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84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
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// Copyright (c) 2021-2022 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_LIMIT_DEPTH_HPP
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#define TAO_PEGTL_CONTRIB_LIMIT_DEPTH_HPP
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#include "../apply_mode.hpp"
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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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#include "../rewind_mode.hpp"
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#if defined( __cpp_exceptions )
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#include "../parse_error.hpp"
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#else
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#include <cstdio>
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#include <exception>
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#endif
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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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struct [[nodiscard]] depth_guard
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{
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std::size_t& m_depth;
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explicit depth_guard( std::size_t& depth ) noexcept
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: m_depth( depth )
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{
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++m_depth;
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}
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depth_guard( depth_guard&& ) = delete;
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depth_guard( const depth_guard& ) = delete;
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~depth_guard()
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{
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--m_depth;
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}
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depth_guard& operator=( depth_guard&& ) = delete;
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depth_guard& operator=( const depth_guard& ) = delete;
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};
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} // namespace internal
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template< std::size_t Maximum >
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struct limit_depth
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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 constexpr( Control< Rule >::enable ) {
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const internal::depth_guard dg( in.private_depth );
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if( in.private_depth > Maximum ) {
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#if defined( __cpp_exceptions )
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throw TAO_PEGTL_NAMESPACE::parse_error( "maximum parser rule nesting depth exceeded", in );
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#else
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std::fputs( "maximum parser rule nesting depth exceeded\n", stderr );
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std::terminate();
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#endif
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}
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return TAO_PEGTL_NAMESPACE::match< Rule, A, M, Action, Control >( in, st... );
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}
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else {
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return TAO_PEGTL_NAMESPACE::match< Rule, A, M, Action, Control >( in, st... );
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}
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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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