1 // Copyright 2013 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 #ifndef UI_APP_LIST_SEARCH_TERM_BREAK_ITERATOR_H_ 6 #define UI_APP_LIST_SEARCH_TERM_BREAK_ITERATOR_H_ 7 8 #include "base/basictypes.h" 9 #include "base/memory/scoped_ptr.h" 10 #include "base/strings/string16.h" 11 #include "ui/app_list/app_list_export.h" 12 13 namespace base { 14 namespace i18n { 15 class UTF16CharIterator; 16 } 17 } 18 19 namespace app_list { 20 21 // TermBreakIterator breaks terms out of a word. Terms are broken on 22 // camel case boundaries and alpha/number boundaries. Numbers are defined 23 // as [0-9\.,]+. 24 // e.g. 25 // CamelCase -> Camel, Case 26 // Python2.7 -> Python, 2.7 27 class APP_LIST_EXPORT TermBreakIterator { 28 public: 29 // Note that |word| must out live this iterator. 30 explicit TermBreakIterator(const base::string16& word); 31 ~TermBreakIterator(); 32 33 // Advance to the next term. Returns false if at the end of the word. 34 bool Advance(); 35 36 // Returns the current term, which is the substr of |word_| in range 37 // [prev_, pos_). 38 const base::string16 GetCurrentTerm() const; 39 40 size_t prev() const { return prev_; } 41 size_t pos() const { return pos_; } 42 43 static const size_t npos = static_cast<size_t>(-1); 44 45 private: 46 enum State { 47 STATE_START, // Initial state 48 STATE_NUMBER, // Current char is a number [0-9\.,]. 49 STATE_UPPER, // Current char is upper case. 50 STATE_LOWER, // Current char is lower case. 51 STATE_CHAR, // Current char has no case, e.g. a cjk char. 52 STATE_LAST, 53 }; 54 55 // Returns new state for given |ch|. 56 State GetNewState(base::char16 ch); 57 58 const base::string16& word_; 59 size_t prev_; 60 size_t pos_; 61 62 scoped_ptr<base::i18n::UTF16CharIterator> iter_; 63 State state_; 64 65 DISALLOW_COPY_AND_ASSIGN(TermBreakIterator); 66 }; 67 68 } // namespace app_list 69 70 #endif // UI_APP_LIST_SEARCH_TERM_BREAK_ITERATOR_H_ 71
