// Copyright (c) 2014-2020 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/

#ifndef TAO_PEGTL_INTERNAL_STRING_HPP
#define TAO_PEGTL_INTERNAL_STRING_HPP

#include <cstring>
#include <utility>

#include "../config.hpp"

#include "bump_help.hpp"
#include "result_on_found.hpp"
#include "skip_control.hpp"
#include "trivial.hpp"

#include "../analysis/counted.hpp"

namespace tao
{
   namespace TAO_PEGTL_NAMESPACE
   {
      namespace internal
      {
         inline bool unsafe_equals( const char* s, const std::initializer_list< char >& l ) noexcept
         {
            return std::memcmp( s, &*l.begin(), l.size() ) == 0;
         }

         template< char... Cs >
         struct string;

         template<>
         struct string<>
            : trivial< true >
         {
         };

         template< char... Cs >
         struct string
         {
            using analyze_t = analysis::counted< analysis::rule_type::any, sizeof...( Cs ) >;

            template< typename Input >
            static bool match( Input& in ) noexcept( noexcept( in.size( 0 ) ) )
            {
               if( in.size( sizeof...( Cs ) ) >= sizeof...( Cs ) ) {
                  if( unsafe_equals( in.current(), { Cs... } ) ) {
                     bump_help< result_on_found::success, Input, char, Cs... >( in, sizeof...( Cs ) );
                     return true;
                  }
               }
               return false;
            }
         };

         template< char... Cs >
         struct skip_control< string< Cs... > > : std::true_type
         {
         };

      }  // namespace internal

   }  // namespace TAO_PEGTL_NAMESPACE

}  // namespace tao

#endif
