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f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
/*
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* Copyright (C) 2019-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include "bytes.hh"
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#include <memory>
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/// Implements <code>text LIKE pattern</code>.
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///
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/// The pattern is a string of characters with two wildcards:
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/// - '_' matches any single character
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/// - '%' matches any substring (including an empty string)
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/// - '\' escapes the next pattern character, so it matches verbatim
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/// - any other pattern character matches itself
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///
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/// The whole text must match the pattern; thus <code>'abc' LIKE 'a'</code> doesn't match, but
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/// <code>'abc' LIKE 'a%'</code> matches.
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class like_matcher {
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class impl;
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std::unique_ptr<impl> _impl;
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public:
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/// Compiles \c pattern and stores the result.
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///
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/// \param pattern UTF-8 encoded pattern with wildcards '_' and '%'.
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explicit like_matcher(bytes_view pattern);
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like_matcher(like_matcher&&) noexcept; // Must be defined in .cc, where class impl is known.
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~like_matcher();
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/// Runs the compiled pattern on \c text.
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///
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/// \return true iff text matches constructor's pattern.
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bool operator()(bytes_view text) const;
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/// Resets pattern if different from the current one.
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void reset(bytes_view pattern);
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};
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