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// 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_OPT_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_OPT_HPP
#include <type_traits>
#include "../config.hpp"
#include "duseltronik.hpp"
#include "seq.hpp"
#include "skip_control.hpp"
#include "trivial.hpp"
#include "../apply_mode.hpp"
#include "../rewind_mode.hpp"
#include "../analysis/generic.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
template< typename... Rules >
struct opt;
template<>
struct opt<>
: trivial< true >
{
};
template< typename... Rules >
struct opt
{
using analyze_t = analysis::generic< analysis::rule_type::OPT, Rules... >;
template< apply_mode A,
rewind_mode,
template< typename... > class Action,
template< typename... > class Control,
typename Input,
typename... States >
static bool match( Input& in, States&&... st )
{
if( !in.empty() ) {
duseltronik< seq< Rules... >, A, rewind_mode::REQUIRED, Action, Control >::match( in, st... );
}
return true;
}
};
template< typename... Rules >
struct skip_control< opt< Rules... > > : std::true_type
{
};
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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