47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
// Copyright (c) 2016 Dr. Colin Hirsch and Daniel Frey
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// Please see LICENSE for license or visit https://github.com/ColinH/PEGTL/
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#ifndef TAO_CPP_PEGTL_INTERNAL_MINUS_HH
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#define TAO_CPP_PEGTL_INTERNAL_MINUS_HH
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#include "skip_control.hh"
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#include "../apply_mode.hh"
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#include "../memory_input.hh"
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namespace tao_json_pegtl
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{
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namespace internal
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{
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template< typename M, typename S >
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struct minus
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{
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using analyze_t = typename M::analyze_t; // NOTE: S is currently ignored for analyze().
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template< apply_mode A, template< typename ... > class Action, template< typename ... > class Control, typename Input, typename ... States >
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static bool match( Input & in, States && ... st )
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{
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auto m = in.mark();
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if ( ! Control< M >::template match< A, Action, Control >( in, st ... ) ) {
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return false;
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}
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using memory_t = typename Input::memory_t;
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memory_t i2( m, in.data() );
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if ( ! Control< S >::template match< apply_mode::NOTHING, Action, Control >( i2, st ... ) ) {
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return m( true );
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}
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return m( ! i2.empty() );
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}
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};
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template< typename M, typename S >
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struct skip_control< minus< M, S > > : std::true_type {};
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} // namespace internal
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} // namespace tao_json_pegtl
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#endif
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