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// Copyright (c) 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_APPLY_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_IF_APPLY_HPP
#include "../config.hpp"
#include "skip_control.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
template< apply_mode A, typename Rule, typename... Actions >
struct if_apply_impl;
template< typename Rule, typename... Actions >
struct if_apply_impl< apply_mode::ACTION, Rule, Actions... >
{
template< rewind_mode,
template< typename... > class Action,
template< typename... > class Control,
typename Input,
typename... States >
static bool match( Input& in, States&&... st )
{
using action_t = typename Input::action_t;
auto m = in.template mark< rewind_mode::REQUIRED >();
if( Control< Rule >::template match< apply_mode::ACTION, rewind_mode::ACTIVE, Action, Control >( in, st... ) ) {
const action_t i2( m.iterator(), in );
#ifdef __cpp_fold_expressions
( Actions::apply( i2, st... ), ... );
#else
using swallow = bool[];
(void)swallow{ ( Actions::apply( i2, st... ), true )..., true };
#endif
return m( true );
}
return false;
}
};
template< typename Rule, typename... Actions >
struct if_apply_impl< apply_mode::NOTHING, Rule, Actions... >
{
template< rewind_mode M,
template< typename... > class Action,
template< typename... > class Control,
typename Input,
typename... States >
static bool match( Input& in, States&&... st )
{
return Control< Rule >::template match< apply_mode::NOTHING, M, Action, Control >( in, st... );
}
};
template< typename Rule, typename... Actions >
struct if_apply
{
using analyze_t = typename Rule::analyze_t;
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 )
{
return if_apply_impl< A, Rule, Actions... >::template match< M, Action, Control >( in, st... );
}
};
template< typename Rule, typename... Actions >
struct skip_control< if_apply< Rule, Actions... > > : std::true_type
{
};
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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