doc: improve html and pdf rendering

[bison.git] / src / print_graph.c

diff --git a/src/print_graph.c b/src/print_graph.c
index 2570ab58d445806cd5b771ae2c02fb358867ec16..76d8b3fe5f0a451c361271fe2891e0e2eb6466fa 100644 (file)
--- a/src/print_graph.c
+++ b/src/print_graph.c
@@ -1,92 +1,120 @@
-/* Output a VCG description on generated parser, for Bison,
-   Copyright 2001 Free Software Foundation, Inc.
+/* Output a graph of the generated parser, for Bison.
+
+   Copyright (C) 2001-2007, 2009-2015 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 

-   Bison is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by
    it under the terms of the GNU General Public License as published by

-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.

 
 

-   Bison is distributed in the hope that it will be useful,
+   This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License

-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 

+#include <config.h>

 #include "system.h"
 #include "system.h"

-#include "quotearg.h"
-#include "files.h"
-#include "symtab.h"
-#include "gram.h"
+

 #include "LR0.h"
 #include "LR0.h"

-#include "lalr.h"
-#include "conflicts.h"
+#include "closure.h"

 #include "complain.h"
 #include "complain.h"

+#include "conflicts.h"
+#include "files.h"

 #include "getargs.h"
 #include "getargs.h"

-#include "state.h"
-#include "reader.h"
-#include "closure.h"
-#include "obstack.h"
+#include "gram.h"
+#include "graphviz.h"
+#include "lalr.h"

 #include "print_graph.h"
 #include "print_graph.h"

-#include "vcg.h"
+#include "reader.h"
+#include "state.h"
+#include "symtab.h"

 
 

-static graph_t graph;
-static FILE *fgraph = NULL;

 
 

-static inline const char *
-escape (const char *s)
-{
-  return quotearg_n_style (1, escape_quoting_style, s);
-}
+/*----------------------------.
+| Construct the node labels.  |
+`----------------------------*/

 
 

+/* Print the lhs of a rule in such a manner that there is no vertical
+   repetition, like in *.output files. */

 
 

-/* This part will construct the label of nodes. */

 static void
 static void

-print_core (state_t *state, struct obstack *node_obstack)
+print_core (struct obstack *oout, state *s)

 {
 {

-  int i;
-  short *sitems = state->items;
-  int snitems   = state->nitems;
+  item_number const *sitems = s->items;
+  symbol *previous_lhs = NULL;
+  size_t i;
+  size_t snritems = s->nitems;

 
 

-  /* Output all the items of a state, not only its kernel.  */
-  if (trace_flag)
+  /* Output all the items of a state, not just its kernel.  */
+  if (report_flag & report_itemsets)

     {
     {

-      closure (sitems, snitems);
+      closure (sitems, snritems);

       sitems = itemset;
       sitems = itemset;

-      snitems = nitemset;
+      snritems = nitemset;

     }
 
     }
 

-  obstack_fgrow1 (node_obstack, "state %2d\n", state->number);
-  for (i = 0; i < snitems; i++)
+  obstack_printf (oout, _("State %d"), s->number);
+  obstack_sgrow (oout, "\\n\\l");
+  for (i = 0; i < snritems; i++)

     {
     {

-      short *sp;
-      short *sp1;
-      int rule;
-
-      sp1 = sp = ritem + sitems[i];
-
-      while (*sp >= 0)
-       sp++;
-
-      rule = -(*sp);
-
-      if (i)
-       obstack_1grow (node_obstack, '\n');
-      obstack_fgrow1 (node_obstack, " %s -> ",
-                     escape (rules[rule].lhs->tag));
-
-      for (sp = rules[rule].rhs; sp < sp1; sp++)
-       obstack_fgrow1 (node_obstack, "%s ", escape (symbols[*sp]->tag));
-
-      obstack_1grow (node_obstack, '.');
-
-      for (/* Nothing */; *sp >= 0; ++sp)
-       obstack_fgrow1 (node_obstack, " %s", escape (symbols[*sp]->tag));
+      item_number const *sp1 = ritem + sitems[i];
+      item_number const *sp = sp1;
+      rule *r;
+
+      while (0 <= *sp)
+        sp++;
+
+      r = &rules[item_number_as_rule_number (*sp)];
+
+      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 = r->rhs; sp < sp1; sp++)
+        obstack_printf (oout, "%s ", escape (symbols[*sp]->tag));
+
+      obstack_1grow (oout, '.');
+
+      if (0 <= *r->rhs)
+        for (/* Nothing */; *sp >= 0; ++sp)
+          obstack_printf (oout, " %s", escape (symbols[*sp]->tag));
+      else
+        obstack_printf (oout, " %%empty");
+
+      /* Experimental feature: display the lookahead tokens. */
+      if (report_flag & report_lookahead_tokens
+          && item_number_is_rule_number (*sp1))
+        {
+          /* Find the reduction we are handling.  */
+          reductions *reds = s->reductions;
+          int redno = state_reduction_find (s, r);
+
+          /* Print them if there are.  */
+          if (reds->lookahead_tokens && redno != -1)
+            {
+              bitset_iterator biter;
+              int k;
+              char const *sep = "";
+              obstack_sgrow (oout, "  [");
+              BITSET_FOR_EACH (biter, reds->lookahead_tokens[redno], k, 0)
+                {
+                  obstack_sgrow (oout, sep);
+                  obstack_sgrow (oout, escape (symbols[k]->tag));
+                  sep = ", ";
+                }
+              obstack_1grow (oout, ']');
+            }
+        }
+      obstack_sgrow (oout, "\\l");

