function _parseExtension()

in pontoon/base/static/js/lib/showdown.js [2281:2338]
45 lines of code
14 McCabe index (conditional complexity)

  function _parseExtension (ext, name) {

    name = name || null;
    // If it's a string, the extension was previously loaded
    if (showdown.helper.isString(ext)) {
      ext = showdown.helper.stdExtName(ext);
      name = ext;

      // LEGACY_SUPPORT CODE
      if (showdown.extensions[ext]) {
        console.warn('DEPRECATION WARNING: ' + ext + ' is an old extension that uses a deprecated loading method.' +
          'Please inform the developer that the extension should be updated!');
        legacyExtensionLoading(showdown.extensions[ext], ext);
        return;
        // END LEGACY SUPPORT CODE

      } else if (!showdown.helper.isUndefined(extensions[ext])) {
        ext = extensions[ext];

      } else {
        throw Error('Extension "' + ext + '" could not be loaded. It was either not found or is not a valid extension.');
      }
    }

    if (typeof ext === 'function') {
      ext = ext();
    }

    if (!showdown.helper.isArray(ext)) {
      ext = [ext];
    }

    var validExt = validate(ext, name);
    if (!validExt.valid) {
      throw Error(validExt.error);
    }

    for (var i = 0; i < ext.length; ++i) {
      switch (ext[i].type) {

        case 'lang':
          langExtensions.push(ext[i]);
          break;

        case 'output':
          outputModifiers.push(ext[i]);
          break;
      }
      if (ext[i].hasOwnProperty('listeners')) {
        for (var ln in ext[i].listeners) {
          if (ext[i].listeners.hasOwnProperty(ln)) {
            listen(ln, ext[i].listeners[ln]);
          }
        }
      }
    }

  }