%expext was not functioning at all.

* src/conflicts.c (expected_conflicts): Set to -1.
(conflict_report): Use ngettext.
(conflicts_print): Check %expect and make its violation an error.
* doc/bison.texinfo (Expect Decl): Adjust.
* configure.in (AM_GNU_GETTEXT): Ask for ngettext.
* tests/regression.at (%expect not enough, %expect right)
(%expect too much): New.

ChangeLog

@@ -1,3 +1,15 @@
+2001-11-12  Akim Demaille  <akim@epita.fr>
+
+	%expext was not functioning at all.
+
+	* src/conflicts.c (expected_conflicts): Set to -1.
+	(conflict_report): Use ngettext.
+	(conflicts_print): Check %expect and make its violation an error.
+	* doc/bison.texinfo (Expect Decl): Adjust.
+	* configure.in (AM_GNU_GETTEXT): Ask for ngettext.
+	* tests/regression.at (%expect not enough, %expect right)
+	(%expect too much): New.
+
 2001-11-12  Akim Demaille  <akim@epita.fr>
 
 	* tests/regression.at (Conflicts): Rename as...

configure.in

@@ -95,7 +95,7 @@ jm_PREREQ_ERROR
 AM_WITH_DMALLOC
 
 ALL_LINGUAS="de es et fr ja nl tr ru"
-AM_GNU_GETTEXT
+AM_GNU_GETTEXT(, need-ngettext)
 
 # This is necessary so that .o files in LIBOBJS are also built via
 # the ANSI2KNR-filtering rules.

doc/bison.texinfo

@@ -3071,11 +3071,11 @@ terminal symbol.  All kinds of token declarations allow
 @findex %expect
 
 Bison normally warns if there are any conflicts in the grammar
-(@pxref{Shift/Reduce, ,Shift/Reduce Conflicts}), but most real grammars have harmless shift/reduce
-conflicts which are resolved in a predictable way and would be difficult to
-eliminate.  It is desirable to suppress the warning about these conflicts
-unless the number of conflicts changes.  You can do this with the
-@code{%expect} declaration.
+(@pxref{Shift/Reduce, ,Shift/Reduce Conflicts}), but most real grammars
+have harmless shift/reduce conflicts which are resolved in a predictable
+way and would be difficult to eliminate.  It is desirable to suppress
+the warning about these conflicts unless the number of conflicts
+changes.  You can do this with the @code{%expect} declaration.
 
 The declaration looks like this:
 
@@ -3083,10 +3083,11 @@ The declaration looks like this:
 %expect @var{n}
 @end example
 
-Here @var{n} is a decimal integer.  The declaration says there should be no
-warning if there are @var{n} shift/reduce conflicts and no reduce/reduce
-conflicts.  The usual warning is given if there are either more or fewer
-conflicts, or if there are any reduce/reduce conflicts.
+Here @var{n} is a decimal integer.  The declaration says there should be
+no warning if there are @var{n} shift/reduce conflicts and no
+reduce/reduce conflicts.  An error, instead of the usual warning, is
+given if there are either more or fewer conflicts, or if there are any
+reduce/reduce conflicts.
 
 In general, using @code{%expect} involves these steps:
 

src/conflicts.c

@@ -19,6 +19,7 @@
    02111-1307, USA.  */
 
 #include "system.h"
+#include "complain.h"
 #include "getargs.h"
 #include "files.h"
 #include "gram.h"
@@ -29,7 +30,8 @@
 #include "LR0.h"
 
 errs **err_table = NULL;
-int expected_conflicts;
+/* -1 stands for not specified. */
+int expected_conflicts = -1;
 static char *conflicts = NULL;
 
 static unsigned *shiftset = NULL;
@@ -404,31 +406,23 @@ conflict_report (int src_num, int rrc_num)
   static char res[4096];
   char *cp = res;
 
-  if (src_num == 1)
+  if (src_num >= 1)
     {
-      sprintf (cp, _(" 1 shift/reduce conflict"));
-      cp += strlen (cp);
-    }
-  else if (src_num > 1)
-    {
-      sprintf (cp, _(" %d shift/reduce conflicts"), src_num);
+      sprintf (cp, ngettext ("%d shift/reduce conflict",
+			     "%d shift/reduce conflicts", src_num), src_num);
       cp += strlen (cp);
     }
 
   if (src_num > 0 && rrc_num > 0)
     {
-      sprintf (cp, _(" and"));
+      sprintf (cp, " %s ", _("and"));
       cp += strlen (cp);
     }
 
