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byacc(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 charac-
	     ter y.

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

     -l      If the -l option is not specified, yacc will insert #line direc-
	     tives in the generated code.  The #line directives let the C com-
	     piler 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.
     /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 num-
     ber 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 5.4			 May 24, 1993			   FreeBSD 5.4

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