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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#pragma once
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#include <DB/Common/OptimizedRegularExpression.h>
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#include <DB/Functions/ObjectPool.h>
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#include <DB/Functions/likePatternToRegexp.h>
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namespace ProfileEvents
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{
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extern const Event RegexpCreated;
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}
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namespace DB {
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namespace Regexps
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{
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using Regexp = OptimizedRegularExpressionImpl<false>;
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using Pool = ObjectPoolMap<Regexp, String>;
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template <bool like>
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inline Regexp createRegexp(const std::string & pattern, int flags) { return {pattern, flags}; }
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template <>
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inline Regexp createRegexp<true>(const std::string & pattern, int flags) { return {likePatternToRegexp(pattern), flags}; }
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template <bool like, bool no_capture>
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inline Pool::Pointer get(const std::string & pattern)
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{
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/// C++11 has thread-safe function-local statics on most modern compilers.
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static Pool known_regexps; /// Разные переменные для разных параметров шаблона.
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return known_regexps.get(pattern, [&pattern]
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{
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int flags = OptimizedRegularExpression::RE_DOT_NL;
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if (no_capture)
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flags |= OptimizedRegularExpression::RE_NO_CAPTURE;
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ProfileEvents::increment(ProfileEvents::RegexpCreated);
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return new Regexp{createRegexp<like>(pattern, flags)};
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});
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}
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}
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}
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