Lex
Lex is a computer program that generates lexical analyzers (“scanners” or “lexers”). It is commonly used with the yacc parser generator and is the standard lexical analyzer generator on many Unix and Unix-like systems.
Lex reads an input stream specifying the lexical analyzer and writes source code which implements the lexical analyzer in the C programming language.
Yacc (Yet Another Compiler-Compiler)
Yacc is a lookahead left-to-right rightmost derivation (LALR) parser generator, generating a LALR parser (the part of a compiler that tries to make syntactic sense of the source code) based on a formal grammar, written in a notation similar to Backus–Naur form (BNF).
Reference
- https://en.wikipedia.org/wiki/Lex_(software)
- https://en.wikipedia.org/wiki/Yacc
- https://arcb.csc.ncsu.edu/~mueller/codeopt/codeopt00/y_man.pdf
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