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0d7457946f
No reason to disallow this. We still forbid mixing LIKE and non-LIKE relations on the same column. Fixes #5902. Signed-off-by: Dejan Mircevski <dejan@scylladb.com>
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*
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* Copyright (C) 2019 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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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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