/*
 * 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: 'https://latex.codecogs.com/{f}.latex?{e}'
  };
}(jQuery));