicalAndExpression();
+    while (matches5(TokenType.BAR_BAR)) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseLogicalAndExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a map literal.
+   * <pre>
+   * mapLiteral ::=
+   * 'const'? typeArguments? '{' (mapLiteralEntry (',' mapLiteralEntry)* ','?)? '}'
+   * </pre>
+   * @param modifier the 'const' modifier appearing before the literal, or {@code null} if there is
+   * no modifier
+   * @param typeArguments the type arguments that were declared, or {@code null} if there are no
+   * type arguments
+   * @return the map literal that was parsed
+   */
+  MapLiteral parseMapLiteral(Token modifier, TypeArgumentList typeArguments) {
+    Token leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
+    List<MapLiteralEntry> entries = new List<MapLiteralEntry>();
+    if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
+      return new MapLiteral(modifier, typeArguments, leftBracket, entries, andAdvance);
+    }
+    entries.add(parseMapLiteralEntry());
+    while (optional(TokenType.COMMA)) {
+      if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
+        return new MapLiteral(modifier, typeArguments, leftBracket, entries, andAdvance);
+      }
+      entries.add(parseMapLiteralEntry());
+    }
+    Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
+    return new MapLiteral(modifier, typeArguments, leftBracket, entries, rightBracket);
+  }
+  /**
+   * Parse a map literal entry.
+   * <pre>
+   * mapLiteralEntry ::=
+   * stringLiteral ':' expression
+   * </pre>
+   * @return the map literal entry that was parsed
+   */
+  MapLiteralEntry parseMapLiteralEntry() {
+    StringLiteral key = parseStringLiteral();
+    Token separator = expect2(TokenType.COLON);
+    Expression value = parseExpression2();
+    return new MapLiteralEntry(key, separator, value);
+  }
+  /**
+   * Parse a method declaration.
+   * <pre>
+   * functionDeclaration ::=
+   * 'external'? 'static'? functionSignature functionBody
+   * | 'external'? functionSignature ';'
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param externalKeyword the 'external' token
+   * @param staticKeyword the static keyword, or {@code null} if the getter is not static
+   * @param returnType the return type of the method
+   * @return the method declaration that was parsed
+   */
+  MethodDeclaration parseMethodDeclaration(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType) {
+    SimpleIdentifier methodName = parseSimpleIdentifier();
+    FormalParameterList parameters = parseFormalParameterList();
+    validateFormalParameterList(parameters);
+    return parseMethodDeclaration2(commentAndMetadata, externalKeyword, staticKeyword, returnType, methodName, parameters);
+  }
+  /**
+   * Parse a method declaration.
+   * <pre>
+   * functionDeclaration ::=
+   * ('external' 'static'?)? functionSignature functionBody
+   * | 'external'? functionSignature ';'
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param externalKeyword the 'external' token
+   * @param staticKeyword the static keyword, or {@code null} if the getter is not static
+   * @param returnType the return type of the method
+   * @param name the name of the method
+   * @param parameters the parameters to the method
+   * @return the method declaration that was parsed
+   */
+  MethodDeclaration parseMethodDeclaration2(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType, SimpleIdentifier name, FormalParameterList parameters) {
+    FunctionBody body = parseFunctionBody(externalKeyword != null || staticKeyword == null, false);
+    if (externalKeyword != null) {
+      if (body is! EmptyFunctionBody) {
+        reportError(ParserErrorCode.EXTERNAL_METHOD_WITH_BODY, body, []);
+      }
+    } else if (staticKeyword != null) {
+      if (body is EmptyFunctionBody) {
+        reportError(ParserErrorCode.ABSTRACT_STATIC_METHOD, body, []);
+      }
+    }
+    return new MethodDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType, null, null, name, parameters, body);
+  }
+  /**
+   * Parse the modifiers preceding a declaration. This method allows the modifiers to appear in any
+   * order but does generate errors for duplicated modifiers. Checks for other problems, such as
+   * having the modifiers appear in the wrong order or specifying both 'const' and 'final', are
+   * reported in one of the methods whose name is prefixed with {@code validateModifiersFor}.
+   * <pre>
+   * modifiers ::=
+   * ('abstract' | 'const' | 'external' | 'factory' | 'final' | 'static' | 'var')
+   * </pre>
+   * @return the modifiers that were parsed
+   */
+  Modifiers parseModifiers() {
+    Modifiers modifiers = new Modifiers();
+    bool progress = true;
+    while (progress) {
+      if (matches(Keyword.ABSTRACT)) {
+        if (modifiers.abstractKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.abstractKeyword4 = andAdvance;
+        }
+      } else if (matches(Keyword.CONST)) {
+        if (modifiers.constKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.constKeyword3 = andAdvance;
+        }
+      } else if (matches(Keyword.EXTERNAL)) {
+        if (modifiers.externalKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.externalKeyword5 = andAdvance;
+        }
+      } else if (matches(Keyword.FACTORY)) {
+        if (modifiers.factoryKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.factoryKeyword3 = andAdvance;
+        }
+      } else if (matches(Keyword.FINAL)) {
+        if (modifiers.finalKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.finalKeyword2 = andAdvance;
+        }
+      } else if (matches(Keyword.STATIC)) {
+        if (modifiers.staticKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.staticKeyword2 = andAdvance;
+        }
+      } else if (matches(Keyword.VAR)) {
+        if (modifiers.varKeyword != null) {
+          reportError3(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
+          advance();
+        } else {
+          modifiers.varKeyword2 = andAdvance;
+        }
+      } else {
+        progress = false;
+      }
+    }
+    return modifiers;
+  }
+  /**
+   * Parse a multiplicative expression.
+   * <pre>
+   * multiplicativeExpression ::=
+   * unaryExpression (multiplicativeOperator unaryExpression)
+   * | 'super' (multiplicativeOperator unaryExpression)+
+   * </pre>
+   * @return the multiplicative expression that was parsed
+   */
+  Expression parseMultiplicativeExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && _currentToken.next.type.isMultiplicativeOperator()) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseUnaryExpression();
+    }
+    while (_currentToken.type.isMultiplicativeOperator()) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseUnaryExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a new expression.
+   * <pre>
+   * newExpression ::=
+   * instanceCreationExpression
+   * </pre>
+   * @return the new expression that was parsed
+   */
+  InstanceCreationExpression parseNewExpression() => parseInstanceCreationExpression(expect(Keyword.NEW));
+  /**
+   * Parse a non-labeled statement.
+   * <pre>
+   * nonLabeledStatement ::=
+   * block
+   * | assertStatement
+   * | breakStatement
+   * | continueStatement
+   * | doStatement
+   * | forStatement
+   * | ifStatement
+   * | returnStatement
+   * | switchStatement
+   * | tryStatement
+   * | whileStatement
+   * | variableDeclarationList ';'
+   * | expressionStatement
+   * | functionSignature functionBody
+   * </pre>
+   * @return the non-labeled statement that was parsed
+   */
+  Statement parseNonLabeledStatement() {
+    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
+    if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+      if (matches4(peek(), TokenType.STRING)) {
+        Token afterString = skipStringLiteral(_currentToken.next);
+        if (afterString != null && afterString.type == TokenType.COLON) {
+          return new ExpressionStatement(parseExpression2(), expect2(TokenType.SEMICOLON));
+        }
+      }
+      return parseBlock();
+    } else if (matches5(TokenType.KEYWORD) && !(_currentToken as KeywordToken).keyword.isPseudoKeyword()) {
+      Keyword keyword29 = (_currentToken as KeywordToken).keyword;
+      if (keyword29 == Keyword.ASSERT) {
+        return parseAssertStatement();
+      } else if (keyword29 == Keyword.BREAK) {
+        return parseBreakStatement();
+      } else if (keyword29 == Keyword.CONTINUE) {
+        return parseContinueStatement();
+      } else if (keyword29 == Keyword.DO) {
+        return parseDoStatement();
+      } else if (keyword29 == Keyword.FOR) {
+        return parseForStatement();
+      } else if (keyword29 == Keyword.IF) {
+        return parseIfStatement();
+      } else if (keyword29 == Keyword.RETURN) {
+        return parseReturnStatement();
+      } else if (keyword29 == Keyword.SWITCH) {
+        return parseSwitchStatement();
+      } else if (keyword29 == Keyword.THROW) {
+        return new ExpressionStatement(parseThrowExpression(), expect2(TokenType.SEMICOLON));
+      } else if (keyword29 == Keyword.TRY) {
+        return parseTryStatement();
+      } else if (keyword29 == Keyword.WHILE) {
+        return parseWhileStatement();
+      } else if (keyword29 == Keyword.VAR || keyword29 == Keyword.FINAL) {
+        return parseVariableDeclarationStatement();
+      } else if (keyword29 == Keyword.VOID) {
+        TypeName returnType = parseReturnType();
+        if (matchesIdentifier() && matchesAny(peek(), [TokenType.OPEN_PAREN, TokenType.OPEN_CURLY_BRACKET, TokenType.FUNCTION])) {
+          return parseFunctionDeclarationStatement2(commentAndMetadata, returnType);
+        } else {
+          if (matchesIdentifier()) {
+            if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
+              reportError(ParserErrorCode.VOID_VARIABLE, returnType, []);
+              return parseVariableDeclarationStatement();
+            }
+          }
+          return null;
+        }
+      } else if (keyword29 == Keyword.CONST) {
+        if (matchesAny(peek(), [TokenType.LT, TokenType.OPEN_CURLY_BRACKET, TokenType.OPEN_SQUARE_BRACKET, TokenType.INDEX])) {
+          return new ExpressionStatement(parseExpression2(), expect2(TokenType.SEMICOLON));
+        } else if (matches4(peek(), TokenType.IDENTIFIER)) {
+          Token afterType = skipTypeName(peek());
+          if (afterType != null) {
+            if (matches4(afterType, TokenType.OPEN_PAREN) || (matches4(afterType, TokenType.PERIOD) && matches4(afterType.next, TokenType.IDENTIFIER) && matches4(afterType.next.next, TokenType.OPEN_PAREN))) {
+              return new ExpressionStatement(parseExpression2(), expect2(TokenType.SEMICOLON));
+            }
+          }
+        }
+        return parseVariableDeclarationStatement();
+      } else if (keyword29 == Keyword.NEW || keyword29 == Keyword.TRUE || keyword29 == Keyword.FALSE || keyword29 == Keyword.NULL || keyword29 == Keyword.SUPER || keyword29 == Keyword.THIS) {
+        return new ExpressionStatement(parseExpression2(), expect2(TokenType.SEMICOLON));
+      } else {
+        return null;
+      }
+    } else if (matches5(TokenType.SEMICOLON)) {
+      return parseEmptyStatement();
+    } else if (isInitializedVariableDeclaration()) {
+      return parseVariableDeclarationStatement();
+    } else if (isFunctionDeclaration()) {
+      return parseFunctionDeclarationStatement();
+    } else {
+      return new ExpressionStatement(parseExpression2(), expect2(TokenType.SEMICOLON));
+    }
+  }
+  /**
+   * Parse a normal formal parameter.
+   * <pre>
+   * normalFormalParameter ::=
+   * functionSignature
+   * | fieldFormalParameter
+   * | simpleFormalParameter
+   * functionSignature:
+   * metadata returnType? identifier formalParameterList
+   * fieldFormalParameter ::=
+   * metadata finalConstVarOrType? 'this' '.' identifier
+   * simpleFormalParameter ::=
+   * declaredIdentifier
+   * | metadata identifier
+   * </pre>
+   * @return the normal formal parameter that was parsed
+   */
+  NormalFormalParameter parseNormalFormalParameter() {
+    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
+    FinalConstVarOrType holder = parseFinalConstVarOrType(true);
+    Token thisKeyword = null;
+    Token period = null;
+    if (matches(Keyword.THIS)) {
+      thisKeyword = andAdvance;
+      period = expect2(TokenType.PERIOD);
+    }
+    SimpleIdentifier identifier = parseSimpleIdentifier();
+    if (matches5(TokenType.OPEN_PAREN)) {
+      if (thisKeyword != null) {
+      }
+      FormalParameterList parameters = parseFormalParameterList();
+      return new FunctionTypedFormalParameter(commentAndMetadata.comment, commentAndMetadata.metadata, holder.type, identifier, parameters);
+    }
+    TypeName type18 = holder.type;
+    if (type18 != null && matches3(type18.name.beginToken, Keyword.VOID)) {
+      reportError4(ParserErrorCode.VOID_PARAMETER, type18.name.beginToken, []);
+    }
+    if (thisKeyword != null) {
+      return new FieldFormalParameter(commentAndMetadata.comment, commentAndMetadata.metadata, holder.keyword, holder.type, thisKeyword, period, identifier);
+    }
+    return new SimpleFormalParameter(commentAndMetadata.comment, commentAndMetadata.metadata, holder.keyword, holder.type, identifier);
+  }
+  /**
+   * Parse an operator declaration.
+   * <pre>
+   * operatorDeclaration ::=
+   * operatorSignature (';' | functionBody)
+   * operatorSignature ::=
+   * 'external'? returnType? 'operator' operator formalParameterList
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param externalKeyword the 'external' token
+   * @param the return type that has already been parsed, or {@code null} if there was no return
+   * type
+   * @return the operator declaration that was parsed
+   */
+  MethodDeclaration parseOperator(CommentAndMetadata commentAndMetadata, Token externalKeyword, TypeName returnType) {
+    Token operatorKeyword = expect(Keyword.OPERATOR);
+    if (!_currentToken.isUserDefinableOperator()) {
+      reportError3(ParserErrorCode.NON_USER_DEFINABLE_OPERATOR, [_currentToken.lexeme]);
+    }
+    SimpleIdentifier name = new SimpleIdentifier(andAdvance);
+    FormalParameterList parameters = parseFormalParameterList();
+    validateFormalParameterList(parameters);
+    FunctionBody body = parseFunctionBody(true, false);
+    if (externalKeyword != null && body is! EmptyFunctionBody) {
+      reportError3(ParserErrorCode.EXTERNAL_OPERATOR_WITH_BODY, []);
+    }
+    return new MethodDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, null, returnType, null, operatorKeyword, name, parameters, body);
+  }
+  /**
+   * Parse a return type if one is given, otherwise return {@code null} without advancing.
+   * @return the return type that was parsed
+   */
+  TypeName parseOptionalReturnType() {
+    if (matches(Keyword.VOID)) {
+      return parseReturnType();
+    } else if (matchesIdentifier() && !matches(Keyword.GET) && !matches(Keyword.SET) && !matches(Keyword.OPERATOR) && (matchesIdentifier2(peek()) || matches4(peek(), TokenType.LT))) {
+      return parseReturnType();
+    } else if (matchesIdentifier() && matches4(peek(), TokenType.PERIOD) && matchesIdentifier2(peek2(2)) && (matchesIdentifier2(peek2(3)) || matches4(peek2(3), TokenType.LT))) {
+      return parseReturnType();
+    }
+    return null;
+  }
+  /**
+   * Parse a part or part-of directive.
+   * <pre>
+   * partDirective ::=
+   * metadata 'part' stringLiteral ';'
+   * partOfDirective ::=
+   * metadata 'part' 'of' identifier ';'
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the directive
+   * @return the part or part-of directive that was parsed
+   */
+  Directive parsePartDirective(CommentAndMetadata commentAndMetadata) {
+    Token partKeyword = expect(Keyword.PART);
+    if (matches2(Parser._OF)) {
+      Token ofKeyword = andAdvance;
+      LibraryIdentifier libraryName = parseLibraryName(ParserErrorCode.MISSING_NAME_IN_PART_OF_DIRECTIVE, ofKeyword);
+      Token semicolon = expect2(TokenType.SEMICOLON);
+      return new PartOfDirective(commentAndMetadata.comment, commentAndMetadata.metadata, partKeyword, ofKeyword, libraryName, semicolon);
+    }
+    StringLiteral partUri = parseStringLiteral();
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new PartDirective(commentAndMetadata.comment, commentAndMetadata.metadata, partKeyword, partUri, semicolon);
+  }
+  /**
+   * Parse a postfix expression.
