/*
 * 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: {
      date_iso: {
         format: '____-__-__',
         regex:  /\d/
      },
      date_us: {
         format: '__/__/____',
         regex:  /\d/
      },
      time: {
         format: '__:__:__',
         regex:  /\d/
      },
      phone: {
         format: '(___) ___-____',
         regex:  /\d/
      },
      zip: {
         format: '_____-____',
         regex:  /\d/
      },
      month: {
        format: '__',
        regex: /\d/
      },
      year: {
        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 str     = this.value + ch;
            var pos     = str.length;
            if (pos == 1 && mask.format.charAt(pos-1) != '_') {
            	str = mask.format.charAt(pos-1) + this.value + ch;
            }
            if ( mask.regex.test(ch) && pos <= mask.format.length ) {
/*				if ( mask.format.charAt(pos - 1) != ' ' ) */				// Werner Cloete - 02/05/2007 - Commented out the code
				while ( mask.format.charAt(pos) != '_' && pos <= mask.format.length)			// Greg Marshall - 06/08/2007 - Changed the code to use a while loop to allow for multiple placeholders in a row
				{																				// Greg Mashall - 06/08/2007 - part of while loop
/*					str = this.value + mask.format.charAt(pos - 1) + ch; */	// Werner Cloete - 02/05/2007 - Commented out the code
					str = str + mask.format.charAt(pos);		// Werner Cloete - 02/05/2007 - Changed the order in which the strings are concatenated
					pos++;									// Greg Mashall - 06/08/2007 - part of while loop - move through positions
					ch = "";								// Greg Mashall - 06/08/2007 - set chr = "" so we don't keep adding it
				}											// Greg Mashall - 06/08/2007 - end while
               this.value = str;
            }
            Event.stop(event);
         } else {
         	if (key == 8) {
         		var str = this.value;
         		var pos = str.length-1;
				while ( mask.format.charAt(pos) != '_' && pos > 0) {
					str = str.substr(0, str.length-1);
					//alert(str);
					pos--;
				}
				this.value = str;
         	}
         }
      }
   },

   /* 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;
   }
};

	if (window.addEventListener) {
		window.addEventListener("load", Xaprb.InputMask.setupElementMasks, false) //invoke function
	}
	if (window.attachEvent) {
		window.attachEvent("onload", Xaprb.InputMask.setupElementMasks)
	}