head	1.3;
access;
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locks; strict;
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desc
@@


1.3
log
@Switching exporter and resync
@
text
@.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" 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.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. 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) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	@@(#)ss1	8.1 (Berkeley) 6/8/93
.\"
.\" $FreeBSD: head/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
.tr *\(**
.tr |\(or
.SH
1: Basic Specifications
.PP
Names refer to either tokens or nonterminal symbols.
Yacc requires
token names to be declared as such.
In addition, for reasons discussed in Section 3, it is often desirable
to include the lexical analyzer as part of the specification file;
it may be useful to include other programs as well.
Thus, every specification file consists of three sections:
the
.I declarations ,
.I "(grammar) rules" ,
and
.I programs .
The sections are separated by double percent ``%%'' marks.
(The percent ``%'' is generally used in Yacc specifications as an escape character.)
.PP
In other words, a full specification file looks like
.DS
declarations
%%
rules
%%
programs
.DE
.PP
The declaration section may be empty.
Moreover, if the programs section is omitted, the second %% mark may be omitted also;
thus, the smallest legal Yacc specification is
.DS
%%
rules
.DE
.PP
Blanks, tabs, and newlines are ignored except
that they may not appear in names or multi-character reserved symbols.
Comments may appear wherever a name is legal; they are enclosed
in /* . . . */, as in C and PL/I.
.PP
The rules section is made up of one or more grammar rules.
A grammar rule has the form:
.DS
A  :  BODY  ;
.DE
A represents a nonterminal name, and BODY represents a sequence of zero or more names and literals.
The colon and the semicolon are Yacc punctuation.
.PP
Names may be of arbitrary length, and may be made up of letters, dot ``.'', underscore ``\_'', and
non-initial digits.
Upper and lower case letters are distinct.
The names used in the body of a grammar rule may represent tokens or nonterminal symbols.
.PP
A literal consists of a character enclosed in single quotes ``\'''.
As in C, the backslash ``\e'' is an escape character within literals, and all the C escapes
are recognized.
Thus
.DS
\'\en\'	newline
\'\er\'	return
\'\e\'\'	single quote ``\'''
\'\e\e\'	backslash ``\e''
\'\et\'	tab
\'\eb\'	backspace
\'\ef\'	form feed
\'\exxx\'	``xxx'' in octal
.DE
For a number of technical reasons, the
\s-2NUL\s0
character (\'\e0\' or 0) should never
be used in grammar rules.
.PP
If there are several grammar rules with the same left hand side, the vertical bar ``|''
can be used to avoid rewriting the left hand side.
In addition,
the semicolon at the end of a rule can be dropped before a vertical bar.
Thus the grammar rules
.DS
A	:	B  C  D   ;
A	:	E  F   ;
A	:	G   ;
.DE
can be given to Yacc as
.DS
A	:	B  C  D
	|	E  F
	|	G
	;
.DE
It is not necessary that all grammar rules with the same left side appear together in the grammar rules section,
although it makes the input much more readable, and easier to change.
.PP
If a nonterminal symbol matches the empty string, this can be indicated in the obvious way:
.DS
empty :   ;
.DE
.PP
Names representing tokens must be declared; this is most simply done by writing
.DS
%token   name1  name2 . . .
.DE
in the declarations section.
(See Sections 3 , 5, and 6 for much more discussion).
Every name not defined in the declarations section is assumed to represent a nonterminal symbol.
Every nonterminal symbol must appear on the left side of at least one rule.
.PP
Of all the nonterminal symbols, one, called the
.I "start symbol" ,
has particular importance.
The parser is designed to recognize the start symbol; thus,
this symbol represents the largest,
most general structure described by the grammar rules.
By default,
the start symbol is taken to be the left hand side of the first
grammar rule in the rules section.
It is possible, and in fact desirable, to declare the start
symbol explicitly in the declarations section using the %start keyword:
.DS
%start   symbol
.DE
.PP
The end of the input to the parser is signaled by a special token, called the
.I endmarker .
If the tokens up to, but not including, the endmarker form a structure
which matches the start symbol, the parser function returns to its caller
after the endmarker is seen; it
.I accepts
the input.
If the endmarker is seen in any other context, it is an error.
.PP
It is the job of the user-supplied lexical analyzer
to return the endmarker when appropriate; see section 3, below.
Usually the endmarker represents some reasonably obvious 
I/O status, such as ``end-of-file'' or ``end-of-record''.
@


1.3.2.1
log
@file ss1 was added on branch RELENG_8_4 on 2013-03-28 13:03:41 +0000
@
text
@d1 175
@


