/*
 * Copyright (C) 2006 Baron Schwartz <baron at xaprb dot com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, version 2.1.
 *
 * This program 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 Lesser General Public License for more
 * details.
 *
 * $Id: html-form-input-mask.js,v 1.6 2006-11-03 04:04:29 baron Exp $
 */





/* Set up a global Xaprb object to act as the Xaprb namespace, without colliding
 * with other Xaprb scripts.
 */
if ( typeof(Xaprb) == 'undefined' ) {
   Xaprb = new Object();
}

/* The Xaprb.InputMask object acts as the namespace for input masking
 * functionality.
 */
Xaprb.InputMask = {

   /* Each mask has a format and regex property.  The format consists
    * of spaces and non-spaces.  A space is a placeholder for a value the user
    * enters.  A non-space is a literal character that gets copied to that
    * position in the value.  The regex is used to validate each character, one
    * at a time (it is not applied against the entire value in the form field,
    * just the characters the user enters).
    *
    * The way you name your masks is significant.  If you create a mask called
    * date_us, you cause it to be applied to a form field by a) adding the
    * input_mask class to that form field, which triggers this script to treat
    * it specially, and b) adding the class mask_date_us to the form field,
    * which causes this script to apply the date_us mask to it.
    */
   masks: {
      numbers: {
         format: '   .   .   .   .   .',
         regex:  /\d/
      }
   },

   /* Finds every element with class input_mask and applies masks to them.
    */
   setupElementMasks: function() {
      if ( document.getElementsByClassName ) { // Requires the Prototype library
         document.getElementsByClassName('input_mask').each(function(item) {
            Event.observe(item, 'keypress',
               Xaprb.InputMask.applyMask.bindAsEventListener(item), true);
         });
      }
   },
   

   /* This is triggered when the key is pressed in the form input.  It is
    * bound to the element, so 'this' is the input element.
    */
   applyMask: function(event) {
      var match = /mask_(\w+)/.exec(this.className);
      if ( match.length == 2 && Xaprb.InputMask.masks[match[1]] ) {
         var mask = Xaprb.InputMask.masks[match[1]];
	
	var key  = Xaprb.InputMask.getKey(event);

         if ( Xaprb.InputMask.isPrintable(key) ) {
            var ch      = String.fromCharCode(key);
	    var org     = this.value;
            var str     = this.value + ch;
            var cnt;
	    for(cnt = 0; cnt < 10; cnt++)
	    	str = str.replace(".", "");
            var pos     = str.length;
            var i = 0;
	    var e = 0;
	    var buf = "";
	    for(i = pos - 1; i >=0; i--)
	    {	
		if(e == 3) 
		{
			buf = str.charAt(i) + '.' + buf;
			e = 0;
		}
		else buf = str.charAt(i) + buf;
		
		e++;
		
	    } 
            //str = this.value + mask.format.charAt(pos - 1) + ch;
            this.value = buf;
            
            Event.stop(event);
         }
      }
   },

   /* Returns true if the key is a printable character.
    */
   isPrintable: function(key) {
      return ( key >= 32 && key < 127 );
   },

   /* Returns the key code associated with the event.
    */
   getKey: function(e) {
      return window.event ? window.event.keyCode
           : e            ? e.which
           :                0;
   }
};