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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/i18n/string_search.h" | |
| 6 #include "base/logging.h" | |
| 7 | |
| 8 #include "third_party/icu/source/i18n/unicode/usearch.h" | |
| 9 | |
| 10 namespace base { | |
| 11 namespace i18n { | |
| 12 | |
| 13 FixedPatternStringSearchIgnoringCaseAndAccents:: | |
| 14 FixedPatternStringSearchIgnoringCaseAndAccents(const string16& find_this) | |
| 15 : find_this_(find_this) { | |
| 16 // usearch_open requires a valid string argument to be searched, even if we | |
| 17 // want to set it by usearch_setText afterwards. So, supplying a dummy text. | |
| 18 const string16& dummy = find_this_; | |
| 19 | |
| 20 UErrorCode status = U_ZERO_ERROR; | |
| 21 search_ = usearch_open(find_this_.data(), find_this_.size(), | |
| 22 dummy.data(), dummy.size(), | |
| 23 uloc_getDefault(), | |
| 24 NULL, // breakiter | |
| 25 &status); | |
| 26 if (U_SUCCESS(status)) { | |
| 27 UCollator* collator = usearch_getCollator(search_); | |
| 28 ucol_setStrength(collator, UCOL_PRIMARY); | |
| 29 usearch_reset(search_); | |
| 30 } | |
| 31 } | |
| 32 | |
| 33 FixedPatternStringSearchIgnoringCaseAndAccents:: | |
| 34 ~FixedPatternStringSearchIgnoringCaseAndAccents() { | |
| 35 if (search_) | |
| 36 usearch_close(search_); | |
| 37 } | |
| 38 | |
| 39 bool FixedPatternStringSearchIgnoringCaseAndAccents::Search( | |
| 40 const string16& in_this, size_t* match_index, size_t* match_length) { | |
| 41 UErrorCode status = U_ZERO_ERROR; | |
| 42 usearch_setText(search_, in_this.data(), in_this.size(), &status); | |
| 43 | |
| 44 // Default to basic substring search if usearch fails. According to | |
| 45 // http://icu-project.org/apiref/icu4c/usearch_8h.html, usearch_open will fail | |
| 46 // if either |find_this| or |in_this| are empty. In either case basic | |
| 47 // substring search will give the correct return value. | |
| 48 if (!U_SUCCESS(status)) { | |
| 49 size_t index = in_this.find(find_this_); | |
| 50 if (index == string16::npos) { | |
| 51 return false; | |
| 52 } else { | |
| 53 if (match_index) | |
| 54 *match_index = index; | |
| 55 if (match_length) | |
| 56 *match_length = find_this_.size(); | |
| 57 return true; | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 int32_t index = usearch_first(search_, &status); | |
| 62 if (!U_SUCCESS(status) || index == USEARCH_DONE) | |
| 63 return false; | |
| 64 if (match_index) | |
| 65 *match_index = static_cast<size_t>(index); | |
| 66 if (match_length) | |
| 67 *match_length = static_cast<size_t>(usearch_getMatchedLength(search_)); | |
| 68 return true; | |
| 69 } | |
| 70 | |
| 71 bool StringSearchIgnoringCaseAndAccents(const string16& find_this, | |
| 72 const string16& in_this, | |
| 73 size_t* match_index, | |
| 74 size_t* match_length) { | |
| 75 return FixedPatternStringSearchIgnoringCaseAndAccents(find_this).Search( | |
| 76 in_this, match_index, match_length); | |
| 77 } | |
| 78 | |
| 79 } // namespace i18n | |
| 80 } // namespace base | |
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