1 files changed, 93 insertions, 0 deletions

diff --git a/MoonParser/pegtl/internal/marker.hpp b/MoonParser/pegtl/internal/marker.hpp
new file mode 100644
index 0000000..76cba0e
--- /dev/null
+++ b/MoonParser/pegtl/internal/marker.hpp
@@ -0,0 +1,93 @@
+// Copyright (c) 2014-2017 Dr. Colin Hirsch and Daniel Frey
+// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
+
+#ifndef TAOCPP_PEGTL_INCLUDE_INTERNAL_MARKER_HPP
+#define TAOCPP_PEGTL_INCLUDE_INTERNAL_MARKER_HPP
+
+#include "../config.hpp"
+#include "../rewind_mode.hpp"
+
+namespace tao
+{
+   namespace TAOCPP_PEGTL_NAMESPACE
+   {
+      namespace internal
+      {
+         template< typename Iterator, rewind_mode M >
+         class marker
+         {
+         public:
+            static constexpr rewind_mode next_rewind_mode = M;
+
+            explicit marker( const Iterator& ) noexcept
+            {
+            }
+
+            marker( marker&& ) noexcept
+            {
+            }
+
+            marker( const marker& ) = delete;
+            void operator=( const marker& ) = delete;
+
+            bool operator()( const bool result ) const noexcept
+            {
+               return result;
+            }
+         };
+
+         template< typename Iterator >
+         class marker< Iterator, rewind_mode::REQUIRED >
+         {
+         public:
+            static constexpr rewind_mode next_rewind_mode = rewind_mode::ACTIVE;
+
+            explicit marker( Iterator& i ) noexcept
+               : m_saved( i ),
+                 m_input( &i )
+            {
+            }
+
+            marker( marker&& i ) noexcept
+               : m_saved( i.m_saved ),
+                 m_input( i.m_input )
+            {
+               i.m_input = nullptr;
+            }
+
+            ~marker() noexcept
+            {
+               if( m_input != nullptr ) {
+                  ( *m_input ) = m_saved;
+               }
+            }
+
+            marker( const marker& ) = delete;
+            void operator=( const marker& ) = delete;
+
+            bool operator()( const bool result ) noexcept
+            {
+               if( result ) {
+                  m_input = nullptr;
+                  return true;
+               }
+               return false;
+            }
+
+            const Iterator& iterator() const noexcept
+            {
+               return m_saved;
+            }
+
+         private:
+            const Iterator m_saved;
+            Iterator* m_input;
+         };
+
+      }  // namespace internal
+
+   }  // namespace TAOCPP_PEGTL_NAMESPACE
+
+}  // namespace tao
+
+#endif