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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_IF_THEN_ELSE_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_IF_THEN_ELSE_HPP
#include "../config.hpp"
#include "not_at.hpp"
#include "seq.hpp"
#include "skip_control.hpp"
#include "sor.hpp"
#include "../apply_mode.hpp"
#include "../rewind_mode.hpp"
#include "../analysis/generic.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
template< typename Cond, typename Then, typename Else >
struct if_then_else
{
using analyze_t = analysis::generic< analysis::rule_type::SOR, seq< Cond, Then >, seq< not_at< Cond >, Else > >;
template< apply_mode A,
rewind_mode M,
template< typename... > class Action,
template< typename... > class Control,
typename Input,
typename... States >
static bool match( Input& in, States&&... st )
{
auto m = in.template mark< M >();
using m_t = decltype( m );
if( Control< Cond >::template match< A, rewind_mode::REQUIRED, Action, Control >( in, st... ) ) {
return m( Control< Then >::template match< A, m_t::next_rewind_mode, Action, Control >( in, st... ) );
}
return m( Control< Else >::template match< A, m_t::next_rewind_mode, Action, Control >( in, st... ) );
}
};
template< typename Cond, typename Then, typename Else >
struct skip_control< if_then_else< Cond, Then, Else > > : std::true_type
{
};
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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