/*
 * Metadata - jQuery plugin for parsing metadata from elements
 *
 * Copyright (c) 2006 John Resig, Yehuda Katz, Jörn Zaefferer, Paul McLanahan
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.metadata.js 3640 2007-10-11 18:34:38Z pmclanahan $
 *
 */

/**
 * Sets the type of metadata to use. Metadata is encoded in JSON, and each property
 * in the JSON will become a property of the element itself.
 *
 * There are three supported types of metadata storage:
 *
 *   attr:  Inside an attribute. The name parameter indicates *which* attribute.
 *          
 *   class: Inside the class attribute, wrapped in curly braces: { }
 *   
 *   elem:  Inside a child element (e.g. a script tag). The
 *          name parameter indicates *which* element.
 *          
 * The metadata for an element is loaded the first time the element is accessed via jQuery.
 *
 * As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
 * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
 * 
 * @name $.metadata.setType
 *
 * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
 * @before $.metadata.setType("class")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
 * @desc Reads metadata from the class attribute
 * 
 * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
 * @before $.metadata.setType("attr", "data")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
 * @desc Reads metadata from a "data" attribute
 * 
 * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
 * @before $.metadata.setType("elem", "script")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
 * @desc Reads metadata from a nested script element
 * 
 * @param String type The encoding type
 * @param String name The name of the attribute to be used to get metadata (optional)
 * @cat Plugins/Metadata
 * @descr Sets the type of encoding to be used when loading metadata for the first time
 * @type undefined
 * @see metadata()
 */

(function($) {

$.extend({
	metadata : {
		defaults : {
			type: 'class',
			name: 'metadata',
			cre: /({.*})/,
			single: 'metadata'
		},
		setType: function( type, name ){
			this.defaults.type = type;
			this.defaults.name = name;
		},
		get: function( elem, opts ){
			var settings = $.extend({},this.defaults,opts);
			// check for empty string in single property
			if ( !settings.single.length ) settings.single = 'metadata';
			
			var data = $.data(elem, settings.single);
			// returned cached data if it already exists
			if ( data ) return data;
			
			data = "{}";
			
			if ( settings.type == "class" ) {
				var m = settings.cre.exec( elem.className );
				if ( m )
					data = m[1];
			} else if ( settings.type == "elem" ) {
				if( !elem.getElementsByTagName ) return;
				var e = elem.getElementsByTagName(settings.name);
				if ( e.length )
					data = $.trim(e[0].innerHTML);
			} else if ( elem.getAttribute != undefined ) {
				var attr = elem.getAttribute( settings.name );
				if ( attr )
					data = attr;
			}
			
			if ( data.indexOf( '{' ) <0 )
			data = "{" + data + "}";
			
			data = eval("(" + data + ")");
			
			$.data( elem, settings.single, data );
			return data;
		}
	}
});

/**
 * Returns the metadata object for the first member of the jQuery object.
 *
 * @name metadata
 * @descr Returns element's metadata object
 * @param Object opts An object contianing settings to override the defaults
 * @type jQuery
 * @cat Plugins/Metadata
 */
$.fn.metadata = function( opts ){
	return $.metadata.get( this[0], opts );
};

})(jQuery);




/**
 * JSON - Used to encode objects into JSON
 */

(function ($) {
    var m = {
            '\b': '\\b',
            '\t': '\\t',
            '\n': '\\n',
            '\f': '\\f',
            '\r': '\\r',
            '"' : '\\"',
            '\\': '\\\\'
        },
        s = {
            'array': function (x) {
                var a = ['['], b, f, i, l = x.length, v;
                for (i = 0; i < l; i += 1) {
                    v = x[i];
                    f = s[typeof v];
                    if (f) {
                        v = f(v);
                        if (typeof v == 'string') {
                            if (b) {
                                a[a.length] = ',';
                            }
                            a[a.length] = v;
                            b = true;
                        }
                    }
                }
                a[a.length] = ']';
                return a.join('');
            },
            'boolean': function (x) {
                return String(x);
            },
            'null': function (x) {
                return "null";
            },
            'number': function (x) {
                return isFinite(x) ? String(x) : 'null';
            },
            'object': function (x) {
                if (x) {
                    if (x instanceof Array) {
                        return s.array(x);
                    }
                    var a = ['{'], b, f, i, v;
                    for (i in x) {
                        v = x[i];
                        f = s[typeof v];
                        if (f) {
                            v = f(v);
                            if (typeof v == 'string') {
                                if (b) {
                                    a[a.length] = ',';
                                }
                                a.push(s.string(i), ':', v);
                                b = true;
                            }
                        }
                    }
                    a[a.length] = '}';
                    return a.join('');
                }
                return 'null';
            },
            'string': function (x) {
                if (/["\\\x00-\x1f]/.test(x)) {
                    x = x.replace(/([\x00-\x1f\\"])/g, function(a, b) {
                        var c = m[b];
                        if (c) {
                            return c;
                        }
                        c = b.charCodeAt();
                        return '\\u00' +
                            Math.floor(c / 16).toString(16) +
                            (c % 16).toString(16);
                    });
                }
                return '"' + x + '"';
            }
        };

	$.toJSON = function(v) {
		var f = isNaN(v) ? s[typeof v] : s['number'];
		if (f) return f(v);
	};
	
	$.parseJSON = function(v, safe) {
		if (safe === undefined) safe = $.parseJSON.safe;
		if (safe && !/^("(\\.|[^"\\\n\r])*?"|[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t])+?$/.test(v))
			return undefined;
		return eval('('+v+')');
	};
	
	$.parseJSON.safe = false;

})(jQuery);