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YACC(1)                                                                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  language.   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 written.

              -g     The -g option causes a graphical description of the generated 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 concatenated 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-generated 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 generated by yacc so that debugging  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.

              -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)