symbol tables and to emit instructions in a target language, in the case of a compiler.

Other than lexers and parsers, ANTLR can be used to generate tree parsers. These are recognizers that process abstract syntax trees, which can be automatically generated by parsers. These tree parsers are unique to ANTLR and help processing abstract syntax trees.

Licensing

and ANTLR 4 are free software, published under a three-clause BSD License. Prior versions

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