Lemon (parser generator)
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Lemon is a parser generator, maintained as part of the SQLite project, that generates a look-ahead LR parser (LALR parser) in the programming language C from an input context-free grammar. The generator is quite simple, implemented in one C source file with another file used as a template for output. Lexical analysis is performed externally.
|Developer(s)||D. Richard Hipp|
Lemon is similar to the programs Bison and Yacc, but is incompatible with both. The grammar input format is different, to help prevent common coding errors. Other distinctive features include a reentrant, thread-safe output parser, and the concept of non-terminal destructors that try to make it easier to avoid memory leaks.
SQLite uses Lemon with a hand-coded tokenizer to parse SQL strings.
Lemon, together with re2c and a re2c wrapper named Perplex, are used in BRL-CAD as platform-agnostic and easily compilable alternatives to Flex and Bison. This combination is also used with STEPcode.
OpenFOAM expression evaluation uses a combination of ragel and a version of lemon that has been minimally modified to ease C++ integration without affecting C integration. The parser grammars are augmented with m4 macros.
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