// $Id: RTSTransformer.js,v 1.2 2005/09/25 14:52:28 vnagarjuna Exp $ -->

//Copyright 2005 Nagarjuna Venna <vnagarjuna@yahoo.com>

/* ****** BEGIN LICENSE BLOCK ***** 
 *  This file is part of Padma.
 *
 *  Padma is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.

 *  Padma is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Padma; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * ***** END LICENSE BLOCK ***** */

//RTS Modes
RTSTransformer.rtsEnglish = 0;
RTSTransformer.rtsTelugu  = 1;


function RTSTransformer(input, output)
{
    this.input = input;
    this.output = output;
    this.rtsMode = RTSTransformer.rtsEnglish;
}

function RTSTransformer_setRTSMode(mode)
{
    if (mode != RTSTransformer.rtsEnglish && mode != RTSTransformer.rtsTelugu)
        return false;
    this.rtsMode = mode;
    return true;
}

function RTSTransformer_parse(text)
{
    var parser = new RTSParser(text);
    var output = "";

    while (parser.more())
        output += this.toOutputFormat(parser.next());

    return output;
}

function RTSTransformer_convert(text)
{
    if (this.rtsMode != RTSTransformer.rtsEnglish && this.rtsMode != RTSTransformer.rtsTelugu) {
        alert("Invalid RTS mode " + this.rtsMode);
        this.rtsMode = 0;
    }

    var output = "";
    var next = 0;

    do {
        var hash = text.indexOf('#', next);
        if (hash == next) {
            hash = text.indexOf('#', hash + 1);
            if (hash != -1) {
                //Mode remains unchanged because we process text between hashes here
                if (this.rtsMode == RTSTransformer.rtsEnglish)
                    output += this.parse(text.substring(next + 1, hash));
                else output += text.substring(next + 1, hash);
            }
            else {
                //mode changes because there is no terminating hash
                if (this.rtsMode == RTSTransformer.rtsEnglish) {
                    this.rtsMode = RTSTransformer.rtsTelugu;
                    output += this.parse(text.substring(next + 1));
                }
                else {
                    this.rtsMode = RTSTransformer.rtsEnglish;
                    output += text.substring(next + 1);
                }
            }
            next = hash + 1;
        }
        //don't change the mode yet because it will be done when it is matched the next time around
        else if (hash != -1) {
            if (this.rtsMode == RTSTransformer.rtsEnglish)
                output += text.substring(next, hash);
            else output += this.parse(text.substring(next, hash));
            next = hash;
        }
        //Mode reamins the same because there are no more hashes
        else {
            if (this.rtsMode == RTSTransformer.rtsEnglish)
                output += text.substring(next);
            else output += this.parse(text.substring(next));
        }
    } while (hash != -1 && hash < text.length);
    //alert(output);
    return output;
}

//This doesn't seem to work in extension mode, add any mods to relationships.js too
RTSTransformer.prototype = new Transformer(Transformer.method_RTS, Transformer.method_Unicode);
RTSTransformer.prototype.convert = RTSTransformer_convert;
RTSTransformer.prototype.setRTSMode = RTSTransformer_setRTSMode;
RTSTransformer.prototype.parse = RTSTransformer_parse;