pyconverttabtospace.java

Python Development Environment (Python IDE plugin for Eclipse). Features editor, code completion, re

/*
 * @author: ptoofani
 * Created: June 2004
 * License: Common Public License v1.0
 */

package org.python.pydev.editor.actions;

import org.eclipse.jface.action.IAction;
import org.python.pydev.core.docutils.PySelection;


/**
 * Converts tab-width spacing to tab characters in selection or entire document, if nothing
 * selected.
 * 
 * @author Parhaum Toofanian
 */
public class PyConvertTabToSpace extends PyConvertSpaceToTab 
{
	/* Selection element */
	private static PySelection ps;


	/**
	 * Grabs the selection information and performs the action.
	 */
	public void run ( IAction action ) 
	{
		try 
		{
			// Select from text editor
			ps = new PySelection ( getTextEditor ( ));
			ps.selectAll(false);
			// Perform the action
			perform ( );

			// Put cursor at the first area of the selection
			getTextEditor ( ).selectAndReveal ( ps.getLineOffset ( ), 0 );
		} 
		catch ( Exception e ) 
		{
			beep ( e );
		}		
	}


	/**
	 * Performs the action with the class' PySelection.
	 * 
	 * @return boolean The success or failure of the action
	 */
	public static boolean perform ( )
	{
		return perform ( ps );
	}


	/**
	 * 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
		StringBuffer strbuf = new StringBuffer ( );
		
		// If they selected a partial line, count it as a full one
		ps.selectCompleteLine ( );
		
		int i;
	
		try 
		{
			// For each line, strip their whitespace
			for ( i = ps.getStartLineIndex(); i <= ps.getEndLineIndex(); i++ )
			{
				String line = ps.getDoc().get ( ps.getDoc().getLineInformation ( i ).getOffset ( ), ps.getDoc().getLineInformation ( i ).getLength ( ) );
				strbuf.append ( line.replaceAll ( "\t", getTabSpace ( ) ) + ( i < ps.getEndLineIndex() ? ps.getEndLineDelim() : "" ) );
			}

			// If all goes well, replace the text with the modified information	
			if ( strbuf.toString ( ) != null )
			{
				ps.getDoc().replace ( ps.getStartLine().getOffset ( ), ps.getSelLength(), strbuf.toString ( ) );
				return true;
			}
		}
		catch ( Exception e ) 
		{
			beep( e );
		}	
			
		// In event of problems, return false
		return false;		
	}
}