/*******************************************************************************
* Copyright (c) 2010 Tomasz Wesolowski and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tomasz Wesolowski - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.actions;
import java.util.ResourceBundle;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.model.ISourceRange;
import org.eclipse.cdt.internal.core.model.ext.SourceRange;
import org.eclipse.cdt.internal.ui.editor.SelectionHistory;
public class StructureSelectPreviousAction extends StructureSelectionAction {
public static final String PREFIX = "StructureSelectPrevious."; //$NON-NLS-1$
public StructureSelectPreviousAction(ResourceBundle bundle, ITextEditor editor,
SelectionHistory history) {
super(bundle, PREFIX, editor, history);
}
@Override
public ISourceRange doExpand(IASTTranslationUnit ast, SourceRange current) {
ISourceRange newSourceRange = expandToPrevious(ast, current);
if (newSourceRange == null) {
newSourceRange = StructureSelectEnclosingAction.expandToEnclosing(ast, current);
}
if (newSourceRange != null) {
history.remember(current);
}
return newSourceRange;
}
private ISourceRange expandToPrevious(IASTTranslationUnit ast, SourceRange current) {
IASTNode enclosingNode = ast.getNodeSelector(null).findEnclosingNode(current.getStartPos(),
current.getLength());
if (samePosition(enclosingNode, current)) {
enclosingNode = enclosingNode.getParent();
}
if (enclosingNode == null) {
return null;
}
// find the first child of enclosingNode containing selection end
int selectionStart = current.getStartPos();
int firstSelectedChildIndex = -1;
IASTNode[] children = enclosingNode.getChildren();
for (int i = 0; i < children.length; i++) {
IASTNode node = children[i];
if (nodeContains(node, selectionStart)) {
firstSelectedChildIndex = i;
break;
}
}
if (firstSelectedChildIndex != -1 && firstSelectedChildIndex-1 >= 0) {
IASTNode prevNode = children[firstSelectedChildIndex-1];
int endingOffset = current.getStartPos() + current.getLength();
return new SourceRange(prevNode.getFileLocation().getNodeOffset(), endingOffset - prevNode.getFileLocation().getNodeOffset());
}
return null;
}
}