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/*******************************************************************************
* Copyright (c) 2007, 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;
/**
* Auto edit strategy that converts tabs into spaces.
* <p>
* Clients usually instantiate and configure this class but
* can also extend it in their own subclass.
* </p>
*
* @since 3.3
*/
public class TabsToSpacesConverter implements IAutoEditStrategy {
private int fTabRatio;
private ILineTracker fLineTracker;
public void setNumberOfSpacesPerTab(int ratio) {
fTabRatio= ratio;
}
public void setLineTracker(ILineTracker lineTracker) {
fLineTracker= lineTracker;
}
private int insertTabString(StringBuilder buffer, int offsetInLine) {
if (fTabRatio == 0)
return 0;
int remainder= offsetInLine % fTabRatio;
remainder= fTabRatio - remainder;
for (int i= 0; i < remainder; i++)
buffer.append(' ');
return remainder;
}
@Override
public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
String text= command.text;
if (text == null)
return;
int index= text.indexOf('\t');
if (index > -1) {
StringBuilder buffer= new StringBuilder();
fLineTracker.set(command.text);
int lines= fLineTracker.getNumberOfLines();
try {
for (int i= 0; i < lines; i++) {
int offset= fLineTracker.getLineOffset(i);
int endOffset= offset + fLineTracker.getLineLength(i);
String line= text.substring(offset, endOffset);
int position= 0;
if (i == 0) {
IRegion firstLine= document.getLineInformationOfOffset(command.offset);
position= command.offset - firstLine.getOffset();
}
int length= line.length();
for (int j= 0; j < length; j++) {
char c= line.charAt(j);
if (c == '\t') {
position += insertTabString(buffer, position);
} else {
buffer.append(c);
++ position;
}
}
}
command.text= buffer.toString();
} catch (BadLocationException x) {
}
}
}
}
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