/*
 * jsLaTeX v1.2 - jQuery plugin
 * 
 *  Copyright (c) 2009 Andreas Grech
 *
 *  Dual licensed under the MIT and GPL licenses:
 *    http://www.opensource.org/licenses/mit-license.php
 *    http://www.gnu.org/licenses/gpl.html
 *
 * http://knowledge-aholic.blogspot.com
 */

(function ($) {
    var attachToImage = function () {
        return $("<img/>").attr({
            src: this.src
        });
    },
        formats = {
        'gif': attachToImage,
        'png': attachToImage,
        'swf': function () {
            return $("<embed/>").attr({
                src: this.src,
                type: 'application/x-shockwave-flash'
            });
        }
    },
        sections = {
        '{f}': 'format',
        '{e}': 'equation'
    },
        escapes = {
        '+': '2B',
        '=': '3D'
    };

    $.fn.latex = function (opts) {
        opts = $.extend({},
        $.fn.latex.defaults, opts);
        opts.format = formats[opts.format] ? opts.format : 'gif';
        return this.each(function () {
            var $this = $(this),
                format, s, element, url = opts.url;
            opts.equation = $.trim($this.text());
            for (s in sections) {
                if (sections.hasOwnProperty(s) && (format = url.indexOf(s)) >= 0) {
                    url = url.replace(s, opts[sections[s]]);
                }
            }
            for (s in escapes) {
                if (escapes.hasOwnProperty(s) && (format = url.indexOf(s)) >= 0) {
                    url = url.replace(s, '%' + escapes[s]);
                }
            }
            opts.src = url;
            element = formats[opts.format].call(opts);
            $this.html('').append(element);
            if (opts.callback) {
                opts.callback.call(element);
            }
        });
    };

    $.fn.latex.defaults = {
        format: 'gif',
        url: 'http://latex.codecogs.com/{f}.latex?{e}'
    };
}(jQuery));