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// Copyright (c) 2014-2022 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAO_PEGTL_INTERNAL_IF_THEN_ELSE_HPP
#define TAO_PEGTL_INTERNAL_IF_THEN_ELSE_HPP
#include "../config.hpp"
#include "enable_control.hpp"
#include "not_at.hpp"
#include "seq.hpp"
#include "sor.hpp"
#include "../apply_mode.hpp"
#include "../rewind_mode.hpp"
#include "../type_list.hpp"
namespace TAO_PEGTL_NAMESPACE::internal
{
template< typename Cond, typename Then, typename Else >
struct if_then_else
{
using rule_t = if_then_else;
using subs_t = type_list< Cond, Then, Else >;
template< apply_mode A,
rewind_mode M,
template< typename... >
class Action,
template< typename... >
class Control,
typename ParseInput,
typename... States >
[[nodiscard]] static bool match( ParseInput& 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 >
inline constexpr bool enable_control< if_then_else< Cond, Then, Else > > = false;
} // namespace TAO_PEGTL_NAMESPACE::internal
#endif
Version data entries
13 entries across 13 versions & 1 rubygems