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-YACC, an acronym for "Yet Another Compiler Compiler", is the name of a program which takes the description of a [[jbocre: LALR|LALR]](1) grammar and generates C code able to parse this grammar as output, written a long time ago (1974-75) for [[jbocre: UNIX|UNIX]] systems.
-The name itself comes from the fact that such a program is often used when developing a [[jbocre: compiler|compiler]] (language translation program, usually programming language to computer bytecode/assembly), while being a compiler itself.
-Today several YACC-style programs do exist, of which bison is probably the most well-known.
-Also, it is very common to call a "YACC grammar" any grammar which is a valid input for YACC. (''As well as sort of silly...'')
-LALR grammars are difficult to debug when conflicts occur. A tool called [[jbocre: YCA|YCA]] "Yacc Conflict Analyzer" can be used to sort out why Yacc has encountered ambiguities.