使用JFLEX从eof访问命令行参数

Question

Im writing a small lexical analyzer which needs to write some outputs to a file. Once Im done scanning im creating an output file PrintWriter writer = new PrintWriter(args[0].substring(0,4)+"output.txt");

So essentially im trying to use the prefix of my input file as the prefix of my output. This statement is located in %eof{ %eof}

error: cannot find symbol 
PrintWriter writer = new PrintWriter(args[0].substring(0,4)+"output.txt");
                                     ^ 
symbol: variable args 
location: class classname

However I cannot see args from the eof section. How could I access the command line arguments from eof in jflex?

Answer 1

The issues was with the %standalone option. It was generating a main method automatically putting the argv list out of scope.

Removing this option and defining my own main method did the trick, though I did also have to define my own file reader and error handling this way