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29 lines
709 B
C++
29 lines
709 B
C++
#pragma once
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#include <Common/re2.h>
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#include <string_view>
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#include <vector>
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namespace DB
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{
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void checkHyperscanRegexp(const std::vector<std::string_view> & regexps, size_t max_hyperscan_regexp_length, size_t max_hyperscan_regexp_total_length);
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/// Regexp evaluation with hyperscan can be slow for certain patterns due to NFA state explosion. Try to identify such patterns on a
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/// best-effort basis.
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class SlowWithHyperscanChecker
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{
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public:
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SlowWithHyperscanChecker();
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bool isSlow(std::string_view regexp);
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private:
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bool isSlowOneRepeat(std::string_view regexp);
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bool isSlowTwoRepeats(std::string_view regexp);
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re2::RE2 searcher_one_repeat;
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re2::RE2 searcher_two_repeats;
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};
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}
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