-  if (rrc_num == 1)
+  if (rrc_num >= 1)
     {
-      sprintf (cp, _(" 1 reduce/reduce conflict"));
-      cp += strlen (cp);
-    }
-  else if (rrc_num > 1)
-    {
-      sprintf (cp, _(" %d reduce/reduce conflicts"), rrc_num);
+      sprintf (cp, ngettext ("%d reduce/reduce conflict",
+			     "%d reduce/reduce conflicts", rrc_num), rrc_num);
       cp += strlen (cp);
     }
 
@@ -451,7 +445,7 @@ conflicts_output (FILE *out)
   for (i = 0; i < nstates; i++)
     if (conflicts[i])
       {
-	fprintf (out, _("State %d contains"), i);
+	fprintf (out, _("State %d contains "), i);
 	fputs (conflict_report (count_sr_conflicts (i),
 				count_rr_conflicts (i)), out);
       }
@@ -495,9 +489,19 @@ conflicts_print (void)
       }
     else
       {
-	fprintf (stderr, _("%s contains"), infile);
+	fprintf (stderr, _("%s contains "), infile);
 	fputs (conflict_report (src_total, rrc_total), stderr);
       }
+
+  if (expected_conflicts != -1
+      && src_total != expected_conflicts)
+    {
+      complain_message_count++;
+      fprintf (stderr, ngettext ("expected %d shift/reduce conflict",
+				 "expected %d shift/reduce conflicts",
+				 expected_conflicts),
+	       expected_conflicts);
+    }
 }
 
 

src/main.c

@@ -64,15 +64,16 @@ main (int argc, char *argv[])
   if (complain_message_count)
     exit (1);
 
-  /* find useless nonterminals and productions and reduce the grammar.  In
-     file reduce.c */
+  /* Find useless nonterminals and productions and reduce the grammar.
+     In file reduce.c.  */
   reduce_grammar ();
 
-  /* record other info about the grammar.  In files derives and nullable.  */
+  /* Record other info about the grammar.  In files derives and
+     nullable.  */
   set_derives ();
   set_nullable ();
 
-  /* convert to nondeterministic finite state machine.  In file LR0.
+  /* Convert to nondeterministic finite state machine.  In file LR0.
      See state.h for more info.  */
   generate_states ();
 
@@ -103,14 +104,14 @@ main (int argc, char *argv[])
   /* Output the tables and the parser to ftable.  In file output.  */
   output ();
 
+  /* Close the input files. */
+  close_files ();
+
   /* Free the symbol table data structure.  */
   free_symtab ();
 
   lex_free ();
 
-  /* Close the input files. */
-  close_files ();
-
   reduce_free ();
   free_conflicts ();
   free_nullable ();

tests/regression.at

@@ -239,6 +239,66 @@ state 6
 AT_CLEANUP(input.c input.output)
 
 
+
+## -------------------- ##
+## %expect not enough.  ##
+## -------------------- ##
+
+AT_SETUP([%expect not enough])
+
+AT_DATA([input.y],
+[[%token NUM OP
+%expect 0
+%%
+exp: exp OP exp | NUM;
+]])
+
+AT_CHECK([bison input.y -o input.c], 1, [],
+[input.y contains 1 shift/reduce conflict.
+expected 0 shift/reduce conflicts
+])
+AT_CLEANUP(input.c)
+
+
+## --------------- ##
+## %expect right.  ##
+## --------------- ##
+
+AT_SETUP([%expect right])
+
+AT_DATA([input.y],
+[[%token NUM OP
+%expect 1
+%%
+exp: exp OP exp | NUM;
+]])
+
+AT_CHECK([bison input.y -o input.c], 0, [],
+[input.y contains 1 shift/reduce conflict.
+])
+AT_CLEANUP(input.c)
+
+
+## ------------------ ##
+## %expect too much.  ##
+## ------------------ ##
+
+AT_SETUP([%expect too much])
+
+AT_DATA([input.y],
+[[%token NUM OP
+%expect 2
+%%
+exp: exp OP exp | NUM;
+]])
+
+AT_CHECK([bison input.y -o input.c], 1, [],
+[input.y contains 1 shift/reduce conflict.
+expected 2 shift/reduce conflicts
+])
+AT_CLEANUP(input.c)
+
+
 ## ---------------------- ##
 ## Mixing %token styles.  ##
 ## ---------------------- ##