+   * <pre>
+   * postfixExpression ::=
+   * assignableExpression postfixOperator
+   * | primary selector
+   * selector ::=
+   * assignableSelector
+   * | argumentList
+   * </pre>
+   * @return the postfix expression that was parsed
+   */
+  Expression parsePostfixExpression() {
+    Expression operand = parseAssignableExpression(true);
+    if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.PERIOD) || matches5(TokenType.OPEN_PAREN)) {
+      do {
+        if (matches5(TokenType.OPEN_PAREN)) {
+          ArgumentList argumentList = parseArgumentList();
+          if (operand is PropertyAccess) {
+            PropertyAccess access = operand as PropertyAccess;
+            operand = new MethodInvocation(access.target, access.operator, access.propertyName, argumentList);
+          } else {
+            operand = new FunctionExpressionInvocation(operand, argumentList);
+          }
+        } else {
+          operand = parseAssignableSelector(operand, true);
+        }
+      } while (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.PERIOD) || matches5(TokenType.OPEN_PAREN));
+      return operand;
+    }
+    if (!_currentToken.type.isIncrementOperator()) {
+      return operand;
+    }
+    if (operand is FunctionExpressionInvocation) {
+      reportError3(ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR, []);
+    }
+    Token operator = andAdvance;
+    return new PostfixExpression(operand, operator);
+  }
+  /**
+   * Parse a prefixed identifier.
+   * <pre>
+   * prefixedIdentifier ::=
+   * identifier ('.' identifier)?
+   * </pre>
+   * @return the prefixed identifier that was parsed
+   */
+  Identifier parsePrefixedIdentifier() {
+    SimpleIdentifier qualifier = parseSimpleIdentifier();
+    if (!matches5(TokenType.PERIOD)) {
+      return qualifier;
+    }
+    Token period = andAdvance;
+    SimpleIdentifier qualified = parseSimpleIdentifier();
+    return new PrefixedIdentifier(qualifier, period, qualified);
+  }
+  /**
+   * Parse a primary expression.
+   * <pre>
+   * primary ::=
+   * thisExpression
+   * | 'super' assignableSelector
+   * | functionExpression
+   * | literal
+   * | identifier
+   * | newExpression
+   * | constObjectExpression
+   * | '(' expression ')'
+   * | argumentDefinitionTest
+   * literal ::=
+   * nullLiteral
+   * | booleanLiteral
+   * | numericLiteral
+   * | stringLiteral
+   * | mapLiteral
+   * | listLiteral
+   * </pre>
+   * @return the primary expression that was parsed
+   */
+  Expression parsePrimaryExpression() {
+    if (matches(Keyword.THIS)) {
+      return new ThisExpression(andAdvance);
+    } else if (matches(Keyword.SUPER)) {
+      return parseAssignableSelector(new SuperExpression(andAdvance), false);
+    } else if (matches(Keyword.NULL)) {
+      return new NullLiteral(andAdvance);
+    } else if (matches(Keyword.FALSE)) {
+      return new BooleanLiteral(andAdvance, false);
+    } else if (matches(Keyword.TRUE)) {
+      return new BooleanLiteral(andAdvance, true);
+    } else if (matches5(TokenType.DOUBLE)) {
+      Token token = andAdvance;
+      double value = 0.0;
+      try {
+        value = double.parse(token.lexeme);
+      } on NumberFormatException catch (exception) {
+      }
+      return new DoubleLiteral(token, value);
+    } else if (matches5(TokenType.HEXADECIMAL)) {
+      Token token = andAdvance;
+      int value = null;
+      try {
+        value = int.parse(token.lexeme.substring(2), radix: 16);
+      } on NumberFormatException catch (exception) {
+      }
+      return new IntegerLiteral.con1(token, value);
+    } else if (matches5(TokenType.INT)) {
+      Token token = andAdvance;
+      int value = null;
+      try {
+        value = int.parse(token.lexeme);
+      } on NumberFormatException catch (exception) {
+      }
+      return new IntegerLiteral.con1(token, value);
+    } else if (matches5(TokenType.STRING)) {
+      return parseStringLiteral();
+    } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
+      return parseMapLiteral(null, null);
+    } else if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.INDEX)) {
+      return parseListLiteral(null, null);
+    } else if (matchesIdentifier()) {
+      return parsePrefixedIdentifier();
+    } else if (matches(Keyword.NEW)) {
+      return parseNewExpression();
+    } else if (matches(Keyword.CONST)) {
+      return parseConstExpression();
+    } else if (matches5(TokenType.OPEN_PAREN)) {
+      if (isFunctionExpression(_currentToken)) {
+        return parseFunctionExpression();
+      }
+      Token leftParenthesis = andAdvance;
+      Expression expression = parseExpression2();
+      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+      return new ParenthesizedExpression(leftParenthesis, expression, rightParenthesis);
+    } else if (matches5(TokenType.LT)) {
+      return parseListOrMapLiteral(null);
+    } else if (matches5(TokenType.QUESTION)) {
+      return parseArgumentDefinitionTest();
+    } else if (matches(Keyword.VOID)) {
+      reportError3(ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken.lexeme]);
+      advance();
+      return parsePrimaryExpression();
+    } else {
+      return createSyntheticIdentifier();
+    }
+  }
+  /**
+   * Parse a redirecting constructor invocation.
+   * <pre>
+   * redirectingConstructorInvocation ::=
+   * 'this' ('.' identifier)? arguments
+   * </pre>
+   * @return the redirecting constructor invocation that was parsed
+   */
+  RedirectingConstructorInvocation parseRedirectingConstructorInvocation() {
+    Token keyword = expect(Keyword.THIS);
+    Token period = null;
+    SimpleIdentifier constructorName = null;
+    if (matches5(TokenType.PERIOD)) {
+      period = andAdvance;
+      constructorName = parseSimpleIdentifier();
+    }
+    ArgumentList argumentList = parseArgumentList();
+    return new RedirectingConstructorInvocation(keyword, period, constructorName, argumentList);
+  }
+  /**
+   * Parse a relational expression.
+   * <pre>
+   * relationalExpression ::=
+   * shiftExpression ('is' type | 'as' type | relationalOperator shiftExpression)?
+   * | 'super' relationalOperator shiftExpression
+   * </pre>
+   * @return the relational expression that was parsed
+   */
+  Expression parseRelationalExpression() {
+    if (matches(Keyword.SUPER) && _currentToken.next.type.isRelationalOperator()) {
+      Expression expression = new SuperExpression(andAdvance);
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseShiftExpression());
+      return expression;
+    }
+    Expression expression = parseShiftExpression();
+    if (matches(Keyword.AS)) {
+      Token isOperator = andAdvance;
+      expression = new AsExpression(expression, isOperator, parseTypeName());
+    } else if (matches(Keyword.IS)) {
+      Token isOperator = andAdvance;
+      Token notOperator = null;
+      if (matches5(TokenType.BANG)) {
+        notOperator = andAdvance;
+      }
+      expression = new IsExpression(expression, isOperator, notOperator, parseTypeName());
+    } else if (_currentToken.type.isRelationalOperator()) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseShiftExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a return statement.
+   * <pre>
+   * returnStatement ::=
+   * 'return' expression? ';'
+   * </pre>
+   * @return the return statement that was parsed
+   */
+  Statement parseReturnStatement() {
+    Token returnKeyword = expect(Keyword.RETURN);
+    if (matches5(TokenType.SEMICOLON)) {
+      return new ReturnStatement(returnKeyword, null, andAdvance);
+    }
+    Expression expression = parseExpression2();
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new ReturnStatement(returnKeyword, expression, semicolon);
+  }
+  /**
+   * Parse a return type.
+   * <pre>
+   * returnType ::=
+   * 'void'
+   * | type
+   * </pre>
+   * @return the return type that was parsed
+   */
+  TypeName parseReturnType() {
+    if (matches(Keyword.VOID)) {
+      return new TypeName(new SimpleIdentifier(andAdvance), null);
+    } else {
+      return parseTypeName();
+    }
+  }
+  /**
+   * Parse a setter.
+   * <pre>
+   * setter ::=
+   * setterSignature functionBody?
+   * setterSignature ::=
+   * 'external'? 'static'? returnType? 'set' identifier formalParameterList
+   * </pre>
+   * @param commentAndMetadata the documentation comment and metadata to be associated with the
+   * declaration
+   * @param externalKeyword the 'external' token
+   * @param staticKeyword the static keyword, or {@code null} if the setter is not static
+   * @param the return type that has already been parsed, or {@code null} if there was no return
+   * type
+   * @return the setter that was parsed
+   */
+  MethodDeclaration parseSetter(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType) {
+    Token propertyKeyword = expect(Keyword.SET);
+    SimpleIdentifier name = parseSimpleIdentifier();
+    FormalParameterList parameters = parseFormalParameterList();
+    validateFormalParameterList(parameters);
+    FunctionBody body = parseFunctionBody(true, false);
+    if (externalKeyword != null && body is! EmptyFunctionBody) {
+      reportError3(ParserErrorCode.EXTERNAL_SETTER_WITH_BODY, []);
+    }
+    return new MethodDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType, propertyKeyword, null, name, parameters, body);
+  }
+  /**
+   * Parse a shift expression.
+   * <pre>
+   * shiftExpression ::=
+   * additiveExpression (shiftOperator additiveExpression)
+   * | 'super' (shiftOperator additiveExpression)+
+   * </pre>
+   * @return the shift expression that was parsed
+   */
+  Expression parseShiftExpression() {
+    Expression expression;
+    if (matches(Keyword.SUPER) && _currentToken.next.type.isShiftOperator()) {
+      expression = new SuperExpression(andAdvance);
+    } else {
+      expression = parseAdditiveExpression();
+    }
+    while (_currentToken.type.isShiftOperator()) {
+      Token operator = andAdvance;
+      expression = new BinaryExpression(expression, operator, parseAdditiveExpression());
+    }
+    return expression;
+  }
+  /**
+   * Parse a simple identifier.
+   * <pre>
+   * identifier ::=
+   * IDENTIFIER
+   * </pre>
+   * @return the simple identifier that was parsed
+   */
+  SimpleIdentifier parseSimpleIdentifier() {
+    if (matchesIdentifier()) {
+      return new SimpleIdentifier(andAdvance);
+    }
+    reportError3(ParserErrorCode.MISSING_IDENTIFIER, []);
+    return createSyntheticIdentifier();
+  }
+  /**
+   * Parse a simple identifier and validate that it is not a built-in identifier.
+   * <pre>
+   * identifier ::=
+   * IDENTIFIER
+   * </pre>
+   * @param errorCode the error code to be used to report a built-in identifier if one is found
+   * @return the simple identifier that was parsed
+   */
+  SimpleIdentifier parseSimpleIdentifier2(ParserErrorCode errorCode) {
+    if (matchesIdentifier()) {
+      Token token = andAdvance;
+      if (token.type == TokenType.KEYWORD) {
+        reportError4(errorCode, token, [token.lexeme]);
+      }
+      return new SimpleIdentifier(token);
+    }
+    reportError3(ParserErrorCode.MISSING_IDENTIFIER, []);
+    return createSyntheticIdentifier();
+  }
+  /**
+   * Parse a statement.
+   * <pre>
+   * statement ::=
+   * label* nonLabeledStatement
+   * </pre>
+   * @return the statement that was parsed
+   */
+  Statement parseStatement2() {
+    List<Label> labels = new List<Label>();
+    while (matchesIdentifier() && matches4(peek(), TokenType.COLON)) {
+      SimpleIdentifier label = parseSimpleIdentifier();
+      Token colon = expect2(TokenType.COLON);
+      labels.add(new Label(label, colon));
+    }
+    Statement statement = parseNonLabeledStatement();
+    if (labels.isEmpty) {
+      return statement;
+    }
+    return new LabeledStatement(labels, statement);
+  }
+  /**
+   * Parse a list of statements within a switch statement.
+   * <pre>
+   * statements ::=
+   * statement
+   * </pre>
+   * @return the statements that were parsed
+   */
+  List<Statement> parseStatements2() {
+    List<Statement> statements = new List<Statement>();
+    Token statementStart = _currentToken;
+    while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET) && !isSwitchMember()) {
+      statements.add(parseStatement2());
+      if (_currentToken == statementStart) {
+        reportError4(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
+        advance();
+      }
+      statementStart = _currentToken;
+    }
+    return statements;
+  }
+  /**
+   * Parse a string literal that contains interpolations.
+   * @return the string literal that was parsed
+   */
+  StringInterpolation parseStringInterpolation(Token string) {
+    List<InterpolationElement> elements = new List<InterpolationElement>();
+    elements.add(new InterpolationString(string, computeStringValue(string.lexeme)));
+    while (matches5(TokenType.STRING_INTERPOLATION_EXPRESSION) || matches5(TokenType.STRING_INTERPOLATION_IDENTIFIER)) {
+      if (matches5(TokenType.STRING_INTERPOLATION_EXPRESSION)) {
+        Token openToken = andAdvance;
+        Expression expression = parseExpression2();
+        Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
+        elements.add(new InterpolationExpression(openToken, expression, rightBracket));
+      } else {
+        Token openToken = andAdvance;
+        Expression expression = null;
+        if (matches(Keyword.THIS)) {
+          expression = new ThisExpression(andAdvance);
+        } else {
+          expression = parseSimpleIdentifier();
+        }
+        elements.add(new InterpolationExpression(openToken, expression, null));
+      }
+      if (matches5(TokenType.STRING)) {
+        string = andAdvance;
+        elements.add(new InterpolationString(string, computeStringValue(string.lexeme)));
+      }
+    }
+    return new StringInterpolation(elements);
+  }
+  /**
+   * Parse a string literal.
+   * <pre>
+   * stringLiteral ::=
+   * MULTI_LINE_STRING+
+   * | SINGLE_LINE_STRING+
+   * </pre>
+   * @return the string literal that was parsed
+   */
+  StringLiteral parseStringLiteral() {
+    List<StringLiteral> strings = new List<StringLiteral>();
+    while (matches5(TokenType.STRING)) {
+      Token string = andAdvance;
+      if (matches5(TokenType.STRING_INTERPOLATION_EXPRESSION) || matches5(TokenType.STRING_INTERPOLATION_IDENTIFIER)) {
+        strings.add(parseStringInterpolation(string));
+      } else {
+        strings.add(new SimpleStringLiteral(string, computeStringValue(string.lexeme)));
+      }
+    }
+    if (strings.length < 1) {
+      reportError3(ParserErrorCode.EXPECTED_STRING_LITERAL, []);
+      return createSyntheticStringLiteral();
+    } else if (strings.length == 1) {
+      return strings[0];
+    } else {
+      return new AdjacentStrings(strings);
+    }
+  }
+  /**
+   * Parse a super constructor invocation.
+   * <pre>
+   * superConstructorInvocation ::=
+   * 'super' ('.' identifier)? arguments
+   * </pre>
+   * @return the super constructor invocation that was parsed
+   */
+  SuperConstructorInvocation parseSuperConstructorInvocation() {
+    Token keyword = expect(Keyword.SUPER);
+    Token period = null;
+    SimpleIdentifier constructorName = null;
+    if (matches5(TokenType.PERIOD)) {
+      period = andAdvance;
+      constructorName = parseSimpleIdentifier();
+    }
+    ArgumentList argumentList = parseArgumentList();
+    return new SuperConstructorInvocation(keyword, period, constructorName, argumentList);
+  }
+  /**
+   * Parse a switch statement.
