intial source from ttp://www.sf.net/projects/wdte

[phpeclipse.git] / archive / net.sourceforge.phpeclipse.css.ui / src / net / sourceforge / phpeclipse / css / ui / internal / text / CssPairMatcher.java

diff --git a/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssPairMatcher.java b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssPairMatcher.java
new file mode 100644 (file)
index 0000000..b308117
--- /dev/null
+++ b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssPairMatcher.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2003-2004 Christopher Lenz and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     Christopher Lenz - initial API and implementation
+ * 
+ * $Id: CssPairMatcher.java,v 1.1 2004-09-02 18:11:48 jsurfer Exp $
+ */
+
+package net.sourceforge.phpeclipse.css.ui.internal.text;
+
+import net.sourceforge.phpeclipse.css.core.internal.text.CssTextUtils;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.source.ICharacterPairMatcher;
+import org.eclipse.jface.util.Assert;
+
+/**
+ * 
+ */
+public class CssPairMatcher implements ICharacterPairMatcher {
+
+       // Constants ---------------------------------------------------------------
+
+       private static final char PAIRS[] = {
+               '{', '}', '(', ')', '[', ']'
+       };
+
+       // Instance Variables ------------------------------------------------------
+
+       private IDocument document;
+
+       private int offset;
+
+       private int anchor;
+
+       // ICharacterPairMatcher Implementation ------------------------------------
+
+       /*
+        * @see ICharacterPairMatcher#clear
+        */
+       public void clear() {
+               document = null;
+               offset = -1;
+               anchor = 0;
+       }
+
+       /*
+        * @see ICharacterPairMatcher#dispose
+        */
+       public void dispose() {
+               document = null;
+       }
+
+       /*
+        * @see ICharacterPairMatcher#match
+        */
+       public IRegion match(IDocument document, int offset) {
+               Assert.isNotNull(document);
+               Assert.isLegal(offset >= 0);
+               this.document = document;
+               this.offset = offset;
+
+               IRegion retVal = null;
+               try {
+                       retVal = matchPairsAt();
+               } catch (BadLocationException e) {
+                       // ignore, there's probably no matching character to highlight
+               }
+               return retVal;
+       }
+
+       /*
+        * @see ICharacterPairMatcher#getAnchor
+        */
+       public int getAnchor() {
+               return anchor;
+       }
+
+       // Private Methods ---------------------------------------------------------
+
+       private boolean isClosingCharacter(char ch) {
+               for (int i = 1; i < PAIRS.length; i += 2) {
+                       if (ch == PAIRS[i]) {
+                               return true;
+                       }
+               }
+               return false;
+       }
+
+       private boolean isOpeningCharacter(char ch) {
+               for (int i = 0; i < PAIRS.length; i += 2) {
+                       if (ch == PAIRS[i]) {
+                               return true;
+                       }
+               }
+               return false;
+       }
+
+       private IRegion matchPairsAt() throws BadLocationException {
+               int startPos = -1, endPos = -1;
+               char prevChar = document.getChar(Math.max(offset - 1, 0));
+               if (isOpeningCharacter(prevChar)) {
+                       startPos = offset - 1;
+                       if (startPos >= 0) {
+                               anchor = LEFT;
+                               endPos = CssTextUtils.findMatchingClosingPeer(
+                                       document, startPos + 1, prevChar);
+                               if (endPos > -1) {
+                                       return new Region(startPos, endPos - startPos + 1);
+                               }
+                       }
+               }
+               if (isClosingCharacter(prevChar)) {
+                       endPos = offset - 1;
+                       if (endPos >= 0) {
+                               anchor = RIGHT;
+                               startPos = CssTextUtils.findMatchingOpeningPeer(
+                                       document, endPos - 1, prevChar);
+                               if (startPos > -1) {
+                                       return new Region(startPos, endPos - startPos + 1);
+                               }
+                       }
+               } 
+               return null;
+       }
+
+}