scan_core.hpp

// src/builtin/include/nk/builtin/scan_core.hpp
#pragma once
 
// Shared scan parse+shape core, exposed so the engine-coupled fscanf shim
// (relocated to the runtime layer) can reuse the same machinery as
// the pure sscanf. scanfEmit itself is pure — no Engine.
 
#include <nk/value/span.hpp>
#include <nk/value/value.hpp>
 
#include <cstddef>
#include <memory_resource>
#include <string>
 
namespace nk::ops {
struct SizeSpec;
}
 
namespace nk::builtin::detail {
 
// scanfCycle's run summary — matched-item count + input bytes consumed.
struct ScanfOut
{
    std::size_t count;
    std::size_t bytesConsumed;
};

void scanfEmit(const std::string &input, const std::string &fmt,
               const ::nk::ops::SizeSpec &sz, std::size_t nargout,
               Span<Value> outs, std::pmr::memory_resource *mr, ScanfOut &r);
 
} // namespace nk::builtin::detail