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YACC(1)                 FreeBSD General Commands Manual                YACC(1)

NAME
     yacc - an LALR(1) parser generator

SYNOPSIS
     yacc [-dlrtv] [-b file_prefix] [-o output_filename] [-p symbol_prefix]
          filename

DESCRIPTION
     The yacc utility 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.  The yacc utility normally writes the parse tables and the
     driver routine to the file y.tab.c.

     The following options are available:

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

     -d      Cause the header file y.tab.h to be written.

     -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.  Any #line directives specified by
             the user will be retained.

     -o output_filename
             Cause yacc to write the generated code to output_filename instead
             of the default file, y.tab.c.

     -p symbol_prefix
             Change the prefix prepended to yacc-generated symbols to the
             string denoted by symbol_prefix.  The default prefix is the
             string yy.

     -r      Cause 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      Change the preprocessor directives generated by yacc so that
             debugging statements will be incorporated in the compiled code.

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

ENVIRONMENT
     TMPDIR      Name of directory where temporary files are to be created.

TABLES
     The names of the tables generated by this version of yacc are yylhs,
     yylen, yydefred, yydgoto, yysindex, yyrindex, yygindex, yytable, and
     yycheck.  Two additional tables, yyname and yyrule, are created if
     YYDEBUG is defined and non-zero.

FILES
     y.code.c
     y.tab.c
     y.tab.h
     y.output
     /tmp/yacc.aXXXXXXXXXX
     /tmp/yacc.tXXXXXXXXXX
     /tmp/yacc.uXXXXXXXXXX

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.

SEE ALSO
     yyfix(1)

HISTORY
     A yacc command appeared in PWB UNIX.

STANDARDS
     The yacc utility conforms to IEEE Std 1003.2 (``POSIX.2'').

FreeBSD 11.0-PRERELEASE          May 24, 1993          FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | TABLES | FILES | DIAGNOSTICS | SEE ALSO | HISTORY | STANDARDS

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