Repo created

TMessagesProj/jni/voip/webrtc/base/i18n/string_search.h

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