From adbde8be4b6ee0a854177237391936faa8ca61c2 Mon Sep 17 00:00:00 2001
From: Maximilian Szengel <gnunet@maxsz.de>
Date: Thu, 26 Jul 2012 13:32:08 +0000
Subject: - Added coloring option to graph saving. - Fixed a bug causing NFAs
 not to print properly.

---
 src/regex/regex.c       |  8 ++++--
 src/regex/regex_graph.c | 74 ++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 61 insertions(+), 21 deletions(-)

(limited to 'src/regex')

diff --git a/src/regex/regex.c b/src/regex/regex.c
index 2152167dc..c8b8ad3fa 100644
--- a/src/regex/regex.c
+++ b/src/regex/regex.c
@@ -766,7 +766,8 @@ number_states (void *cls, unsigned int count, struct GNUNET_REGEX_State *s)
   struct GNUNET_REGEX_State **states = cls;
 
   s->proof_id = count;
-  states[count] = s;
+  if (NULL != states)
+    states[count] = s;
 }
 
 
@@ -1914,7 +1915,7 @@ nfa_add_question_op (struct GNUNET_REGEX_Context *ctx)
   struct GNUNET_REGEX_State *end;
 
   a = ctx->stack_tail;
-  
+
   if (NULL == a)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
@@ -2174,6 +2175,9 @@ GNUNET_REGEX_construct_nfa (const char *regex, const size_t len)
 
   nfa->regex = GNUNET_strdup (regex);
 
+  /* create depth-first numbering of the states for pretty printing */
+  GNUNET_REGEX_automaton_traverse (nfa, &number_states, NULL);
+
   return nfa;
 
 error:
diff --git a/src/regex/regex_graph.c b/src/regex/regex_graph.c
index b8eda8ec9..9dfdb15a4 100644
--- a/src/regex/regex_graph.c
+++ b/src/regex/regex_graph.c
@@ -42,6 +42,11 @@ struct GNUNET_REGEX_Graph_Context
    * the graph.
    */
   int verbose;
+
+  /**
+   * Coloring flag, if set to GNUNET_YES SCCs will be colored.
+   */
+  int coloring;
 };
 
 
@@ -169,15 +174,27 @@ GNUNET_REGEX_automaton_save_graph_step (void *cls, unsigned int count,
 
   if (s->accepting)
   {
-    GNUNET_asprintf (&s_acc,
-                     "\"%s\" [shape=doublecircle, color=\"0.%i 0.8 0.95\"];\n",
-                     name, s->scc_id);
+    if (GNUNET_YES == ctx->coloring)
+    {
+      GNUNET_asprintf (&s_acc,
+                       "\"%s\" [shape=doublecircle, color=\"0.%i 0.8 0.95\"];\n",
+                       name, s->scc_id);
+    }
+    else
+    {
+      GNUNET_asprintf (&s_acc, "\"%s\" [shape=doublecircle];\n", name,
+                       s->scc_id);
+    }
   }
-  else
+  else if (GNUNET_YES == ctx->coloring)
   {
-    GNUNET_asprintf (&s_acc, "\"%s\" [color=\"0.%i 0.8 0.95\"];\n", name,
+    GNUNET_asprintf (&s_acc, "\"%s\" [shape=circle, color=\"0.%i 0.8 0.95\"];\n", name,
                      s->scc_id);
   }
+  else
+  {
+    GNUNET_asprintf (&s_acc, "\"%s\" [shape=circle];\n", name, s->scc_id);
+  }
 
   if (NULL == s_acc)
   {
@@ -209,15 +226,31 @@ GNUNET_REGEX_automaton_save_graph_step (void *cls, unsigned int count,
 
     if (ctran->label == 0)
     {
-      GNUNET_asprintf (&s_tran,
-                       "\"%s\" -> \"%s\" [label = \"epsilon\", color=\"0.%i 0.8 0.95\"];\n",
-                       name, to_name, s->scc_id);
+      if (GNUNET_YES == ctx->coloring)
+      {
+        GNUNET_asprintf (&s_tran,
+                         "\"%s\" -> \"%s\" [label = \"ε\", color=\"0.%i 0.8 0.95\"];\n",
+                         name, to_name, s->scc_id);
+      }
+      else
+      {
+        GNUNET_asprintf (&s_tran, "\"%s\" -> \"%s\" [label = \"ε\"];\n",
+                         name, to_name, s->scc_id);
+      }
     }
     else
     {
-      GNUNET_asprintf (&s_tran,
-                       "\"%s\" -> \"%s\" [label = \"%c\", color=\"0.%i 0.8 0.95\"];\n",
-                       name, to_name, ctran->label, s->scc_id);
+      if (GNUNET_YES == ctx->coloring)
+      {
+        GNUNET_asprintf (&s_tran,
+                         "\"%s\" -> \"%s\" [label = \"%c\", color=\"0.%i 0.8 0.95\"];\n",
+                         name, to_name, ctran->label, s->scc_id);
+      }
+      else
+      {
+        GNUNET_asprintf (&s_tran, "\"%s\" -> \"%s\" [label = \"%c\"];\n", name,
+                         to_name, ctran->label, s->scc_id);
+      }
     }
 
     GNUNET_free (to_name);
@@ -239,17 +272,17 @@ GNUNET_REGEX_automaton_save_graph_step (void *cls, unsigned int count,
 
 
 /**
- * Save the given automaton as a GraphViz dot file
+ * Save the given automaton as a GraphViz dot file.
  *
- * @param a the automaton to be saved
- * @param filename where to save the file
- * @param verbose if set to GNUNET_YES the generated graph will include extra
- *                information such as the NFA states that were used to generate
- *                the DFA state etc.
+ * @param a the automaton to be saved.
+ * @param filename where to save the file.
+ * @param options options for graph generation that include coloring or verbose
+ *                mode
  */
 void
 GNUNET_REGEX_automaton_save_graph (struct GNUNET_REGEX_Automaton *a,
-                                   const char *filename, int verbose)
+                                   const char *filename,
+                                   enum GNUNET_REGEX_GraphSavingOptions options)
 {
   char *start;
   char *end;
@@ -268,7 +301,10 @@ GNUNET_REGEX_automaton_save_graph (struct GNUNET_REGEX_Automaton *a,
   }
 
   ctx.filep = fopen (filename, "w");
-  ctx.verbose = verbose;
+  ctx.verbose =
+      (0 == (options & GNUNET_REGEX_GRAPH_VERBOSE)) ? GNUNET_NO : GNUNET_YES;
+  ctx.coloring =
+      (0 == (options & GNUNET_REGEX_GRAPH_COLORING)) ? GNUNET_NO : GNUNET_YES;
 
   if (NULL == ctx.filep)
   {
-- 
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