How to use grun with Python grammar

[juli1]

Hello,

I am currently working with the python grammar and I would like to use grun on it. However, when running grun on it, I get an exception (see below).

Is there any guidance on how to use grun on the Python grammar?

$ grun PythonParser -gui
Exception in thread "main" java.lang.ClassCastException: class PythonParser
	at java.base/java.lang.Class.asSubclass(Class.java:3640)
	at org.antlr.v4.gui.TestRig.process(TestRig.java:135)
	at org.antlr.v4.gui.TestRig.main(TestRig.java:119)

[kaby76]

git clone https://github.com/antlr/grammars-v4
cd grammars-v4/python/python
mkdir x
cp *.g4 x
cp Java/* x
cd x
java -jar ~/.m2/antlr4-4.10.1-complete.jar *.g4
javac -cp ~/.m2/antlr4-4.10.1-complete.jar:. *.java
java -cp ~/.m2/antlr4-4.10.1-complete.jar:. org.antlr.v4.gui.TestRig Python root ../examples/argument.py -gui

You may have to play around with the classpath command-line option depending on Linux or Windows.

[juli1]

Thank you! It was Python and not PythonParser! Thank you so much!