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YACC(1) General Commands Manual YACC(1) NAME yacc, eyacc - yet another compiler-compiler SYNOPSIS yacc [ option ... ] grammar eyacc [ -v ] [ grammar ] DESCRIPTION Yacc converts a context-free grammar and translation code into a set of tables for an LR(1) parser and translator. The grammar may be ambigu- ous; specified precedence rules are used to break ambiguities. The output file, must be compiled by the C compiler to produce a pro- gram This program must be loaded with a lexical analyzer function, yylex() (often generated by lex(1)), with a main() program, and with an error handling routine, yyerror(). Simple default versions of the last two are loaded by option -ly of ld(1). The options are -o output Direct output to the specified file instead of -D Create file containing diagnostic messages. To incorporate them in the parser, compile it with preprocessor symbol YYDEBUG de- fined. The amount of diagnostic output from the parser is regu- lated by values of an external variable 0 Report errors. 1 Also report reductions. 2 Also report the name of each token returned by -v Create file containing a description of the parsing tables and of conflicts arising from ambiguities in the grammar. -d Create file containing #define statements that associate yacc- assigned `token codes' with user-declared `token names'. In- clude it in source files other than to give access to the token codes. -s stem Change the prefix of the file names and to stem. Eyacc is a special version of yacc, with systematic error recovery. It is used to compile pascal(A). FILES temporary file temporary file parser prototype for C programs library -ly SEE ALSO lex(1) S. C. Johnson and R. Sethi, this manual, Volume 2 BUGS The parser may not have full information when it writes to so that the names of the tokens returned by may be missing. YACC(1)