nl_tokens: Get the ID of a file .
pl_tokens: function ( path ) { let id ; if ( path === '/' ) { // "root" is a special alias for the fileId of the root folder return Promise . resolve ( 'root' ) ; } else if ( ( id = this . _fileIdCache . get ( path ) ) ) { // id is cached. return Promise . resolve ( id ) ; } // id is not cached (or file doesn't exist). // load parent folder listing to propagate / update id cache. return this . _getFolder ( parentPath ( path ) ) . then ( ( ) => { id = this . _fileIdCache . get ( path ) ; if ( ! id ) { if ( path . substr ( - 1 ) === '/' ) { return this . _createFolder ( path ) . then ( ( ) => { return this . _getFileId ( path ) ; } ) ; } else { return Promise . resolve ( ) ; } } return Promise . resolve ( <mask> ) ; } ) ; }