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Add support for Bison's "%expect <int>" directive.

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I originally coded this myself, and now I realize {Net,Open}BSD had already
coded this.  I have tossed my version to reduce diffs between the projects.

Obtained from:	OpenBSD 2.5
This commit is contained in:
David E. O'Brien 1999-07-29 08:42:21 +00:00
parent 32610e173d
commit 030b221f78
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=49208
3 changed files with 65 additions and 7 deletions
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4
usr.bin/yacc/defs.h
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* @(#)defs.h 5.6 (Berkeley) 5/24/93
* $Id: defs.h,v 1.5 1997/02/22 19:57:58 peter Exp $
* $Id: defs.h,v 1.6 1997/08/28 06:33:52 charnier Exp $
*/
#include <sys/cdefs.h> /* for __P macro */
@ -104,6 +104,7 @@
#define START 7
#define UNION 8
#define IDENT 9
#define EXPECT 10
/* symbol classes */
@ -300,6 +301,7 @@ extern short *from_state;
extern short *to_state;
extern action **parser;
extern int SRexpect;
extern int SRtotal;
extern int RRtotal;
extern short *SRconflicts;

15
usr.bin/yacc/mkpar.c
View File

@ -39,13 +39,14 @@
static char const sccsid[] = "@(#)mkpar.c 5.3 (Berkeley) 1/20/91";
#endif
static const char rcsid[] =
"$Id: mkpar.c,v 1.7 1997/08/28 06:33:53 charnier Exp $";
"$Id: mkpar.c,v 1.8 1999/07/04 17:26:16 billf Exp $";
#endif /* not lint */
#include <stdlib.h>
#include "defs.h"
action **parser;
int SRexpect;
int SRtotal;
int RRtotal;
short *SRconflicts;
@ -333,10 +334,14 @@ remove_conflicts()
static void
total_conflicts()
{
if (SRtotal == 1)
warnx("1 shift/reduce conflict");
else if (SRtotal > 1)
warnx("%d shift/reduce conflicts", SRtotal);
/* Warn if s/r != expect or if any r/r */
if ((SRtotal != SRexpect) || RRtotal)
{
if (SRtotal == 1)
warnx("1 shift/reduce conflict");
else if (SRtotal > 1)
warnx("%d shift/reduce conflicts", SRtotal);
}
if (RRtotal == 1)
warnx("1 reduce/reduce conflict");

53
usr.bin/yacc/reader.c
View File

@ -33,7 +33,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: reader.c,v 1.6 1997/02/22 19:58:01 peter Exp $
*/
#ifndef lint
@ -329,6 +329,8 @@ keyword()
return (UNION);
if (strcmp(cache, "ident") == 0)
return (IDENT);
if (strcmp(cache, "expect") == 0)
return (EXPECT);
}
else
{
@ -974,6 +976,51 @@ int assoc;
}
/*
* %expect requires special handling
* as it really isn't part of the yacc
* grammar only a flag for yacc proper.
*/
static void
declare_expect(assoc)
int assoc;
{
register int c;
if (assoc != EXPECT) ++prec;
/*
* Stay away from nextc - doesn't
* detect EOL and will read to EOF.
*/
c = *++cptr;
if (c == EOF) unexpected_EOF();
for(;;)
{
if (isdigit(c))
{
SRexpect = get_number();
break;
}
/*
* Looking for number before EOL.
* Spaces, tabs, and numbers are ok,
* words, punc., etc. are syntax errors.
*/
else if (c == '\n' || isalpha(c) || !isspace(c))
{
syntax_error(lineno, line, cptr);
}
else
{
c = *++cptr;
if (c == EOF) unexpected_EOF();
}
}
}
static void
declare_types()
{
@ -1060,6 +1107,10 @@ read_declarations()
declare_tokens(k);
break;
case EXPECT:
declare_expect(k);
break;
case TYPE:
declare_types();
break;