blob: 49e85786f57c279ea89ddfa0966cddb9493be603 [file] [log] [blame]
/*******************************************************************************
* Copyright (c) 2000, 2011 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.corext.refactoring.util;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.core.compiler.IScanner;
import org.eclipse.jdt.core.compiler.ITerminalSymbols;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.rewrite.TargetSourceRangeComputer;
import org.eclipse.jdt.core.formatter.IndentManipulation;
import org.eclipse.jdt.internal.corext.dom.TokenScanner;
public class SelectionAwareSourceRangeComputer extends TargetSourceRangeComputer {
private ASTNode[] fSelectedNodes;
private int fSelectionStart;
private int fSelectionLength;
private Map<ASTNode, SourceRange> fRanges;
private String fDocumentPortionToScan;
public SelectionAwareSourceRangeComputer(ASTNode[] selectedNodes, IBuffer buffer, int selectionStart, int selectionLength) {
fSelectedNodes= selectedNodes;
fSelectionStart= selectionStart;
fSelectionLength= selectionLength;
fDocumentPortionToScan= buffer.getText(fSelectionStart, fSelectionLength);
}
@Override
public SourceRange computeSourceRange(ASTNode node) {
try {
if (fRanges == null)
initializeRanges();
SourceRange result= fRanges.get(node);
if (result != null)
return result;
return super.computeSourceRange(node);
} catch (CoreException e) {
// fall back to standard implementation
fRanges= new HashMap<ASTNode, SourceRange>();
}
return super.computeSourceRange(node);
}
private void initializeRanges() throws CoreException {
fRanges= new HashMap<ASTNode, SourceRange>();
if (fSelectedNodes.length == 0)
return;
fRanges.put(fSelectedNodes[0], super.computeSourceRange(fSelectedNodes[0]));
int last= fSelectedNodes.length - 1;
fRanges.put(fSelectedNodes[last], super.computeSourceRange(fSelectedNodes[last]));
IScanner scanner= ToolFactory.createScanner(true, false, false, false);
char[] source= fDocumentPortionToScan.toCharArray();
scanner.setSource(source);
fDocumentPortionToScan= null; // initializeRanges() is only called once
TokenScanner tokenizer= new TokenScanner(scanner);
int pos= tokenizer.getNextStartOffset(0, false);
ASTNode currentNode= fSelectedNodes[0];
int newStart= Math.min(fSelectionStart + pos, currentNode.getStartPosition());
SourceRange range= fRanges.get(currentNode);
fRanges.put(currentNode, new SourceRange(newStart, range.getLength() + range.getStartPosition() - newStart));
currentNode= fSelectedNodes[last];
int scannerStart= currentNode.getStartPosition() + currentNode.getLength() - fSelectionStart;
tokenizer.setOffset(scannerStart);
pos= scannerStart;
int token= -1;
try {
while (true) {
token= tokenizer.readNext(false);
pos= tokenizer.getCurrentEndOffset();
}
} catch (CoreException e) {
}
if (token == ITerminalSymbols.TokenNameCOMMENT_LINE) {
int index= pos - 1;
while (index >= 0 && IndentManipulation.isLineDelimiterChar(source[index])) {
pos--;
index--;
}
}
int newEnd= Math.max(fSelectionStart + pos, currentNode.getStartPosition() + currentNode.getLength());
range= fRanges.get(currentNode);
fRanges.put(currentNode, new SourceRange(range.getStartPosition(), newEnd - range.getStartPosition()));
}
}