doc: create a new Tuning LR section in the manual.

[bison.git] / src / reduce.c

diff --git a/src/reduce.c b/src/reduce.c
index 2d01255c375ec7647e99c850a046596afff76444..7a30e55532b2f197da93c46f36947f3ead6e75da 100644 (file)
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -1,7 +1,7 @@
 /* Grammar reduction for Bison.
 
-   Copyright (C) 1988, 1989, 2000, 2001, 2002, 2003, 2005, 2006,
-   2007 Free Software Foundation, Inc.
+   Copyright (C) 1988-1989, 2000-2003, 2005-2011 Free Software
+   Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -358,10 +358,10 @@ reduce_output (FILE *out)
     bool b = false;
     int i;
     for (i = 0; i < ntokens; i++)
-      if (!bitset_test (V, i) && !bitset_test (V1, i))
+      if (reduce_token_unused_in_grammar (i))
        {
          if (!b)
-           fprintf (out, "%s\n\n", _("Terminals which are not used"));
+           fprintf (out, "%s\n\n", _("Terminals unused in grammar"));
          b = true;
          fprintf (out, "   %s\n", symbols[i]->tag);
        }
@@ -375,64 +375,6 @@ reduce_output (FILE *out)
 }
 \f
 
-/*--------------------------------------------------------------.
-| Output the detailed results of the reductions.  For FILE.xml. |
-`---------------------------------------------------------------*/
-
-void
-reduce_xml (FILE *out, int level)
-{
-  fputc ('\n', out);
-  xml_puts (out, level, "<reductions>");
-  xml_puts (out, level + 1, "<useless-in-grammar>");
-
-  if (nuseless_nonterminals > 0)
-    {
-      int i;
-      xml_puts (out, level + 2, "<nonterminals>");
-      for (i = 0; i < nuseless_nonterminals; ++i)
-       xml_printf (out, level + 3,
-                   "<nonterminal>%s</nonterminal>",
-                   symbols[nsyms + i]->tag);
-      xml_puts (out, level + 2, "</nonterminals>");
-    }
-  else
-    xml_puts (out, level + 2, "<nonterminals/>");
-
-  if (nuseless_productions > 0)
-    grammar_rules_partial_print_xml (out, level + 1, true,
-                                     rule_useless_in_grammar_p);
-  else
-    xml_puts (out, level + 2, "<rules/>");
-
-  xml_puts (out, level + 1, "</useless-in-grammar>");
-  xml_puts (out, level + 1, "<unused>");
-
-  {
-    bool b = false;
-    int i;
-    for (i = 0; i < ntokens; i++)
-      if (!bitset_test (V, i) && !bitset_test (V1, i))
-       {
-         if (!b)
-           xml_puts (out, level + 2, "<terminals>");
-         b = true;
-         xml_printf (out, level + 3,
-                     "<terminal>%s</terminal>",
-                     xml_escape (symbols[i]->tag));
-       }
-    if (b)
-      xml_puts (out, level + 2, "</terminals>");
-    else
-      xml_puts (out, level + 2, "<terminals/>");
-  }
-
-  xml_puts (out, level + 1, "</unused>");
-  xml_puts (out, level, "</reductions>");
-  fputc ('\n', out);
-}
-\f
-
 /*-------------------------------.
 | Report the results to STDERR.  |
 `-------------------------------*/
@@ -440,26 +382,16 @@ reduce_xml (FILE *out, int level)
 static void
 reduce_print (void)
 {
-  fprintf (stderr, "%s: %s: ", grammar_file, _("warning"));
-
   if (nuseless_nonterminals > 0)
-    fprintf (stderr, ngettext ("%d nonterminal",
-                              "%d nonterminals",
-                              nuseless_nonterminals),
-            nuseless_nonterminals);
-
-  if (nuseless_nonterminals > 0 && nuseless_productions > 0)
-    fprintf (stderr, _(" and "));
-
+    warn (ngettext ("%d nonterminal useless in grammar",
+                    "%d nonterminals useless in grammar",
+                    nuseless_nonterminals),
+          nuseless_nonterminals);
   if (nuseless_productions > 0)
-    fprintf (stderr, ngettext ("%d rule",
-                              "%d rules",
-                              nuseless_productions),
-            nuseless_productions);
-
-  if (nuseless_nonterminals > 0 || nuseless_productions > 0)
-    fprintf (stderr, _(" useless in grammar"));
-  fprintf (stderr, "\n");
+    warn (ngettext ("%d rule useless in grammar",
+                    "%d rules useless in grammar",
+                    nuseless_productions),
+          nuseless_productions);
 }
 \f
 void
@@ -506,6 +438,19 @@ reduce_grammar (void)
     }
 }
 
+bool
+reduce_token_unused_in_grammar (symbol_number i)
+{
+  aver (i < ntokens);
+  return !bitset_test (V, i) && !bitset_test (V1, i);
+}
+
+bool
+reduce_nonterminal_useless_in_grammar (symbol_number i)
+{
+  aver (ntokens <= i && i < nsyms + nuseless_nonterminals);
+  return nsyms <= i;
+}
 
 /*-----------------------------------------------------------.
 | Free the global sets used to compute the reduced grammar.  |