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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* 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);
}
}
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