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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_MUST_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_MUST_HPP
#include "../config.hpp"
#include "raise.hpp"
#include "rule_conjunction.hpp"
#include "skip_control.hpp"
#include "../apply_mode.hpp"
#include "../rewind_mode.hpp"
#include "../analysis/generic.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
// The general case applies must<> to each of the
// rules in the 'Rules' parameter pack individually.
template< typename... Rules >
struct must
{
using analyze_t = analysis::generic< analysis::rule_type::SEQ, Rules... >;
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 rule_conjunction< must< Rules >... >::template match< A, M, Action, Control >( in, st... );
}
};
// While in theory the implementation for a single rule could
// be simplified to must< Rule > = sor< Rule, raise< Rule > >, this
// would result in some unnecessary run-time overhead.
template< typename Rule >
struct must< Rule >
{
using analyze_t = typename Rule::analyze_t;
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( !Control< Rule >::template match< A, rewind_mode::DONTCARE, Action, Control >( in, st... ) ) {
raise< Rule >::template match< A, rewind_mode::DONTCARE, Action, Control >( in, st... );
}
return true;
}
};
template< typename... Rules >
struct skip_control< must< Rules... > > : std::true_type
{
};
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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