+   * <pre>
+   * switchStatement ::=
+   * 'switch' '(' expression ')' '{' switchCase* defaultCase? '}'
+   * switchCase ::=
+   * label* ('case' expression ':') statements
+   * defaultCase ::=
+   * label* 'default' ':' statements
+   * </pre>
+   * @return the switch statement that was parsed
+   */
+  SwitchStatement parseSwitchStatement() {
+    bool wasInSwitch = _inSwitch;
+    _inSwitch = true;
+    try {
+      Set<String> definedLabels = new Set<String>();
+      Token keyword = expect(Keyword.SWITCH);
+      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+      Expression expression = parseExpression2();
+      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+      Token leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
+      List<SwitchMember> members = new List<SwitchMember>();
+      while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET)) {
+        List<Label> labels = new List<Label>();
+        while (matchesIdentifier() && matches4(peek(), TokenType.COLON)) {
+          SimpleIdentifier identifier = parseSimpleIdentifier();
+          String label = identifier.token.lexeme;
+          if (definedLabels.contains(label)) {
+            reportError4(ParserErrorCode.DUPLICATE_LABEL_IN_SWITCH_STATEMENT, identifier.token, [label]);
+          } else {
+            javaSetAdd(definedLabels, label);
+          }
+          Token colon = expect2(TokenType.COLON);
+          labels.add(new Label(identifier, colon));
+        }
+        if (matches(Keyword.CASE)) {
+          Token caseKeyword = andAdvance;
+          Expression caseExpression = parseExpression2();
+          Token colon = expect2(TokenType.COLON);
+          members.add(new SwitchCase(labels, caseKeyword, caseExpression, colon, parseStatements2()));
+        } else if (matches(Keyword.DEFAULT)) {
+          Token defaultKeyword = andAdvance;
+          Token colon = expect2(TokenType.COLON);
+          members.add(new SwitchDefault(labels, defaultKeyword, colon, parseStatements2()));
+        } else {
+          reportError3(ParserErrorCode.EXPECTED_CASE_OR_DEFAULT, []);
+          while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET) && !matches(Keyword.CASE) && !matches(Keyword.DEFAULT)) {
+            advance();
+          }
+        }
+      }
+      Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
+      return new SwitchStatement(keyword, leftParenthesis, expression, rightParenthesis, leftBracket, members, rightBracket);
+    } finally {
+      _inSwitch = wasInSwitch;
+    }
+  }
+  /**
+   * Parse a throw expression.
+   * <pre>
+   * throwExpression ::=
+   * 'throw' expression? ';'
+   * </pre>
+   * @return the throw expression that was parsed
+   */
+  Expression parseThrowExpression() {
+    Token keyword = expect(Keyword.THROW);
+    if (matches5(TokenType.SEMICOLON) || matches5(TokenType.CLOSE_PAREN)) {
+      return new ThrowExpression(keyword, null);
+    }
+    Expression expression = parseExpression2();
+    return new ThrowExpression(keyword, expression);
+  }
+  /**
+   * Parse a throw expression.
+   * <pre>
+   * throwExpressionWithoutCascade ::=
+   * 'throw' expressionWithoutCascade? ';'
+   * </pre>
+   * @return the throw expression that was parsed
+   */
+  Expression parseThrowExpressionWithoutCascade() {
+    Token keyword = expect(Keyword.THROW);
+    if (matches5(TokenType.SEMICOLON) || matches5(TokenType.CLOSE_PAREN)) {
+      return new ThrowExpression(keyword, null);
+    }
+    Expression expression = parseExpressionWithoutCascade();
+    return new ThrowExpression(keyword, expression);
+  }
+  /**
+   * Parse a try statement.
+   * <pre>
+   * tryStatement ::=
+   * 'try' block (onPart+ finallyPart? | finallyPart)
+   * onPart ::=
+   * catchPart block
+   * | 'on' qualified catchPart? block
+   * catchPart ::=
+   * 'catch' '(' identifier (',' identifier)? ')'
+   * finallyPart ::=
+   * 'finally' block
+   * </pre>
+   * @return the try statement that was parsed
+   */
+  Statement parseTryStatement() {
+    Token tryKeyword = expect(Keyword.TRY);
+    Block body = parseBlock();
+    List<CatchClause> catchClauses = new List<CatchClause>();
+    Block finallyClause = null;
+    while (matches2(Parser._ON) || matches(Keyword.CATCH)) {
+      Token onKeyword = null;
+      TypeName exceptionType = null;
+      if (matches2(Parser._ON)) {
+        onKeyword = andAdvance;
+        exceptionType = new TypeName(parsePrefixedIdentifier(), null);
+      }
+      Token catchKeyword = null;
+      Token leftParenthesis = null;
+      SimpleIdentifier exceptionParameter = null;
+      Token comma = null;
+      SimpleIdentifier stackTraceParameter = null;
+      Token rightParenthesis = null;
+      if (matches(Keyword.CATCH)) {
+        catchKeyword = andAdvance;
+        leftParenthesis = expect2(TokenType.OPEN_PAREN);
+        exceptionParameter = parseSimpleIdentifier();
+        if (matches5(TokenType.COMMA)) {
+          comma = andAdvance;
+          stackTraceParameter = parseSimpleIdentifier();
+        }
+        rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+      }
+      Block catchBody = parseBlock();
+      catchClauses.add(new CatchClause(onKeyword, exceptionType, catchKeyword, leftParenthesis, exceptionParameter, comma, stackTraceParameter, rightParenthesis, catchBody));
+    }
+    Token finallyKeyword = null;
+    if (matches(Keyword.FINALLY)) {
+      finallyKeyword = andAdvance;
+      finallyClause = parseBlock();
+    } else {
+      if (catchClauses.isEmpty) {
+        reportError3(ParserErrorCode.MISSING_CATCH_OR_FINALLY, []);
+      }
+    }
+    return new TryStatement(tryKeyword, body, catchClauses, finallyKeyword, finallyClause);
+  }
+  /**
+   * Parse a type alias.
+   * <pre>
+   * typeAlias ::=
+   * 'typedef' typeAliasBody
+   * typeAliasBody ::=
+   * classTypeAlias
+   * | functionTypeAlias
+   * classTypeAlias ::=
+   * identifier typeParameters? '=' 'abstract'? mixinApplication
+   * mixinApplication ::=
+   * qualified withClause implementsClause? ';'
+   * functionTypeAlias ::=
+   * functionPrefix typeParameterList? formalParameterList ';'
+   * functionPrefix ::=
+   * returnType? name
+   * </pre>
+   * @param commentAndMetadata the metadata to be associated with the member
+   * @return the type alias that was parsed
+   */
+  TypeAlias parseTypeAlias(CommentAndMetadata commentAndMetadata) {
+    Token keyword = expect(Keyword.TYPEDEF);
+    if (matchesIdentifier()) {
+      Token next = peek();
+      if (matches4(next, TokenType.LT)) {
+        next = skipTypeParameterList(next);
+        if (next != null && matches4(next, TokenType.EQ)) {
+          return parseClassTypeAlias(commentAndMetadata, keyword);
+        }
+      } else if (matches4(next, TokenType.EQ)) {
+        return parseClassTypeAlias(commentAndMetadata, keyword);
+      }
+    }
+    return parseFunctionTypeAlias(commentAndMetadata, keyword);
+  }
+  /**
+   * Parse a list of type arguments.
+   * <pre>
+   * typeArguments ::=
+   * '<' typeList '>'
+   * typeList ::=
+   * type (',' type)
+   * </pre>
+   * @return the type argument list that was parsed
+   */
+  TypeArgumentList parseTypeArgumentList() {
+    Token leftBracket = expect2(TokenType.LT);
+    List<TypeName> arguments = new List<TypeName>();
+    arguments.add(parseTypeName());
+    while (optional(TokenType.COMMA)) {
+      arguments.add(parseTypeName());
+    }
+    Token rightBracket = expect2(TokenType.GT);
+    return new TypeArgumentList(leftBracket, arguments, rightBracket);
+  }
+  /**
+   * Parse a type name.
+   * <pre>
+   * type ::=
+   * qualified typeArguments?
+   * </pre>
+   * @return the type name that was parsed
+   */
+  TypeName parseTypeName() {
+    Identifier typeName = parsePrefixedIdentifier();
+    TypeArgumentList typeArguments = null;
+    if (matches5(TokenType.LT)) {
+      typeArguments = parseTypeArgumentList();
+    }
+    return new TypeName(typeName, typeArguments);
+  }
+  /**
+   * Parse a type parameter.
+   * <pre>
+   * typeParameter ::=
+   * metadata name ('extends' bound)?
+   * </pre>
+   * @return the type parameter that was parsed
+   */
+  TypeParameter parseTypeParameter() {
+    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
+    SimpleIdentifier name = parseSimpleIdentifier2(ParserErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE_VARIABLE_NAME);
+    if (matches(Keyword.EXTENDS)) {
+      Token keyword = andAdvance;
+      TypeName bound = parseTypeName();
+      return new TypeParameter(commentAndMetadata.comment, commentAndMetadata.metadata, name, keyword, bound);
+    }
+    return new TypeParameter(commentAndMetadata.comment, commentAndMetadata.metadata, name, null, null);
+  }
+  /**
+   * Parse a list of type parameters.
+   * <pre>
+   * typeParameterList ::=
+   * '<' typeParameter (',' typeParameter)* '>'
+   * </pre>
+   * @return the list of type parameters that were parsed
+   */
+  TypeParameterList parseTypeParameterList() {
+    Token leftBracket = expect2(TokenType.LT);
+    List<TypeParameter> typeParameters = new List<TypeParameter>();
+    typeParameters.add(parseTypeParameter());
+    while (optional(TokenType.COMMA)) {
+      typeParameters.add(parseTypeParameter());
+    }
+    Token rightBracket = expect2(TokenType.GT);
+    return new TypeParameterList(leftBracket, typeParameters, rightBracket);
+  }
+  /**
+   * Parse a unary expression.
+   * <pre>
+   * unaryExpression ::=
+   * prefixOperator unaryExpression
+   * | postfixExpression
+   * | unaryOperator 'super'
+   * | '-' 'super'
+   * | incrementOperator assignableExpression
+   * </pre>
+   * @return the unary expression that was parsed
+   */
+  Expression parseUnaryExpression() {
+    if (matches5(TokenType.MINUS) || matches5(TokenType.BANG) || matches5(TokenType.TILDE)) {
+      Token operator = andAdvance;
+      if (matches(Keyword.SUPER)) {
+        if (matches4(peek(), TokenType.OPEN_SQUARE_BRACKET) || matches4(peek(), TokenType.PERIOD)) {
+          return new PrefixExpression(operator, parseUnaryExpression());
+        }
+        return new PrefixExpression(operator, new SuperExpression(andAdvance));
+      }
+      return new PrefixExpression(operator, parseUnaryExpression());
+    } else if (_currentToken.type.isIncrementOperator()) {
+      Token operator = andAdvance;
+      if (matches(Keyword.SUPER)) {
+        if (operator.type == TokenType.MINUS_MINUS) {
+          int offset7 = operator.offset;
+          Token firstOperator = new Token(TokenType.MINUS, offset7);
+          Token secondOperator = new Token(TokenType.MINUS, offset7 + 1);
+          secondOperator.setNext(_currentToken);
+          firstOperator.setNext(secondOperator);
+          operator.previous.setNext(firstOperator);
+          return new PrefixExpression(firstOperator, new PrefixExpression(secondOperator, new SuperExpression(andAdvance)));
+        } else {
+          reportError3(ParserErrorCode.INVALID_OPERATOR_FOR_SUPER, [operator.lexeme]);
+          return new PrefixExpression(operator, new SuperExpression(andAdvance));
+        }
+      }
+      return new PrefixExpression(operator, parseAssignableExpression(false));
+    } else if (matches5(TokenType.PLUS)) {
+      reportError3(ParserErrorCode.USE_OF_UNARY_PLUS_OPERATOR, []);
+    }
+    return parsePostfixExpression();
+  }
+  /**
+   * Parse a variable declaration.
+   * <pre>
+   * variableDeclaration ::=
+   * identifier ('=' expression)?
+   * </pre>
+   * @return the variable declaration that was parsed
+   */
+  VariableDeclaration parseVariableDeclaration() {
+    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
+    SimpleIdentifier name = parseSimpleIdentifier();
+    Token equals = null;
+    Expression initializer = null;
+    if (matches5(TokenType.EQ)) {
+      equals = andAdvance;
+      initializer = parseExpression2();
+    }
+    return new VariableDeclaration(commentAndMetadata.comment, commentAndMetadata.metadata, name, equals, initializer);
+  }
+  /**
+   * Parse a variable declaration list.
+   * <pre>
+   * variableDeclarationList ::=
+   * finalConstVarOrType variableDeclaration (',' variableDeclaration)
+   * </pre>
+   * @return the variable declaration list that was parsed
+   */
+  VariableDeclarationList parseVariableDeclarationList() {
+    FinalConstVarOrType holder = parseFinalConstVarOrType(false);
+    return parseVariableDeclarationList2(holder.keyword, holder.type);
+  }
+  /**
+   * Parse a variable declaration list.
+   * <pre>
+   * variableDeclarationList ::=
+   * finalConstVarOrType variableDeclaration (',' variableDeclaration)
+   * </pre>
+   * @param keyword the token representing the 'final', 'const' or 'var' keyword, or {@code null} if
+   * there is no keyword
+   * @param type the type of the variables in the list
+   * @return the variable declaration list that was parsed
+   */
+  VariableDeclarationList parseVariableDeclarationList2(Token keyword, TypeName type) {
+    List<VariableDeclaration> variables = new List<VariableDeclaration>();
+    variables.add(parseVariableDeclaration());
+    while (matches5(TokenType.COMMA)) {
+      advance();
+      variables.add(parseVariableDeclaration());
+    }
+    return new VariableDeclarationList(keyword, type, variables);
+  }
+  /**
+   * Parse a variable declaration statement.
+   * <pre>
+   * variableDeclarationStatement ::=
+   * variableDeclarationList ';'
+   * </pre>
+   * @return the variable declaration statement that was parsed
+   */
+  VariableDeclarationStatement parseVariableDeclarationStatement() {
+    VariableDeclarationList variableList = parseVariableDeclarationList();
+    Token semicolon = expect2(TokenType.SEMICOLON);
+    return new VariableDeclarationStatement(variableList, semicolon);
+  }
+  /**
+   * Parse a while statement.
+   * <pre>
+   * whileStatement ::=
+   * 'while' '(' expression ')' statement
+   * </pre>
+   * @return the while statement that was parsed
+   */
+  Statement parseWhileStatement() {
+    bool wasInLoop = _inLoop;
+    _inLoop = true;
+    try {
+      Token keyword = expect(Keyword.WHILE);
+      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
+      Expression condition = parseExpression2();
+      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
+      Statement body = parseStatement2();
+      return new WhileStatement(keyword, leftParenthesis, condition, rightParenthesis, body);
+    } finally {
+      _inLoop = wasInLoop;
+    }
+  }
+  /**
+   * Parse a with clause.
+   * <pre>
+   * withClause ::=
+   * 'with' typeName (',' typeName)
+   * </pre>
+   * @return the with clause that was parsed
+   */
+  WithClause parseWithClause() {
+    Token with6 = expect(Keyword.WITH);
+    List<TypeName> types = new List<TypeName>();
+    types.add(parseTypeName());
+    while (optional(TokenType.COMMA)) {
+      types.add(parseTypeName());
+    }
+    return new WithClause(with6, types);
+  }
+  /**
+   * Return the token that is immediately after the current token. This is equivalent to{@link #peek(int) peek(1)}.
+   * @return the token that is immediately after the current token
+   */
+  Token peek() => _currentToken.next;
+  /**
+   * Return the token that is the given distance after the current token.
+   * @param distance the number of tokens to look ahead, where {@code 0} is the current token,{@code 1} is the next token, etc.
+   * @return the token that is the given distance after the current token
+   */
+  Token peek2(int distance) {
+    Token token = _currentToken;
+    for (int i = 0; i < distance; i++) {
+      token = token.next;
+    }
+    return token;
+  }
+  /**
+   * Report an error with the given error code and arguments.
+   * @param errorCode the error code of the error to be reported
+   * @param node the node specifying the location of the error
+   * @param arguments the arguments to the error, used to compose the error message
+   */
+  void reportError(ParserErrorCode errorCode, ASTNode node, List<Object> arguments) {
+    _errorListener.onError(new AnalysisError.con2(_source, node.offset, node.length, errorCode, [arguments]));
+  }
+  /**
+   * Report an error with the given error code and arguments.
+   * @param errorCode the error code of the error to be reported
+   * @param arguments the arguments to the error, used to compose the error message
+   */
+  void reportError3(ParserErrorCode errorCode, List<Object> arguments) {
+    reportError4(errorCode, _currentToken, arguments);
+  }
+  /**
+   * Report an error with the given error code and arguments.
+   * @param errorCode the error code of the error to be reported
+   * @param token the token specifying the location of the error
+   * @param arguments the arguments to the error, used to compose the error message
+   */
+  void reportError4(ParserErrorCode errorCode, Token token, List<Object> arguments) {
+    _errorListener.onError(new AnalysisError.con2(_source, token.offset, token.length, errorCode, [arguments]));
+  }
+  /**
+   * Parse the 'final', 'const', 'var' or type preceding a variable declaration, starting at the
+   * given token, without actually creating a type or changing the current token. Return the token
+   * following the type that was parsed, or {@code null} if the given token is not the first token
+   * in a valid type.
