Description:

Bison is a general purpose parser generator which converts a grammar
description for an LALR(1) context-free grammar into a C program to
parse that grammar. Bison can be used to develop a wide range of
language parsers, from ones used in simple desk calculators to complex
programming languages. Bison is upwardly compatible with Yacc, so any
correctly written Yacc grammar should work with Bison without any changes.
If you know Yacc, you shouldn't have any trouble using Bison. You do need
to be very proficient in C programming to be able to program with Bison.
Many programs use Bison as part of their build process. Bison is only
needed on systems that are used for development.