dot: add an option to display the acceptance

* src/tgbaalgos/dotty.cc: Display the acceptance if "a" is used.
* src/bin/common_aoutput.cc, src/bin/dstar2tgba.cc,
src/tgbaalgos/dotty.hh: Document it.
* src/tgbatest/readsave.test: Test it.

src/bin/common_aoutput.cc

@@ -50,10 +50,10 @@ static const argp_option options[] =
     /**************************************************/
     { 0, 0, 0, 0, "Output format:", 3 },
     { "dot", OPT_DOT, "c|h|n|N|s|t|v", OPTION_ARG_OPTIONAL,
-      "GraphViz's format (default).  Add letters to chose (c) circular nodes, "
-      "(h) horizontal layout, (v) vertical layout, (n) with name, "
-      "(N) without name, (s) with SCCs, "
-      "(t) always transition-based acceptance.", 0 },
+      "GraphViz's format (default).  Add letters for "
+      "(a) acceptance display, (c) circular nodes, (h) horizontal layout, "
+      "(v) vertical layout, (n) with name, (N) without name, (s) with SCCs, "
+      "(t) force transition-based acceptance.", 0 },
     { "hoaf", 'H', "s|t|m|l", OPTION_ARG_OPTIONAL,
       "Output the automaton in HOA format.  Add letters to select "
       "(s) state-based acceptance, (t) transition-based acceptance, "

src/bin/dstar2tgba.cc

@@ -72,10 +72,10 @@ static const argp_option options[] =
     /**************************************************/
     { 0, 0, 0, 0, "Output format:", 3 },
     { "dot", OPT_DOT, "c|h|n|N|s|t|v", OPTION_ARG_OPTIONAL,
-      "GraphViz's format (default).  Add letters to chose (c) circular nodes, "
-      "(h) horizontal layout, (v) vertical layout, (n) with name, "
-      "(N) without name, (s) with SCCs, "
-      "(t) always transition-based acceptance.", 0 },
+      "GraphViz's format (default).  Add letters for (a) acceptance display, "
+      "(c) circular nodes, (h) horizontal layout, (v) vertical layout, "
+      "(n) with name, (N) without name, (s) with SCCs, "
+      "(t) force transition-based acceptance.", 0 },
     { "hoaf", 'H', "s|t|m|l", OPTION_ARG_OPTIONAL,
       "Output the automaton in HOA format.  Add letters to select "
       "(s) state-based acceptance, (t) transition-based acceptance, "

src/tgbaalgos/dotty.cc

@@ -42,10 +42,12 @@ namespace spot
       bool opt_horizontal_ = true;
       bool opt_name_ = false;
       bool opt_circles_ = false;
+      bool opt_show_acc_ = false;
       bool mark_states_ = false;
       bool opt_scc_ = false;
       const_tgba_digraph_ptr aut_;
       std::vector<std::string>* sn_;
+      std::string* name_ = nullptr;
 
     public:
       dotty_output(std::ostream& os, const char* options)
@@ -55,6 +57,9 @@ namespace spot
 	  while (char c = *options++)
 	    switch (c)
 	      {
+	      case 'a':
+		opt_show_acc_ = true;
+		break;
 	      case 'c':
 		opt_circles_ = true;
 		break;
@@ -88,9 +93,19 @@ namespace spot
 	os_ << "digraph G {\n";
 	if (opt_horizontal_)
 	  os_ << "  rankdir=LR\n";
-	if (opt_name_)
-	  if (auto n = aut_->get_named_prop<std::string>("automaton-name"))
-	    escape_str(os_ << "  label=\"", *n) << "\"\n  labelloc=\"t\"\n";
+	if (name_ || opt_show_acc_)
+	  {
+	    os_ << "  label=\"";
+	    if (name_)
+	      {
+		escape_str(os_, *name_);
+		if (opt_show_acc_)
+		  os_ << "\\n";
+	      }
+	    if (opt_show_acc_)
+	      os_ << aut_->get_acceptance();
+	    os_ << "\"\n  labelloc=\"t\"\n";
+	  }
 	if (opt_circles_)
 	  os_ << "  node [shape=\"circle\"]\n";
 	os_ << "  I [label=\"\", style=invis, ";
@@ -137,6 +152,8 @@ namespace spot
       {
 	aut_ = aut;
 	sn_ = aut->get_named_prop<std::vector<std::string>>("state-names");
+	if (opt_name_)
+	  name_ = aut_->get_named_prop<std::string>("automaton-name");
 	mark_states_ = !opt_force_acc_trans_ && aut_->is_sba();
 	auto si =
 	  std::unique_ptr<scc_info>(opt_scc_ ? new scc_info(aut) : nullptr);
@@ -147,7 +164,7 @@ namespace spot
 	    for (unsigned i = 0; i < sccs; ++i)
 	      {
 		os_ << "  subgraph cluster_" << i << " {\n";
-		if (opt_name_)
+		if (name_ || opt_show_acc_)
 		  // Reset the label, otherwise the graph label would
 		  // be inherited by the cluster.
 		  os_ << "  label=\"\"\n";

src/tgbaalgos/dotty.hh

@@ -39,7 +39,8 @@ namespace spot
   /// different option.  Presently the following options are
   /// supported: 'v' for vertical output, 'h' for horizontal output,
   /// 't' force transition-based acceptance, 'N' hide the name of the
-  /// automaton, 'n' shows the name, 'c' uses circle-shaped states.
+  /// automaton, 'n' shows the name, 'c' uses circle-shaped states,
+  /// 'a' shows the acceptance.
   SPOT_API std::ostream&
   dotty_reachable(std::ostream& os,
 		  const const_tgba_ptr& g,

src/tgbatest/readsave.test

@@ -314,15 +314,12 @@ digraph G {
   I [label="", style=invis, height=0]
   I -> 3
   subgraph cluster_0 {
-  label=""
   1 [label="s1", peripheries=2]
   }
   subgraph cluster_1 {
-  label=""
   0 [label="s0", peripheries=2]
   }
   subgraph cluster_2 {
-  label=""
   3 [label="s3"]
   }
   0 -> 0 [label="b"]
@@ -337,3 +334,40 @@ EOF
 diff output expected
 
 test 1 = `$autfilt -H input --complete | $autfilt --is-complete --count`
+
+
+$ltl2tgba --dot=a 'GFa & GFb' >output
+cat output
+cat >expected <<EOF
+digraph G {
+  rankdir=LR
+  label="Inf(0)&Inf(1)"
+  labelloc="t"
+  I [label="", style=invis, width=0]
+  I -> 0
+  0 [label="0"]
+  0 -> 0 [label="a & b\n{0,1}"]
+  0 -> 0 [label="!a & !b"]
+  0 -> 0 [label="!a & b\n{1}"]
+  0 -> 0 [label="a & !b\n{0}"]
+}
+EOF
+diff output expected
+
+$ltl2tgba --dot=an 'GFa & GFb' >output
+cat output
+cat >expected <<EOF
+digraph G {
+  rankdir=LR
+  label="G(Fa & Fb)\\nInf(0)&Inf(1)"
+  labelloc="t"
+  I [label="", style=invis, width=0]
+  I -> 0
+  0 [label="0"]
+  0 -> 0 [label="a & b\n{0,1}"]
+  0 -> 0 [label="!a & !b"]
+  0 -> 0 [label="!a & b\n{1}"]
+  0 -> 0 [label="a & !b\n{0}"]
+}
+EOF
+diff output expected