+   * <pre>
+   * finalConstVarOrType ::=
+   * | 'final' type?
+   * | 'const' type?
+   * | 'var'
+   * | type
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the type that was parsed
+   */
+  Token skipFinalConstVarOrType(Token startToken) {
+    if (matches3(startToken, Keyword.FINAL) || matches3(startToken, Keyword.CONST)) {
+      Token next2 = startToken.next;
+      if (matchesIdentifier2(next2.next) || matches4(next2.next, TokenType.LT) || matches3(next2.next, Keyword.THIS)) {
+        return skipTypeName(next2);
+      }
+    } else if (matches3(startToken, Keyword.VAR)) {
+      return startToken.next;
+    } else if (matchesIdentifier2(startToken)) {
+      Token next3 = startToken.next;
+      if (matchesIdentifier2(next3) || matches4(next3, TokenType.LT) || matches3(next3, Keyword.THIS) || (matches4(next3, TokenType.PERIOD) && matchesIdentifier2(next3.next) && (matchesIdentifier2(next3.next.next) || matches4(next3.next.next, TokenType.LT) || matches3(next3.next.next, Keyword.THIS)))) {
+        return skipReturnType(startToken);
+      }
+    }
+    return null;
+  }
+  /**
+   * Parse a list of formal parameters, starting at the given token, without actually creating a
+   * formal parameter list or changing the current token. Return the token following the formal
+   * parameter list that was parsed, or {@code null} if the given token is not the first token in a
+   * valid list of formal parameter.
+   * <p>
+   * Note that unlike other skip methods, this method uses a heuristic. In the worst case, the
+   * parameters could be prefixed by metadata, which would require us to be able to skip arbitrary
+   * expressions. Rather than duplicate the logic of most of the parse methods we simply look for
+   * something that is likely to be a list of parameters and then skip to returning the token after
+   * the closing parenthesis.
+   * <p>
+   * This method must be kept in sync with {@link #parseFormalParameterList()}.
+   * <pre>
+   * formalParameterList ::=
+   * '(' ')'
+   * | '(' normalFormalParameters (',' optionalFormalParameters)? ')'
+   * | '(' optionalFormalParameters ')'
+   * normalFormalParameters ::=
+   * normalFormalParameter (',' normalFormalParameter)
+   * optionalFormalParameters ::=
+   * optionalPositionalFormalParameters
+   * | namedFormalParameters
+   * optionalPositionalFormalParameters ::=
+   * '[' defaultFormalParameter (',' defaultFormalParameter)* ']'
+   * namedFormalParameters ::=
+   * '{' defaultNamedParameter (',' defaultNamedParameter)* '}'
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the formal parameter list that was parsed
+   */
+  Token skipFormalParameterList(Token startToken) {
+    if (!matches4(startToken, TokenType.OPEN_PAREN)) {
+      return null;
+    }
+    Token next4 = startToken.next;
+    if (matches4(next4, TokenType.CLOSE_PAREN)) {
+      return next4.next;
+    }
+    if (matchesAny(next4, [TokenType.AT, TokenType.OPEN_SQUARE_BRACKET, TokenType.OPEN_CURLY_BRACKET]) || matches3(next4, Keyword.VOID) || (matchesIdentifier2(next4) && (matchesAny(next4.next, [TokenType.COMMA, TokenType.CLOSE_PAREN])))) {
+      return skipPastMatchingToken(startToken);
+    }
+    if (matchesIdentifier2(next4) && matches4(next4.next, TokenType.OPEN_PAREN)) {
+      Token afterParameters = skipFormalParameterList(next4.next);
+      if (afterParameters != null && (matchesAny(afterParameters, [TokenType.COMMA, TokenType.CLOSE_PAREN]))) {
+        return skipPastMatchingToken(startToken);
+      }
+    }
+    Token afterType = skipFinalConstVarOrType(next4);
+    if (afterType == null) {
+      return null;
+    }
+    if (skipSimpleIdentifier(afterType) == null) {
+      return null;
+    }
+    return skipPastMatchingToken(startToken);
+  }
+  /**
+   * If the given token is a begin token with an associated end token, then return the token
+   * following the end token. Otherwise, return {@code null}.
+   * @param startToken the token that is assumed to be a being token
+   * @return the token following the matching end token
+   */
+  Token skipPastMatchingToken(Token startToken) {
+    if (startToken is! BeginToken) {
+      return null;
+    }
+    Token closeParen = (startToken as BeginToken).endToken;
+    if (closeParen == null) {
+      return null;
+    }
+    return closeParen.next;
+  }
+  /**
+   * Parse a prefixed identifier, starting at the given token, without actually creating a prefixed
+   * identifier or changing the current token. Return the token following the prefixed identifier
+   * that was parsed, or {@code null} if the given token is not the first token in a valid prefixed
+   * identifier.
+   * <p>
+   * This method must be kept in sync with {@link #parsePrefixedIdentifier()}.
+   * <pre>
+   * prefixedIdentifier ::=
+   * identifier ('.' identifier)?
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the prefixed identifier that was parsed
+   */
+  Token skipPrefixedIdentifier(Token startToken) {
+    Token token = skipSimpleIdentifier(startToken);
+    if (token == null) {
+      return null;
+    } else if (!matches4(token, TokenType.PERIOD)) {
+      return token;
+    }
+    return skipSimpleIdentifier(token.next);
+  }
+  /**
+   * Parse a return type, starting at the given token, without actually creating a return type or
+   * changing the current token. Return the token following the return type that was parsed, or{@code null} if the given token is not the first token in a valid return type.
+   * <p>
+   * This method must be kept in sync with {@link #parseReturnType()}.
+   * <pre>
+   * returnType ::=
+   * 'void'
+   * | type
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the return type that was parsed
+   */
+  Token skipReturnType(Token startToken) {
+    if (matches3(startToken, Keyword.VOID)) {
+      return startToken.next;
+    } else {
+      return skipTypeName(startToken);
+    }
+  }
+  /**
+   * Parse a simple identifier, starting at the given token, without actually creating a simple
+   * identifier or changing the current token. Return the token following the simple identifier that
+   * was parsed, or {@code null} if the given token is not the first token in a valid simple
+   * identifier.
+   * <p>
+   * This method must be kept in sync with {@link #parseSimpleIdentifier()}.
+   * <pre>
+   * identifier ::=
+   * IDENTIFIER
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the simple identifier that was parsed
+   */
+  Token skipSimpleIdentifier(Token startToken) {
+    if (matches4(startToken, TokenType.IDENTIFIER) || (matches4(startToken, TokenType.KEYWORD) && (startToken as KeywordToken).keyword.isPseudoKeyword())) {
+      return startToken.next;
+    }
+    return null;
+  }
+  /**
+   * Parse a string literal that contains interpolations, starting at the given token, without
+   * actually creating a string literal or changing the current token. Return the token following
+   * the string literal that was parsed, or {@code null} if the given token is not the first token
+   * in a valid string literal.
+   * <p>
+   * This method must be kept in sync with {@link #parseStringInterpolation(Token)}.
+   * @param startToken the token at which parsing is to begin
+   * @return the string literal that was parsed
+   */
+  Token skipStringInterpolation(Token startToken) {
+    Token token = startToken;
+    TokenType type19 = token.type;
+    while (type19 == TokenType.STRING_INTERPOLATION_EXPRESSION || type19 == TokenType.STRING_INTERPOLATION_IDENTIFIER) {
+      if (type19 == TokenType.STRING_INTERPOLATION_EXPRESSION) {
+        token = token.next;
+        type19 = token.type;
+        int bracketNestingLevel = 1;
+        while (bracketNestingLevel > 0) {
+          if (type19 == TokenType.EOF) {
+            return null;
+          } else if (type19 == TokenType.OPEN_CURLY_BRACKET) {
+            bracketNestingLevel++;
+          } else if (type19 == TokenType.CLOSE_CURLY_BRACKET) {
+            bracketNestingLevel--;
+          } else if (type19 == TokenType.STRING) {
+            token = skipStringLiteral(token);
+            if (token == null) {
+              return null;
+            }
+          } else {
+            token = token.next;
+          }
+          type19 = token.type;
+        }
+        token = token.next;
+        type19 = token.type;
+      } else {
+        token = token.next;
+        if (token.type != TokenType.IDENTIFIER) {
+          return null;
+        }
+        token = token.next;
+      }
+      type19 = token.type;
+      if (type19 == TokenType.STRING) {
+        token = token.next;
+        type19 = token.type;
+      }
+    }
+    return token;
+  }
+  /**
+   * Parse a string literal, starting at the given token, without actually creating a string literal
+   * or changing the current token. Return the token following the string literal that was parsed,
+   * or {@code null} if the given token is not the first token in a valid string literal.
+   * <p>
+   * This method must be kept in sync with {@link #parseStringLiteral()}.
+   * <pre>
+   * stringLiteral ::=
+   * MULTI_LINE_STRING+
+   * | SINGLE_LINE_STRING+
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the string literal that was parsed
+   */
+  Token skipStringLiteral(Token startToken) {
+    Token token = startToken;
+    while (token != null && matches4(token, TokenType.STRING)) {
+      token = token.next;
+      TokenType type20 = token.type;
+      if (type20 == TokenType.STRING_INTERPOLATION_EXPRESSION || type20 == TokenType.STRING_INTERPOLATION_IDENTIFIER) {
+        token = skipStringInterpolation(token);
+      }
+    }
+    if (token == startToken) {
+      return null;
+    }
+    return token;
+  }
+  /**
+   * Parse a list of type arguments, starting at the given token, without actually creating a type argument list
+   * or changing the current token. Return the token following the type argument list that was parsed,
+   * or {@code null} if the given token is not the first token in a valid type argument list.
+   * <p>
+   * This method must be kept in sync with {@link #parseTypeArgumentList()}.
+   * <pre>
+   * typeArguments ::=
+   * '<' typeList '>'
+   * typeList ::=
+   * type (',' type)
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the type argument list that was parsed
+   */
+  Token skipTypeArgumentList(Token startToken) {
+    Token token = startToken;
+    if (!matches4(token, TokenType.LT)) {
+      return null;
+    }
+    token = skipTypeName(token.next);
+    if (token == null) {
+      return null;
+    }
+    while (matches4(token, TokenType.COMMA)) {
+      token = skipTypeName(token.next);
+      if (token == null) {
+        return null;
+      }
+    }
+    if (token.type == TokenType.GT) {
+      return token.next;
+    } else if (token.type == TokenType.GT_GT) {
+      Token second = new Token(TokenType.GT, token.offset + 1);
+      second.setNextWithoutSettingPrevious(token.next);
+      return second;
+    }
+    return null;
+  }
+  /**
+   * Parse a type name, starting at the given token, without actually creating a type name or
+   * changing the current token. Return the token following the type name that was parsed, or{@code null} if the given token is not the first token in a valid type name.
+   * <p>
+   * This method must be kept in sync with {@link #parseTypeName()}.
+   * <pre>
+   * type ::=
+   * qualified typeArguments?
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the type name that was parsed
+   */
+  Token skipTypeName(Token startToken) {
+    Token token = skipPrefixedIdentifier(startToken);
+    if (token == null) {
+      return null;
+    }
+    if (matches4(token, TokenType.LT)) {
+      token = skipTypeArgumentList(token);
+    }
+    return token;
+  }
+  /**
+   * Parse a list of type parameters, starting at the given token, without actually creating a type
+   * parameter list or changing the current token. Return the token following the type parameter
+   * list that was parsed, or {@code null} if the given token is not the first token in a valid type
+   * parameter list.
+   * <p>
+   * This method must be kept in sync with {@link #parseTypeParameterList()}.
+   * <pre>
+   * typeParameterList ::=
+   * '<' typeParameter (',' typeParameter)* '>'
+   * </pre>
+   * @param startToken the token at which parsing is to begin
+   * @return the token following the type parameter list that was parsed
+   */
+  Token skipTypeParameterList(Token startToken) {
+    if (!matches4(startToken, TokenType.LT)) {
+      return null;
+    }
+    int depth = 1;
+    Token next5 = startToken.next;
+    while (depth > 0) {
+      if (matches4(next5, TokenType.EOF)) {
+        return null;
+      } else if (matches4(next5, TokenType.LT)) {
+        depth++;
+      } else if (matches4(next5, TokenType.GT)) {
+        depth--;
+      } else if (matches4(next5, TokenType.GT_EQ)) {
+        if (depth == 1) {
+          Token fakeEquals = new Token(TokenType.EQ, next5.offset + 2);
+          fakeEquals.setNextWithoutSettingPrevious(next5.next);
+          return fakeEquals;
+        }
+        depth--;
+      } else if (matches4(next5, TokenType.GT_GT)) {
+        depth -= 2;
+      } else if (matches4(next5, TokenType.GT_GT_EQ)) {
+        if (depth < 2) {
+          return null;
+        } else if (depth == 2) {
+          Token fakeEquals = new Token(TokenType.EQ, next5.offset + 2);
+          fakeEquals.setNextWithoutSettingPrevious(next5.next);
+          return fakeEquals;
+        }
+        depth -= 2;
+      }
+      next5 = next5.next;
+    }
+    return next5;
+  }
+  /**
+   * Translate the characters at the given index in the given string, appending the translated
+   * character to the given builder. The index is assumed to be valid.
+   * @param builder the builder to which the translated character is to be appended
+   * @param lexeme the string containing the character(s) to be translated
+   * @param index the index of the character to be translated
+   * @return the index of the next character to be translated
+   */
+  int translateCharacter(StringBuffer builder, String lexeme, int index) {
+    int currentChar = lexeme.charCodeAt(index);
+    if (currentChar != 0x5c) {
+      builder.addCharCode(currentChar);
+      return index + 1;
+    }
+    int length8 = lexeme.length;
+    int currentIndex = index + 1;
+    if (currentIndex >= length8) {
+      return length8;
+    }
+    currentChar = lexeme.charCodeAt(currentIndex);
+    if (currentChar == 0x6e) {
+      builder.addCharCode(0xa);
+    } else if (currentChar == 0x72) {
+      builder.addCharCode(0xd);
+    } else if (currentChar == 0x66) {
+      builder.addCharCode(0xc);
+    } else if (currentChar == 0x62) {
+      builder.addCharCode(0x8);
+    } else if (currentChar == 0x74) {
+      builder.addCharCode(0x9);
+    } else if (currentChar == 0x76) {
+      builder.addCharCode(0xb);
+    } else if (currentChar == 0x78) {
+      if (currentIndex + 2 >= length8) {
+        reportError3(ParserErrorCode.INVALID_HEX_ESCAPE, []);
+        return length8;
+      }
+      int firstDigit = lexeme.charCodeAt(currentIndex + 1);
+      int secondDigit = lexeme.charCodeAt(currentIndex + 2);
+      if (!isHexDigit(firstDigit) || !isHexDigit(secondDigit)) {
+        reportError3(ParserErrorCode.INVALID_HEX_ESCAPE, []);
+      } else {
+        builder.addCharCode(((Character.digit(firstDigit, 16) << 4) + Character.digit(secondDigit, 16)) as int);
+      }
+      return currentIndex + 3;
+    } else if (currentChar == 0x75) {
+      currentIndex++;
+      if (currentIndex >= length8) {
+        reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+        return length8;
+      }
+      currentChar = lexeme.charCodeAt(currentIndex);
+      if (currentChar == 0x7b) {
+        currentIndex++;
+        if (currentIndex >= length8) {
+          reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+          return length8;
+        }
+        currentChar = lexeme.charCodeAt(currentIndex);
+        int digitCount = 0;
+        int value = 0;
+        while (currentChar != 0x7d) {
+          if (!isHexDigit(currentChar)) {
+            reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+            currentIndex++;
+            while (currentIndex < length8 && lexeme.charCodeAt(currentIndex) != 0x7d) {
+              currentIndex++;
+            }
+            return currentIndex + 1;
+          }
+          digitCount++;
+          value = (value << 4) + Character.digit(currentChar, 16);
+          currentIndex++;
+          if (currentIndex >= length8) {
+            reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+            return length8;
+          }
+          currentChar = lexeme.charCodeAt(currentIndex);
+        }
+        if (digitCount < 1 || digitCount > 6) {
+          reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+        }
+        appendScalarValue(builder, lexeme.substring(index, currentIndex + 1), value, index, currentIndex);
+        return currentIndex + 1;
+      } else {
+        if (currentIndex + 3 >= length8) {
+          reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+          return length8;
+        }
+        int firstDigit = currentChar;
+        int secondDigit = lexeme.charCodeAt(currentIndex + 1);
+        int thirdDigit = lexeme.charCodeAt(currentIndex + 2);
+        int fourthDigit = lexeme.charCodeAt(currentIndex + 3);
+        if (!isHexDigit(firstDigit) || !isHexDigit(secondDigit) || !isHexDigit(thirdDigit) || !isHexDigit(fourthDigit)) {
+          reportError3(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
+        } else {
+          appendScalarValue(builder, lexeme.substring(index, currentIndex + 1), ((((((Character.digit(firstDigit, 16) << 4) + Character.digit(secondDigit, 16)) << 4) + Character.digit(thirdDigit, 16)) << 4) + Character.digit(fourthDigit, 16)), index, currentIndex + 3);
+        }
+        return currentIndex + 4;
+      }
+    } else {
+      builder.addCharCode(currentChar);
+    }
+    return currentIndex + 1;
+  }
+  /**
+   * Validate that the given parameter list does not contain any field initializers.
