New analyzer_experimental snapshot.

pkg/analyzer_experimental/lib/src/generated/scanner.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.scanner;
 import 'dart:collection';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'source.dart';
 import 'error.dart';
 import 'instrumentation.dart';
 /**
@@ skipping 409 matching lines @@
    */
   List<int> _lineStarts = new List<int>();
 
   /**
    * A list, treated something like a stack, of tokens representing the beginning of a matched pair.
    * It is used to pair the end tokens with the begin tokens.
    */
   List<BeginToken> _groupingStack = new List<BeginToken>();
 
   /**
+   * The index of the last item in the [groupingStack], or `-1` if the stack is empty.
+   */
+  int _stackEnd = -1;
+
+  /**
    * A flag indicating whether any unmatched groups were found during the parse.
    */
   bool _hasUnmatchedGroups2 = false;
 
   /**
    * Initialize a newly created scanner.
    *
    * @param source the source being scanned
    * @param errorListener the error listener that will be informed of any errors that are found
    */
@@ skipping 88 matching lines @@
     BeginToken token;
     if (_firstComment == null) {
       token = new BeginToken(type, _tokenStart);
     } else {
       token = new BeginTokenWithComment(type, _tokenStart, _firstComment);
       _firstComment = null;
       _lastComment = null;
     }
     _tail = _tail.setNext(token);
     _groupingStack.add(token);
+    _stackEnd++;
   }
   void appendCommentToken(TokenType type, String value) {
     if (_firstComment == null) {
       _firstComment = new StringToken(type, value, _tokenStart);
       _lastComment = _firstComment;
     } else {
       _lastComment = _lastComment.setNext(new StringToken(type, value, _tokenStart));
     }
   }
   void appendEndToken(TokenType type, TokenType beginType) {
     Token token;
     if (_firstComment == null) {
       token = new Token(type, _tokenStart);
     } else {
       token = new TokenWithComment(type, _tokenStart, _firstComment);
       _firstComment = null;
       _lastComment = null;
     }
     _tail = _tail.setNext(token);
-    int last = _groupingStack.length - 1;
-    if (last >= 0) {
-      BeginToken begin = _groupingStack[last];
+    if (_stackEnd >= 0) {
+      BeginToken begin = _groupingStack[_stackEnd];
       if (identical(begin.type, beginType)) {
         begin.endToken = token;
-        _groupingStack.removeAt(last);
+        _groupingStack.removeAt(_stackEnd--);
       }
     }
   }
   void appendEofToken() {
     Token eofToken;
     if (_firstComment == null) {
       eofToken = new Token(TokenType.EOF, offset + 1);
     } else {
       eofToken = new TokenWithComment(TokenType.EOF, offset + 1, _firstComment);
       _firstComment = null;
       _lastComment = null;
     }
     eofToken.setNext(eofToken);
     _tail = _tail.setNext(eofToken);
-    if (!_groupingStack.isEmpty) {
+    if (_stackEnd >= 0) {
       _hasUnmatchedGroups2 = true;
     }
   }
   void appendKeywordToken(Keyword keyword) {
     if (_firstComment == null) {
       _tail = _tail.setNext(new KeywordToken(keyword, _tokenStart));
     } else {
       _tail = _tail.setNext(new KeywordTokenWithComment(keyword, _tokenStart, _firstComment));
       _firstComment = null;
       _lastComment = null;
@@ skipping 180 matching lines @@
   }
 
   /**
    * Return the beginning token corresponding to a closing brace that was found while scanning
    * inside a string interpolation expression. Tokens that cannot be matched with the closing brace
    * will be dropped from the stack.
    *
    * @return the token to be paired with the closing brace
    */
   BeginToken findTokenMatchingClosingBraceInInterpolationExpression() {
-    int last = _groupingStack.length - 1;
-    while (last >= 0) {
-      BeginToken begin = _groupingStack[last];
+    while (_stackEnd >= 0) {
+      BeginToken begin = _groupingStack[_stackEnd];
       if (identical(begin.type, TokenType.OPEN_CURLY_BRACKET) || identical(begin.type, TokenType.STRING_INTERPOLATION_EXPRESSION)) {
         return begin;
       }
       _hasUnmatchedGroups2 = true;
-      _groupingStack.removeAt(last);
-      last--;
+      _groupingStack.removeAt(_stackEnd--);
     }
     return null;
   }
   Token firstToken() => _tokens.next;
 
   /**
    * Report an error at the current offset.
    *
    * @param errorCode the error code indicating the nature of the error
    * @param arguments any arguments needed to complete the error message
@@ skipping 1337 matching lines @@
    * Return `true` if this token type represents an operator that can be defined by users.
    *
    * @return `true` if this token type represents an operator that can be defined by users
    */
   bool get isUserDefinableOperator => identical(lexeme, "==") || identical(lexeme, "~") || identical(lexeme, "[]") || identical(lexeme, "[]=") || identical(lexeme, "*") || identical(lexeme, "/") || identical(lexeme, "%") || identical(lexeme, "~/") || identical(lexeme, "+") || identical(lexeme, "-") || identical(lexeme, "<<") || identical(lexeme, ">>") || identical(lexeme, ">=") || identical(lexeme, ">") || identical(lexeme, "<=") || identical(lexeme, "<") || identical(lexeme, "&") || identical(lexeme, "^") || identical(lexeme, "|");
 }
 class TokenType_EOF extends TokenType {
   TokenType_EOF(String name, int ordinal, TokenClass arg0, String arg1) : super.con2(name, ordinal, arg0, arg1);
   String toString() => "-eof-";
 }