1.3.2.2
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/248810
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@a0 175
.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" 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.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. 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) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	@@(#)ss1	8.1 (Berkeley) 6/8/93
.\"
.\" $FreeBSD: releng/8.4/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
.tr *\(**
.tr |\(or
.SH
1: Basic Specifications
.PP
Names refer to either tokens or nonterminal symbols.
Yacc requires
token names to be declared as such.
In addition, for reasons discussed in Section 3, it is often desirable
to include the lexical analyzer as part of the specification file;
it may be useful to include other programs as well.
Thus, every specification file consists of three sections:
the
.I declarations ,
.I "(grammar) rules" ,
and
.I programs .
The sections are separated by double percent ``%%'' marks.
(The percent ``%'' is generally used in Yacc specifications as an escape character.)
.PP
In other words, a full specification file looks like
.DS
declarations
%%
rules
%%
programs
.DE
.PP
The declaration section may be empty.
Moreover, if the programs section is omitted, the second %% mark may be omitted also;
thus, the smallest legal Yacc specification is
.DS
%%
rules
.DE
.PP
Blanks, tabs, and newlines are ignored except
that they may not appear in names or multi-character reserved symbols.
Comments may appear wherever a name is legal; they are enclosed
in /* . . . */, as in C and PL/I.
.PP
The rules section is made up of one or more grammar rules.
A grammar rule has the form:
.DS
A  :  BODY  ;
.DE
A represents a nonterminal name, and BODY represents a sequence of zero or more names and literals.
The colon and the semicolon are Yacc punctuation.
.PP
Names may be of arbitrary length, and may be made up of letters, dot ``.'', underscore ``\_'', and
non-initial digits.
Upper and lower case letters are distinct.
The names used in the body of a grammar rule may represent tokens or nonterminal symbols.
.PP
A literal consists of a character enclosed in single quotes ``\'''.
As in C, the backslash ``\e'' is an escape character within literals, and all the C escapes
are recognized.
Thus
.DS
\'\en\'	newline
\'\er\'	return
\'\e\'\'	single quote ``\'''
\'\e\e\'	backslash ``\e''
\'\et\'	tab
\'\eb\'	backspace
\'\ef\'	form feed
\'\exxx\'	``xxx'' in octal
.DE
For a number of technical reasons, the
\s-2NUL\s0
character (\'\e0\' or 0) should never
be used in grammar rules.
.PP
If there are several grammar rules with the same left hand side, the vertical bar ``|''
can be used to avoid rewriting the left hand side.
In addition,
the semicolon at the end of a rule can be dropped before a vertical bar.
Thus the grammar rules
.DS
A	:	B  C  D   ;
A	:	E  F   ;
A	:	G   ;
.DE
can be given to Yacc as
.DS
A	:	B  C  D
	|	E  F
	|	G
	;
.DE
It is not necessary that all grammar rules with the same left side appear together in the grammar rules section,
although it makes the input much more readable, and easier to change.
.PP
If a nonterminal symbol matches the empty string, this can be indicated in the obvious way:
.DS
empty :   ;
.DE
.PP
Names representing tokens must be declared; this is most simply done by writing
.DS
%token   name1  name2 . . .
.DE
in the declarations section.
(See Sections 3 , 5, and 6 for much more discussion).
Every name not defined in the declarations section is assumed to represent a nonterminal symbol.
Every nonterminal symbol must appear on the left side of at least one rule.
.PP
Of all the nonterminal symbols, one, called the
.I "start symbol" ,
has particular importance.
The parser is designed to recognize the start symbol; thus,
this symbol represents the largest,
most general structure described by the grammar rules.
By default,
the start symbol is taken to be the left hand side of the first
grammar rule in the rules section.
It is possible, and in fact desirable, to declare the start
symbol explicitly in the declarations section using the %start keyword:
.DS
%start   symbol
.DE
.PP
The end of the input to the parser is signaled by a special token, called the
.I endmarker .
If the tokens up to, but not including, the endmarker form a structure
which matches the start symbol, the parser function returns to its caller
after the endmarker is seen; it
.I accepts
the input.
If the endmarker is seen in any other context, it is an error.
.PP
It is the job of the user-supplied lexical analyzer
to return the endmarker when appropriate; see section 3, below.
Usually the endmarker represents some reasonably obvious 
I/O status, such as ``end-of-file'' or ``end-of-record''.
@


1.2
log
@Remove original license disclaimer.
Add Caldera license.

Approved by:    David Taylor <davidt@@caldera.com>

Make roughly buildable under FreeBSD.

The results are not perfect: the original Makefile referred to a refer
file papers/Ind, which doesn't seem to have been kept, so the
references to other publications are missing.  In addition, the
pagination is not correct, with the result that some .DS/.DE blocks
leave large amounts of white space empty before them.  Possibly this
could be fixed by putting the (blank) footnotes at the end.

PR:   35345
Requested by:	Tony Finch <fanf@@dotat.at>
@
text
@d39 1
a39 1
.\" $FreeBSD$
@


1.2.24.1
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/7/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.14.1
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/6/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1
log
@SVN rev 225736 on 2011-09-23 00:51:37Z by kensmith

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by:	re (implicit)
@
text
@@


1.2.42.2
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 242902
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242902 | dteske | 2012-11-11 23:29:45 +0000 (Sun, 11 Nov 2012) | 10 lines
## SVN ##
## SVN ## Fix a regression introduced by SVN r211417 that saw the breakage of a feature
## SVN ## documented in usr.sbin/sysinstall/help/shortcuts.hlp (reproduced below):
## SVN ##
## SVN ## If /usr/sbin/sysinstall is linked to another filename, say
## SVN ## `/usr/local/bin/configPackages', then the basename will be used
## SVN ## as an implicit command name.
## SVN ##
## SVN ## Reviewed by:	adrian (co-mentor)
## SVN ## Approved by:	adrian (co-mentor)
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/9/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1.4.1
log
@SVN rev 239080 on 2012-08-05 23:54:33Z by kensmith

Copy stable/9 to releng/9.1 as part of the 9.1-RELEASE release process.

