nl_tokens: Factory to create a transformer based on the given info and set .
pl_tokens: function transformerFactory ( fileSet , <mask> ) { return transformer // Transformer. Adds references files to the set. function transformer ( ast , file ) { var filePath = file . path var space = file . data var links = [ ] var landmarks = { } var references var current var link var pathname /* istanbul ignore if - stdin */ if ( ! filePath ) { return } references = gatherReferences ( file , ast , info , fileSet ) current = getPathname ( filePath ) for ( link in references ) { pathname = getPathname ( link ) if ( fileSet && pathname !== current && getHash ( link ) && links . indexOf ( pathname ) === - 1 ) { links . push ( pathname ) fileSet . add ( pathname ) } } landmarks [ filePath ] = true slugs . reset ( ) visit ( ast , mark ) space [ referenceId ] = references space [ landmarkId ] = landmarks function mark ( node ) { var data = node . data || { } var props = data . hProperties || { } var id = props . name || props . id || data . id if ( ! id && node . type === 'heading' ) { id = slugs . slug ( toString ( node ) ) } if ( id ) { landmarks [ filePath + '#' + id ] = true } } } }