+   * @param parameterList the parameter list to be validated
+   */
+  void validateFormalParameterList(FormalParameterList parameterList) {
+    for (FormalParameter parameter in parameterList.parameters) {
+      if (parameter is FieldFormalParameter) {
+        reportError(ParserErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR, (parameter as FieldFormalParameter).identifier, []);
+      }
+    }
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a class and return the 'abstract'
+   * keyword if there is one.
+   * @param modifiers the modifiers being validated
+   */
+  Token validateModifiersForClass(Modifiers modifiers) {
+    validateModifiersForTopLevelDeclaration(modifiers);
+    if (modifiers.constKeyword != null) {
+      reportError4(ParserErrorCode.CONST_CLASS, modifiers.constKeyword, []);
+    }
+    if (modifiers.externalKeyword != null) {
+      reportError4(ParserErrorCode.EXTERNAL_CLASS, modifiers.externalKeyword, []);
+    }
+    if (modifiers.finalKeyword != null) {
+      reportError4(ParserErrorCode.FINAL_CLASS, modifiers.finalKeyword, []);
+    }
+    if (modifiers.varKeyword != null) {
+      reportError4(ParserErrorCode.VAR_CLASS, modifiers.varKeyword, []);
+    }
+    return modifiers.abstractKeyword;
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a constructor and return the
+   * 'const' keyword if there is one.
+   * @param modifiers the modifiers being validated
+   * @return the 'const' or 'final' keyword associated with the constructor
+   */
+  Token validateModifiersForConstructor(Modifiers modifiers) {
+    if (modifiers.abstractKeyword != null) {
+      reportError3(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
+    }
+    if (modifiers.finalKeyword != null) {
+      reportError4(ParserErrorCode.FINAL_CONSTRUCTOR, modifiers.finalKeyword, []);
+    }
+    if (modifiers.staticKeyword != null) {
+      reportError4(ParserErrorCode.STATIC_CONSTRUCTOR, modifiers.staticKeyword, []);
+    }
+    if (modifiers.varKeyword != null) {
+      reportError4(ParserErrorCode.CONSTRUCTOR_WITH_RETURN_TYPE, modifiers.varKeyword, []);
+    }
+    Token externalKeyword6 = modifiers.externalKeyword;
+    Token constKeyword4 = modifiers.constKeyword;
+    Token factoryKeyword4 = modifiers.factoryKeyword;
+    if (externalKeyword6 != null && constKeyword4 != null && constKeyword4.offset < externalKeyword6.offset) {
+      reportError4(ParserErrorCode.EXTERNAL_AFTER_CONST, externalKeyword6, []);
+    }
+    if (externalKeyword6 != null && factoryKeyword4 != null && factoryKeyword4.offset < externalKeyword6.offset) {
+      reportError4(ParserErrorCode.EXTERNAL_AFTER_FACTORY, externalKeyword6, []);
+    }
+    return constKeyword4;
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a field and return the 'final',
+   * 'const' or 'var' keyword if there is one.
+   * @param modifiers the modifiers being validated
+   * @return the 'final', 'const' or 'var' keyword associated with the field
+   */
+  Token validateModifiersForField(Modifiers modifiers) {
+    if (modifiers.abstractKeyword != null) {
+      reportError3(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
+    }
+    if (modifiers.externalKeyword != null) {
+      reportError4(ParserErrorCode.EXTERNAL_FIELD, modifiers.externalKeyword, []);
+    }
+    if (modifiers.factoryKeyword != null) {
+      reportError4(ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword, []);
+    }
+    Token staticKeyword3 = modifiers.staticKeyword;
+    Token constKeyword5 = modifiers.constKeyword;
+    Token finalKeyword3 = modifiers.finalKeyword;
+    Token varKeyword3 = modifiers.varKeyword;
+    if (constKeyword5 != null) {
+      if (finalKeyword3 != null) {
+        reportError4(ParserErrorCode.CONST_AND_FINAL, finalKeyword3, []);
+      }
+      if (varKeyword3 != null) {
+        reportError4(ParserErrorCode.CONST_AND_VAR, varKeyword3, []);
+      }
+      if (staticKeyword3 != null && constKeyword5.offset < staticKeyword3.offset) {
+        reportError4(ParserErrorCode.STATIC_AFTER_CONST, staticKeyword3, []);
+      }
+    } else if (finalKeyword3 != null) {
+      if (varKeyword3 != null) {
+        reportError4(ParserErrorCode.FINAL_AND_VAR, varKeyword3, []);
+      }
+      if (staticKeyword3 != null && finalKeyword3.offset < staticKeyword3.offset) {
+        reportError4(ParserErrorCode.STATIC_AFTER_FINAL, staticKeyword3, []);
+      }
+    } else if (varKeyword3 != null && staticKeyword3 != null && varKeyword3.offset < staticKeyword3.offset) {
+      reportError4(ParserErrorCode.STATIC_AFTER_VAR, staticKeyword3, []);
+    }
+    return lexicallyFirst([constKeyword5, finalKeyword3, varKeyword3]);
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a getter, setter, or method.
+   * @param modifiers the modifiers being validated
+   */
+  void validateModifiersForGetterOrSetterOrMethod(Modifiers modifiers) {
+    if (modifiers.abstractKeyword != null) {
+      reportError3(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
+    }
+    if (modifiers.constKeyword != null) {
+      reportError4(ParserErrorCode.CONST_METHOD, modifiers.constKeyword, []);
+    }
+    if (modifiers.factoryKeyword != null) {
+      reportError4(ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword, []);
+    }
+    if (modifiers.finalKeyword != null) {
+      reportError4(ParserErrorCode.FINAL_METHOD, modifiers.finalKeyword, []);
+    }
+    if (modifiers.varKeyword != null) {
+      reportError4(ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword, []);
+    }
+    Token externalKeyword7 = modifiers.externalKeyword;
+    Token staticKeyword4 = modifiers.staticKeyword;
+    if (externalKeyword7 != null && staticKeyword4 != null && staticKeyword4.offset < externalKeyword7.offset) {
+      reportError4(ParserErrorCode.EXTERNAL_AFTER_STATIC, externalKeyword7, []);
+    }
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a getter, setter, or method.
+   * @param modifiers the modifiers being validated
+   */
+  void validateModifiersForOperator(Modifiers modifiers) {
+    if (modifiers.abstractKeyword != null) {
+      reportError3(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
+    }
+    if (modifiers.constKeyword != null) {
+      reportError4(ParserErrorCode.CONST_METHOD, modifiers.constKeyword, []);
+    }
+    if (modifiers.factoryKeyword != null) {
+      reportError4(ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword, []);
+    }
+    if (modifiers.finalKeyword != null) {
+      reportError4(ParserErrorCode.FINAL_METHOD, modifiers.finalKeyword, []);
+    }
+    if (modifiers.staticKeyword != null) {
+      reportError4(ParserErrorCode.STATIC_OPERATOR, modifiers.staticKeyword, []);
+    }
+    if (modifiers.varKeyword != null) {
+      reportError4(ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword, []);
+    }
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a top-level declaration.
+   * @param modifiers the modifiers being validated
+   */
+  void validateModifiersForTopLevelDeclaration(Modifiers modifiers) {
+    if (modifiers.factoryKeyword != null) {
+      reportError4(ParserErrorCode.FACTORY_TOP_LEVEL_DECLARATION, modifiers.factoryKeyword, []);
+    }
+    if (modifiers.staticKeyword != null) {
+      reportError4(ParserErrorCode.STATIC_TOP_LEVEL_DECLARATION, modifiers.staticKeyword, []);
+    }
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a top-level function.
+   * @param modifiers the modifiers being validated
+   */
+  void validateModifiersForTopLevelFunction(Modifiers modifiers) {
+    validateModifiersForTopLevelDeclaration(modifiers);
+    if (modifiers.abstractKeyword != null) {
+      reportError3(ParserErrorCode.ABSTRACT_TOP_LEVEL_FUNCTION, []);
+    }
+    if (modifiers.constKeyword != null) {
+      reportError4(ParserErrorCode.CONST_CLASS, modifiers.constKeyword, []);
+    }
+    if (modifiers.finalKeyword != null) {
+      reportError4(ParserErrorCode.FINAL_CLASS, modifiers.finalKeyword, []);
+    }
+    if (modifiers.varKeyword != null) {
+      reportError4(ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword, []);
+    }
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a field and return the 'final',
+   * 'const' or 'var' keyword if there is one.
+   * @param modifiers the modifiers being validated
+   * @return the 'final', 'const' or 'var' keyword associated with the field
+   */
+  Token validateModifiersForTopLevelVariable(Modifiers modifiers) {
+    validateModifiersForTopLevelDeclaration(modifiers);
+    if (modifiers.abstractKeyword != null) {
+      reportError3(ParserErrorCode.ABSTRACT_TOP_LEVEL_VARIABLE, []);
+    }
+    if (modifiers.externalKeyword != null) {
+      reportError4(ParserErrorCode.EXTERNAL_FIELD, modifiers.externalKeyword, []);
+    }
+    Token constKeyword6 = modifiers.constKeyword;
+    Token finalKeyword4 = modifiers.finalKeyword;
+    Token varKeyword4 = modifiers.varKeyword;
+    if (constKeyword6 != null) {
+      if (finalKeyword4 != null) {
+        reportError4(ParserErrorCode.CONST_AND_FINAL, finalKeyword4, []);
+      }
+      if (varKeyword4 != null) {
+        reportError4(ParserErrorCode.CONST_AND_VAR, varKeyword4, []);
+      }
+    } else if (finalKeyword4 != null) {
+      if (varKeyword4 != null) {
+        reportError4(ParserErrorCode.FINAL_AND_VAR, varKeyword4, []);
+      }
+    }
+    return lexicallyFirst([constKeyword6, finalKeyword4, varKeyword4]);
+  }
+  /**
+   * Validate that the given set of modifiers is appropriate for a class and return the 'abstract'
+   * keyword if there is one.
+   * @param modifiers the modifiers being validated
+   */
+  void validateModifiersForTypedef(Modifiers modifiers) {
+    validateModifiersForTopLevelDeclaration(modifiers);
+    if (modifiers.abstractKeyword != null) {
+      reportError4(ParserErrorCode.ABSTRACT_TYPEDEF, modifiers.abstractKeyword, []);
+    }
+    if (modifiers.constKeyword != null) {
+      reportError4(ParserErrorCode.CONST_TYPEDEF, modifiers.constKeyword, []);
+    }
+    if (modifiers.externalKeyword != null) {
+      reportError4(ParserErrorCode.EXTERNAL_TYPEDEF, modifiers.externalKeyword, []);
+    }
+    if (modifiers.finalKeyword != null) {
+      reportError4(ParserErrorCode.FINAL_TYPEDEF, modifiers.finalKeyword, []);
+    }
+    if (modifiers.varKeyword != null) {
+      reportError4(ParserErrorCode.VAR_TYPEDEF, modifiers.varKeyword, []);
+    }
+  }
+}
+class AnalysisErrorListener_1 implements AnalysisErrorListener {
+  List<bool> errorFound;
+  AnalysisErrorListener_1(this.errorFound);
+  void onError(AnalysisError error) {
+    errorFound[0] = true;
+  }
+}
+/**
+ * The enumeration {@code ParserErrorCode} defines the error codes used for errors detected by the
+ * parser. The convention for this class is for the name of the error code to indicate the problem
+ * that caused the error to be generated and for the error message to explain what is wrong and,
+ * when appropriate, how the problem can be corrected.
+ */
+class ParserErrorCode implements ErrorCode {
+  static final ParserErrorCode ABSTRACT_CLASS_MEMBER = new ParserErrorCode.con2('ABSTRACT_CLASS_MEMBER', 0, "Members of classes cannot be declared to be 'abstract'");
+  static final ParserErrorCode ABSTRACT_STATIC_METHOD = new ParserErrorCode.con2('ABSTRACT_STATIC_METHOD', 1, "Static methods cannot be declared to be 'abstract'");
+  static final ParserErrorCode ABSTRACT_TOP_LEVEL_FUNCTION = new ParserErrorCode.con2('ABSTRACT_TOP_LEVEL_FUNCTION', 2, "Top-level functions cannot be declared to be 'abstract'");
+  static final ParserErrorCode ABSTRACT_TOP_LEVEL_VARIABLE = new ParserErrorCode.con2('ABSTRACT_TOP_LEVEL_VARIABLE', 3, "Top-level variables cannot be declared to be 'abstract'");
+  static final ParserErrorCode ABSTRACT_TYPEDEF = new ParserErrorCode.con2('ABSTRACT_TYPEDEF', 4, "Type aliases cannot be declared to be 'abstract'");
+  static final ParserErrorCode BREAK_OUTSIDE_OF_LOOP = new ParserErrorCode.con2('BREAK_OUTSIDE_OF_LOOP', 5, "A break statement cannot be used outside of a loop or switch statement");
+  static final ParserErrorCode BUILT_IN_IDENTIFIER_AS_TYPE_NAME = new ParserErrorCode.con2('BUILT_IN_IDENTIFIER_AS_TYPE_NAME', 6, "The built-in identifier '%s' cannot be used as a type name");
+  static final ParserErrorCode BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME = new ParserErrorCode.con2('BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME', 7, "The built-in identifier '%s' cannot be used as a type alias name");
+  static final ParserErrorCode BUILT_IN_IDENTIFIER_AS_TYPE_VARIABLE_NAME = new ParserErrorCode.con2('BUILT_IN_IDENTIFIER_AS_TYPE_VARIABLE_NAME', 8, "The built-in identifier '%s' cannot be used as a type variable name");
+  static final ParserErrorCode CONST_AND_FINAL = new ParserErrorCode.con2('CONST_AND_FINAL', 9, "Members cannot be declared to be both 'const' and 'final'");
+  static final ParserErrorCode CONST_AND_VAR = new ParserErrorCode.con2('CONST_AND_VAR', 10, "Members cannot be declared to be both 'const' and 'var'");
+  static final ParserErrorCode CONST_CLASS = new ParserErrorCode.con2('CONST_CLASS', 11, "Classes cannot be declared to be 'const'");
+  static final ParserErrorCode CONST_METHOD = new ParserErrorCode.con2('CONST_METHOD', 12, "Getters, setters and methods cannot be declared to be 'const'");
+  static final ParserErrorCode CONST_TYPEDEF = new ParserErrorCode.con2('CONST_TYPEDEF', 13, "Type aliases cannot be declared to be 'const'");
+  static final ParserErrorCode CONSTRUCTOR_WITH_RETURN_TYPE = new ParserErrorCode.con2('CONSTRUCTOR_WITH_RETURN_TYPE', 14, "Constructors cannot have a return type");
+  static final ParserErrorCode CONTINUE_OUTSIDE_OF_LOOP = new ParserErrorCode.con2('CONTINUE_OUTSIDE_OF_LOOP', 15, "A continue statement cannot be used outside of a loop or switch statement");
+  static final ParserErrorCode CONTINUE_WITHOUT_LABEL_IN_CASE = new ParserErrorCode.con2('CONTINUE_WITHOUT_LABEL_IN_CASE', 16, "A continue statement in a switch statement must have a label as a target");
+  static final ParserErrorCode DIRECTIVE_AFTER_DECLARATION = new ParserErrorCode.con2('DIRECTIVE_AFTER_DECLARATION', 17, "Directives must appear before any declarations");
+  static final ParserErrorCode DUPLICATE_LABEL_IN_SWITCH_STATEMENT = new ParserErrorCode.con2('DUPLICATE_LABEL_IN_SWITCH_STATEMENT', 18, "The label %s was already used in this switch statement");
+  static final ParserErrorCode DUPLICATED_MODIFIER = new ParserErrorCode.con2('DUPLICATED_MODIFIER', 19, "The modifier '%s' was already specified.");
+  static final ParserErrorCode EXPECTED_CASE_OR_DEFAULT = new ParserErrorCode.con2('EXPECTED_CASE_OR_DEFAULT', 20, "Expected 'case' or 'default'");
+  static final ParserErrorCode EXPECTED_LIST_OR_MAP_LITERAL = new ParserErrorCode.con2('EXPECTED_LIST_OR_MAP_LITERAL', 21, "Expected a list or map literal");
+  static final ParserErrorCode EXPECTED_STRING_LITERAL = new ParserErrorCode.con2('EXPECTED_STRING_LITERAL', 22, "Expected a string literal");
+  static final ParserErrorCode EXPECTED_TOKEN = new ParserErrorCode.con2('EXPECTED_TOKEN', 23, "Expected to find: %s");
+  static final ParserErrorCode EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE = new ParserErrorCode.con2('EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE', 24, "Export directives must preceed part directives");
+  static final ParserErrorCode EXTERNAL_AFTER_CONST = new ParserErrorCode.con2('EXTERNAL_AFTER_CONST', 25, "The modifier 'external' should be before the modifier 'const'");
+  static final ParserErrorCode EXTERNAL_AFTER_FACTORY = new ParserErrorCode.con2('EXTERNAL_AFTER_FACTORY', 26, "The modifier 'external' should be before the modifier 'factory'");
+  static final ParserErrorCode EXTERNAL_AFTER_STATIC = new ParserErrorCode.con2('EXTERNAL_AFTER_STATIC', 27, "The modifier 'external' should be before the modifier 'static'");
+  static final ParserErrorCode EXTERNAL_CLASS = new ParserErrorCode.con2('EXTERNAL_CLASS', 28, "Classes cannot be declared to be 'external'");
+  static final ParserErrorCode EXTERNAL_CONSTRUCTOR_WITH_BODY = new ParserErrorCode.con2('EXTERNAL_CONSTRUCTOR_WITH_BODY', 29, "External constructors cannot have a body");
+  static final ParserErrorCode EXTERNAL_FIELD = new ParserErrorCode.con2('EXTERNAL_FIELD', 30, "Fields cannot be declared to be 'external'");
+  static final ParserErrorCode EXTERNAL_GETTER_WITH_BODY = new ParserErrorCode.con2('EXTERNAL_GETTER_WITH_BODY', 31, "External getters cannot have a body");
+  static final ParserErrorCode EXTERNAL_METHOD_WITH_BODY = new ParserErrorCode.con2('EXTERNAL_METHOD_WITH_BODY', 32, "External methods cannot have a body");
+  static final ParserErrorCode EXTERNAL_OPERATOR_WITH_BODY = new ParserErrorCode.con2('EXTERNAL_OPERATOR_WITH_BODY', 33, "External operators cannot have a body");
+  static final ParserErrorCode EXTERNAL_SETTER_WITH_BODY = new ParserErrorCode.con2('EXTERNAL_SETTER_WITH_BODY', 34, "External setters cannot have a body");
+  static final ParserErrorCode EXTERNAL_TYPEDEF = new ParserErrorCode.con2('EXTERNAL_TYPEDEF', 35, "Type aliases cannot be declared to be 'external'");
+  static final ParserErrorCode FACTORY_TOP_LEVEL_DECLARATION = new ParserErrorCode.con2('FACTORY_TOP_LEVEL_DECLARATION', 36, "Top-level declarations cannot be declared to be 'factory'");
+  static final ParserErrorCode FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR = new ParserErrorCode.con2('FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR', 37, "Field initializers can only be used in a constructor");
+  static final ParserErrorCode FINAL_AND_VAR = new ParserErrorCode.con2('FINAL_AND_VAR', 38, "Members cannot be declared to be both 'final' and 'var'");
+  static final ParserErrorCode FINAL_CLASS = new ParserErrorCode.con2('FINAL_CLASS', 39, "Classes cannot be declared to be 'final'");
+  static final ParserErrorCode FINAL_CONSTRUCTOR = new ParserErrorCode.con2('FINAL_CONSTRUCTOR', 40, "A constructor cannot be declared to be 'final'");
+  static final ParserErrorCode FINAL_METHOD = new ParserErrorCode.con2('FINAL_METHOD', 41, "Getters, setters and methods cannot be declared to be 'final'");
+  static final ParserErrorCode FINAL_TYPEDEF = new ParserErrorCode.con2('FINAL_TYPEDEF', 42, "Type aliases cannot be declared to be 'final'");
+  static final ParserErrorCode GETTER_WITH_PARAMETERS = new ParserErrorCode.con2('GETTER_WITH_PARAMETERS', 43, "Getter should be declared without a parameter list");
+  static final ParserErrorCode ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE = new ParserErrorCode.con2('ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE', 44, "Illegal assignment to non-assignable expression");
+  static final ParserErrorCode IMPLEMENTS_BEFORE_EXTENDS = new ParserErrorCode.con2('IMPLEMENTS_BEFORE_EXTENDS', 45, "The extends clause must be before the implements clause");
+  static final ParserErrorCode IMPLEMENTS_BEFORE_WITH = new ParserErrorCode.con2('IMPLEMENTS_BEFORE_WITH', 46, "The with clause must be before the implements clause");
+  static final ParserErrorCode IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE = new ParserErrorCode.con2('IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE', 47, "Import directives must preceed part directives");
+  static final ParserErrorCode INITIALIZED_VARIABLE_IN_FOR_EACH = new ParserErrorCode.con2('INITIALIZED_VARIABLE_IN_FOR_EACH', 48, "The loop variable in a for-each loop cannot be initialized");
+  static final ParserErrorCode INVALID_CODE_POINT = new ParserErrorCode.con2('INVALID_CODE_POINT', 49, "The escape sequence '%s' is not a valid code point");
+  static final ParserErrorCode INVALID_COMMENT_REFERENCE = new ParserErrorCode.con2('INVALID_COMMENT_REFERENCE', 50, "Comment references should contain a possibly prefixed identifier and can start with 'new', but should not contain anything else");
+  static final ParserErrorCode INVALID_HEX_ESCAPE = new ParserErrorCode.con2('INVALID_HEX_ESCAPE', 51, "An escape sequence starting with '\\x' must be followed by 2 hexidecimal digits");
+  static final ParserErrorCode INVALID_OPERATOR_FOR_SUPER = new ParserErrorCode.con2('INVALID_OPERATOR_FOR_SUPER', 52, "The operator '%s' cannot be used with 'super'");
+  static final ParserErrorCode INVALID_UNICODE_ESCAPE = new ParserErrorCode.con2('INVALID_UNICODE_ESCAPE', 53, "An escape sequence starting with '\\u' must be followed by 4 hexidecimal digits or from 1 to 6 digits between '{' and '}'");
+  static final ParserErrorCode LIBRARY_DIRECTIVE_NOT_FIRST = new ParserErrorCode.con2('LIBRARY_DIRECTIVE_NOT_FIRST', 54, "The library directive must appear before all other directives");
+  static final ParserErrorCode MISSING_ASSIGNABLE_SELECTOR = new ParserErrorCode.con2('MISSING_ASSIGNABLE_SELECTOR', 55, "Missing selector such as \".<identifier>\" or \"[0]\"");
+  static final ParserErrorCode MISSING_CATCH_OR_FINALLY = new ParserErrorCode.con2('MISSING_CATCH_OR_FINALLY', 56, "A try statement must have either a catch or finally clause");
+  static final ParserErrorCode MISSING_CLASS_BODY = new ParserErrorCode.con2('MISSING_CLASS_BODY', 57, "A class definition must have a body, even if it is empty");
+  static final ParserErrorCode MISSING_CONST_FINAL_VAR_OR_TYPE = new ParserErrorCode.con2('MISSING_CONST_FINAL_VAR_OR_TYPE', 58, "Variables must be declared using the keywords 'const', 'final', 'var' or a type name");
+  static final ParserErrorCode MISSING_FUNCTION_BODY = new ParserErrorCode.con2('MISSING_FUNCTION_BODY', 59, "A function body must be provided");
+  static final ParserErrorCode MISSING_FUNCTION_PARAMETERS = new ParserErrorCode.con2('MISSING_FUNCTION_PARAMETERS', 60, "Functions must have an explicit list of parameters");
+  static final ParserErrorCode MISSING_IDENTIFIER = new ParserErrorCode.con2('MISSING_IDENTIFIER', 61, "Expected an identifier");
+  static final ParserErrorCode MISSING_NAME_IN_LIBRARY_DIRECTIVE = new ParserErrorCode.con2('MISSING_NAME_IN_LIBRARY_DIRECTIVE', 62, "Library directives must include a library name");
+  static final ParserErrorCode MISSING_NAME_IN_PART_OF_DIRECTIVE = new ParserErrorCode.con2('MISSING_NAME_IN_PART_OF_DIRECTIVE', 63, "Library directives must include a library name");
+  static final ParserErrorCode MISSING_TYPEDEF_PARAMETERS = new ParserErrorCode.con2('MISSING_TYPEDEF_PARAMETERS', 64, "Type aliases for functions must have an explicit list of parameters");
+  static final ParserErrorCode MISSING_VARIABLE_IN_FOR_EACH = new ParserErrorCode.con2('MISSING_VARIABLE_IN_FOR_EACH', 65, "A loop variable must be declared in a for-each loop before the 'in', but none were found");
+  static final ParserErrorCode MIXED_PARAMETER_GROUPS = new ParserErrorCode.con2('MIXED_PARAMETER_GROUPS', 66, "Cannot have both positional and named parameters in a single parameter list");
+  static final ParserErrorCode MULTIPLE_EXTENDS_CLAUSES = new ParserErrorCode.con2('MULTIPLE_EXTENDS_CLAUSES', 67, "Each class definition can have at most one extends clause");
+  static final ParserErrorCode MULTIPLE_IMPLEMENTS_CLAUSES = new ParserErrorCode.con2('MULTIPLE_IMPLEMENTS_CLAUSES', 68, "Each class definition can have at most one implements clause");
+  static final ParserErrorCode MULTIPLE_LIBRARY_DIRECTIVES = new ParserErrorCode.con2('MULTIPLE_LIBRARY_DIRECTIVES', 69, "Only one library directive may be declared in a file");
+  static final ParserErrorCode MULTIPLE_NAMED_PARAMETER_GROUPS = new ParserErrorCode.con2('MULTIPLE_NAMED_PARAMETER_GROUPS', 70, "Cannot have multiple groups of named parameters in a single parameter list");
+  static final ParserErrorCode MULTIPLE_PART_OF_DIRECTIVES = new ParserErrorCode.con2('MULTIPLE_PART_OF_DIRECTIVES', 71, "Only one part-of directive may be declared in a file");
+  static final ParserErrorCode MULTIPLE_POSITIONAL_PARAMETER_GROUPS = new ParserErrorCode.con2('MULTIPLE_POSITIONAL_PARAMETER_GROUPS', 72, "Cannot have multiple groups of positional parameters in a single parameter list");
+  static final ParserErrorCode MULTIPLE_VARIABLES_IN_FOR_EACH = new ParserErrorCode.con2('MULTIPLE_VARIABLES_IN_FOR_EACH', 73, "A single loop variable must be declared in a for-each loop before the 'in', but %s were found");
+  static final ParserErrorCode MULTIPLE_WITH_CLAUSES = new ParserErrorCode.con2('MULTIPLE_WITH_CLAUSES', 74, "Each class definition can have at most one with clause");
+  static final ParserErrorCode NAMED_PARAMETER_OUTSIDE_GROUP = new ParserErrorCode.con2('NAMED_PARAMETER_OUTSIDE_GROUP', 75, "Named parameters must be enclosed in curly braces ('{' and '}')");
+  static final ParserErrorCode NON_CONSTRUCTOR_FACTORY = new ParserErrorCode.con2('NON_CONSTRUCTOR_FACTORY', 76, "Only constructors can be declared to be a 'factory'");
+  static final ParserErrorCode NON_IDENTIFIER_LIBRARY_NAME = new ParserErrorCode.con2('NON_IDENTIFIER_LIBRARY_NAME', 77, "The name of a library must be an identifier");
+  static final ParserErrorCode NON_PART_OF_DIRECTIVE_IN_PART = new ParserErrorCode.con2('NON_PART_OF_DIRECTIVE_IN_PART', 78, "The part-of directive must be the only directive in a part");
+  static final ParserErrorCode NON_USER_DEFINABLE_OPERATOR = new ParserErrorCode.con2('NON_USER_DEFINABLE_OPERATOR', 79, "The operator '%s' is not user definable");
+  static final ParserErrorCode POSITIONAL_AFTER_NAMED_ARGUMENT = new ParserErrorCode.con2('POSITIONAL_AFTER_NAMED_ARGUMENT', 80, "Positional arguments must occur before named arguments");
+  static final ParserErrorCode POSITIONAL_PARAMETER_OUTSIDE_GROUP = new ParserErrorCode.con2('POSITIONAL_PARAMETER_OUTSIDE_GROUP', 81, "Positional parameters must be enclosed in square brackets ('[' and ']')");
+  static final ParserErrorCode STATIC_AFTER_CONST = new ParserErrorCode.con2('STATIC_AFTER_CONST', 82, "The modifier 'static' should be before the modifier 'const'");
+  static final ParserErrorCode STATIC_AFTER_FINAL = new ParserErrorCode.con2('STATIC_AFTER_FINAL', 83, "The modifier 'static' should be before the modifier 'final'");
+  static final ParserErrorCode STATIC_AFTER_VAR = new ParserErrorCode.con2('STATIC_AFTER_VAR', 84, "The modifier 'static' should be before the modifier 'var'");
+  static final ParserErrorCode STATIC_CONSTRUCTOR = new ParserErrorCode.con2('STATIC_CONSTRUCTOR', 85, "Constructors cannot be static");
+  static final ParserErrorCode STATIC_OPERATOR = new ParserErrorCode.con2('STATIC_OPERATOR', 86, "Operators cannot be static");
