/*
 * Copyright (c) 2007-2008 Josh Bush (digitalbush.com)
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE. 
 */
 
/*
 * Version: 1.1.4
 * Release: 2008-07-29
 * http://digitalbush.com/projects/masked-input-plugin/
 */ 
(function($) {

//Helper Function for Caret positioning
$.fn.caret=function(begin,end){
if(this.length==0) return;
if (typeof begin == 'number') {
 end = (typeof end == 'number')?end:begin; 
return this.each(function(){
if(this.setSelectionRange){
this.focus();
this.setSelectionRange(begin,end);
}else if (this.createTextRange){
var range = this.createTextRange();
range.collapse(true);
range.moveEnd('character', end);
range.moveStart('character', begin);
range.select();
}
});
 } else {
 if (this[0].setSelectionRange){
begin = this[0].selectionStart;
end = this[0].selectionEnd;
}else if (document.selection && document.selection.createRange){
var range = document.selection.createRange();
begin = 0 - range.duplicate().moveStart('character', -100000);
end = begin + range.text.length;
}
return {begin:begin,end:end};
 } 
};

//Predefined character definitions
var charMap={
'9':"[0-9]",
'a':"[A-Za-z]",
'*':"[A-Za-z0-9]"
};

//Helper method to inject character definitions
$.mask={
addPlaceholder : function(c,r){
charMap[c]=r;
}
};

$.fn.unmask=function(){
return this.trigger("unmask");
};

//Main Method
$.fn.mask = function(mask,settings) {
settings = $.extend({
placeholder: "_",
completed: null
}, settings);

//Build Regex for format validation
var re = new RegExp("^"+
$.map( mask.split(""), function(c,i){ 
 return charMap[c]||((/[A-Za-z0-9]/.test(c)?"":"\\")+c);
}).join('')+
"$");

return this.each(function(){
var input=$(this);
var buffer=new Array(mask.length);
var locked=new Array(mask.length);
var valid=false; 
var ignore=false; //Variable for ignoring control keys
var firstNonMaskPos=null; 

//Build buffer layout from mask & determine the first non masked character
$.each( mask.split(""), function(i,c){
locked[i]=(charMap[c]==null);
buffer[i]=locked[i]?c:settings.placeholder;
if(!locked[i] && firstNonMaskPos==null)
firstNonMaskPos=i;
});

function focusEvent(){
checkVal();
writeBuffer();
setTimeout(function(){
$(input[0]).caret(valid?mask.length:firstNonMaskPos);
},0);
};

function keydownEvent(e){
var pos=$(this).caret();
var k = e.keyCode;
ignore=(k < 16 || (k > 16 && k < 32 ) || (k > 32 && k < 41));

//delete selection before proceeding
if((pos.begin-pos.end)!=0 && (!ignore || k==8 || k==46)){
clearBuffer(pos.begin,pos.end);
}
//backspace and delete get special treatment
if(k==8){//backspace
while(pos.begin-->=0){
if(!locked[pos.begin]){
buffer[pos.begin]=settings.placeholder;
if($.browser.opera){
//Opera won't let you cancel the backspace, so we'll let it backspace over a dummy character.
s=writeBuffer();
input.val(s.substring(0,pos.begin)+" "+s.substring(pos.begin));
$(this).caret(pos.begin+1);
}else{
writeBuffer();
$(this).caret(Math.max(firstNonMaskPos,pos.begin));
}
return false;
}
}
}else if(k==46){//delete
clearBuffer(pos.begin,pos.begin+1);
writeBuffer();
$(this).caret(Math.max(firstNonMaskPos,pos.begin));
return false;
}else if (k==27){//escape
clearBuffer(0,mask.length);
writeBuffer();
$(this).caret(firstNonMaskPos);
return false;
}
};

function keypressEvent(e){
if(ignore){
ignore=false;
//Fixes Mac FF bug on backspace
return (e.keyCode == 8)? false: null;
}
e=e||window.event;
var k=e.charCode||e.keyCode||e.which;
var pos=$(this).caret();

if(e.ctrlKey || e.altKey){//Ignore
return true;
}else if ((k>=41 && k<=122) ||k==32 || k>186){//typeable characters
var p=seekNext(pos.begin-1);
if(p<mask.length){
if(new RegExp(charMap[mask.charAt(p)]).test(String.fromCharCode(k))){
buffer[p]=String.fromCharCode(k);
writeBuffer();
var next=seekNext(p);
$(this).caret(next);
if(settings.completed && next == mask.length)
settings.completed.call(input);
}
}
}
return false;
};

function clearBuffer(start,end){
for(var i=start;i<end&&i<mask.length;i++){
if(!locked[i])
buffer[i]=settings.placeholder;
}
};

function writeBuffer(){
return input.val(buffer.join('')).val();
};

function checkVal(){
//try to place charcters where they belong
var test=input.val();
var pos=firstNonMaskPos;
for(var i=0;i<mask.length;i++){
if(!locked[i]){
buffer[i]=settings.placeholder;
while(pos++<test.length){
//Regex Test each char here.
var reChar=new RegExp(charMap[mask.charAt(i)]);
if(test.charAt(pos-1).match(reChar)){
buffer[i]=test.charAt(pos-1);
break;
}
}
}
}
var s=writeBuffer();
if(!s.match(re)){
input.val("");
clearBuffer(0,mask.length);
valid=false;
}else
valid=true;
};

function seekNext(pos){
while(++pos<mask.length){
if(!locked[pos])
return pos;
}
return mask.length;
};

input.one("unmask",function(){
input.unbind("focus",focusEvent);
input.unbind("blur",checkVal);
input.unbind("keydown",keydownEvent);
input.unbind("keypress",keypressEvent);
if ($.browser.msie) 
this.onpaste= null; 
else if ($.browser.mozilla)
this.removeEventListener('input',checkVal,false);
});
input.bind("focus",focusEvent);
input.bind("blur",checkVal);
input.bind("keydown",keydownEvent);
input.bind("keypress",keypressEvent);
//Paste events for IE and Mozilla thanks to Kristinn Sigmundsson
if ($.browser.msie) 
this.onpaste= function(){setTimeout(checkVal,0);}; 
else if ($.browser.mozilla)
this.addEventListener('input',checkVal,false);

checkVal();//Perform initial check for existing values
});
};
})(jQuery);