CODEWITHSUNDEEP
parsingtreeabstract-syntax-treeantlr4
user1577269
user1577269

Reputation: 41

building an AST with antlr4 for the java language

I am trying to construct an AST using the latest version of ANTLR (v4), i found a couple of links here in stack-overflow and also on the net, that shows you how to do it for a simple grammars. However, i wanted an AST for the Java.g4 grammar (Java language). Currently , i was following the approached recommended here (https://codevomit.wordpress.com/2015/04/25/antlr4-project-with-maven-tutorial-episode-3/). However based on this approach, i needed to label all the production rules that have alternatives.

Hence, i would greatly appreciate it if someone informed me if there is a different alternative for building an AST using ANTLR4 or if there is an already labeled java.g4 grammar.

Upvotes: 0

Views: 1267

Answers (1)

GRosenberg
GRosenberg

Reputation: 6001

All of the subrule alternates do not need to be labeled. Label just those alternates where generation of a discrete context object is desired. Really just the statement, expression, and (maybe) primary rules warrant labeling.

Labeling itself is trivial.

Upvotes: 1

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