94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_I18N_STRING_SEARCH_H_
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#define BASE_I18N_STRING_SEARCH_H_
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#include <stddef.h>
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#include "base/i18n/base_i18n_export.h"
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#include "base/strings/string16.h"
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struct UStringSearch;
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namespace base {
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namespace i18n {
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// Returns true if |in_this| contains |find_this|. If |match_index| or
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// |match_length| are non-NULL, they are assigned the start position and total
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// length of the match.
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//
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// Only differences between base letters are taken into consideration. Case and
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// accent differences are ignored. Please refer to 'primary level' in
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// http://userguide.icu-project.org/collation/concepts for additional details.
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BASE_I18N_EXPORT
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bool StringSearchIgnoringCaseAndAccents(const string16& find_this,
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const string16& in_this,
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size_t* match_index,
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size_t* match_length);
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// Returns true if |in_this| contains |find_this|. If |match_index| or
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// |match_length| are non-NULL, they are assigned the start position and total
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// length of the match.
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//
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// When |case_sensitive| is false, only differences between base letters are
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// taken into consideration. Case and accent differences are ignored.
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// Please refer to 'primary level' in
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// http://userguide.icu-project.org/collation/concepts for additional details.
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// When |forward_search| is true, finds the first instance of |find_this|,
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// otherwise finds the last instance
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BASE_I18N_EXPORT
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bool StringSearch(const string16& find_this,
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const string16& in_this,
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size_t* match_index,
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size_t* match_length,
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bool case_sensitive,
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bool forward_search);
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// This class is for speeding up multiple StringSearch()
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// with the same |find_this| argument. |find_this| is passed as the constructor
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// argument, and precomputation for searching is done only at that time.
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class BASE_I18N_EXPORT FixedPatternStringSearch {
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public:
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explicit FixedPatternStringSearch(const string16& find_this,
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bool case_sensitive);
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~FixedPatternStringSearch();
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// Returns true if |in_this| contains |find_this|. If |match_index| or
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// |match_length| are non-NULL, they are assigned the start position and total
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// length of the match.
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bool Search(const string16& in_this,
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size_t* match_index,
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size_t* match_length,
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bool forward_search);
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private:
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string16 find_this_;
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UStringSearch* search_;
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};
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// This class is for speeding up multiple StringSearchIgnoringCaseAndAccents()
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// with the same |find_this| argument. |find_this| is passed as the constructor
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// argument, and precomputation for searching is done only at that time.
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class BASE_I18N_EXPORT FixedPatternStringSearchIgnoringCaseAndAccents {
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public:
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explicit FixedPatternStringSearchIgnoringCaseAndAccents(
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const string16& find_this);
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// Returns true if |in_this| contains |find_this|. If |match_index| or
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// |match_length| are non-NULL, they are assigned the start position and total
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// length of the match.
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bool Search(const string16& in_this,
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size_t* match_index,
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size_t* match_length);
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private:
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FixedPatternStringSearch base_search_;
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};
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} // namespace i18n
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} // namespace base
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#endif // BASE_I18N_STRING_SEARCH_H_
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