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 / CssDoubleClickStrategy.java

diff --git a/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssDoubleClickStrategy.java b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssDoubleClickStrategy.java
new file mode 100644 (file)
index 0000000..2e45960
--- /dev/null
+++ b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssDoubleClickStrategy.java
@@ -0,0 +1,116 @@
+/*
+ * 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: CssDoubleClickStrategy.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 net.sourceforge.phpeclipse.css.ui.CssUI;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.ITextDoubleClickStrategy;
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.source.ICharacterPairMatcher;
+import org.eclipse.jface.util.Assert;
+
+/**
+ * Strategy for selecting CSS identifiers on double click in the editor.
+ * 
+ * This strategy implements selection of CSS identifiers on double click inside
+ * an identifier, as well as selection of blocks delimited by square brackets,
+ * curly braces and parenthesis when the user double clicks directly after
+ * either the opening or the closing delimiter.
+ */
+public class CssDoubleClickStrategy implements ITextDoubleClickStrategy {
+
+       // Instance Variables ------------------------------------------------------
+
+       /**
+        * The pair matcher used to select ranges delimited by matching pairs of
+        * braces, brackets and parenthesis.
+        */
+       private ICharacterPairMatcher pairMatcher = new CssPairMatcher();
+
+       // ITextDoubleClickStrategy Implementation ---------------------------------
+
+       /*
+        * @see ITextDoubleClickStrategy#doubleClicked(ITextViewer)
+        */
+       public void doubleClicked(ITextViewer viewer) {
+               IDocument document = viewer.getDocument();
+               if (document.getLength() == 0) {
+                       return;   
+               }
+               int offset = viewer.getSelectedRange().x;
+               Assert.isLegal(offset >= 0,
+                       "Double click offset may not be negative"); //$NON-NLS-1$
+               Assert.isLegal(offset <= document.getLength(),
+                       "Double click offset out of range"); //$NON-NLS-1$
+               IRegion region = pairMatcher.match(document, offset);
+               if ((region != null) && (region.getLength() >= 2)) {
+                       viewer.setSelectedRange(region.getOffset() + 1,
+                               region.getLength() - 2);
+               } else {
+                       try {
+                               region = getSurroundingIdentifier(document, offset);
+                               if (region != null) {
+                                       viewer.setSelectedRange(
+                                               region.getOffset(), region.getLength());
+                               }
+                       } catch (BadLocationException e) {
+                               CssUI.log("Failed to get surrounding " + //$NON-NLS-1$
+                                       "word for double click selection"); //$NON-NLS-1$
+                       }
+               }
+       }
+
+       // Private Methods ---------------------------------------------------------
+
+       /**
+        * Returns the region that delimits the identifier surrounding the given
+        * offset into the document. If no identifier is found at the specified
+        * offset, this method returns <code>null</code>.
+        * 
+        * @param doc the document
+        * @param offset the zero-based offset into the document
+        * @return the region covered by the identifier, or <code>null</code> if no
+        *         identifier was found at that offset
+        */
+       private IRegion getSurroundingIdentifier(IDocument doc, int offset)
+               throws BadLocationException {
+               IRegion retVal = null;
+               int length = doc.getLength();
+               offset = Math.min(offset, length - 1);
+               if (CssTextUtils.isCssIdentifierPart(doc.getChar(offset))) {
+                       int start = offset;
+                       while (start > 0) {
+                               if (!CssTextUtils.isCssIdentifierPart(doc.getChar(start - 1))) {
+                                       break;
+                               }
+                               start--;
+                       }
+                       int end = offset;
+                       while (end < (length - 1)) {
+                               if (!CssTextUtils.isCssIdentifierPart(doc.getChar(end + 1))) {
+                                       break;
+                               }
+                               end++;
+                       }
+                       retVal = new Region(start, end - start + 1);
+               }
+               return retVal;
+       }
+
+}