/*
 * Ext JS Library 2.2.1
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.form.VTypes
 * This is a singleton object which contains a set of commonly used field validation functions.
 * The validations provided are basic and intended to be easily customizable and extended. To add
 * your own custom VType:<pre><code>
Ext.apply(Ext.form.VTypes, {
    IPAddress:  function(v) {
        return /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(v);
    },
    IPAddressText: 'Must be a numeric IP address'
});
</code></pre>
 * @singleton
 */
Ext.form.VTypes = function(){
    // closure these in so they are only created once.
    var alpha = /^[a-zA-Z_]+$/;
    var alphanum = /^[a-zA-Z0-9_]+$/;
    var email = /^([\w]+)(\.[\w]+)*@([\w\-]+\.){1,5}([A-Za-z]){2,4}$/;
    var url = /(((https?)|(ftp)):\/\/([\-\w]+\.)+\w{2,3}(\/[%\-\w]+(\.\w{2,})?)*(([\w\-\.\?\\\/+@&#;`~=%!]*)(\.\w{2,})?)*\/?)/i;

    // All these messages and functions are configurable
    return {
        /**
         * The function used to validate email addresses.  Note that this is a very basic validation -- complete
         * validation per the email RFC specifications is very complex and beyond the scope of this class, although
         * this function can be overridden if a more comprehensive validation scheme is desired.  See the validation
         * section of the <a href="http://en.wikipedia.org/wiki/E-mail_address">Wikipedia article on email addresses</a> 
         * for additional information.
         * @param {String} value The email address
         */
        'email' : function(v){
            return email.test(v);
        },
        /**
         * The error text to display when the email validation function returns false
         * @type String
         */
        'emailText' : 'This field should be an e-mail address in the format "user@domain.com"',
        /**
         * The keystroke filter mask to be applied on email input.  See the {@link #email} method for 
         * information about more complex email validation.
         * @type RegExp
         */
        'emailMask' : /[a-z0-9_\.\-@]/i,

        /**
         * The function used to validate URLs
         * @param {String} value The URL
         */
        'url' : function(v){
            return url.test(v);
        },
        /**
         * The error text to display when the url validation function returns false
         * @type String
         */
        'urlText' : 'This field should be a URL in the format "http:/'+'/www.domain.com"',
        
        /**
         * The function used to validate alpha values
         * @param {String} value The value
         */
        'alpha' : function(v){
            return alpha.test(v);
        },
        /**
         * The error text to display when the alpha validation function returns false
         * @type String
         */
        'alphaText' : 'This field should only contain letters and _',
        /**
         * The keystroke filter mask to be applied on alpha input
         * @type RegExp
         */
        'alphaMask' : /[a-z_]/i,

        /**
         * The function used to validate alphanumeric values
         * @param {String} value The value
         */
        'alphanum' : function(v){
            return alphanum.test(v);
        },
        /**
         * The error text to display when the alphanumeric validation function returns false
         * @type String
         */
        'alphanumText' : 'This field should only contain letters, numbers and _',
        /**
         * The keystroke filter mask to be applied on alphanumeric input
         * @type RegExp
         */
        'alphanumMask' : /[a-z0-9_]/i
    };
}();