--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.chromium.debug.ui/src/org/chromium/debug/ui/editors/JsPartitionScanner.java	Wed Dec 23 17:13:18 2009 -0800
@@ -0,0 +1,76 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.debug.ui.editors;
+
+import org.eclipse.jface.text.rules.EndOfLineRule;
+import org.eclipse.jface.text.rules.ICharacterScanner;
+import org.eclipse.jface.text.rules.IPredicateRule;
+import org.eclipse.jface.text.rules.IToken;
+import org.eclipse.jface.text.rules.IWordDetector;
+import org.eclipse.jface.text.rules.MultiLineRule;
+import org.eclipse.jface.text.rules.RuleBasedPartitionScanner;
+import org.eclipse.jface.text.rules.SingleLineRule;
+import org.eclipse.jface.text.rules.Token;
+import org.eclipse.jface.text.rules.WordRule;
+
+/**
+ * JavaScript partition scanner.
+ */
+public class JsPartitionScanner extends RuleBasedPartitionScanner {
+
+  static final String PARTITIONING = "ChromiumJavaScriptPartitioning"; //$NON-NLS-1$
+  static final String MULTILINE_COMMENT= "__js_multiline_comment"; //$NON-NLS-1$
+  static final String JSDOC = "__jsdoc"; //$NON-NLS-1$
+  static final String[] PARTITION_TYPES = {
+    MULTILINE_COMMENT,
+    JSDOC
+  };
+
+  /**
+   * Empty comments should be handled so as not to be confused with JSDoc.
+   */
+  private static class EmptyCommentDetector implements IWordDetector {
+
+    public boolean isWordStart(char c) {
+      return (c == '/');
+    }
+
+    public boolean isWordPart(char c) {
+      return (c == '*' || c == '/');
+    }
+  }
+
+  private static class EmptyCommentPredicateRule extends WordRule implements IPredicateRule {
+    private final IToken successToken;
+
+    public EmptyCommentPredicateRule(IToken successToken) {
+      super(new EmptyCommentDetector());
+      this.successToken = successToken;
+      addWord("/**/", successToken); //$NON-NLS-1$
+    }
+
+    public IToken evaluate(ICharacterScanner scanner, boolean resume) {
+      return super.evaluate(scanner);
+    }
+
+    public IToken getSuccessToken() {
+      return successToken;
+    }
+  }
+
+  public JsPartitionScanner() {
+    IToken jsDocToken= new Token(JSDOC);
+    IToken multilineCommentToken= new Token(MULTILINE_COMMENT);
+
+    setPredicateRules(new IPredicateRule[] {
+        new EndOfLineRule("//", Token.UNDEFINED), //$NON-NLS-1$
+        new SingleLineRule("\"", "\"", Token.UNDEFINED, '\\'), //$NON-NLS-2$ //$NON-NLS-1$
+        new SingleLineRule("'", "'", Token.UNDEFINED, '\\'), //$NON-NLS-2$ //$NON-NLS-1$
+        new EmptyCommentPredicateRule(multilineCommentToken),
+        new MultiLineRule("/**", "*/", jsDocToken, (char) 0, true),  //$NON-NLS-1$ //$NON-NLS-2$
+        new MultiLineRule("/*", "*/", multilineCommentToken, (char) 0, true) //$NON-NLS-1$ //$NON-NLS-2$
+    });
+  }
+}