piskel/dev/js/utils/PiskelFileUtils.js

(function () {
  var ns = $.namespace('pskl.utils');

  ns.PiskelFileUtils = {
    FAILURE : {
      EMPTY : 'No data found in piskel file',
      INVALID : 'Invalid piskel file, contact us on twitter @piskelapp',
      DESERIALIZATION : 'Piskel data deserialization failed'
    },

    /**
     * Load a piskel from a piskel file.
     * After deserialization is successful, the provided success callback will be called.
     * Success callback is expected to receive a single Piskel object argument
     * @param  {File} file the .piskel file to load
     * @param  {Function} onSuccess Called if the deserialization of the piskel is successful
     * @param  {Function} onError NOT USED YET
     */
    loadFromFile : function (file, onSuccess, onError) {
      pskl.utils.FileUtils.readFile(file, function (content) {
        var rawPiskel = pskl.utils.Base64.toText(content);
        ns.PiskelFileUtils.decodePiskelFile(
          rawPiskel,
          function (piskel) {
            // if using Node-Webkit, store the savePath on load
            // Note: the 'path' property is unique to Node-Webkit, and holds the full path
            if (pskl.utils.Environment.detectNodeWebkit()) {
              piskel.savePath = file.path;
            }
            onSuccess(piskel);
          },
          onError
        );
      });
    },

    decodePiskelFile : function (rawPiskel, onSuccess, onError) {
      var serializedPiskel;
      if (rawPiskel.length === 0) {
        onError(ns.PiskelFileUtils.FAILURE.EMPTY);
        return;
      }

      try {
        serializedPiskel = JSON.parse(rawPiskel);
      } catch (e) {
        onError(ns.PiskelFileUtils.FAILURE.INVALID);
        return;
      }

      var piskel = serializedPiskel.piskel;
      pskl.utils.serialization.Deserializer.deserialize(serializedPiskel, onSuccess, function () {
        onError(ns.PiskelFileUtils.FAILURE.DESERIALIZATION);
      });
    }
  };
})();