+  static final ParserErrorCode STATIC_TOP_LEVEL_DECLARATION = new ParserErrorCode.con2('STATIC_TOP_LEVEL_DECLARATION', 87, "Top-level declarations cannot be declared to be 'static'");
+  static final ParserErrorCode UNEXPECTED_TOKEN = new ParserErrorCode.con2('UNEXPECTED_TOKEN', 88, "Unexpected token '%s'");
+  static final ParserErrorCode USE_OF_UNARY_PLUS_OPERATOR = new ParserErrorCode.con2('USE_OF_UNARY_PLUS_OPERATOR', 89, "There is no unary plus operator in Dart");
+  static final ParserErrorCode WITH_BEFORE_EXTENDS = new ParserErrorCode.con2('WITH_BEFORE_EXTENDS', 90, "The extends clause must be before the with clause");
+  static final ParserErrorCode WITH_WITHOUT_EXTENDS = new ParserErrorCode.con2('WITH_WITHOUT_EXTENDS', 91, "The with clause cannot be used without an extends clause");
+  static final ParserErrorCode WRONG_SEPARATOR_FOR_NAMED_PARAMETER = new ParserErrorCode.con2('WRONG_SEPARATOR_FOR_NAMED_PARAMETER', 92, "The default value of a named parameter should be preceeded by ':'");
+  static final ParserErrorCode WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER = new ParserErrorCode.con2('WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER', 93, "The default value of a positional parameter should be preceeded by '='");
+  static final ParserErrorCode VAR_CLASS = new ParserErrorCode.con2('VAR_CLASS', 94, "Classes cannot be declared to be 'var'");
+  static final ParserErrorCode VAR_RETURN_TYPE = new ParserErrorCode.con2('VAR_RETURN_TYPE', 95, "The return type cannot be 'var'");
+  static final ParserErrorCode VAR_TYPEDEF = new ParserErrorCode.con2('VAR_TYPEDEF', 96, "Type aliases cannot be declared to be 'var'");
+  static final ParserErrorCode VOID_PARAMETER = new ParserErrorCode.con2('VOID_PARAMETER', 97, "Parameters cannot have a type of 'void'");
+  static final ParserErrorCode VOID_VARIABLE = new ParserErrorCode.con2('VOID_VARIABLE', 98, "Variables cannot have a type of 'void'");
+  static final List<ParserErrorCode> values = [ABSTRACT_CLASS_MEMBER, ABSTRACT_STATIC_METHOD, ABSTRACT_TOP_LEVEL_FUNCTION, ABSTRACT_TOP_LEVEL_VARIABLE, ABSTRACT_TYPEDEF, BREAK_OUTSIDE_OF_LOOP, BUILT_IN_IDENTIFIER_AS_TYPE_NAME, BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME, BUILT_IN_IDENTIFIER_AS_TYPE_VARIABLE_NAME, CONST_AND_FINAL, CONST_AND_VAR, CONST_CLASS, CONST_METHOD, CONST_TYPEDEF, CONSTRUCTOR_WITH_RETURN_TYPE, CONTINUE_OUTSIDE_OF_LOOP, CONTINUE_WITHOUT_LABEL_IN_CASE, DIRECTIVE_AFTER_DECLARATION, DUPLICATE_LABEL_IN_SWITCH_STATEMENT, DUPLICATED_MODIFIER, EXPECTED_CASE_OR_DEFAULT, EXPECTED_LIST_OR_MAP_LITERAL, EXPECTED_STRING_LITERAL, EXPECTED_TOKEN, EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE, EXTERNAL_AFTER_CONST, EXTERNAL_AFTER_FACTORY, EXTERNAL_AFTER_STATIC, EXTERNAL_CLASS, EXTERNAL_CONSTRUCTOR_WITH_BODY, EXTERNAL_FIELD, EXTERNAL_GETTER_WITH_BODY, EXTERNAL_METHOD_WITH_BODY, EXTERNAL_OPERATOR_WITH_BODY, EXTERNAL_SETTER_WITH_BODY, EXTERNAL_TYPEDEF, FACTORY_TOP_LEVEL_DECLARATION, FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR, FINAL_AND_VAR, FINAL_CLASS, FINAL_CONSTRUCTOR, FINAL_METHOD, FINAL_TYPEDEF, GETTER_WITH_PARAMETERS, ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE, IMPLEMENTS_BEFORE_EXTENDS, IMPLEMENTS_BEFORE_WITH, IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE, INITIALIZED_VARIABLE_IN_FOR_EACH, INVALID_CODE_POINT, INVALID_COMMENT_REFERENCE, INVALID_HEX_ESCAPE, INVALID_OPERATOR_FOR_SUPER, INVALID_UNICODE_ESCAPE, LIBRARY_DIRECTIVE_NOT_FIRST, MISSING_ASSIGNABLE_SELECTOR, MISSING_CATCH_OR_FINALLY, MISSING_CLASS_BODY, MISSING_CONST_FINAL_VAR_OR_TYPE, MISSING_FUNCTION_BODY, MISSING_FUNCTION_PARAMETERS, MISSING_IDENTIFIER, MISSING_NAME_IN_LIBRARY_DIRECTIVE, MISSING_NAME_IN_PART_OF_DIRECTIVE, MISSING_TYPEDEF_PARAMETERS, MISSING_VARIABLE_IN_FOR_EACH, MIXED_PARAMETER_GROUPS, MULTIPLE_EXTENDS_CLAUSES, MULTIPLE_IMPLEMENTS_CLAUSES, MULTIPLE_LIBRARY_DIRECTIVES, MULTIPLE_NAMED_PARAMETER_GROUPS, MULTIPLE_PART_OF_DIRECTIVES, MULTIPLE_POSITIONAL_PARAMETER_GROUPS, MULTIPLE_VARIABLES_IN_FOR_EACH, MULTIPLE_WITH_CLAUSES, NAMED_PARAMETER_OUTSIDE_GROUP, NON_CONSTRUCTOR_FACTORY, NON_IDENTIFIER_LIBRARY_NAME, NON_PART_OF_DIRECTIVE_IN_PART, NON_USER_DEFINABLE_OPERATOR, POSITIONAL_AFTER_NAMED_ARGUMENT, POSITIONAL_PARAMETER_OUTSIDE_GROUP, STATIC_AFTER_CONST, STATIC_AFTER_FINAL, STATIC_AFTER_VAR, STATIC_CONSTRUCTOR, STATIC_OPERATOR, STATIC_TOP_LEVEL_DECLARATION, UNEXPECTED_TOKEN, USE_OF_UNARY_PLUS_OPERATOR, WITH_BEFORE_EXTENDS, WITH_WITHOUT_EXTENDS, WRONG_SEPARATOR_FOR_NAMED_PARAMETER, WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER, VAR_CLASS, VAR_RETURN_TYPE, VAR_TYPEDEF, VOID_PARAMETER, VOID_VARIABLE];
+  String __name;
+  int __ordinal = 0;
+  /**
+   * The severity of this error.
+   */
+  ErrorSeverity _severity;
+  /**
+   * The message template used to create the message to be displayed for this error.
+   */
+  String _message;
+  /**
+   * Initialize a newly created error code to have the given severity and message.
+   * @param severity the severity of the error
+   * @param message the message template used to create the message to be displayed for the error
+   */
+  ParserErrorCode.con1(String ___name, int ___ordinal, ErrorSeverity severity, String message) {
+    _jtd_constructor_208_impl(___name, ___ordinal, severity, message);
+  }
+  _jtd_constructor_208_impl(String ___name, int ___ordinal, ErrorSeverity severity, String message) {
+    __name = ___name;
+    __ordinal = ___ordinal;
+    this._severity = severity;
+    this._message = message;
+  }
+  /**
+   * Initialize a newly created error code to have the given message and a severity of ERROR.
+   * @param message the message template used to create the message to be displayed for the error
+   */
+  ParserErrorCode.con2(String ___name, int ___ordinal, String message) {
+    _jtd_constructor_209_impl(___name, ___ordinal, message);
+  }
+  _jtd_constructor_209_impl(String ___name, int ___ordinal, String message) {
+    _jtd_constructor_208_impl(___name, ___ordinal, ErrorSeverity.ERROR, message);
+  }
+  ErrorSeverity get errorSeverity => _severity;
+  String get message => _message;
+  ErrorType get type => ErrorType.SYNTACTIC_ERROR;
+  bool needsRecompilation() => true;
+  String toString() => __name;
+}
+/**
+ * Instances of the class {link ToFormattedSourceVisitor} write a source representation of a visited
+ * AST node (and all of it's children) to a writer.
+ */
+class ToFormattedSourceVisitor implements ASTVisitor<Object> {
+  /**
+   * The writer to which the source is to be written.
+   */
+  PrintWriter _writer;
+  int _indentLevel = 0;
+  String _indentString = "";
+  /**
+   * Initialize a newly created visitor to write source code representing the visited nodes to the
+   * given writer.
+   * @param writer the writer to which the source is to be written
+   */
+  ToFormattedSourceVisitor(PrintWriter writer) {
+    this._writer = writer;
+  }
+  Object visitAdjacentStrings(AdjacentStrings node) {
+    visitList5(node.strings, " ");
+    return null;
+  }
+  Object visitAnnotation(Annotation node) {
+    _writer.print('@');
+    visit(node.name);
+    visit7(".", node.constructorName);
+    visit(node.arguments);
+    return null;
+  }
+  Object visitArgumentDefinitionTest(ArgumentDefinitionTest node) {
+    _writer.print('?');
+    visit(node.identifier);
+    return null;
+  }
+  Object visitArgumentList(ArgumentList node) {
+    _writer.print('(');
+    visitList5(node.arguments, ", ");
+    _writer.print(')');
+    return null;
+  }
+  Object visitAsExpression(AsExpression node) {
+    visit(node.expression);
+    _writer.print(" as ");
+    visit(node.type);
+    return null;
+  }
+  Object visitAssertStatement(AssertStatement node) {
+    _writer.print("assert(");
+    visit(node.condition);
+    _writer.print(");");
+    return null;
+  }
+  Object visitAssignmentExpression(AssignmentExpression node) {
+    visit(node.leftHandSide);
+    _writer.print(' ');
+    _writer.print(node.operator.lexeme);
+    _writer.print(' ');
+    visit(node.rightHandSide);
+    return null;
+  }
+  Object visitBinaryExpression(BinaryExpression node) {
+    visit(node.leftOperand);
+    _writer.print(' ');
+    _writer.print(node.operator.lexeme);
+    _writer.print(' ');
+    visit(node.rightOperand);
+    return null;
+  }
+  Object visitBlock(Block node) {
+    _writer.print('{');
+    {
+      indentInc();
+      visitList5(node.statements, "\n");
+      indentDec();
+    }
+    nl2();
+    _writer.print('}');
+    return null;
+  }
+  Object visitBlockFunctionBody(BlockFunctionBody node) {
+    visit(node.block);
+    return null;
+  }
+  Object visitBooleanLiteral(BooleanLiteral node) {
+    _writer.print(node.literal.lexeme);
+    return null;
+  }
+  Object visitBreakStatement(BreakStatement node) {
+    _writer.print("break");
+    visit7(" ", node.label);
+    _writer.print(";");
+    return null;
+  }
+  Object visitCascadeExpression(CascadeExpression node) {
+    visit(node.target);
+    visitList(node.cascadeSections);
+    return null;
+  }
+  Object visitCatchClause(CatchClause node) {
+    visit7("on ", node.exceptionType);
+    if (node.catchKeyword != null) {
+      if (node.exceptionType != null) {
+        _writer.print(' ');
+      }
+      _writer.print("catch (");
+      visit(node.exceptionParameter);
+      visit7(", ", node.stackTraceParameter);
+      _writer.print(") ");
+    } else {
+      _writer.print(" ");
+    }
+    visit(node.body);
+    return null;
+  }
+  Object visitClassDeclaration(ClassDeclaration node) {
+    visit(node.documentationComment);
+    visit8(node.abstractKeyword, " ");
+    _writer.print("class ");
+    visit(node.name);
+    visit(node.typeParameters);
+    visit7(" ", node.extendsClause);
+    visit7(" ", node.withClause);
+    visit7(" ", node.implementsClause);
+    _writer.print(" {");
+    {
+      indentInc();
+      visitList5(node.members, "\n");
+      indentDec();
+    }
+    nl2();
+    _writer.print("}");
+    return null;
+  }
+  Object visitClassTypeAlias(ClassTypeAlias node) {
+    _writer.print("typedef ");
+    visit(node.name);
+    visit(node.typeParameters);
+    _writer.print(" = ");
+    if (node.abstractKeyword != null) {
+      _writer.print("abstract ");
+    }
+    visit(node.superclass);
+    visit7(" ", node.withClause);
+    visit7(" ", node.implementsClause);
+    _writer.print(";");
+    return null;
+  }
+  Object visitComment(Comment node) {
+    Token token = node.beginToken;
+    while (token != null) {
+      bool firstLine = true;
+      for (String line in StringUtils.split(token.lexeme, "\n")) {
+        if (firstLine) {
+          firstLine = false;
+        } else {
+          line = " ${line.trim()}";
+          line = StringUtils.replace(line, "/*", "/ *");
+        }
+        _writer.print(line);
+        nl2();
+      }
+      if (token == node.endToken) {
+        break;
+      }
+    }
+    return null;
+  }
+  Object visitCommentReference(CommentReference node) => null;
+  Object visitCompilationUnit(CompilationUnit node) {
+    ScriptTag scriptTag5 = node.scriptTag;
+    NodeList<Directive> directives4 = node.directives;
+    visit(scriptTag5);
+    String prefix = scriptTag5 == null ? "" : " ";
+    visitList7(prefix, directives4, "\n");
+    prefix = scriptTag5 == null && directives4.isEmpty ? "" : "\n\n";
+    visitList7(prefix, node.declarations, "\n");
+    return null;
+  }
+  Object visitConditionalExpression(ConditionalExpression node) {
+    visit(node.condition);
+    _writer.print(" ? ");
+    visit(node.thenExpression);
+    _writer.print(" : ");
+    visit(node.elseExpression);
+    return null;
+  }
+  Object visitConstructorDeclaration(ConstructorDeclaration node) {
+    visit(node.documentationComment);
+    visit8(node.externalKeyword, " ");
+    visit8(node.constKeyword, " ");
+    visit8(node.factoryKeyword, " ");
+    visit(node.returnType);
+    visit7(".", node.name);
+    visit(node.parameters);
+    visitList7(" : ", node.initializers, ", ");
+    visit7(" = ", node.redirectedConstructor);
+    if (node.body is! EmptyFunctionBody) {
+      _writer.print(' ');
+    }
+    visit(node.body);
+    return null;
+  }
+  Object visitConstructorFieldInitializer(ConstructorFieldInitializer node) {
+    visit8(node.keyword, ".");
+    visit(node.fieldName);
+    _writer.print(" = ");
+    visit(node.expression);
+    return null;
+  }
+  Object visitConstructorName(ConstructorName node) {
+    visit(node.type);
+    visit7(".", node.name);
+    return null;
+  }
+  Object visitContinueStatement(ContinueStatement node) {
+    _writer.print("continue");
+    visit7(" ", node.label);
+    _writer.print(";");
+    return null;
+  }
+  Object visitDefaultFormalParameter(DefaultFormalParameter node) {
+    visit(node.parameter);
+    if (node.separator != null) {
+      _writer.print(" ");
+      _writer.print(node.separator.lexeme);
+      visit7(" ", node.defaultValue);
+    }
+    return null;
+  }
+  Object visitDoStatement(DoStatement node) {
+    _writer.print("do ");
+    visit(node.body);
+    _writer.print(" while (");
+    visit(node.condition);
+    _writer.print(");");
+    return null;
+  }
+  Object visitDoubleLiteral(DoubleLiteral node) {
+    _writer.print(node.literal.lexeme);
+    return null;
+  }
+  Object visitEmptyFunctionBody(EmptyFunctionBody node) {
+    _writer.print(';');
+    return null;
+  }
+  Object visitEmptyStatement(EmptyStatement node) {
+    _writer.print(';');
+    return null;
+  }
+  Object visitExportDirective(ExportDirective node) {
+    _writer.print("export ");
+    visit(node.libraryUri);
+    visitList7(" ", node.combinators, " ");
+    _writer.print(';');
+    return null;
+  }
+  Object visitExpressionFunctionBody(ExpressionFunctionBody node) {
+    _writer.print("=> ");
+    visit(node.expression);
+    if (node.semicolon != null) {
+      _writer.print(';');
+    }
+    return null;
+  }
+  Object visitExpressionStatement(ExpressionStatement node) {
+    visit(node.expression);
+    _writer.print(';');
+    return null;
+  }
+  Object visitExtendsClause(ExtendsClause node) {
+    _writer.print("extends ");
+    visit(node.superclass);
+    return null;
+  }
+  Object visitFieldDeclaration(FieldDeclaration node) {
+    visit(node.documentationComment);
+    visit8(node.keyword, " ");
+    visit(node.fields);
+    _writer.print(";");
+    return null;
+  }
+  Object visitFieldFormalParameter(FieldFormalParameter node) {
+    visit8(node.keyword, " ");
+    visit6(node.type, " ");
+    _writer.print("this.");
+    visit(node.identifier);
+    return null;
+  }
+  Object visitForEachStatement(ForEachStatement node) {
+    _writer.print("for (");
+    visit(node.loopParameter);
+    _writer.print(" in ");
+    visit(node.iterator);
+    _writer.print(") ");
+    visit(node.body);
+    return null;
+  }
+  Object visitFormalParameterList(FormalParameterList node) {
+    String groupEnd = null;
+    _writer.print('(');
+    NodeList<FormalParameter> parameters11 = node.parameters;
+    int size6 = parameters11.length;
+    for (int i = 0; i < size6; i++) {
+      FormalParameter parameter = parameters11[i];
+      if (i > 0) {
+        _writer.print(", ");
+      }
+      if (groupEnd == null && parameter is DefaultFormalParameter) {
+        if (parameter.kind == ParameterKind.NAMED) {
+          groupEnd = "}";
+          _writer.print('{');
+        } else {
+          groupEnd = "]";
+          _writer.print('[');
+        }
+      }