Approved by:	re (implicit)
@
text
@@


1.2.42.1.4.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/9.1/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1.2.1
log
@SVN rev 227445 on 2011-11-11 04:20:22Z by kensmith

Copy stable/9 to releng/9.0 as part of the FreeBSD 9.0-RELEASE release
cycle.

Approved by:	re (implicit)
@
text
@@


1.2.42.1.2.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/9.0/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.40.1
log
@SVN rev 216618 on 2010-12-21 17:10:29Z by kensmith

Copy stable/7 to releng/7.4 in preparation for FreeBSD-7.4 release.

Approved by:	re (implicit)
@
text
@@


1.2.40.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/7.4/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.38.1
log
@SVN rev 203736 on 2010-02-10 00:26:20Z by kensmith

Copy stable/7 to releng/7.3 as part of the 7.3-RELEASE process.

Approved by:	re (implicit)
@
text
@@


1.2.36.1
log
@SVN rev 196045 on 2009-08-03 08:13:06Z by kensmith

Copy head to stable/8 as part of 8.0 Release cycle.

Approved by:	re (Implicit)
@
text
@@


1.2.36.2
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 242909
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242909 | dim | 2012-11-12 07:47:19 +0000 (Mon, 12 Nov 2012) | 20 lines
## SVN ##
## SVN ## MFC r242625:
## SVN ##
## SVN ## Remove duplicate const specifiers in many drivers (I hope I got all of
## SVN ## them, please let me know if not).  Most of these are of the form:
## SVN ##
## SVN ## static const struct bzzt_type {
## SVN ##       [...list of members...]
## SVN ## } const bzzt_devs[] = {
## SVN ##       [...list of initializers...]
## SVN ## };
## SVN ##
## SVN ## The second const is unnecessary, as arrays cannot be modified anyway,
## SVN ## and if the elements are const, the whole thing is const automatically
## SVN ## (e.g. it is placed in .rodata).
## SVN ##
## SVN ## I have verified this does not change the binary output of a full kernel
## SVN ## build (except for build timestamps embedded in the object files).
## SVN ##
## SVN ## Reviewed by:	yongari, marius
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/8/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.36.1.8.1
log
@SVN rev 232438 on 2012-03-03 06:15:13Z by kensmith

Copy stable/8 to releng/8.3 as part of 8.3-RELEASE release cycle.

Approved by:	re (implicit)
@
text
@@


1.2.36.1.8.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/8.3/share/doc/psd/15.yacc/ss1 96913 2002-05-19 05:14:02Z grog $
@


1.2.36.1.6.1
log
@SVN rev 216617 on 2010-12-21 17:09:25Z by kensmith

Copy stable/8 to releng/8.2 in preparation for FreeBSD-8.2 release.

Approved by:	re (implicit)
@
text
@@


1.2.36.1.4.1
log
@SVN rev 209145 on 2010-06-14 02:09:06Z by kensmith

Copy stable/8 to releng/8.1 in preparation for 8.1-RC1.

Approved by:	re (implicit)
@
text
@@


1.2.36.1.2.1
log
@SVN rev 198460 on 2009-10-25 01:10:29Z by kensmith

Copy stable/8 to releng/8.0 as part of 8.0-RELEASE release procedure.

Approved by:	re (implicit)
@
text
@@


1.2.34.1
log
@SVN rev 191087 on 2009-04-15 03:14:26Z by kensmith

Create releng/7.2 from stable/7 in preparation for 7.2-RELEASE.

Approved by:	re (implicit)
@
text
@@


1.2.32.1
log
@SVN rev 185281 on 2008-11-25 02:59:29Z by kensmith

Create releng/7.1 in preparation for moving into RC phase of 7.1 release
cycle.

Approved by:	re (implicit)
@
text
@@


1.2.30.1
log
@SVN rev 183531 on 2008-10-02 02:57:24Z by kensmith

Create releng/6.4 from stable/6 in preparation for 6.4-RC1.

Approved by:	re (implicit)
@
text
@@


1.1
log
@Initial checkin: 4.4BSD version.  These files need to be updated with
current license information and adapted to the FreeBSD build
environment before they will build.

Approved by:    David Taylor <davidt@@caldera.com>
@
text
@d1 35
a35 3
.\" This module is believed to contain source code proprietary to AT&T.
.\" Use and redistribution is subject to the Berkeley Software License
.\" Agreement and your Software Agreement with AT&T (Western Electric).
@

