/**
* Copyright (c) 2005-2011 by Appcelerator, Inc. All Rights Reserved.
* Licensed under the terms of the Eclipse Public License (EPL).
* Please see the license.txt included with this distribution for details.
* Any modifications to this file must keep this entire header intact.
*/
/*
* @author: ptoofani
* Created: June 2004
*/
package org.python.pydev.editor.actions;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.IInputValidator;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.python.pydev.core.docutils.PySelection;
import org.python.pydev.editor.autoedit.DefaultIndentPrefs;
import com.aptana.shared_core.string.FastStringBuffer;
/**
* Converts tab-width spacing to tab characters in selection or entire document,
* if nothing selected.
*
* @author Parhaum Toofanian
*/
public class PyConvertSpaceToTab extends PyAction {
/* Selection element */
private PySelection ps;
/**
* Grabs the selection information and performs the action.
*/
public void run(IAction action) {
try {
if (!canModifyEditor()) {
return;
}
// Select from text editor
ps = new PySelection(getTextEditor());
ps.selectAll(false);
// Perform the action
perform(ps);
// Put cursor at the first area of the selection
getTextEditor().selectAndReveal(ps.getLineOffset(), 0);
} catch (Exception e) {
beep(e);
}
}
/**
* Performs the action with a given PySelection
*
* @param ps
* Given PySelection
* @return boolean The success or failure of the action
*/
public static boolean perform(PySelection ps) {
// What we'll be replacing the selected text with
FastStringBuffer strbuf = new FastStringBuffer();
// If they selected a partial line, count it as a full one
ps.selectCompleteLine();
int i;
try {
// For each line, strip their whitespace
String tabSpace = getTabSpace();
if (tabSpace == null) {
return false; //could not get it
}
IDocument doc = ps.getDoc();
int endLineIndex = ps.getEndLineIndex();
String endLineDelim = ps.getEndLineDelim();
for (i = ps.getStartLineIndex(); i <= endLineIndex; i++) {
IRegion lineInformation = doc.getLineInformation(i);
String line = doc.get(lineInformation.getOffset(), lineInformation.getLength());
strbuf.append(line.replaceAll(tabSpace, "\t")).append((i < endLineIndex ? endLineDelim : ""));
}
// If all goes well, replace the text with the modified information
doc.replace(ps.getStartLine().getOffset(), ps.getSelLength(), strbuf.toString());
return true;
} catch (Exception e) {
beep(e);
}
// In event of problems, return false
return false;
}
/**
* Currently returns an int of the Preferences' Tab Width.
*
* @return Tab width in preferences
*/
protected static String getTabSpace() {
class NumberValidator implements IInputValidator {
/*
* @see IInputValidator#isValid(String)
*/
public String isValid(String input) {
if (input == null || input.length() == 0)
return " ";
try {
int i = Integer.parseInt(input);
if (i <= 0)
return "Must be more than 0.";
} catch (NumberFormatException x) {
return x.getMessage();
}
return null;
}
}
InputDialog inputDialog = new InputDialog(getShell(), "Tab lenght",
"How many spaces should be considered for each tab?", "" + DefaultIndentPrefs.getStaticTabWidth(),
new NumberValidator());
if (inputDialog.open() != InputDialog.OK) {
return null;
}
StringBuffer sbuf = new StringBuffer();
int tabWidth = Integer.parseInt(inputDialog.getValue());
for (int i = 0; i < tabWidth; i++) {
sbuf.append(" ");
}
return sbuf.toString();
}
}