.\" $NetBSD: yacc.1,v 1.10 1997/10/20 03:41:17 lukem Exp $ .\" .\" Copyright (c) 1989, 1990 The Regents of the University of California. .\" All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" Robert Paul Corbett. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" from: @(#)yacc.1 5.7 (Berkeley) 7/30/91 .\" $NetBSD: yacc.1,v 1.10 1997/10/20 03:41:17 lukem Exp $ .\" .Dd July 30, 1991 .Dt YACC 1 .Os .Sh NAME .Nm yacc .Nd an .Tn LALR(1) parser generator .Sh SYNOPSIS .Nm .Op Fl dlrtv .Op Fl b Ar prefix .Op Fl o Ar outputfile .Op Fl p Ar symbol_prefix .Ar filename .Sh DESCRIPTION .Nm reads the grammar specification in the file .Ar filename and generates an .Tn LR(1) parser for it. The parsers consist of a set of .Tn LALR(1) parsing tables and a driver routine written in the C programming language. .Nm 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 Ar .It Fl b Ar prefix The .Fl b option changes the prefix prepended to the output file names to the string denoted by .Ar prefix . The default prefix is the character .Ar y . .It Fl d The .Fl d option causes 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. #line directives specified by the user will be retained. .It Fl o Ar outputfile The .Fl o option specifies an explicit output file name should be used instead of the default. .It Fl p Ar symbol_prefix The .Fl p option changes the prefix prepended to yacc-generated symbols to the string denoted by .Ar symbol_prefix . The default prefix is the string .Ar yy . .It Fl r The .Fl r option causes .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 The .Fl t option changes the preprocessor directives generated by .Nm so that debugging statements will be incorporated in the compiled code. .It Fl v The .Fl v option causes a human-readable description of the generated parser to be written to the file .Pa y.output . .Pp .Sh ENVIRONMENT The following environment variable is referenced by .Nm "" : .Bl -tag -width TMPDIR .It Ev TMPDIR 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. .El .Sh TABLES The names of the tables generated by this version of .Nm are .Dq yylhs , .Dq yylen , .Dq yydefred , .Dq yydgoto , .Dq yysindex , .Dq yyrindex , .Dq yygindex , .Dq yytable , and .Dq yycheck . Two additional tables, .Dq yyname and .Dq yyrule , are created if .Dv YYDEBUG is defined and non-zero. .Sh FILES .Bl -tag -width /tmp/yacc.uXXXXXXXX -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 written to the standard error. If there are any .Tn LALR(1) conflicts, the number of conflicts is also written to the standard error. .\" .Sh SEE ALSO .\" .Xr yyfix 1 .Sh STANDARDS The .Nm utility conforms to .St -p1003.2 .