4e9d5a7f7a
* add volnitsky substr algorithm * replace std::search with volnitsky search algorithm in StringSearch * optimize substring for constant_substring_fn case use long run length search for performance
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <cstring>
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#include <functional>
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#include <vector>
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#include "common/logging.h"
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#include "runtime/string_value.h"
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#include "vec/common/volnitsky.h"
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namespace doris {
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class StringSearch {
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public:
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virtual ~StringSearch() {}
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StringSearch() : _pattern(nullptr) {}
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StringSearch(const StringValue* pattern) { set_pattern(pattern); }
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void set_pattern(const StringValue* pattern) {
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_pattern = pattern;
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_vol_searcher.reset(new Volnitsky(pattern->ptr, pattern->len));
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}
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// search for this pattern in str.
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// Returns the offset into str if the pattern exists
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// Returns -1 if the pattern is not found
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int search(const StringValue* str) const {
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auto it = search(str->ptr, str->len);
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if (it == str->ptr + str->len) {
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return -1;
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} else {
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return it - str->ptr;
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}
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}
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// search for this pattern in str.
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// Returns the offset into str if the pattern exists
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// Returns str+len if the pattern is not found
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const char* search(char* str, size_t len) const {
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if (!str || !_pattern || _pattern->len == 0) {
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return str + len;
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}
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return _vol_searcher->search(str, len);
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}
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inline size_t get_pattern_length() { return _pattern ? _pattern->len : 0; }
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private:
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const StringValue* _pattern;
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std::unique_ptr<Volnitsky> _vol_searcher;
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};
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} // namespace doris
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