From 98c8725d0c86265f5aaba510efd6af25313fb50e Mon Sep 17 00:00:00 2001
From: Alexandre Duret-Lutz <adl@lrde.epita.fr>
Date: Mon, 17 Dec 2018 17:09:56 +0100
Subject: [PATCH] print_dot_psl: fix numbering of commutative operands

* spot/tl/dot.cc: Here.
* tests/python/formulas.ipynb: Add test case.
* NEWS: Mention the bug.
---
 NEWS                        |   6 +-
 spot/tl/dot.cc              |   3 +-
 tests/python/formulas.ipynb | 126 ++++++++++++++++++++----------------
 3 files changed, 79 insertions(+), 56 deletions(-)

diff --git a/NEWS b/NEWS
index 9e67c0ef3..70d4f5cf9 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,10 @@
 New in spot 2.7.0.dev (not yet release)
 
-  Nothing yet.
+  Bugs fixed:
+
+  - The print_dot_psl() function would incorrectly number all but the
+    first children of commutative n-ary operators: in this case no
+    numbering was expected.
 
 New in spot 2.7 (2018-12-11)
 
diff --git a/spot/tl/dot.cc b/spot/tl/dot.cc
index be6e2ac6b..8d8f68c4e 100644
--- a/spot/tl/dot.cc
+++ b/spot/tl/dot.cc
@@ -122,7 +122,8 @@ namespace spot
             else if (childnum == -1)
               os_ << " [taillabel=\"R\"]";
             os_ << ";\n";
-            ++childnum;
+            if (childnum)
+              ++childnum;
           }
 
         return src;
diff --git a/tests/python/formulas.ipynb b/tests/python/formulas.ipynb
index 69836c91a..ea100f7e9 100644
--- a/tests/python/formulas.ipynb
+++ b/tests/python/formulas.ipynb
@@ -57,10 +57,10 @@
     {
      "data": {
       "text/latex": [
-       "$\\{a \\mathbin{\\mathsf{;}} b^{\\star} \\mathbin{\\mathsf{;}} c^+\\}\\mathrel{\\Diamond\\kern-1.7pt\\raise.4pt\\hbox{$\\mathord{\\rightarrow}$}} \\mathsf{G} \\mathsf{F} b$"
+       "$\\{a \\mathbin{\\mathsf{;}} b^{\\star} \\mathbin{\\mathsf{;}} c^+\\}\\mathrel{\\Diamond\\kern-1.7pt\\raise.4pt\\hbox{$\\mathord{\\rightarrow}$}} (c \\land \\mathsf{G} \\mathsf{F} b)$"
       ],
       "text/plain": [
-       "spot.formula(\"{a;b[*];c[+]}<>-> GFb\")"
+       "spot.formula(\"{a;b[*];c[+]}<>-> (c & GFb)\")"
       ]
      },
      "execution_count": 3,
@@ -69,7 +69,7 @@
     }
    ],
    "source": [
-    "g = spot.formula('{a;b*;c[+]}<>->GFb'); g"
+    "g = spot.formula('{a;b*;c[+]}<>->(GFb & c)'); g"
    ]
   },
   {
@@ -497,128 +497,146 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "{a;b[*];c[+]}<>-> GFb\n"
+      "{a;b[*];c[+]}<>-> (c & GFb)\n"
      ]
     },
     {
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@@ -909,7 +927,7 @@
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