bijoyunicode.js

/**
 * Unicode unijoy Parser for writing in webpages
 * This script helps to write unicode bangla using unijoy (or bijoy) keyboard mapping
 *
 * @name Unijoy Unicode Parser
 * @version 1.0 [Date 26th August, 2006]
 * @author Hasin Hayder. Visit My Homepage at http://hasin.wordpress.com
 * @license LGPL
 */

/**
 * This script is released under Lesser GNU Public License [LGPL]
 * which implies that you are free to use this script in your
 * web applications without any problem. No warranty ensured. If you like
 * this script, Please acknowledge by keeping a link to my website
 * http://hasin.wordpress.com in the page where you use this script.
 */

// Set of Characters
var activeta; //active text area
var unijoy=new Array();

// unijoy bangla equivalents
unijoy['j'] = "\u0995"; // ko

unijoy['d']='\u09BF'; // hrossho i kar
unijoy['gd']='\u0987'; // hrossho i
unijoy['D']='\u09C0'; // dirgho i kar
unijoy['gD']='\u0988'; // dirgho i
unijoy['c']='\u09C7'; // e kar
unijoy['gc'] = '\u098F'; // E
unijoy['gs'] = '\u0989'; // hrossho u
unijoy['s'] = '\u09C1'; // hrossho u kar
unijoy['S'] = '\u09C2'; // dirgho u kar
unijoy['gS'] = '\u098A'; // dirgho u
unijoy['v']='\u09B0'; // ro
unijoy['a']='\u098B'; // wri
unijoy['f']='\u09BE'; // a kar
unijoy['gf'] = '\u0986'; //shore a
unijoy['F']='\u0985'; // shore ao
//unijoy['ao']='\u0985'; // shore o
unijoy['n']='\u09B8'; // dontyo so
unijoy['t']='\u099f'; // to
unijoy['J'] = '\u0996'; // Kho

//unijoy['kh'] = '\u0996'; // kho

unijoy['b']='\u09A8'; // dontyo no
unijoy['B']='\u09A3'; // murdhonyo no
unijoy['k']='\u09A4'; // tto
unijoy['K']='\u09A5'; // ttho

unijoy['e']='\u09A1'; // ddo
unijoy['E']='\u09A2'; // ddho

unijoy['h']='\u09AC'; // bo
unijoy['H']='\u09AD'; // bho
//unijoy['v']='\u09AD'; // bho
//unijoy['rh']='o';  // doye bindu ro
unijoy['p']='\u09DC';    // doye bindu ro
unijoy['P']='\u09DD';    // dhoye bindu ro
unijoy['o']='\u0997';   // go
unijoy['O']='\u0998';   // gho

//unijoy['gh']='\u0998'; // gho

unijoy['i']='\u09B9';   // ho
unijoy['I']='\u099E';   // yo
unijoy['u']='\u099C';   // borgio jo
unijoy['U']='\u099D'; // jho
//unijoy['jh']='\u099D'; // jho
unijoy['y']='\u099A'; //  cho
unijoy['Y']='\u099B'; // cho
//unijoy['C']='\u099B'; // ccho
unijoy['T']='\u09A0'; // tho
unijoy['r']='\u09AA'; // po
unijoy['R']='\u09AB'; // fo
//unijoy['ph']='\u09AB'; // fo
unijoy['l']='\u09A6'; // do
unijoy['L']='\u09A7'; // dho

