freebsd-skq/usr.bin/yacc/yacc.1

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.\" This code is derived from software contributed to Berkeley by
.\" Robert Paul Corbett.
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.\"     @(#)yacc.1	5.8 (Berkeley) 5/24/93
.\"     $Id: yacc.1,v 1.7 1997/05/14 02:33:08 steve Exp $
.\"
.Dd May 24, 1993
.Dt YACC 1
.Os
.Sh NAME
.Nm yacc
.Nd an LALR(1) parser generator
.Sh SYNOPSIS
.Nm
.Op Fl dlrtv
.Op Fl b Ar file_prefix
.Op Fl o Ar output_filename
.Op Fl p Ar symbol_prefix
.Ar filename
.Sh DESCRIPTION
.Nm Yacc
reads the grammar specification in the file
.Ar 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.
.Nm Yacc
normally writes the parse tables and the driver routine to the file
.Pa y.tab.c .
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl b Ar file_prefix
Change the prefix prepended to the output file names to
the string denoted by
.Ar file_prefix .
The default prefix is the character
.Pa y .
.It Fl d
Cause the header file
.Pa y.tab.h
to be written.
.It Fl l
If the
.Fl l
option is not specified,
.Nm
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
.Fl l
option is specified,
.Nm
will not insert the #line directives.
Any #line directives specified by the user will be retained.
.It Fl o Ar output_filename
Cause
.Nm
to write the generated code to
.Ar output_filename
instead of the default file,
.Pa y.tab.c .
.It Fl p Ar symbol_prefix
Change the prefix prepended to yacc-generated symbols to
the string denoted by
.Ar symbol_prefix .
The default prefix is the string
.Pa yy .
.It Fl r
Cause
.Nm
to produce separate files for code and tables.  The code file
is named
.Pa y.code.c ,
and the tables file is named
.Pa y.tab.c .
.It Fl t
Change the preprocessor directives generated by
.Nm
so that debugging statements will be incorporated in the compiled code.
.It Fl v
Cause a human-readable description of the generated parser to
be written to the file
.Pa y.output .
.El
.Pp
If the environment variable
.Ev TMPDIR
is set, the string denoted by
.Ev TMPDIR
will be used as the name of the directory where the temporary
files are created.
.Sh FILES
.Bl -tag -width /tmp/yacc.aXXXXXX -compact
.It Pa y.code.c
.It Pa y.tab.c
.It Pa y.tab.h
.It Pa y.output
.It Pa /tmp/yacc.aXXXXXX
.It Pa /tmp/yacc.tXXXXXX
.It Pa /tmp/yacc.uXXXXXX
.El
.Sh 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.