| /******************************************************************************* |
| * Copyright (c) 2007 Borland Software Corporation |
| * |
| * 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: |
| * Borland Software Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.m2m.internal.qvt.oml.editor.ui; |
| |
| import java.io.IOException; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.DocumentCommand; |
| import org.eclipse.jface.text.IAutoEditStrategy; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.TextUtilities; |
| |
| /** |
| * @author vrepeshko |
| */ |
| public class QvtIndentAutoEditStrategy implements IAutoEditStrategy { |
| |
| public void customizeDocumentCommand(IDocument document, DocumentCommand command) { |
| String newLineDelimeter = getNewLineDelimeter(document, command); |
| if (newLineDelimeter != null) { |
| smartAutoIndentAfterNewLine(document, command, newLineDelimeter); |
| } |
| } |
| |
| /** |
| * Smart indents after '{'. |
| * |
| * @param document |
| * the document to work on |
| * @param command |
| * the command to deal with |
| * @param newLineDelimeter |
| * the new line delimenter to use when needed |
| */ |
| private void smartAutoIndentAfterNewLine(IDocument document, DocumentCommand command, String newLineDelimeter) { |
| if (!checkCommandOffset(document, command)) { |
| return; |
| } |
| |
| try { |
| IRegion info = DocumentUtils.getLineInformationOfOffset(document, command.offset); |
| int currentLineStart = info.getOffset(); |
| String whiteSpace = DocumentUtils.getStartingWhiteSpace(document, currentLineStart, command.offset); |
| String currentLineText = document.get(currentLineStart, info.getLength()); |
| command.text = command.text + whiteSpace; |
| if (currentLineText.trim().endsWith("{")) { //$NON-NLS-1$ |
| command.text += '\t'; |
| if (computeBraceBalance(document) > 0) { |
| command.caretOffset = command.offset + command.text.length(); |
| command.shiftsCaret = false; |
| command.text += newLineDelimeter + whiteSpace + "}"; //$NON-NLS-1$ |
| } |
| return; |
| } |
| } catch (BadLocationException e) { |
| // ignore |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| |
| private int computeBraceBalance(IDocument document) throws IOException { |
| QvtCodeReader codeReader = new QvtCodeReader(); |
| codeReader.configureForwardReader(document, 0, document.getLength(), true, true); |
| int balance = 0; |
| int next; |
| while ((next = codeReader.read()) != QvtCodeReader.EOF) { |
| char c = (char) next; |
| if (c == '{') { |
| ++balance; |
| } else if (c == '}') { |
| --balance; |
| } |
| } |
| return balance; |
| } |
| |
| private static String getNewLineDelimeter(IDocument document, DocumentCommand command) { |
| if (command.length != 0 || command.text == null) { |
| return null; |
| } |
| String[] legalLineDelimiters = document.getLegalLineDelimiters(); |
| int i = TextUtilities.endsWith(legalLineDelimiters, command.text); |
| return (i != -1) ? legalLineDelimiters[i] : null; |
| } |
| |
| private static boolean checkCommandOffset(IDocument document, DocumentCommand command) { |
| return command.offset != -1 && document.getLength() != 0; |
| } |
| |
| } |