81 lines
2.7 KiB
C++
81 lines
2.7 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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#include "base/i18n/string_search.h"
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#include "base/logging.h"
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#include "third_party/icu/source/i18n/unicode/usearch.h"
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namespace base {
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namespace i18n {
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FixedPatternStringSearchIgnoringCaseAndAccents::
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FixedPatternStringSearchIgnoringCaseAndAccents(const string16& find_this)
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: find_this_(find_this) {
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// usearch_open requires a valid string argument to be searched, even if we
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// want to set it by usearch_setText afterwards. So, supplying a dummy text.
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const string16& dummy = find_this_;
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UErrorCode status = U_ZERO_ERROR;
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search_ = usearch_open(find_this_.data(), find_this_.size(),
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dummy.data(), dummy.size(),
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uloc_getDefault(),
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NULL, // breakiter
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&status);
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if (U_SUCCESS(status)) {
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UCollator* collator = usearch_getCollator(search_);
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ucol_setStrength(collator, UCOL_PRIMARY);
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usearch_reset(search_);
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}
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}
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FixedPatternStringSearchIgnoringCaseAndAccents::
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~FixedPatternStringSearchIgnoringCaseAndAccents() {
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if (search_)
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usearch_close(search_);
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}
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bool FixedPatternStringSearchIgnoringCaseAndAccents::Search(
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const string16& in_this, size_t* match_index, size_t* match_length) {
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UErrorCode status = U_ZERO_ERROR;
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usearch_setText(search_, in_this.data(), in_this.size(), &status);
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// Default to basic substring search if usearch fails. According to
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// http://icu-project.org/apiref/icu4c/usearch_8h.html, usearch_open will fail
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// if either |find_this| or |in_this| are empty. In either case basic
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// substring search will give the correct return value.
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if (!U_SUCCESS(status)) {
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size_t index = in_this.find(find_this_);
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if (index == string16::npos) {
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return false;
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} else {
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if (match_index)
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*match_index = index;
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if (match_length)
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*match_length = find_this_.size();
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return true;
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}
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}
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int32_t index = usearch_first(search_, &status);
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if (!U_SUCCESS(status) || index == USEARCH_DONE)
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return false;
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if (match_index)
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*match_index = static_cast<size_t>(index);
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if (match_length)
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*match_length = static_cast<size_t>(usearch_getMatchedLength(search_));
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return true;
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}
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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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return FixedPatternStringSearchIgnoringCaseAndAccents(find_this).Search(
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in_this, match_index, match_length);
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}
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} // namespace i18n
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} // namespace base
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