unijoy['w']='\u09AF';// ontoshyo zo
unijoy['W']='\u09DF';   // ontostho yo
unijoy['q']='\u0999';   // Uma
unijoy['Q']='\u0982';   // uniswor
unijoy['V']='\u09B2';   // lo
unijoy['m']='\u09AE';   // mo
unijoy['M']='\u09B6';   // talobyo sho
unijoy['N']='\u09B7'; // mordhonyo sho
unijoy['gx']= '\u0993';//'\u09CB'; // o
unijoy['X']='\u09CC'; // ou kar
unijoy['gX']='\u0994'; // OU
//unijoy['Ou']='\u0994'; // OU
unijoy['gC']='\u0990'; // Oi
//unijoy['\\']='\u09CE'; // tto
//unijoy['|']='\u0983'; // bisworgo
unijoy["G"] ="\u0964"; // dari
//unijoy[".."] = "."; // fullstop
unijoy['g'] = ' ';//'\u09CD' + '\u200c'; // hosonto
unijoy['&'] = '\u0981'; // chondrobindu
unijoy['Z'] ='\u09CD'+'\u09AF'; // jo fola
unijoy['gh'] ='\u09CD'+ '\u09AC'; // bo fola
unijoy['ga'] ='\u098B';// wri kar
unijoy['a'] ='\u09C3'; // wri
//unijoy['k'] ="\u0995"  + '\u09CD'+ '\u09B8';
unijoy['rZ'] = unijoy['r']+ '\u200c'+ '\u09CD'+'\u09AF';
unijoy['z'] =  '\u09CD'+ unijoy['v'];
unijoy['x'] = '\u09CB';
unijoy['C'] = '\u09C8'; //Oi Kar
unijoy['\\'] = '\u0983';
unijoy['|']='\u09CE'; // bisworgo




var carry = '';  //This variable stores each keystrokes
var old_len =0; //This stores length parsed bangla charcter
var ctrlPressed=false;
var first_letter = false;
var lastInserted;

isIE=document.all? 1:0;
var switched=false;

function checkKeyDown(ev)
{
    //just track the control key
    var e = (window.event) ? event.keyCode : ev.which;
    if (e=='17')
    {
        ctrlPressed = true;
    }
}

function checkKeyUp(ev)
{
    //just track the control key
    var e = (window.event) ? event.keyCode : ev.which;
    if (e=='17')
    {
        ctrlPressed = false;
        //alert(ctrlPressed);
    }

}


function parseunijoy(evnt)
{
    // main unijoy parser
    var t = document.getElementById(activeta); // the active text area
    var e = (window.event) ? event.keyCode : evnt.which; // get the keycode

    if (e=='113')
    {
        //switch the keyboard mode
        if(ctrlPressed){
            switched = !switched;
            //alert("H"+switched);
            return true;
        }
    }

    if (switched) return true;

    if(ctrlPressed)
    {
        // user is pressing control, so leave the parsing
        e=0;
    }

    var char_e = String.fromCharCode(e); // get the character equivalent to this keycode

    if(e==8 || e==32)
    {
        // if space is pressed we have to clear the carry. otherwise there will be some malformed conjunctions
        carry = " ";
        old_len = 1;
        return;
    }

    lastcarry = carry;
    carry += "" + char_e;    //append the current character pressed to the carry

    bangla = parseunijoyCarry(carry); // get the combined equivalent
    tempBangla = parseunijoyCarry(char_e); // get the single equivalent

    if (tempBangla == ".." || bangla == "..") //that means it has sibling
    {
        return false;
    }
    if (char_e=="g")
    {
        if(carry=="gg")
        {
            // check if it is a plus sign
            insertConjunction('\u09CD' + '\u200c',old_len);
            old_len=1;
            return false;
        }
        //otherwise this is a simple joiner
        insertAtCursor("\u09CD");old_len = 1;
        carry="g";
        return false;
    }

    else if(old_len==0) //first character
    {
        // this is first time someone press a character
        insertConjunction(bangla,1);
        old_len=1;
        return false;

    }

    else if(char_e=="A")
    {
        //process old style ref
        newChar = unijoy['v']+ '\u09CD' + lastInserted;
        insertConjunction(newChar, lastInserted.length );
        old_len = lastInserted.length;
        return false;
    }


    else if((bangla == "" && tempBangla !="")) //that means it has no joint equivalent
    {

