ANTLR, ANother Tool for Language Recognition, (formerly PCCTS) is a language tool that provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing Java, C#, Python, or C++ actions. ANTLR is popular because it is easy to understand, powerful, flexible, generates human-readable output, and comes with complete source. ANTLR provides excellent support for tree construction, tree walking, and translation.
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