Function createProcessor

public/js/processors/processor.js:68–154

(opts)

   *                Optional - defaults to the defaultProcessor (above).
   */
  var createProcessor = function (opts) {
    var url = opts.url,
        init = opts.init || passthrough,
        handler = opts.handler || defaultProcessor,
        processorData = pick(opts, 'id', 'target', 'extensions');

    opts.extensions = opts.extensions || [];
    if (!opts.extensions.length) {
      opts.extensions = [opts.id];
    }

    opts.extensions.forEach(function (ext) {
      processorBy.extension[ext] = opts.id;
    });

    // This actually loads in the processor – script files & init code
    var loadProcessor = function (ready) {

      var failed = false;

      // Overwritten when the script loads
      var callback = function () {
        if (window.console) {
          window.console.warn('Processor is not ready yet - trying again');
        }
        failed = true;
        return '';
      };

      // Script has loaded.
      // Run any init code, and swap the callback. If we failed, try again.
      var scriptCB = function () {
        init(function () {
          callback = handler;
          if (failed) {
            renderLivePreview();
          }
          ready();
        });
      };

      if (url) {
        // Load the processor's script
        getScript(url, scriptCB);
      } else {
        // No url, go straight on
        init(function () {
          callback = handler;
          ready();
        });
      }

      // Create a proxy function that holds the handler in scope so that, when
      // the callbacks are swapped, rendering still works.
      var cache = {
        source: '',
        result: ''
      };