+      parameter.accept(this);
+    }
+    if (groupEnd != null) {
+      _writer.print(groupEnd);
+    }
+    _writer.print(')');
+    return null;
+  }
+  Object visitForStatement(ForStatement node) {
+    Expression initialization4 = node.initialization;
+    _writer.print("for (");
+    if (initialization4 != null) {
+      visit(initialization4);
+    } else {
+      visit(node.variables);
+    }
+    _writer.print(";");
+    visit7(" ", node.condition);
+    _writer.print(";");
+    visitList7(" ", node.updaters, ", ");
+    _writer.print(") ");
+    visit(node.body);
+    return null;
+  }
+  Object visitFunctionDeclaration(FunctionDeclaration node) {
+    visit6(node.returnType, " ");
+    visit8(node.propertyKeyword, " ");
+    visit(node.name);
+    visit(node.functionExpression);
+    return null;
+  }
+  Object visitFunctionDeclarationStatement(FunctionDeclarationStatement node) {
+    visit(node.functionDeclaration);
+    _writer.print(';');
+    return null;
+  }
+  Object visitFunctionExpression(FunctionExpression node) {
+    visit(node.parameters);
+    _writer.print(' ');
+    visit(node.body);
+    return null;
+  }
+  Object visitFunctionExpressionInvocation(FunctionExpressionInvocation node) {
+    visit(node.function);
+    visit(node.argumentList);
+    return null;
+  }
+  Object visitFunctionTypeAlias(FunctionTypeAlias node) {
+    _writer.print("typedef ");
+    visit6(node.returnType, " ");
+    visit(node.name);
+    visit(node.typeParameters);
+    visit(node.parameters);
+    _writer.print(";");
+    return null;
+  }
+  Object visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) {
+    visit6(node.returnType, " ");
+    visit(node.identifier);
+    visit(node.parameters);
+    return null;
+  }
+  Object visitHideCombinator(HideCombinator node) {
+    _writer.print("hide ");
+    visitList5(node.hiddenNames, ", ");
+    return null;
+  }
+  Object visitIfStatement(IfStatement node) {
+    _writer.print("if (");
+    visit(node.condition);
+    _writer.print(") ");
+    visit(node.thenStatement);
+    visit7(" else ", node.elseStatement);
+    return null;
+  }
+  Object visitImplementsClause(ImplementsClause node) {
+    _writer.print("implements ");
+    visitList5(node.interfaces, ", ");
+    return null;
+  }
+  Object visitImportDirective(ImportDirective node) {
+    _writer.print("import ");
+    visit(node.libraryUri);
+    visit7(" as ", node.prefix);
+    visitList7(" ", node.combinators, " ");
+    _writer.print(';');
+    return null;
+  }
+  Object visitIndexExpression(IndexExpression node) {
+    if (node.isCascaded()) {
+      _writer.print("..");
+    } else {
+      visit(node.array);
+    }
+    _writer.print('[');
+    visit(node.index);
+    _writer.print(']');
+    return null;
+  }
+  Object visitInstanceCreationExpression(InstanceCreationExpression node) {
+    visit8(node.keyword, " ");
+    visit(node.constructorName);
+    visit(node.argumentList);
+    return null;
+  }
+  Object visitIntegerLiteral(IntegerLiteral node) {
+    _writer.print(node.literal.lexeme);
+    return null;
+  }
+  Object visitInterpolationExpression(InterpolationExpression node) {
+    if (node.rightBracket != null) {
+      _writer.print("\${");
+      visit(node.expression);
+      _writer.print("}");
+    } else {
+      _writer.print("\$");
+      visit(node.expression);
+    }
+    return null;
+  }
+  Object visitInterpolationString(InterpolationString node) {
+    _writer.print(node.contents.lexeme);
+    return null;
+  }
+  Object visitIsExpression(IsExpression node) {
+    visit(node.expression);
+    if (node.notOperator == null) {
+      _writer.print(" is ");
+    } else {
+      _writer.print(" is! ");
+    }
+    visit(node.type);
+    return null;
+  }
+  Object visitLabel(Label node) {
+    visit(node.label);
+    _writer.print(":");
+    return null;
+  }
+  Object visitLabeledStatement(LabeledStatement node) {
+    visitList6(node.labels, " ", " ");
+    visit(node.statement);
+    return null;
+  }
+  Object visitLibraryDirective(LibraryDirective node) {
+    _writer.print("library ");
+    visit(node.name);
+    _writer.print(';');
+    nl();
+    return null;
+  }
+  Object visitLibraryIdentifier(LibraryIdentifier node) {
+    _writer.print(node.name);
+    return null;
+  }
+  Object visitListLiteral(ListLiteral node) {
+    if (node.modifier != null) {
+      _writer.print(node.modifier.lexeme);
+      _writer.print(' ');
+    }
+    visit6(node.typeArguments, " ");
+    _writer.print("[");
+    visitList5(node.elements, ", ");
+    _writer.print("]");
+    return null;
+  }
+  Object visitMapLiteral(MapLiteral node) {
+    if (node.modifier != null) {
+      _writer.print(node.modifier.lexeme);
+      _writer.print(' ');
+    }
+    visit6(node.typeArguments, " ");
+    _writer.print("{");
+    visitList5(node.entries, ", ");
+    _writer.print("}");
+    return null;
+  }
+  Object visitMapLiteralEntry(MapLiteralEntry node) {
+    visit(node.key);
+    _writer.print(" : ");
+    visit(node.value);
+    return null;
+  }
+  Object visitMethodDeclaration(MethodDeclaration node) {
+    visit(node.documentationComment);
+    visit8(node.externalKeyword, " ");
+    visit8(node.modifierKeyword, " ");
+    visit6(node.returnType, " ");
+    visit8(node.propertyKeyword, " ");
+    visit8(node.operatorKeyword, " ");
+    visit(node.name);
+    if (!node.isGetter()) {
+      visit(node.parameters);
+    }
+    if (node.body is! EmptyFunctionBody) {
+      _writer.print(' ');
+    }
+    visit(node.body);
+    return null;
+  }
+  Object visitMethodInvocation(MethodInvocation node) {
+    if (node.isCascaded()) {
+      _writer.print("..");
+    } else {
+      visit6(node.target, ".");
+    }
+    visit(node.methodName);
+    visit(node.argumentList);
+    return null;
+  }
+  Object visitNamedExpression(NamedExpression node) {
+    visit(node.name);
+    visit7(" ", node.expression);
+    return null;
+  }
+  Object visitNullLiteral(NullLiteral node) {
+    _writer.print("null");
+    return null;
+  }
+  Object visitParenthesizedExpression(ParenthesizedExpression node) {
+    _writer.print('(');
+    visit(node.expression);
+    _writer.print(')');
+    return null;
+  }
+  Object visitPartDirective(PartDirective node) {
+    _writer.print("part ");
+    visit(node.partUri);
+    _writer.print(';');
+    return null;
+  }
+  Object visitPartOfDirective(PartOfDirective node) {
+    _writer.print("part of ");
+    visit(node.libraryName);
+    _writer.print(';');
+    return null;
+  }
+  Object visitPostfixExpression(PostfixExpression node) {
+    visit(node.operand);
+    _writer.print(node.operator.lexeme);
+    return null;
+  }
+  Object visitPrefixedIdentifier(PrefixedIdentifier node) {
+    visit(node.prefix);
+    _writer.print('.');
+    visit(node.identifier);
+    return null;
+  }
+  Object visitPrefixExpression(PrefixExpression node) {
+    _writer.print(node.operator.lexeme);
+    visit(node.operand);
+    return null;
+  }
+  Object visitPropertyAccess(PropertyAccess node) {
+    if (node.isCascaded()) {
+      _writer.print("..");
+    } else {
+      visit6(node.target, ".");
+    }
+    visit(node.propertyName);
+    return null;
+  }
+  Object visitRedirectingConstructorInvocation(RedirectingConstructorInvocation node) {
+    _writer.print("this");
+    visit7(".", node.constructorName);
+    visit(node.argumentList);
+    return null;
+  }
+  Object visitReturnStatement(ReturnStatement node) {
+    Expression expression15 = node.expression;
+    if (expression15 == null) {
+      _writer.print("return;");
+    } else {
+      _writer.print("return ");
+      expression15.accept(this);
+      _writer.print(";");
+    }
+    return null;
+  }
+  Object visitScriptTag(ScriptTag node) {
+    _writer.print(node.scriptTag.lexeme);
+    return null;
+  }
+  Object visitShowCombinator(ShowCombinator node) {
+    _writer.print("show ");
+    visitList5(node.shownNames, ", ");
+    return null;
+  }
+  Object visitSimpleFormalParameter(SimpleFormalParameter node) {
+    visit8(node.keyword, " ");
+    visit6(node.type, " ");
+    visit(node.identifier);
+    return null;
+  }
+  Object visitSimpleIdentifier(SimpleIdentifier node) {
+    _writer.print(node.token.lexeme);
+    return null;
+  }
+  Object visitSimpleStringLiteral(SimpleStringLiteral node) {
+    _writer.print(node.literal.lexeme);
+    return null;
+  }
+  Object visitStringInterpolation(StringInterpolation node) {
+    visitList(node.elements);
+    return null;
+  }
+  Object visitSuperConstructorInvocation(SuperConstructorInvocation node) {
+    _writer.print("super");
+    visit7(".", node.constructorName);
+    visit(node.argumentList);
+    return null;
+  }
+  Object visitSuperExpression(SuperExpression node) {
+    _writer.print("super");
+    return null;
+  }
+  Object visitSwitchCase(SwitchCase node) {
+    visitList6(node.labels, " ", " ");
+    _writer.print("case ");
+    visit(node.expression);
+    _writer.print(": ");
+    {
+      indentInc();
+      visitList5(node.statements, "\n");
+      indentDec();
+    }
+    return null;
+  }
+  Object visitSwitchDefault(SwitchDefault node) {
+    visitList6(node.labels, " ", " ");
+    _writer.print("default: ");
+    {
+      indentInc();
+      visitList5(node.statements, "\n");
+      indentDec();
+    }
+    return null;
+  }
+  Object visitSwitchStatement(SwitchStatement node) {
+    _writer.print("switch (");
+    visit(node.expression);
+    _writer.print(") {");
+    {
+      indentInc();
+      visitList5(node.members, "\n");
+      indentDec();
+    }
+    nl2();
+    _writer.print('}');
+    return null;
+  }
+  Object visitThisExpression(ThisExpression node) {
+    _writer.print("this");
+    return null;
+  }
+  Object visitThrowExpression(ThrowExpression node) {
+    _writer.print("throw ");
+    visit(node.expression);
+    return null;
+  }
+  Object visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
+    visit6(node.variables, ";");
+    return null;
+  }
+  Object visitTryStatement(TryStatement node) {
+    _writer.print("try ");
+    visit(node.body);
+    visitList7(" ", node.catchClauses, " ");
+    visit7(" finally ", node.finallyClause);
+    return null;
+  }
+  Object visitTypeArgumentList(TypeArgumentList node) {
+    _writer.print('<');
+    visitList5(node.arguments, ", ");
+    _writer.print('>');
+    return null;
+  }
+  Object visitTypeName(TypeName node) {
+    visit(node.name);
+    visit(node.typeArguments);
+    return null;
+  }
+  Object visitTypeParameter(TypeParameter node) {
+    visit(node.name);
+    visit7(" extends ", node.bound);
+    return null;
+  }
+  Object visitTypeParameterList(TypeParameterList node) {
+    _writer.print('<');
+    visitList5(node.typeParameters, ", ");
+    _writer.print('>');
+    return null;
+  }
+  Object visitVariableDeclaration(VariableDeclaration node) {
+    visit(node.name);
+    visit7(" = ", node.initializer);
+    return null;
+  }
+  Object visitVariableDeclarationList(VariableDeclarationList node) {
+    visit8(node.keyword, " ");
+    visit6(node.type, " ");
+    visitList5(node.variables, ", ");
+    return null;
+  }
+  Object visitVariableDeclarationStatement(VariableDeclarationStatement node) {
+    visit(node.variables);
+    _writer.print(";");
+    return null;
+  }
+  Object visitWhileStatement(WhileStatement node) {
+    _writer.print("while (");
+    visit(node.condition);
+    _writer.print(") ");
+    visit(node.body);
+    return null;
+  }
+  Object visitWithClause(WithClause node) {
+    _writer.print("with ");
+    visitList5(node.mixinTypes, ", ");
+    return null;
+  }
+  void indent() {
+    _writer.print(_indentString);
+  }
+  void indentDec() {
+    _indentLevel -= 2;
+    _indentString = StringUtils.repeat(" ", _indentLevel);
+  }
+  void indentInc() {
+    _indentLevel += 2;
+    _indentString = StringUtils.repeat(" ", _indentLevel);
+  }
+  void nl() {
+    _writer.print("\n");
+  }
+  void nl2() {
+    nl();
+    indent();
+  }
+  /**
+   * Safely visit the given node.
+   * @param node the node to be visited
+   */
+  void visit(ASTNode node) {
+    if (node != null) {
+      node.accept(this);
+    }
+  }
+  /**
+   * Safely visit the given node, printing the suffix after the node if it is non-<code>null</code>.
+   * @param suffix the suffix to be printed if there is a node to visit
+   * @param node the node to be visited
+   */
+  void visit6(ASTNode node, String suffix) {
+    if (node != null) {
+      node.accept(this);
+      _writer.print(suffix);
+    }
+  }
+  /**
+   * Safely visit the given node, printing the prefix before the node if it is non-<code>null</code>
+   * .
+   * @param prefix the prefix to be printed if there is a node to visit
+   * @param node the node to be visited
+   */
+  void visit7(String prefix, ASTNode node) {
+    if (node != null) {
+      _writer.print(prefix);
+      node.accept(this);
+    }
+  }
+  /**
+   * Safely visit the given node, printing the suffix after the node if it is non-<code>null</code>.
+   * @param suffix the suffix to be printed if there is a node to visit
+   * @param node the node to be visited
+   */
+  void visit8(Token token, String suffix) {
+    if (token != null) {
+      _writer.print(token.lexeme);
+      _writer.print(suffix);
+    }
+  }
+  /**
+   * Print a list of nodes without any separation.
+   * @param nodes the nodes to be printed
+   * @param separator the separator to be printed between adjacent nodes
+   */
+  void visitList(NodeList<ASTNode> nodes) {
+    visitList5(nodes, "");
+  }
+  /**
+   * Print a list of nodes, separated by the given separator.
+   * @param nodes the nodes to be printed
+   * @param separator the separator to be printed between adjacent nodes
+   */
+  void visitList5(NodeList<ASTNode> nodes, String separator) {
+    if (nodes != null) {
+      int size7 = nodes.length;
+      for (int i = 0; i < size7; i++) {
+        if ("\n" == separator) {
+          _writer.print("\n");
+          indent();
+        } else if (i > 0) {
+          _writer.print(separator);
+        }
+        nodes[i].accept(this);
+      }
+    }
+  }
+  /**
+   * Print a list of nodes, separated by the given separator.
+   * @param nodes the nodes to be printed
+   * @param separator the separator to be printed between adjacent nodes
+   * @param suffix the suffix to be printed if the list is not empty
+   */
+  void visitList6(NodeList<ASTNode> nodes, String separator, String suffix) {
+    if (nodes != null) {
+      int size8 = nodes.length;
+      if (size8 > 0) {
+        for (int i = 0; i < size8; i++) {
+          if (i > 0) {
+            _writer.print(separator);
+          }
+          nodes[i].accept(this);
+        }
+        _writer.print(suffix);
+      }
+    }
+  }
+  /**
+   * Print a list of nodes, separated by the given separator.
+   * @param prefix the prefix to be printed if the list is not empty
+   * @param nodes the nodes to be printed
+   * @param separator the separator to be printed between adjacent nodes
+   */
+  void visitList7(String prefix, NodeList<ASTNode> nodes, String separator) {
+    if (nodes != null) {
+      int size9 = nodes.length;
+      if (size9 > 0) {
+        _writer.print(prefix);
+        for (int i = 0; i < size9; i++) {
+          if (i > 0) {
+            _writer.print(separator);
+          }
+          nodes[i].accept(this);
+        }
+      }
+    }
+  }
+}