Add support for unambiguous automata

* src/twaalgos/ltl2tgba_fm.hh, src/twaalgos/ltl2tgba_fm.cc: Implement
generation of unambiguous automata.
* src/tests/ltl2tgba.cc: Add option -fu to test it.
* src/bin/common_post.cc: Adjust the group of options so we can easily
add more from ltl2tgba.cc.
* src/bin/ltl2tgba.cc: Add support for -U and --unambigous.
* src/twaalgos/translate.cc, src/twaalgos/translate.hh: Add support
for Unambiguous.
* src/tests/ltlcross.test, src/tests/ltlcross2.test: Test both
bin/ltl2tgba and tgbatest/ltl2tgba.
* NEWS: Mention the change.

src/tests/ltl2tgba.cc

@@ -146,6 +146,7 @@ syntax(char* prog)
 	    << "Options for Couvreur's FM algorithm (-f):" << std::endl
 	    << "  -fr   reduce formula at each step of FM" << std::endl
 	    << "          as specified with the -r{1..7} options" << std::endl
+	    << "  -fu   build unambiguous automata" << std::endl
             << "  -L    fair-loop approximation (implies -f)" << std::endl
             << "  -p    branching postponement (implies -f)" << std::endl
             << "  -U[PROPS]  consider atomic properties of the formula as "
@@ -330,6 +331,7 @@ checked_main(int argc, char** argv)
   bool fm_red = false;
   bool fm_exprop_opt = false;
   bool fm_symb_merge_opt = true;
+  bool fm_unambiguous = false;
   bool file_opt = false;
   bool degen_reset = true;
   bool degen_order = false;
@@ -512,6 +514,12 @@ checked_main(int argc, char** argv)
 	  fm_red = true;
 	  translation = TransFM;
 	}
+      else if (!strcmp(argv[formula_index], "-fu"))
+	{
+	  fm_unambiguous = true;
+	  fm_exprop_opt = true;
+	  translation = TransFM;
+	}
       else if (!strcmp(argv[formula_index], "-F"))
 	{
 	  file_opt = true;
@@ -1060,7 +1068,8 @@ checked_main(int argc, char** argv)
 				       post_branching,
 				       fair_loop_approx,
 				       unobservables,
-				       fm_red ? simp : 0);
+				       fm_red ? simp : 0,
+				       fm_unambiguous);
 	      break;
 	    case TransCompo:
 	      {

src/tests/ltlcross.test

@@ -41,6 +41,7 @@ EOF
 ../../bin/ltlcross --products=2 \
   "$ltl2tgba -t -f %f > %T" \
   "$ltl2tgba -t -f -y %f > %T" \
+  "$ltl2tgba -t -f -fu %f > %T" \
   "$ltl2tgba -t -f -r4 %f > %T" \
   "$ltl2tgba -t -f -R3 %f > %T" \
   "$ltl2tgba -t -f -R3 -Rm %f > %T" \

src/tests/ltlcross2.test

@@ -43,4 +43,6 @@ ltl2tgba=../../bin/ltl2tgba
 "$ltl2tgba --spin=6 --ba --medium %f > %N" \
 "$ltl2tgba --hoa  -BDC %f > %H" \
 "$ltl2tgba --lbtt -BC %f > %T" \
+"$ltl2tgba --lbtt --unambiguous --low %f > %T" \
+"$ltl2tgba --lbtt --unambiguous --high %f > %T" \
 --json=output.json --csv=output.csv