popcorn-js/modules/parser/popcorn.parser.js

(function( Popcorn ) {

  var

  AP = Array.prototype,
  OP = Object.prototype,

  forEach = AP.forEach,
  slice = AP.slice,
  hasOwn = OP.hasOwnProperty,
  toString = OP.toString;

  // stores parsers keyed on filetype
  Popcorn.parsers = {};

  // An interface for extending Popcorn
  // with parser functionality
  Popcorn.parser = function( name, type, definition ) {

    if ( Popcorn.protect.natives.indexOf( name.toLowerCase() ) >= 0 ) {
      Popcorn.error( "'" + name + "' is a protected function name" );
      return;
    }

    // fixes parameters for overloaded function call
    if ( typeof type === "function" && !definition ) {
      definition = type;
      type = "";
    }

    if ( typeof definition !== "function" || typeof type !== "string" ) {
      return;
    }

    // Provides some sugar, but ultimately extends
    // the definition into Popcorn.p

    var natives = Popcorn.events.all,
        parseFn,
        parser = {};

    parseFn = function( filename, callback ) {

      if ( !filename ) {
        return this;
      }

      var that = this;

      Popcorn.xhr({
        url: filename,
        dataType: type,
        success: function( data ) {

          var tracksObject = definition( data ),
              tracksData,
              tracksDataLen,
              tracksDef,
              idx = 0;

          tracksData = tracksObject.data || [];
          tracksDataLen = tracksData.length;
          tracksDef = null;

          //  If no tracks to process, return immediately
          if ( !tracksDataLen ) {
            return;
          }

          //  Create tracks out of parsed object
          for ( ; idx < tracksDataLen; idx++ ) {

            tracksDef = tracksData[ idx ];

            for ( var key in tracksDef ) {

              if ( hasOwn.call( tracksDef, key ) && !!that[ key ] ) {

                that[ key ]( tracksDef[ key ] );
              }
            }
          }
          if ( callback ) {
            callback();
          }
        }
      });

      return this;
    };

    // Assign new named definition
    parser[ name ] = parseFn;

    // Extend Popcorn.p with new named definition
    Popcorn.extend( Popcorn.p, parser );

    // keys the function name by filetype extension
    //Popcorn.parsers[ name ] = true;

    return parser;
  };
})( Popcorn );