question: public ParametricTextualExtensionRecognizer ( ArrayList exts ) { int size = exts . size ( ) ; for ( int i = 0 ; i < size ; i ++ ) { Object aux = exts . get ( i ) ; if ( aux instanceof String ) { String ext = ( String ) aux ; addExtension ( ext ) ; } } }
target:  It builds the recognizer with an initial extension list.