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89 lines
2.4 KiB
C++
89 lines
2.4 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_BYTES_HPP
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#define TAO_PEGTL_CONTRIB_LIMIT_BYTES_HPP
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#include <algorithm>
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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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template< std::size_t Maximum, typename MemoryInput >
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struct [[nodiscard]] bytes_guard
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{
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MemoryInput& m_in;
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const char* m_end;
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explicit bytes_guard( MemoryInput& in_in ) noexcept
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: m_in( in_in ),
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m_end( in_in.end() )
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{
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m_in.private_set_end( m_in.begin() + std::min( m_in.size(), Maximum ) );
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}
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bytes_guard( bytes_guard&& ) = delete;
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bytes_guard( const bytes_guard& ) = delete;
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~bytes_guard()
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{
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m_in.private_set_end( m_end );
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}
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bytes_guard& operator=( bytes_guard&& ) = delete;
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bytes_guard& operator=( const bytes_guard& ) = delete;
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};
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// C++17 does not allow for partial deduction guides.
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} // namespace internal
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template< std::size_t Maximum >
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struct limit_bytes
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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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internal::bytes_guard< Maximum, ParseInput > bg( in );
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if( TAO_PEGTL_NAMESPACE::match< Rule, A, M, Action, Control >( in, st... ) ) {
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if( in.empty() && ( bg.m_end != in.current() ) ) {
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#if defined( __cpp_exceptions )
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throw TAO_PEGTL_NAMESPACE::parse_error( "maximum allowed rule consumption reached", in );
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#else
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std::fputs( "maximum allowed rule consumption reached\n", stderr );
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std::terminate();
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#endif
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}
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return true;
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}
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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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