Cache model elements for compiler elements.

compiler/java/com/google/dart/compiler/parser/DartScanner.java

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 package com.google.dart.compiler.parser;
 
 import com.google.dart.compiler.metrics.DartEventType;
 import com.google.dart.compiler.metrics.Tracer;
 import com.google.dart.compiler.metrics.Tracer.TraceEvent;
+import com.google.dart.compiler.parser.DartScanner.InternalState.Mode;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Stack;
 
 /**
  * The Dart scanner. Should normally be used only by {@link DartParser}.
  */
 public class DartScanner {
 
@@ skipping 1295 matching lines @@
     int start = currPos - 1;
     advance();
     while (!isEos() && !isLineTerminator(lookahead(0)))
       advance();
     int stop = internalState.lookaheadPos[0];
     commentLocation(start, stop);
     return Token.COMMENT;
   }
 
   private void skipWhiteSpace() {
-    if ((internalState.getMode() != InternalState.Mode.DEFAULT)
-        && (internalState.getMode() != InternalState.Mode.IN_STRING_EMBEDDED_EXPRESSION)) {
+    Mode mode = internalState.getMode();
+    if ((mode != InternalState.Mode.DEFAULT)
+        && (mode != InternalState.Mode.IN_STRING_EMBEDDED_EXPRESSION)) {
       return;
     }
     while (true) {
-      if (isLineTerminator(lookahead(0))) {
-      } else if (!isWhiteSpace(lookahead(0))) {
+      int c = lookahead(0);
+      if (isLineTerminator(c)) {
+      } else if (!isWhiteSpace(c)) {
         break;
       }
       advance();
     }
   }
 }