Add never claim parser.

* src/neverclaimparse/: New directory.
* src/neverclaimparse/fmterror.cc: New file.  Print a formatted parse
error on a output stream.
* src/neverclaimparse/neverclaimparse.yy: New file.  Parser declaration
for Bison.
* src/neverclaimparse/neverclaimscan.ll: New file.  Scanner declaration
for Flex.
* src/neverclaimparse/public.hh: New file.  Public header for external
use.
* src/neverclaimparse/parsedecl.hh: New file.  Header file for
Flex-Bison interaction.
* src/neverclaimparse/Makefile.am: New Makefile.
* src/tgbatest/neverclaimread.cc: New file.  Test program for the
never claim parser.
* src/tgbatest/neverclaimread.test: New file.  Test script for the
never claim parser.
* src/tgbatest/Makefile.am: Adjust.
* configure.ac : Adjust.
* README: Adjust.

src/tgbatest/neverclaimread.test

@@ -0,0 +1,70 @@
+#!/bin/sh
+# Copyright (C) 2009 Laboratoire de Recherche et Développement
+# de l'Epita (LRDE).
+# Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
+# département Systèmes Répartis Coopératifs (SRC), Université Pierre
+# et Marie Curie.
+#
+# 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 2 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 Spot; see the file COPYING.  If not, write to the Free
+# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+
+. ./defs
+
+set -e
+
+cat >input <<EOF
+never {
+T2_init:
+if
+:: (1) -> goto T2_init
+:: (p1 && p0) -> goto T1
+fi;
+T1:
+if
+:: (p1 && (! p0)) -> goto accept_all
+:: (p1) -> goto T1
+fi;
+accept_all:
+skip
+}
+EOF
+
+run 0 ../neverclaimread input > stdout
+
+cat >expected <<EOF
+digraph G {
+  0 [label="", style=invis, height=0]
+  0 -> 1
+  1 [label="T2_init"]
+  1 -> 2 [label="p0 & p1\n"]
+  1 -> 1 [label="1\n"]
+  2 [label="T1"]
+  2 -> 2 [label="p1\n"]
+  2 -> 3 [label="p1 & !p0\n"]
+  3 [label="accept_all"]
+  3 -> 3 [label="1\n"]
+}
+EOF
+
+# Sort out some possible inversions in the output.
+# (The order is not guaranteed by SPOT.)
+sed -e 's/!p0 & p1/p1 \& !p0/g' -e 's/p1 & p0/p0 \& p1/g' stdout \
+    > tmp_ && mv tmp_ stdout
+diff stdout expected
+
+rm input stdout expected