diff --git a/src/Lexer.cpp b/src/Lexer.cpp
index bea0a5099..a4a14cb74 100644
--- a/src/Lexer.cpp
+++ b/src/Lexer.cpp
@@ -1127,6 +1127,16 @@ bool Lexer::isOneOf (const std::vector <std::string>& options, bool endBoundary)
   return false;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+bool Lexer::isOneOf (const std::map <std::string, std::string>& options, bool endBoundary)
+{
+  for (auto& item : options)
+    if (isLiteral (item.first, endBoundary))
+      return true;
+
+  return false;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Static
 std::string Lexer::typeToString (Lexer::Type type)
diff --git a/src/Lexer.h b/src/Lexer.h
index 93aec21cb..476776755 100644
--- a/src/Lexer.h
+++ b/src/Lexer.h
@@ -28,6 +28,7 @@
 #define INCLUDED_LEXER
 
 #include <string>
+#include <map>
 #include <vector>
 #include <cstddef>
 
@@ -107,6 +108,7 @@ public:
   bool isWord         (std::string&, Lexer::Type&);
   bool isLiteral      (const std::string&, bool);
   bool isOneOf        (const std::vector <std::string>&, bool);
+  bool isOneOf        (const std::map <std::string, std::string>&, bool);
 
 private:
   std::string _text;