parser: use %empty

[bison.git] / src / print_graph.c

diff --git a/src/print_graph.c b/src/print_graph.c
index 2e3fd46035eee6349a0ccd4c896538dae3ef179c..7e429dbd107999e9ce5ff38c73cfdad635f07548 100644 (file)
--- a/src/print_graph.c
+++ b/src/print_graph.c
@@ -1,6 +1,6 @@
 /* Output a graph of the generated parser, for Bison.
 
-   Copyright (C) 2001-2007, 2009-2012 Free Software Foundation, Inc.
+   Copyright (C) 2001-2007, 2009-2013 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -18,7 +18,6 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
-#include <quotearg.h>
 #include "system.h"
 
 #include "LR0.h"
@@ -40,14 +39,18 @@
 | Construct the node labels.  |
 `----------------------------*/
 
+/* Print the lhs of a rule in such a manner that there is no vertical
+   repetition, like in *.output files. */
+
 static void
 print_core (struct obstack *oout, state *s)
 {
+  item_number const *sitems = s->items;
+  symbol *previous_lhs = NULL;
   size_t i;
-  item_number *sitems = s->items;
   size_t snritems = s->nitems;
 
-  /* Output all the items of a state, not only its kernel.  */
+  /* Output all the items of a state, not just its kernel.  */
   if (report_flag & report_itemsets)
     {
       closure (sitems, snritems);
@@ -55,23 +58,28 @@ print_core (struct obstack *oout, state *s)
       snritems = nitemset;
     }
 
-  obstack_printf (oout, "state %d\\n", s->number);
+  obstack_printf (oout, _("State %d"), s->number);
+  obstack_sgrow (oout, "\\n\\l");
   for (i = 0; i < snritems; i++)
     {
-      item_number *sp;
-      item_number *sp1;
-      rule_number r;
-
-      sp1 = sp = ritem + sitems[i];
+      item_number const *sp1 = ritem + sitems[i];
+      item_number const *sp = sp1;
+      rule *r;
 
-      while (*sp >= 0)
+      while (0 <= *sp)
         sp++;
 
-      r = item_number_as_rule_number (*sp);
+      r = &rules[item_number_as_rule_number (*sp)];
 
-      obstack_printf (oout, "%d: %s -> ", r, escape (rules[r].lhs->tag));
+      obstack_printf (oout, "%3d ", r->number);
+      if (previous_lhs && UNIQSTR_EQ (previous_lhs->tag, r->lhs->tag))
+        obstack_printf (oout, "%*s| ",
+                        (int) strlen (previous_lhs->tag), "");
+      else
+        obstack_printf (oout, "%s: ", escape (r->lhs->tag));
+      previous_lhs = r->lhs;
 
-      for (sp = rules[r].rhs; sp < sp1; sp++)
+      for (sp = r->rhs; sp < sp1; sp++)
         obstack_printf (oout, "%s ", escape (symbols[*sp]->tag));
 
       obstack_1grow (oout, '.');
@@ -85,7 +93,7 @@ print_core (struct obstack *oout, state *s)
         {
           /* Find the reduction we are handling.  */
           reductions *reds = s->reductions;
-          int redno = state_reduction_find (s, &rules[r]);
+          int redno = state_reduction_find (s, r);
 
           /* Print them if there are.  */
           if (reds->lookahead_tokens && redno != -1)
@@ -93,7 +101,7 @@ print_core (struct obstack *oout, state *s)
               bitset_iterator biter;
               int k;
               char const *sep = "";
-              obstack_1grow (oout, '[');
+              obstack_sgrow (oout, "  [");
               BITSET_FOR_EACH (biter, reds->lookahead_tokens[redno], k, 0)
                 {
                   obstack_sgrow (oout, sep);
@@ -116,9 +124,8 @@ print_core (struct obstack *oout, state *s)
 static void
 print_actions (state const *s, FILE *fgraph)
 {
-  int i;
-
   transitions const *trans = s->transitions;
+  int i;
 
   if (!trans->num && !s->reductions)
     return;
@@ -126,22 +133,24 @@ print_actions (state const *s, FILE *fgraph)
   for (i = 0; i < trans->num; i++)
     if (!TRANSITION_IS_DISABLED (trans, i))
       {
-       state *s1 = trans->states[i];
-       symbol_number sym = s1->accessing_symbol;
-
-       /* Shifts are solid, gotos are dashed, and error is dotted.  */
-       char const *style =
-         (TRANSITION_IS_ERROR (trans, i) ? "dotted"
-          : TRANSITION_IS_SHIFT (trans, i) ? "solid"
-          : "dashed");
-
-       if (TRANSITION_IS_ERROR (trans, i)
-           && strcmp (symbols[sym]->tag, "error") != 0)
-         abort ();
-       output_edge (s->number, s1->number,
-                    TRANSITION_IS_ERROR (trans, i) ? NULL : symbols[sym]->tag,
-                    style, fgraph);
+        state *s1 = trans->states[i];
+        symbol_number sym = s1->accessing_symbol;
+
+        /* Shifts are solid, gotos are dashed, and error is dotted.  */
+        char const *style =
+          (TRANSITION_IS_ERROR (trans, i) ? "dotted"
+           : TRANSITION_IS_SHIFT (trans, i) ? "solid"
+           : "dashed");
+
+        if (TRANSITION_IS_ERROR (trans, i)
+            && STRNEQ (symbols[sym]->tag, "error"))
+          abort ();
+        output_edge (s->number, s1->number,
+                     TRANSITION_IS_ERROR (trans, i) ? NULL : symbols[sym]->tag,
+                     style, fgraph);
       }
+  /* Display reductions. */
+  output_red (s, s->reductions, fgraph);
 }
 
 
@@ -158,8 +167,7 @@ print_state (state *s, FILE *fgraph)
   /* A node's label contains its items.  */
   obstack_init (&node_obstack);
   print_core (&node_obstack, s);
-  obstack_1grow (&node_obstack, '\0');
-  output_node (s->number, obstack_finish (&node_obstack), fgraph);
+  output_node (s->number, obstack_finish0 (&node_obstack), fgraph);
   obstack_free (&node_obstack, 0);
 
   /* Output the edges.  */