From d749b3c46a8234e6509c1e230a7bd7cfdbf14925 Mon Sep 17 00:00:00 2001
From: Stefan Pranger <stefan.pranger@student.tugraz.at>
Date: Mon, 26 Jul 2021 10:08:08 +0200
Subject: [PATCH] allow optional 'Shield' string when parsing

ShieldExpressions
---
 src/storm-parsers/parser/FormulaParserGrammar.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/storm-parsers/parser/FormulaParserGrammar.cpp b/src/storm-parsers/parser/FormulaParserGrammar.cpp
index 33bbee49b..1925d287f 100644
--- a/src/storm-parsers/parser/FormulaParserGrammar.cpp
+++ b/src/storm-parsers/parser/FormulaParserGrammar.cpp
@@ -146,7 +146,7 @@ namespace storm {
 
             shieldingType = (qi::lit("PreSafety")[qi::_val = storm::logic::ShieldingType::PreSafety]   |
                              qi::lit("PostSafety")[qi::_val = storm::logic::ShieldingType::PostSafety] |
-                             qi::lit("Optimal")[qi::_val = storm::logic::ShieldingType::Optimal]);
+                             qi::lit("Optimal")[qi::_val = storm::logic::ShieldingType::Optimal]) > -qi::lit("Shield");
             shieldingType.name("shielding type");
 
             multiplicativeFactor = qi::double_[qi::_pass = (qi::_1 >= 0) & (qi::_1 <= 1.0), qi::_val = qi::_1 ];