dot: add x option for dot2tex

* spot/twa/acc.cc, spot/twa/acc.hh: Add a LaTeX output for acceptance
conditions.
* spot/twaalgos/dot.cc: Implement the 'x' option and refactor the code
a bit to limit duplication.
* tests/core/dot2tex.test: New test case (requires dot2tex).
* tests/Makefile.am: Add dot2tex.test.
* tests/core/alternating.test, tests/core/readsave.test,
tests/python/automata-io.ipynb: Adjust expected output.
* NEWS, doc/org/oaut.org: Mention the new option.

tests/Makefile.am

@@ -219,6 +219,7 @@ TESTS_twa = \
   core/gragsa.test \
   core/dstar.test \
   core/readsave.test \
+  core/dot2tex.test \
   core/ltldo.test \
   core/ltldo2.test \
   core/maskacc.test \

tests/core/alternating.test

@@ -573,27 +573,27 @@ digraph G {
   subgraph cluster_0 {
   color=green
   label=""
-  4 [label="t"]
+  4 [label=<t>]
   }
   subgraph cluster_1 {
   color=green
   label=""
-  1 [label="G(a & b)"]
+  1 [label=<G(a &amp; b)>]
   }
   subgraph cluster_2 {
   color=red
   label=""
-  2 [label="F!a"]
+  2 [label=<F!a>]
   }
   subgraph cluster_3 {
   color=red
   label=""
-  3 [label="F!b"]
+  3 [label=<F!b>]
   }
   subgraph cluster_4 {
   color=green
   label=""
-  0 [label="c R (c | G(a & b) | (F!b & F!a))"]
+  0 [label=<c R (c | G(a &amp; b) | (F!b &amp; F!a))>]
   -1 [label=<>,shape=point]
   -4 [label=<>,shape=point]
   -7 [label=<>,shape=point]
@@ -669,26 +669,26 @@ digraph G {
   subgraph cluster_0 {
   color=green
   label=""
-  4 [label="t"]
+  4 [label=<t>]
   }
   subgraph cluster_1 {
   color=red
   label=""
-  2 [label="F!a"]
+  2 [label=<F!a>]
   }
   subgraph cluster_2 {
   color=red
   label=""
-  3 [label="F!b"]
+  3 [label=<F!b>]
   }
   subgraph cluster_3 {
   color=green
   label=""
-  0 [label="c R (c | G(a & b) | (F!b & F!a))"]
+  0 [label=<c R (c | G(a &amp; b) | (F!b &amp; F!a))>]
   -1 [label=<>,shape=point]
   -4 [label=<>,shape=point]
   -7 [label=<>,shape=point]
-  1 [label="G(a & b)"]
+  1 [label=<G(a &amp; b)>]
   -10 [label=<>,shape=point]
   }
   0 -> 4 [label=<c>]
@@ -852,22 +852,22 @@ digraph G {
   subgraph cluster_0 {
   color=green
   label=""
-  3 [label="t"]
+  3 [label=<t>]
   }
   subgraph cluster_1 {
   color=green
   label=""
-  1 [label="Fa"]
+  1 [label=<Fa>]
   }
   subgraph cluster_2 {
   color=green
   label=""
-  2 [label="G!a"]
+  2 [label=<G!a>]
   }
   subgraph cluster_3 {
   color=green
   label=""
-  0 [label="G((b & Fa) | (!b & G!a))"]
+  0 [label=<G((b &amp; Fa) | (!b &amp; G!a))>]
   -1 [label=<>,shape=point]
   -4 [label=<>,shape=point]
   }

tests/core/dot2tex.test

@@ -0,0 +1,40 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2017 Laboratoire de Recherche et Développement
+# de l'Epita (LRDE).
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Spot 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
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. ./defs
+set -e
+
+# This tests our support for LaTeX-embedded dot, for dot2tex.
+
+# Skip this test if we don't find all the tools we need.
+(latexmk --version) || exit 77
+(pdflatex --version) || exit 77
+(dot2tex --version) || exit 77
+(dot -V) || exit 77
+
+ltl2tgba 'a U b' --dot=scanx >out.dot
+dot2tex --autosize --nominsize out.dot >out.tex
+pdflatex out.tex
+
+ltl2tgba 'p0 U p1' --dot=tax >out2.dot
+dot2tex --autosize --nominsize out2.dot >out2.tex
+grep -F 'p_{0}' out2.tex
+grep -F 'mathsf{Inf}' out2.tex
+pdflatex out2.tex

tests/core/readsave.test

@@ -406,7 +406,7 @@ digraph G {
   edge [fontname="Lato"]
   I [label="", style=invis, width=0]
   I -> 0
-  0 [label="0"]
+  0 [label=<0>]
   0 -> 0 [label=<a &amp; b<br/>$zero$one>]
   0 -> 0 [label=<!a &amp; !b>]
   0 -> 0 [label=<!a &amp; b<br/>$one>]

tests/python/automata-io.ipynb

@@ -88,9 +88,9 @@
         "  size=\"10.2,5\" edge[arrowhead=vee, arrowsize=.7]\n",
         "  I [label=\"\", style=invis, width=0]\n",
         "  I -> 1\n",
-        "  0 [label=\"0\", peripheries=2]\n",
+        "  0 [label=<0>, peripheries=2]\n",
         "  0 -> 0 [label=<1>]\n",
-        "  1 [label=\"1\"]\n",
+        "  1 [label=<1>]\n",
         "  1 -> 0 [label=<b>]\n",
         "  1 -> 1 [label=<a &amp; !b>]\n",
         "}\n",
@@ -862,4 +862,4 @@
    "metadata": {}
   }
  ]
-}
+}