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YACC(1)                     General Commands Manual                    YACC(1)



NAME
       Yacc - an LALR(1) parser generator

SYNOPSIS
       yacc [ -dglrtv ] [ -b file_prefix ] [ -p symbol_prefix ] filename

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

       The following options are available:

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

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

              -g     The -g option causes a graphical description of the  gen-
                     erated  LALR(1) parser to be written to the file y.dot in
                     graphviz format, ready to be processed by dot(1).

              -l     If the -l option is not specified, yacc will insert #line
                     directives  in  the generated code.  The #line directives
                     let the C compiler relate errors in the generated code to
                     the user's original code.  If the -l option is specified,
                     yacc will not insert the #line directives.  #line  direc-
                     tives specified by the user will be retained.

              -o output_file
                     specify the filename for the parser file.  If this option
                     is not given, the output filename is the file prefix con-
                     catenated  with  the  file  suffix,  e.g., y.tab.c.  This
                     overrides the -p option.

              -p symbol_prefix
                     The -p option changes the prefix prepended to yacc-gener-
                     ated symbols to the string denoted by symbol_prefix.  The
                     default prefix is the string yy.

              -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  gener-
                     ated  by yacc so that debugging statements will be incor-
                     porated 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.

              -V     print the version number to the standard output.

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.



4.3 Berkeley Distribution        July 15, 1990                         YACC(1)