* src/ltlvisit/nenoform.hh, src/ltlvisit/nenoform.cc: New files.

* src/ltlvisit/Makefile.am (libltlvisit_a_SOURCES): Add them.
* src/ltltest/equals.cc (main) [NENOFORM]: Call negative_normal_form.
* src/ltltest/nenoform.test, src/ltltest/tunenoform.test: New files.
* src/ltltest/Makefile.am (check_PROGRAMS): Add nenoform and
tunenoform.
(nenoform_SOURCES, nenoform_CPPFLAGS, tunenoform_SOURCES,
tunenoform_CPPFLAGS): New variables.
(TESTS): Add nenoform.test and tunenoform.test.

src/ltltest/tunenoform.test

@@ -0,0 +1,21 @@
+#! /bin/sh
+
+# Check for unabbreviate_ltl + negative_normal_form visitors
+
+. ./defs || exit 1
+
+check()
+{
+  ./tunenoform "$1" "$2" || exit 1
+}
+
+check '!(a ^ b)' '(a|!b) & (!a|b)'
+check '!(a <=> b)' '(a|b) & (!a|!b)'
+check '!(a => b)' 'a&!b'
+check '!(!a => !b)' '!a&b'
+check '!Fa' 'false R !a'
+check '!G!a' 'true U a'
+check '!(GF a => FG b)' '(0 R (1 U a)) & (0 R (1 U !b))'
+
+# Success.
+: