ব্যবহারকারী:Pasaban/common.js

/******************************************

    This file is part of Bangla Unicode Web Tools.

    Bangla Unicode Web Tools 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.

    Bangla Unicode Web Tools 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 Bangla Unicode Web Tools; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


	Contains common utilities to:
	1. Insert and Remove character into
	   text area.
	2. Hide and show any div element
	3. Determine bangla character category
	4. Find equivalent kar to sorborno mapping

	Author: S M Mahbub Murshed
	Copyright: S M Mahbub Murshed
	Email: udvranto@yahoo.com
	Version: 1.2.0
	Date: September 06, 2006, XX:XX GMT
*******************************************/




/******************************************
******************************************
      General utility to insert
      text into the cursor position
******************************************
*******************************************/


/******************************************
	Function to insert a character into the text area.

	\param text The string or character to insert

	Coded by : Arup Kamal
	Date: August 26, 2006 (approx)
*******************************************/
function Insert(field, text)
{
	if (document.selection) 
	{
		field.focus();
		sel = document.selection.createRange();
		sel.text = text;
		sel.collapse(true);
		sel.select();
	}

	else if (field.selectionStart || field.selectionStart == '0')
	{

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

} // end function Insert





/******************************************
	Function to delete a set of 
	character and insert a set of characters
	into the text area.

	\param value The string or character to insert
	\param len	Number of characters to delete from current cursor position

	Coded by : Arup Kamal
	Date: August 26, 2006 (approx)
*******************************************/
function RemoveNInsert(field, value, len) 
{
	if (document.selection) 
	{
		field.focus();
		sel = document.selection.createRange();
		if (field.value.length >= len)
			{ 			
			sel.moveStart('character', -1*(len));   
			}
		sel.text = value;
		sel.collapse(true);
		sel.select();
		}

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

} // end function RemoveNInsert





/******************************************
	Function to detect caps lock
	Returns true if caps lock is on

	\param e The keypress event

	Coded by : http://www.howtocreate.co.uk/jslibs/htmlhigh/capsDetect.html
	Date: Sepetember 11, 2006
*******************************************/
function capsDetect( e )
{
	if( !e ) e = window.event;
	if( !e ) return false;
	//what (case sensitive in good browsers) key was pressed
	var theKey = e.which ? e.which : ( e.keyCode ? e.keyCode : ( e.charCode ? e.charCode : 0 ) );
	//was the shift key was pressed
	var theShift = e.shiftKey || ( e.modifiers && ( e.modifiers & 4 ) ); //bitWise AND
	//if upper case, check if shift is not pressed. if lower case, check if shift is pressed
	return ( ( theKey > 64 && theKey < 91 && !theShift ) || ( theKey > 96 && theKey < 123 && theShift ) );
}




/******************************************
      General utility to show
      or hide a div element
*******************************************/




/******************************************
	Hides an html div element

	\param id the id of the html element

	Coded by : (Lost the URL where I obtained it from)
	Date: September 05, 2006
*******************************************/
function HideDIV(id)
{
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
} // end function hidediv





/******************************************
	Shows an html div element

	\param id the id of the html element

	Coded by : (Lost the URL where I obtained it from)
	Date: September 05, 2006
*******************************************/
function ShowDIV(id)
{
	//safe function to show an element with a specified id
		  
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
} // end function showdiv





/******************************************
*******************************************
      Bangla unicode utility
*******************************************
*******************************************/





/******************************************
	Determines whether the unicode
	character is an bangla digit
	character or not.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaDigit(CUni)
{
	if(CUni=='০' || CUni=='১'
	|| CUni=='২' || CUni=='৩'
	|| CUni=='৪' || CUni=='৫'
	|| CUni=='৬' || CUni=='৭'
	|| CUni=='৮' || CUni=='৯')
		return true;

	return false;
} // end function IsBanglaDigit







/******************************************
	Determines whether the unicode
	character is a bangla pre kar
	character or not. Pre kar
	character are appended BEFORE
	a banjonborno or juktakhor character
	after rendering.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaPreKar(CUni)
{
	if(CUni=='ি' || CUni=='ৈ' 
	|| CUni=='ে' )
		return true;
	
	return false;
} // end function IsBanglaPreKar





/******************************************
	Determines whether the unicode
	character is a bangla post kar
	character or not. Post kar
	character are appended AFTER
	a banjonborno or juktakhor character
	after rendering.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaPostKar(CUni)
{
	if(CUni == 'া' || CUni=='ো'
	|| CUni=='ৌ' || CUni=='ৗ' || CUni=='ু'
	|| CUni=='ূ' || CUni=='ী'
	|| CUni=='ৃ')
		return true;
	return false;
} // end function IsBanglaPostKar




/******************************************
	Determines whether the unicode
	character is a bangla kar
	character or not. Its a super
	set or Pre and Post kars.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaKar(CUni)
{
	if(IsBanglaPreKar(CUni) || IsBanglaPostKar(CUni) )
		return true;
	return false;

