jquery.localize.js

/*
Copyright (c) Jim Garvin (http://github.com/coderifous), 2008.
Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses.
Written by Jim Garvin (@coderifous) for use on LMGTFY.com.
http://github.com/coderifous/jquery-localize
Based off of Keith Wood's Localisation jQuery plugin.
http://keith-wood.name/localisation.html
 */
(function($) {
  var normaliseLang;
  normaliseLang = function(lang) {
    lang = lang.replace(/_/, '-').toLowerCase();
    if (lang.length > 3) {
      lang = lang.substring(0, 3) + lang.substring(3).toUpperCase();
    }
    return lang;
  };
  $.defaultLanguage = normaliseLang(navigator.language || navigator.userLanguage);
  $.localize = function(pkg, options) {
    var defaultCallback, fileExtension, intermediateLangData, jsonCall, lang, loadLanguage, localizeElement, localizeForSpecialKeys, localizeImageElement, localizeInputElement, localizeOptgroupElement, notifyDelegateLanguageLoaded, regexify, setAttrFromValueForKey, setTextFromValueForKey, valueForKey, wrappedSet;
    if (options == null) {
      options = {};
    }
    wrappedSet = this;
    intermediateLangData = {};
    fileExtension = options.fileExtension || "json";
    loadLanguage = function(pkg, lang, level) {
      var file;
      if (level == null) {
        level = 1;
      }
      switch (level) {
        case 1:
          intermediateLangData = {};
          if (options.loadBase) {
            file = pkg + ("." + fileExtension);
            return jsonCall(file, pkg, lang, level);
          } else {
            return loadLanguage(pkg, lang, 2);
          }
          break;
        case 2:
          if (lang.length >= 2) {
            file = "" + pkg + "-" + (lang.substring(0, 2)) + "." + fileExtension;
            return jsonCall(file, pkg, lang, level);
          }
          break;
        case 3:
          if (lang.length >= 5) {
            file = "" + pkg + "-" + (lang.substring(0, 5)) + "." + fileExtension;
            return jsonCall(file, pkg, lang, level);
          }
      }
    };
    jsonCall = function(file, pkg, lang, level) {
      var ajaxOptions, errorFunc, successFunc;
      if (options.pathPrefix != null) {
        file = "" + options.pathPrefix + "/" + file;
      }
      successFunc = function(d) {
        $.extend(intermediateLangData, d);
        notifyDelegateLanguageLoaded(intermediateLangData);
        return loadLanguage(pkg, lang, level + 1);
      };
      errorFunc = function() {
        if (level < 3) {
          loadLanguage(pkg, lang, level + 1);
        }
        if (options.fallback && options.fallback !== lang) {
          return loadLanguage(pkg, options.fallback);
        }
      };
      ajaxOptions = {
        url: file,
        dataType: "json",
        async: false,
        timeout: options.timeout != null ? options.timeout : 500,
        success: successFunc,
        error: errorFunc
      };
      if (window.location.protocol === "file:") {
        ajaxOptions.error = function(xhr) {
          return successFunc($.parseJSON(xhr.responseText));
        };
      }
      return $.ajax(ajaxOptions);
    };
    notifyDelegateLanguageLoaded = function(data) {
      if (options.callback != null) {
        return options.callback(data, defaultCallback);
      } else {
        return defaultCallback(data);
      }
    };
    defaultCallback = function(data) {
      $.localize.data[pkg] = data;
      return wrappedSet.each(function() {
        var elem, key, value;
        elem = $(this);
        key = elem.data("localize");
        key || (key = elem.attr("rel").match(/localize\[(.*?)\]/)[1]);
        value = valueForKey(key, data);
        if (value != null) {
          return localizeElement(elem, key, value);
        }
      });
    };
    localizeElement = function(elem, key, value) {
      if (elem.is('input')) {
        localizeInputElement(elem, key, value);
      } else if (elem.is('img')) {
        localizeImageElement(elem, key, value);
      } else if (elem.is('optgroup')) {
        localizeOptgroupElement(elem, key, value);
      } else if (!$.isPlainObject(value)) {
        elem.html(value);
      }
      if ($.isPlainObject(value)) {
        return localizeForSpecialKeys(elem, value);
      }
    };
    localizeInputElement = function(elem, key, value) {
      var val;
      val = $.isPlainObject(value) ? value.value : value;
      if (elem.is("[placeholder]")) {
        return elem.attr("placeholder", val);
      } else {
        return elem.val(val);
      }
    };
    localizeForSpecialKeys = function(elem, value) {
      setAttrFromValueForKey(elem, "title", value);
      return setTextFromValueForKey(elem, "text", value);
    };
    localizeOptgroupElement = function(elem, key, value) {
      return elem.attr("label", value);
    };
    localizeImageElement = function(elem, key, value) {
      setAttrFromValueForKey(elem, "alt", value);
      return setAttrFromValueForKey(elem, "src", value);
    };
    valueForKey = function(key, data) {
      var keys, value, _i, _len;
      keys = key.split(/\./);
      value = data;
      for (_i = 0, _len = keys.length; _i < _len; _i++) {
        key = keys[_i];
        value = value != null ? value[key] : null;
      }
      return value;
    };
    setAttrFromValueForKey = function(elem, key, value) {
      value = valueForKey(key, value);
      if (value != null) {
        return elem.attr(key, value);
      }
    };
    setTextFromValueForKey = function(elem, key, value) {
      value = valueForKey(key, value);
      if (value != null) {
        return elem.text(value);
      }
    };
    regexify = function(string_or_regex_or_array) {
      var thing;
      if (typeof string_or_regex_or_array === "string") {
        return "^" + string_or_regex_or_array + "$";
      } else if (string_or_regex_or_array.length != null) {
        return ((function() {
          var _i, _len, _results;
          _results = [];
          for (_i = 0, _len = string_or_regex_or_array.length; _i < _len; _i++) {
            thing = string_or_regex_or_array[_i];
            _results.push(regexify(thing));
          }
          return _results;
        })()).join("|");
      } else {
        return string_or_regex_or_array;
      }
    };
    lang = normaliseLang(options.language ? options.language : $.defaultLanguage);
    if (!(options.skipLanguage && lang.match(regexify(options.skipLanguage)))) {
      loadLanguage(pkg, lang, 1);
    }
    return wrappedSet;
  };
  $.fn.localize = $.localize;
  return $.localize.data = {};
})(jQuery);