| /******************************************************************************* |
| * 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 org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| |
| /** |
| * @author vrepeshko |
| */ |
| public class DocumentUtils { |
| |
| /** |
| * 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 |
| */ |
| public static 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; |
| } |
| |
| /** |
| * Returns the line information of the offset. |
| * |
| * @param document |
| * the document |
| * @param offset |
| * the offset |
| * @return the line information of offset |
| * @throws BadLocationException |
| * if position is an invalid range in the given document |
| */ |
| public static IRegion getLineInformationOfOffset(IDocument document, int offset) throws BadLocationException { |
| int p = (offset == document.getLength()) ? (offset - 1) : offset; |
| if (p < 0) { |
| p = 0; |
| } |
| IRegion info = document.getLineInformationOfOffset(p); |
| return info; |
| } |
| |
| /** |
| * Returns the starting offset as a string. |
| * |
| * @param document |
| * the document |
| * @param offset |
| * the offset at which searching start |
| * @param end |
| * the offset at which searching stops |
| * @return the stating white space as a string |
| * @throws BadLocationException |
| */ |
| public static String getStartingWhiteSpace(IDocument document, int offset, int end) throws BadLocationException { |
| int whiteSpaceEnd = findEndOfWhiteSpace(document, offset, end); |
| return (whiteSpaceEnd > offset) ? document.get(offset, whiteSpaceEnd - offset) : ""; //$NON-NLS-1$ |
| } |
| |
| } |