        // there is no joint equivalent - so show the single equivalent.
        bangla = tempBangla;
        if (bangla=="")
        {
            // there is no available equivalent - leave as is
            carry ="";
            return;
        }

        else
        {
            // found one equivalent
            carry = char_e;
            insertAtCursor(bangla);
            old_len = bangla.length;
            return false;
        }
    }
    else if(bangla!="")//joint equivalent found
    {
        // we have found some joint equivalent process it

        insertConjunction(bangla, old_len);
        old_len = bangla.length;
        return false;
    }
}

    function parseunijoyCarry(code)
    {
    //this function just returns a bangla equivalent for a given keystroke
    //or a conjunction
    //just read the array - if found then return the bangla eq.
    //otherwise return a null value
        if (!unijoy[code])  //Oh my god :-( no bangla equivalent for this keystroke

        {
            return ''; //return a null value
        }
        else
        {
            return ( unijoy[code]);  //voila - we've found bangla equivalent
        }

    }


function insertAtCursor(myValue) {
    /**
     * this function inserts a character at the current cursor position in a text area
     * many thanks to alex king and phpMyAdmin for this cool function
     *
     * This function is originally found in phpMyAdmin package and modified by Hasin Hayder to meet the requirement
     */
    lastInserted = myValue;
    var myField = document.getElementById(activeta);
    if (document.selection) {
        //alert("hello2");
        myField.focus();
        sel = document.selection.createRange();
        sel.text = myValue;
        sel.collapse(true);
        sel.select();
    }
    //MOZILLA/NETSCAPE support
    else if (myField.selectionStart || myField.selectionStart == 0) {

        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        var scrollTop = myField.scrollTop;
        startPos = (startPos == -1 ? myField.value.length : startPos );
        myField.value = myField.value.substring(0, startPos)
        + myValue
        + myField.value.substring(endPos, myField.value.length);
        myField.focus();
        myField.selectionStart = startPos + myValue.length;
        myField.selectionEnd = startPos + myValue.length;
        myField.scrollTop = scrollTop;
    } else {
        var scrollTop = myField.scrollTop;
        myField.value += myValue;
        myField.focus();
        myField.scrollTop = scrollTop;
    }
}

function insertConjunction(myValue, len) {
    /**
     * this function inserts a conjunction and removes previous single character at the current cursor position in a text area
     *
     * This function is derived from the original one found in phpMyAdmin package and modified by Hasin to meet our need
     */
    //alert(len);
    lastInserted = myValue;
    var myField = document.getElementById(activeta);
    if (document.selection) {
        myField.focus();
        sel = document.selection.createRange();
        if (myField.value.length >= len){  // here is that first conjunction bug in IE, if you use the > operator
            sel.moveStart('character', -1*(len));
            //sel.moveEnd('character',-1*(len-1));
        }
        sel.text = myValue;
        sel.collapse(true);
        sel.select();
    }
    //MOZILLA/NETSCAPE support
    else if (myField.selectionStart || myField.selectionStart == 0) {
        myField.focus();
        var startPos = myField.selectionStart-len;
        var endPos = myField.selectionEnd;
        var scrollTop = myField.scrollTop;
        startPos = (startPos == -1 ? myField.value.length : startPos );
        myField.value = myField.value.substring(0, startPos)
        + myValue
        + myField.value.substring(endPos, myField.value.length);
        myField.focus();
        myField.selectionStart = startPos + myValue.length;
        myField.selectionEnd = startPos + myValue.length;
        myField.scrollTop = scrollTop;
    } else {
        var scrollTop = myField.scrollTop;
        myField.value += myValue;
        myField.focus();
        myField.scrollTop = scrollTop;
    }
    //document.getElementById("len").innerHTML = len;
}

function makeUnijoyEditor(textAreaId)
{
    activeTextAreaInstance = document.getElementById(textAreaId);
    activeTextAreaInstance.onkeypress = parseunijoy;
    activeTextAreaInstance.onkeydown = checkKeyDown;
    activeTextAreaInstance.onkeyup = checkKeyUp;
    activeTextAreaInstance.onfocus = function(){activeta=textAreaId;};
}