Question

i’m having an error showing :

line 1:5 mismatched input '<EOF>' expecting NEWLINE

for my input :

print "hi"

I’m basically new to ANTLR so I really don’t have any idea on what this error is about? I do get that I should have an End-of-File, but how should I place it?

Answer 1

I’m basically new to ANTLR so I really don’t have any idea on what this error is about?

It means the parser stumbles upon the end of the file, while it expects a line break. To fix it, simply place a line break at the end of your input.

This means you have something like this in your grammar:

parse : (statement NEWLINE)+ EOF

making the NEWLINE mandatory just before the EOF. You could also do something like this:

parse : statement (NEWLINE statement)* NEWLINE* EOF

making NEWLINE optional at the end, but mandatory between statements.