The Definitive ANTLR 4 Reference, 2nd Edition

Testing the Generated Parser

Once we’ve run ANTLR on our grammar, we need to compile the generated Java source code. We can do that by simply compiling everything in our /tmp/array directory.

$ cd /tmp/array
$ javac *.java     # Compile ANTLR-generated code

If you get a ClassNotFoundException error from the compiler, that means you probably haven’t set the Java CLASSPATH correctly. On UNIX systems, you’ll need to execute the following command (and likely add to your start-up script such as .bash_profile):

$ export CLASSPATH=".:/usr/local/lib/antlr-4.0-complete.jar:$CLASSPATH"

To test our grammar, we use the TestRig via alias grun that we saw in the previous chapter. Here’s how to print out the tokens created by ...