javacc/javacc

Health v2 · maintenance only

Adoption not part of the score

1278 stars · 252 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

JavaCC is a parser generator that reads grammar specifications and generates recursive-descent parsers in Java, C++, or C#. It includes supporting tools like JJTree for tree building and requires no runtime dependency once parsers are generated.

Use cases

• generate a parser for a custom DSL in Java
• build a compiler frontend from a grammar file
• parse a custom configuration or query language
• generate a lexer and parser for a programming language
• create an AST builder for a structured text format
• port a grammar to C++ or C# parser code

When to choose

• you need a pure-Java parser with no runtime dependency
• you want top-down recursive-descent parsing with LL(k) lookahead
• you need to generate parsers in Java, C++, or C# from one grammar
• you want mature, well-documented tooling with tree building included

When to avoid

• you need bottom-up LALR parsing like YACC/Bison provides
• your grammar relies heavily on left recursion
• you need parsers in languages other than Java, C++, or C#
• you want a parser combinator library embedded in host code rather than generated code

Facets

cli-tool · maturity stable

parser compiler developer-tools parsers programming-languages developer-tools compilers jvm cross-platform cli parser-generator javacc recursive-descent ll-k grammar jjtree code-generation

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