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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 "dfa_string_comparator.h"
#include <vespa/vespalib/fuzzy/fuzzy_matching_algorithm.h>
#include <vespa/vespalib/regex/regex.h>
namespace vespalib { class FuzzyMatcher; }
namespace search { class QueryTermUCS4; }
namespace search::attribute {
class DfaFuzzyMatcher;
/**
* Helper class for search context when scanning string fields
* It handles different search settings like prefix, regex and cased/uncased.
*/
class StringSearchHelper {
public:
using FuzzyMatcher = vespalib::FuzzyMatcher;
StringSearchHelper(QueryTermUCS4 & qTerm, bool cased,
vespalib::FuzzyMatchingAlgorithm fuzzy_matching_algorithm = vespalib::FuzzyMatchingAlgorithm::BruteForce);
StringSearchHelper(StringSearchHelper&&) noexcept;
StringSearchHelper(const StringSearchHelper &) = delete;
StringSearchHelper & operator =(const StringSearchHelper &) = delete;
~StringSearchHelper();
bool isMatch(const char *src) const noexcept;
bool isPrefix() const noexcept { return _isPrefix; }
bool isRegex() const noexcept { return _isRegex; }
bool isCased() const noexcept { return _isCased; }
bool isFuzzy() const noexcept { return _isFuzzy; }
const vespalib::Regex & getRegex() const noexcept { return _regex; }
const FuzzyMatcher& getFuzzyMatcher() const noexcept { return *_fuzzyMatcher; }
template <typename DictionaryConstIteratorType>
bool is_fuzzy_match(const char* word, DictionaryConstIteratorType& itr, const DfaStringComparator::DataStoreType& data_store) const;
private:
using ucs4_t = uint32_t;
vespalib::Regex _regex;
std::unique_ptr<FuzzyMatcher> _fuzzyMatcher;
std::unique_ptr<DfaFuzzyMatcher> _dfa_fuzzy_matcher;
std::unique_ptr<ucs4_t[]> _ucs4;
const char * _term;
uint32_t _termLen; // measured in bytes
bool _isPrefix;
bool _isRegex;
bool _isCased;
bool _isFuzzy;
};
}
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