X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/8048226f50f62fb64044625bf0ebbdc403a6776e..fbca394ee1416fcfa41f839abc313a037732e84d:/src/print_graph.c?ds=sidebyside

diff --git a/src/print_graph.c b/src/print_graph.c
index 61aa1e3c..918a3df8 100644
--- a/src/print_graph.c
+++ b/src/print_graph.c
@@ -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"
@@ -40,11 +39,33 @@
 | 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_lhs (struct obstack *oout, rule *previous_rule, rule *r)
+{
+  if (previous_rule && STREQ (previous_rule->lhs->tag, r->lhs->tag))
+    {
+      int i;
+      for (i = 0; i < strlen (r->lhs->tag); ++i)
+        obstack_1grow (oout, ' ');
+      obstack_1grow (oout, '|');
+    }
+  else
+    {
+      obstack_sgrow (oout, escape (r->lhs->tag));
+      obstack_1grow (oout, ':');
+    }
+  obstack_1grow (oout, ' ');
+}
+
 static void
 print_core (struct obstack *oout, state *s)
 {
-  size_t i;
   item_number *sitems = s->items;
+  rule *previous_rule = NULL;
+  size_t i;
   size_t snritems = s->nitems;
 
   /* Output all the items of a state, not only its kernel.  */
@@ -70,12 +91,14 @@ print_core (struct obstack *oout, state *s)
 
       r = item_number_as_rule_number (*sp);
 
-      obstack_printf (oout, "%d: %s ->", r, escape (rules[r].lhs->tag));
+      obstack_printf (oout, "%3d ", r);
+      print_lhs (oout, previous_rule, &rules[r]);
+      previous_rule = &rules[r];
 
       for (sp = rules[r].rhs; sp < sp1; sp++)
-        obstack_printf (oout, " %s", escape (symbols[*sp]->tag));
+        obstack_printf (oout, "%s ", escape (symbols[*sp]->tag));
 
-      obstack_sgrow (oout, " .");
+      obstack_1grow (oout, '.');
 
       for (/* Nothing */; *sp >= 0; ++sp)
         obstack_printf (oout, " %s", escape (symbols[*sp]->tag));
@@ -129,21 +152,21 @@ 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);
       }
 }
 
@@ -161,8 +184,7 @@ 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.  */