| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| |
| 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 IDocument fDocument; |
| private int fSelectionStart; |
| private int fSelectionLength; |
| |
| private Map/*<ASTNode, SourceRange>*/ fRanges; |
| |
| public SelectionAwareSourceRangeComputer(ASTNode[] selectedNodes, IDocument document, int selectionStart, int selectionLength) throws BadLocationException, CoreException { |
| fSelectedNodes= selectedNodes; |
| fDocument= document; |
| fSelectionStart= selectionStart; |
| fSelectionLength= selectionLength; |
| } |
| |
| public SourceRange computeSourceRange(ASTNode node) { |
| try { |
| if (fRanges == null) |
| initializeRanges(); |
| SourceRange result= (SourceRange)fRanges.get(node); |
| if (result != null) |
| return result; |
| return super.computeSourceRange(node); |
| } catch (BadLocationException e) { |
| // fall back to standard implementation |
| fRanges= new HashMap(); |
| } catch (CoreException e) { |
| // fall back to standard implementation |
| fRanges= new HashMap(); |
| } |
| return super.computeSourceRange(node); |
| } |
| |
| private void initializeRanges() throws BadLocationException, CoreException { |
| fRanges= new HashMap(); |
| 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); |
| String documentPortionToScan= fDocument.get(fSelectionStart, fSelectionLength); |
| scanner.setSource(documentPortionToScan.toCharArray()); |
| 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= (SourceRange)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(documentPortionToScan.charAt(index))) { |
| pos--; |
| index--; |
| } |
| } |
| |
| int newEnd= Math.max(fSelectionStart + pos, currentNode.getStartPosition() + currentNode.getLength()); |
| range= (SourceRange)fRanges.get(currentNode); |
| fRanges.put(currentNode, new SourceRange(range.getStartPosition(), newEnd - range.getStartPosition())); |
| } |
| } |