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      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_TOKENIZED_STRING_CHAR_ITERATOR_H_
      6 #define UI_APP_LIST_SEARCH_TOKENIZED_STRING_CHAR_ITERATOR_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "ui/app_list/app_list_export.h"
     11 #include "ui/app_list/search/tokenized_string.h"
     12 
     13 namespace base {
     14 namespace i18n {
     15 class UTF16CharIterator;
     16 }
     17 }
     18 
     19 namespace app_list {
     20 
     21 // An UTF16 char iterator for a TokenizedString.
     22 class APP_LIST_EXPORT TokenizedStringCharIterator {
     23  public:
     24   struct State {
     25     State();
     26     State(size_t token_index, int char_index);
     27 
     28     size_t token_index;
     29     int32 char_index;
     30   };
     31 
     32   // Requires |tokenized| out-lives this iterator.
     33   explicit TokenizedStringCharIterator(const TokenizedString& tokenized);
     34   ~TokenizedStringCharIterator();
     35 
     36   // Advances to the next char. Returns false if there is no next char.
     37   bool NextChar();
     38 
     39   // Advances to the first char of the next token. Returns false if there is
     40   // no next token.
     41   bool NextToken();
     42 
     43   // Returns the current char if there is one. Otherwise, returns 0.
     44   int32 Get() const;
     45 
     46   // Returns the array index in original text of the tokenized string that is
     47   // passed in constructor.
     48   int32 GetArrayPos() const;
     49 
     50   // Returns the number of UTF16 code units for the current char.
     51   size_t GetCharSize() const;
     52 
     53   // Returns true if the current char is the first char of the current token.
     54   bool IsFirstCharOfToken() const;
     55 
     56   // Helpers to get and restore the iterator's state.
     57   State GetState() const;
     58   void SetState(const State& state);
     59 
     60   // Returns true if the iterator is at the end.
     61   bool end() const { return !current_token_iter_; }
     62 
     63  private:
     64   void CreateTokenCharIterator();
     65 
     66   const TokenizedString::Tokens& tokens_;
     67   const TokenizedString::Mappings& mappings_;
     68 
     69   size_t current_token_;
     70   scoped_ptr<base::i18n::UTF16CharIterator> current_token_iter_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(TokenizedStringCharIterator);
     73 };
     74 
     75 }  // namespace app_list
     76 
     77 #endif  // UI_APP_LIST_SEARCH_TOKENIZED_STRING_CHAR_ITERATOR_H_
     78