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94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
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// Copyright (c) 2020-2022 Dr. Colin Hirsch and Daniel Frey
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// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
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#ifndef TAO_PEGTL_CONTRIB_CONTROL_ACTION_HPP
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#define TAO_PEGTL_CONTRIB_CONTROL_ACTION_HPP
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#include <utility>
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#include "../config.hpp"
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#include "../match.hpp"
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#include "../nothing.hpp"
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namespace TAO_PEGTL_NAMESPACE
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{
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namespace internal
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{
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template< typename, typename Rule, template< typename... > class Action, typename ParseInput, typename... States >
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inline constexpr bool action_has_unwind = false;
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template< typename Rule, template< typename... > class Action, typename ParseInput, typename... States >
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inline constexpr bool action_has_unwind< decltype( (void)Action< Rule >::unwind( std::declval< const ParseInput& >(), std::declval< States&& >()... ) ), Rule, Action, ParseInput, States... > = true;
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} // namespace internal
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struct control_action
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: maybe_nothing
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{
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template< typename Rule,
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apply_mode A,
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rewind_mode M,
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template< typename... >
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class Action,
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template< typename... >
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class Control,
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typename ParseInput,
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typename... States >
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[[nodiscard]] static bool match( ParseInput& in, States&&... st )
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{
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#if defined( __cpp_exceptions )
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if constexpr( internal::action_has_unwind< void, Rule, Action, ParseInput, States... > ) {
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try {
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return control_action::match_impl< Rule, A, M, Action, Control >( in, st... );
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}
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catch( ... ) {
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Action< Rule >::unwind( const_cast< const ParseInput& >( in ), st... );
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throw;
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}
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}
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else {
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return control_action::match_impl< Rule, A, M, Action, Control >( in, st... );
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}
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#else
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return control_action::match_impl< Rule, A, M, Action, Control >( in, st... );
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#endif
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}
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template< typename ParseInput, typename... States >
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static void start( const ParseInput& /*unused*/, States&&... /*unused*/ ) noexcept
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{}
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template< typename ParseInput, typename... States >
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static void success( const ParseInput& /*unused*/, States&&... /*unused*/ ) noexcept
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{}
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template< typename ParseInput, typename... States >
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static void failure( const ParseInput& /*unused*/, States&&... /*unused*/ ) noexcept
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{}
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private:
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template< typename Rule,
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apply_mode A,
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rewind_mode M,
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template< typename... >
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class Action,
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template< typename... >
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class Control,
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typename ParseInput,
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typename... States >
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[[nodiscard]] static bool match_impl( ParseInput& in, States&&... st )
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{
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Action< Rule >::start( const_cast< const ParseInput& >( in ), st... );
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if( TAO_PEGTL_NAMESPACE::match< Rule, A, M, Action, Control >( in, st... ) ) {
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Action< Rule >::success( const_cast< const ParseInput& >( in ), st... );
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return true;
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}
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Action< Rule >::failure( const_cast< const ParseInput& >( in ), st... );
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return false;
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}
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};
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} // namespace TAO_PEGTL_NAMESPACE
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#endif
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