     }
 }
 
     }
 }
 


@@ -97,43 +125,35 @@ print_core (state_t *state, struct obstack *node_obstack)
 `---------------------------------------------------------------*/
 
 static void
 `---------------------------------------------------------------*/
 
 static void

-print_actions (state_t *state, const char *node_name)
+print_actions (state const *s, FILE *fgraph)

 {
 {

+  transitions const *trans = s->transitions;

   int i;
 
   int i;
 

-  shifts   *shiftp = state->shifts;
-  reductions *redp = state->reductions;
-
-  static char buff[10];
-  edge_t edge;
-
-  if (!shiftp->nshifts && !redp)
+  if (!trans->num && !s->reductions)

     return;
 
     return;
 

-  for (i = 0; i < shiftp->nshifts; i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
+  for (i = 0; i < trans->num; i++)
+    if (!TRANSITION_IS_DISABLED (trans, i))

       {
       {

-       int state1 = shiftp->shifts[i];
-       int symbol = states[state1]->accessing_symbol;
-
-       new_edge (&edge);
-
-       if (state->number > state1)
-         edge.type = back_edge;
-       open_edge (&edge, fgraph);
-       /* The edge source is the current node.  */
-       edge.sourcename = node_name;
-       sprintf (buff, "%d", state1);
-       edge.targetname = buff;
-       /* Shifts are blue, gotos are green, and error is red. */
-       if (SHIFT_IS_ERROR (shiftp, i))
-         edge.color = red;
-       else
-         edge.color = SHIFT_IS_SHIFT(shiftp, i) ? blue : green;
-       edge.label = escape (symbols[symbol]->tag);
-       output_edge (&edge, fgraph);
-       close_edge (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);

 }
 
 
 }
 
 


@@ -143,69 +163,34 @@ print_actions (state_t *state, const char *node_name)
 `-------------------------------------------------------------*/
 
 static void
 `-------------------------------------------------------------*/
 
 static void

-print_state (state_t *state)
+print_state (state *s, FILE *fgraph)

 {
 {

-  static char name[10];

   struct obstack node_obstack;
   struct obstack node_obstack;

-  node_t node;

 
 

-  /* The labels of the nodes are their the items.  */
+  /* A node's label contains its items.  */

   obstack_init (&node_obstack);
   obstack_init (&node_obstack);

-  new_node (&node);
-  sprintf (name, "%d", state->number);
-  node.title = name;
-  print_core (state, &node_obstack);
-  obstack_1grow (&node_obstack, '\0');
-  node.label = obstack_finish (&node_obstack);
-
-  open_node (fgraph);
-  output_node (&node, fgraph);
-  close_node (fgraph);
+  print_core (&node_obstack, s);
+  output_node (s->number, obstack_finish0 (&node_obstack), fgraph);
+  obstack_free (&node_obstack, 0);

 
   /* Output the edges.  */
 
   /* Output the edges.  */

-  print_actions (state, name);
-
-  obstack_free (&node_obstack, 0);
+  print_actions (s, fgraph);

 }
 \f
 
 void
 print_graph (void)
 {
 }
 \f
 
 void
 print_graph (void)
 {

-  size_t i;
-
-  /* Output file.  */
-  fgraph = xfopen (spec_graph_file, "w");
-
-  new_graph (&graph);
-
-#if 0
-  graph.smanhattan_edges = yes;
-  graph.manhattan_edges = yes;
-#endif
-
-  graph.display_edge_labels = yes;
-  graph.layoutalgorithm = normal;
-
-  graph.port_sharing = no;
-  graph.finetuning = yes;
-  graph.straight_phase = yes;
-  graph.priority_phase = yes;
-  graph.splines = yes;
-
-  graph.crossing_weight = median;
-
-  /* Output graph options. */
-  open_graph (fgraph);
-  output_graph (&graph, fgraph);
+  state_number i;
+  FILE *fgraph = xfopen (spec_graph_file, "w");
+  start_graph (fgraph);

 
   /* Output nodes and edges. */
   new_closure (nritems);
   for (i = 0; i < nstates; i++)
 
   /* Output nodes and edges. */
   new_closure (nritems);
   for (i = 0; i < nstates; i++)

-    print_state (states[i]);
+    print_state (states[i], fgraph);

   free_closure ();
 
   free_closure ();
 

-  /* Close graph. */
-  close_graph (&graph, fgraph);
+  finish_graph (fgraph);

   xfclose (fgraph);
 }
   xfclose (fgraph);
 }