| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.jface.text; |
| |
| |
| /** |
| * This strategy always copies the indentation of the previous line. |
| * <p> |
| * This class is not intended to be subclassed.</p> |
| * |
| * @since 3.1 |
| */ |
| public class DefaultIndentLineAutoEditStrategy implements IAutoEditStrategy { |
| |
| /** |
| * Creates a new indent line auto edit strategy which can be installed on |
| * text viewers. |
| */ |
| public DefaultIndentLineAutoEditStrategy() { |
| } |
| |
| /** |
| * Returns the first offset greater than <code>offset</code> and smaller than |
| * <code>end</code> whose character is not a space or tab character. If no such |
| * offset is found, <code>end</code> is returned. |
| * |
| * @param document the document to search in |
| * @param offset the offset at which searching start |
| * @param end the offset at which searching stops |
| * @return the offset in the specified range whose character is not a space or tab |
| * @exception BadLocationException if position is an invalid range in the given document |
| */ |
| protected int findEndOfWhiteSpace(IDocument document, int offset, int end) throws BadLocationException { |
| while (offset < end) { |
| char c= document.getChar(offset); |
| if (c != ' ' && c != '\t') { |
| return offset; |
| } |
| offset++; |
| } |
| return end; |
| } |
| |
| /** |
| * Copies the indentation of the previous line. |
| * |
| * @param d the document to work on |
| * @param c the command to deal with |
| */ |
| private void autoIndentAfterNewLine(IDocument d, DocumentCommand c) { |
| |
| if (c.offset == -1 || d.getLength() == 0) |
| return; |
| |
| try { |
| // find start of line |
| int p= (c.offset == d.getLength() ? c.offset - 1 : c.offset); |
| IRegion info= d.getLineInformationOfOffset(p); |
| int start= info.getOffset(); |
| |
| // find white spaces |
| int end= findEndOfWhiteSpace(d, start, c.offset); |
| |
| StringBuilder buf= new StringBuilder(c.text); |
| if (end > start) { |
| // append to input |
| buf.append(d.get(start, end - start)); |
| } |
| |
| c.text= buf.toString(); |
| |
| } catch (BadLocationException excp) { |
| // stop work |
| } |
| } |
| |
| @Override |
| public void customizeDocumentCommand(IDocument d, DocumentCommand c) { |
| if (c.length == 0 && c.text != null && TextUtilities.endsWith(d.getLegalLineDelimiters(), c.text) != -1) |
| autoIndentAfterNewLine(d, c); |
| } |
| } |