Johnson at Bell labs.Ī parser is a program that checks whether its input (viewed as a stream of tokens) meets a given grammar specification. The parser checks whether the program satisfies the syntax specification given in the input_file.y file. The source SIL program is fed as the input to the generated parser ( a.out ). This C program when compiled, yields an executable parser. Specifications (input in input_file.y) into a C implementation (y.tab.c) ofĪ corresponding push down automaton (i.e., a finite state machine with a stack). YACC translates a given Context Free Grammar (CFG) This document is a tutorial for the use of YACC to generate a parser for ExpL. YACC (Yet Another Compiler Compiler) is a tool used to generate a parser.
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