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improved scanner interface

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Orange
2025-10-06 14:21:52 +03:00
parent 131fd891b0
commit 170f969697
2 changed files with 39 additions and 25 deletions
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39
include/omath/utility/pattern_scan.hpp
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@@ -5,9 +5,9 @@
#pragma once
#include <expected>
#include <optional>
#include <span>
#include <string_view>
#include <vector>
#include <span>
// ReSharper disable once CppInconsistentNaming
class unit_test_pattern_scan_read_test_Test;
@@ -20,7 +20,6 @@ class unit_test_pattern_scan_corner_case_3_Test;
// ReSharper disable once CppInconsistentNaming
class unit_test_pattern_scan_corner_case_4_Test;
namespace omath
{
enum class PatternScanError
@@ -34,10 +33,42 @@ namespace omath
friend unit_test_pattern_scan_corner_case_2_Test;
friend unit_test_pattern_scan_corner_case_3_Test;
friend unit_test_pattern_scan_corner_case_4_Test;
public:
[[nodiscard]]
static std::optional<std::span<std::byte>::const_iterator>
scan_for_pattern(const std::string_view& pattern, const std::span<std::byte>& range);
static std::optional<std::span<std::byte>::const_iterator> scan_for_pattern(const std::span<std::byte>& range,
const std::string_view& pattern);
template<class IteratorType>
static IteratorType scan_for_pattern(const IteratorType& begin, const IteratorType& end,
const std::string_view& pattern)
{
const auto parsed_pattern = parse_pattern(pattern);
if (!parsed_pattern) [[unlikely]]
return end;
const auto whole_range_size = static_cast<std::ptrdiff_t>(std::distance(begin, end));
const std::ptrdiff_t scan_size = whole_range_size - static_cast<std::ptrdiff_t>(pattern.size());
for (std::ptrdiff_t i = 0; i < scan_size; i++)
{
bool found = true;
for (std::ptrdiff_t j = 0; j < static_cast<std::ptrdiff_t>(parsed_pattern->size()); j++)
{
found = parsed_pattern->at(j) == std::nullopt || parsed_pattern->at(j) == *(begin + i + j);
if (!found)
break;
}
if (found)
return begin + i;
}
return end;
}
private:
[[nodiscard]]
static std::expected<std::vector<std::optional<std::byte>>, PatternScanError>