Java Tree parser output for ANTLR

Question

I\'ve found a sample template in the ANTLR website, its the Javatreeparser.g, which the site says could produce the AST that I need, but since I\'m new to ANTLR, how do I ma

Answer 1

I really recommend you to use antlr4.

First, set your CLASSPATH (including antlr-4.5.3-complete.jar) and JAVA_HOME.

Second, generate a lexer and parser from the grammar Java.g4:

java -cp antlr-4.5.2-complete.jar Java.g4

Third, compile all Java*.java genereated:

javac Java*.java

Finally, run TestRig:

java org.antlr.v4.runtime.misc.TestRig Java compilationUnit -gui Test.java

You will see AST visually as follows: