Make project compatible with PEGTL 3.1.0

Author: wravery

CMakeLists.txt

@@ -66,7 +66,7 @@ endfunction()
 
 find_package(Threads MODULE REQUIRED)
 
-find_package(pegtl 3.1.1 QUIET CONFIG)
+find_package(pegtl 3.1.0 QUIET CONFIG)
 if(NOT pegtl_FOUND)
   # If a compatible version of PEGTL is not already installed, build and install it from the submodule directory.
   set(PEGTL_BUILD_TESTS OFF CACHE BOOL "Disable PEGTL tests")

include/graphqlservice/GraphQLTree.h

@@ -13,6 +13,19 @@
 #include <tao/pegtl.hpp>
 #include <tao/pegtl/contrib/parse_tree.hpp>
 
+// Temporarily workaround the tao::demangle namespace in 3.1.0. This was fixed in PEGTL commit
+// https://github.com/taocpp/PEGTL/commit/0cc3128e07734fb72e23e2eeee70b9f1fc13ca5f, which put this
+// in the correct namespace defined by TAO_PEGTL_NAMESPACE (tao::graphqlpeg) and should be included
+// in 3.1.1 or later. Once that version of PEGTL is released, this can be removed.
+#include <tao/pegtl/version.hpp>
+
+#if (TAO_PEGTL_VERSION_MAJOR == 3) && (TAO_PEGTL_VERSION_MINOR == 1)                               \
+	&& (TAO_PEGTL_VERSION_PATCH < 1)
+namespace tao::graphqlpeg {
+using ::tao::demangle;
+}
+#endif
+
 #include <string>
 #include <string_view>
 #include <variant>