How can I build an AST using ANTLR4? [duplicate]

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ANTLR 4 produces parse trees based on the grammar instead of ASTs based on arbitrary AST operators and/or rewrite rules. This allows ANTLR 4 to automatically produce listener and visitor interfaces that you can implement in the code using your grammar.

The change can be dramatic for users upgrading existing applications from version 3, but as a whole the new system is much easier to use and (especially) maintain.

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