} // end function IsBanglaKar






/******************************************
	Determines whether the unicode
	character is a bangla banjonborno
	character or not.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaBanjonborno(CUni)
{
	if(CUni=='ক' || CUni=='খ' || CUni=='গ' || CUni=='ঘ' || CUni=='ঙ' 
        || CUni=='চ' || CUni=='ছ' || CUni=='জ' || CUni=='ঝ' || CUni=='ঞ' 
        || CUni=='ট' || CUni=='ঠ' || CUni=='ড' || CUni=='ঢ' || CUni=='ণ'
        || CUni=='ত' || CUni=='থ' || CUni=='দ' || CUni=='ধ' || CUni=='ন'
        || CUni=='প' || CUni=='ফ' || CUni=='ব' || CUni=='ভ' || CUni=='ম'
        || CUni=='শ' || CUni=='ষ' || CUni=='স' || CUni=='হ' 
	|| CUni=='য' || CUni=='র' || CUni=='ল' || CUni=='য়' 
	|| CUni=='ং' || CUni=='ঃ' || CUni=='ঁ'
	|| CUni=='ৎ')
		return true;

	return false;
} // end function IsBanglaBanjonborno




/******************************************
	Determines whether the unicode
	character is a bangla soroborno
	character or not.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaSoroborno(CUni)
{
	if(CUni == 'অ' || CUni=='আ'
	|| CUni=='ই' || CUni=='ঈ'
	|| CUni=='উ' || CUni=='ঊ'
	|| CUni=='ঋ' || CUni=='ঌ'
	|| CUni=='এ' || CUni=='ঐ' 
	|| CUni=='ও' || CUni=='ঔ' )
		return true;

	return false;
} // end function IsBanglaSoroborno





/******************************************
	Determines whether the unicode
	character is a bangla nukta
	character or not.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaNukta(CUni)
{
	if(CUni=='ং' || CUni=='ঃ' || CUni=='ঁ')
		return true;

	return false;

} // end function IsBanglaNukta






/******************************************
	Determines whether the unicode
	character is a bangla ja fola or ra fola
	character or not.

	\param CUni The Unicode string

	Coded by : S M Mahbub Murshed
	Date: August 30, 2006
*******************************************/
function IsBanglaFola(CUni)
{
	if(CUni=="্য" || CUni=="্র")
		return true;

	return false;
} // end function IsBanglaFola






/******************************************
	Determines whether the unicode
	character is a bangla halant
	character or not.

	\param CUni The Unicode character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsBanglaHalant(CUni)
{
	if(CUni=='্')
		return true;

	return false;
} // end function IsBanglaHalant




/******************************************
	Determines whether the
	character is a space
	character or not.

	\param C The character

	Coded by : S M Mahbub Murshed
	Date: August 28, 2006
*******************************************/
function IsSpace(C)
{
	if( C==' ' ||  C=='\t' || C=='\n'
	||  C=='\r')
		return true;

	return false;
} // end function IsSpace



/******************************************
	Maps an unicode character to its
	equivalent soroborno

	\param CUni The Unicode kar character to map with

	Coded by : S M Mahbub Murshed
	Date: August 30, 2006
*******************************************/
function MapKarToSorborno(CUni)
{
	var CSorborno = CUni;
	if(CUni=='া')
		CSorborno = 'আ';
	else if(CUni=='ি')
		CSorborno = 'ই';
	else if(CUni=='ী')
		CSorborno = 'ঈ';
	else if(CUni=='ু')
		CSorborno = 'উ';
	else if(CUni=='ূ')
		CSorborno = 'ঊ';
	else if(CUni=='ৃ')
		CSorborno = 'ঋ';
	else if(CUni=='ে')
		CSorborno = 'এ';
	else if(CUni=='ৈ')
		CSorborno = 'ঐ';
	else if(CUni=='ো')
		CSorborno = 'ও';
	else if(CUni=="ো")
		CSorborno = 'ও';
	else if(CUni=='ৌ')
		CSorborno = 'ঔ';
	else if(CUni=="ৌ")
		CSorborno = 'ঔ';


	return CSorborno;
} // end function MapKarToSorborno





/******************************************
	Maps an unicode soroborono to its
	equivalent kar

	\param CUni The Unicode sorborno character to map with

	Coded by : S M Mahbub Murshed
	Date: August 30, 2006
*******************************************/
function MapSorbornoToKar(CUni)
{
	var CKar = CUni;
	if(CUni=='আ')
		CKar = 'া';
	else if(CUni=='ই')
		CKar = 'ি';
	else if(CUni=='ঈ')
		CKar = 'ী';
	else if(CUni=='উ')
		CKar = 'ু';
	else if(CUni=='ঊ')
		CKar = 'ূ';
	else if(CUni=='ঋ')
		CKar = 'ৃ';
	else if(CUni=='এ')
		CKar = 'ে';
	else if(CUni=='ঐ')
		CKar = 'ৈ';
	else if(CUni=='ও')
		CKar = 'ো';
	else if(CUni=='ঔ')
		CKar = 'ৌ';

	return CKar;
} // end function MapSorbornoToKar