sp-magic.de/bower_components/foundation-sites/dist/plugins/foundation.util.mediaQuery.js

'use strict';

!function ($) {

  // Default set of media queries
  var defaultQueries = {
    'default': 'only screen',
    landscape: 'only screen and (orientation: landscape)',
    portrait: 'only screen and (orientation: portrait)',
    retina: 'only screen and (-webkit-min-device-pixel-ratio: 2),' + 'only screen and (min--moz-device-pixel-ratio: 2),' + 'only screen and (-o-min-device-pixel-ratio: 2/1),' + 'only screen and (min-device-pixel-ratio: 2),' + 'only screen and (min-resolution: 192dpi),' + 'only screen and (min-resolution: 2dppx)'
  };

  var MediaQuery = {
    queries: [],

    current: '',

    /**
     * Initializes the media query helper, by extracting the breakpoint list from the CSS and activating the breakpoint watcher.
     * @function
     * @private
     */
    _init: function () {
      var self = this;
      var extractedStyles = $('.foundation-mq').css('font-family');
      var namedQueries;

      namedQueries = parseStyleToObject(extractedStyles);

      for (var key in namedQueries) {
        if (namedQueries.hasOwnProperty(key)) {
          self.queries.push({
            name: key,
            value: 'only screen and (min-width: ' + namedQueries[key] + ')'
          });
        }
      }

      this.current = this._getCurrentSize();

      this._watcher();
    },


    /**
     * Checks if the screen is at least as wide as a breakpoint.
     * @function
     * @param {String} size - Name of the breakpoint to check.
     * @returns {Boolean} `true` if the breakpoint matches, `false` if it's smaller.
     */
    atLeast: function (size) {
      var query = this.get(size);

      if (query) {
        return window.matchMedia(query).matches;
      }

      return false;
    },


    /**
     * Gets the media query of a breakpoint.
     * @function
     * @param {String} size - Name of the breakpoint to get.
     * @returns {String|null} - The media query of the breakpoint, or `null` if the breakpoint doesn't exist.
     */
    get: function (size) {
      for (var i in this.queries) {
        if (this.queries.hasOwnProperty(i)) {
          var query = this.queries[i];
          if (size === query.name) return query.value;
        }
      }

      return null;
    },


    /**
     * Gets the current breakpoint name by testing every breakpoint and returning the last one to match (the biggest one).
     * @function
     * @private
     * @returns {String} Name of the current breakpoint.
     */
    _getCurrentSize: function () {
      var matched;

      for (var i = 0; i < this.queries.length; i++) {
        var query = this.queries[i];

        if (window.matchMedia(query.value).matches) {
          matched = query;
        }
      }

      if (typeof matched === 'object') {
        return matched.name;
      } else {
        return matched;
      }
    },


    /**
     * Activates the breakpoint watcher, which fires an event on the window whenever the breakpoint changes.
     * @function
     * @private
     */
    _watcher: function () {
      var _this = this;

      $(window).on('resize.zf.mediaquery', function () {
        var newSize = _this._getCurrentSize(),
            currentSize = _this.current;

        if (newSize !== currentSize) {
          // Change the current media query
          _this.current = newSize;

          // Broadcast the media query change on the window
          $(window).trigger('changed.zf.mediaquery', [newSize, currentSize]);
        }
      });
    }
  };

  Foundation.MediaQuery = MediaQuery;

  // matchMedia() polyfill - Test a CSS media type/query in JS.
  // Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas, David Knight. Dual MIT/BSD license
  window.matchMedia || (window.matchMedia = function () {
    'use strict';

    // For browsers that support matchMedium api such as IE 9 and webkit

    var styleMedia = window.styleMedia || window.media;

    // For those that don't support matchMedium
    if (!styleMedia) {
      var style = document.createElement('style'),
          script = document.getElementsByTagName('script')[0],
          info = null;

      style.type = 'text/css';
      style.id = 'matchmediajs-test';

      script.parentNode.insertBefore(style, script);

      // 'style.currentStyle' is used by IE <= 8 and 'window.getComputedStyle' for all other browsers
      info = 'getComputedStyle' in window && window.getComputedStyle(style, null) || style.currentStyle;

      styleMedia = {
        matchMedium: function (media) {
          var text = '@media ' + media + '{ #matchmediajs-test { width: 1px; } }';

          // 'style.styleSheet' is used by IE <= 8 and 'style.textContent' for all other browsers
          if (style.styleSheet) {
            style.styleSheet.cssText = text;
          } else {
            style.textContent = text;
          }

          // Test if media query is true or false
          return info.width === '1px';
        }
      };
    }

    return function (media) {
      return {
        matches: styleMedia.matchMedium(media || 'all'),
        media: media || 'all'
      };
    };
  }());

  // Thank you: https://github.com/sindresorhus/query-string
  function parseStyleToObject(str) {
    var styleObject = {};

    if (typeof str !== 'string') {
      return styleObject;
    }

    str = str.trim().slice(1, -1); // browsers re-quote string style values

    if (!str) {
      return styleObject;
    }

    styleObject = str.split('&').reduce(function (ret, param) {
      var parts = param.replace(/\+/g, ' ').split('=');
      var key = parts[0];
      var val = parts[1];
      key = decodeURIComponent(key);

      // missing `=` should be `null`:
      // http://w3.org/TR/2012/WD-url-20120524/#collect-url-parameters
      val = val === undefined ? null : decodeURIComponent(val);

      if (!ret.hasOwnProperty(key)) {
        ret[key] = val;
      } else if (Array.isArray(ret[key])) {
        ret[key].push(val);
      } else {
        ret[key] = [ret[key], val];
      }
      return ret;
    }, {});

    return styleObject;
  }

  Foundation.MediaQuery = MediaQuery;
}(jQuery);