base/i18n: Class for efficiently searching the same query over many texts.

base/i18n/string_search.h

Index: base/i18n/string_search.h
diff --git a/base/i18n/string_search.h b/base/i18n/string_search.h
index 9d18631039831acbb30850f3cdcd8393899b9501..138606f8c60c3fceaa1c70b2746e26e7f3a10b29 100644
--- a/base/i18n/string_search.h
+++ b/base/i18n/string_search.h
@@ -8,6 +8,8 @@
 #include "base/i18n/base_i18n_export.h"
 #include "base/strings/string16.h"
 
+struct UStringSearch;
+
 namespace base {
 namespace i18n {
 
@@ -24,6 +26,27 @@ BASE_I18N_EXPORT
                                             size_t* match_index,
                                             size_t* match_length);
 
+// 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 timing.
+class BASE_I18N_EXPORT FixedPatternStringSearchIgnoringCaseAndAccents {
+ public:
+  explicit FixedPatternStringSearchIgnoringCaseAndAccents(
+      const string16& find_this);
+  ~FixedPatternStringSearchIgnoringCaseAndAccents();
+
+  // 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:
+  string16 find_this_;
+  UStringSearch* search_;
+};
+
 }  // namespace i18n
 }  // namespace base