yacc

NAME

       Yacc - an LALR(1) parser generator

SYNOPSIS

       yacc [ -dlrtv ] [ -b prefix ] filename

DESCRIPTION

       Yacc  reads the grammar specification in the file filename
       and generates an LR(1) parser for it.  The parsers consist
       of  a  set  of LALR(1) parsing tables and a driver routine
       written in the  C  programming  language.   Yacc  normally
       writes the parse tables and the driver routine to the file
       y.tab.c.

       The following options are available:

              -b prefix
                     The -b option changes the  prefix  prepended
                     to  the  output  file  names  to  the string
                     denoted by prefix.  The  default  prefix  is
                     the character y.

              -d     The -d option causes the header file y.tab.h
                     to be written.

              -l     If the -l option is not specified, yacc will
                     insert  The  generated  code  to  the user's
                     original code.  If the -l option  is  speci-
                     fied, yacc will not insert the .TP -r The -r
                     option causes yacc to produce separate files
                     for code and tables.  The code file is named
                     y.code.c,  and  the  tables  file  is  named
                     y.tab.c.

              -t     The   -t  option  changes  the  preprocessor
                     directives generated by yacc so that  debug-
                     ging  statements will be incorporated in the
                     compiled code.

              -v     The  -v  option  causes   a   human-readable
                     description  of  the  generated parser to be
                     written to the file y.output.

       If the environment variable  TMPDIR  is  set,  the  string
       denoted  by  TMPDIR will be used as the name of the direc-
       tory where the temporary files are created.

FILES

       y.code.c
       y.tab.c
       y.tab.h
       y.output
       /tmp/yacc.aXXXXXX
       /tmp/yacc.tXXXXXX
       /tmp/yacc.uXXXXXX

DIAGNOSTICS

       If there are rules that are never reduced, the  number  of
       such  rules  is  reported on standard error.  If there are
       any LALR(1) conflicts, the number of conflicts is reported
       on standard error.