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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "levenshtein_dfa.h"
#include "unicode_utils.h"
#include <vector>
namespace vespalib::fuzzy {
template <typename Traits>
class ImplicitLevenshteinDfa final : public LevenshteinDfa::Impl {
const std::vector<uint32_t> _u32_str_buf; // TODO std::u32string
std::string _target_as_utf8;
std::vector<uint32_t> _target_utf8_char_offsets;
const bool _is_cased;
public:
using MatchResult = LevenshteinDfa::MatchResult;
ImplicitLevenshteinDfa(std::vector<uint32_t> str, bool is_cased)
: _u32_str_buf(std::move(str)),
_target_as_utf8(),
_target_utf8_char_offsets(),
_is_cased(is_cased)
{
precompute_utf8_target_with_offsets();
}
~ImplicitLevenshteinDfa() override = default;
[[nodiscard]] MatchResult match(std::string_view u8str) const override;
[[nodiscard]] MatchResult match(std::string_view u8str, std::string& successor_out) const override;
[[nodiscard]] MatchResult match(std::string_view u8str, std::vector<uint32_t>& successor_out) const override;
[[nodiscard]] size_t memory_usage() const noexcept override {
return _u32_str_buf.size() * sizeof(uint32_t);
}
void dump_as_graphviz(std::ostream& os) const override;
private:
void precompute_utf8_target_with_offsets();
};
}
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