RenderTextWin: Break runs between any two characters that are not in the same code block

base/i18n/char_iterator.h

 // 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_CHAR_ITERATOR_H_
 #define BASE_I18N_CHAR_ITERATOR_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 15 matching lines @@
 
 namespace base {
 namespace i18n {
 
 class BASE_I18N_EXPORT UTF8CharIterator {
  public:
   // Requires |str| to live as long as the UTF8CharIterator does.
   explicit UTF8CharIterator(const std::string* str);
   ~UTF8CharIterator();
 
-  // Return the starting array index of the current character within the
+  // Returns the starting array index of the current character within the
   // string.
   int32 array_pos() const { return array_pos_; }
 
-  // Return the logical index of the current character, independent of the
+  // Returns the logical index of the current character, independent of the
   // number of bytes each character takes.
   int32 char_pos() const { return char_pos_; }
 
-  // Return the current char.
+  // Returns the current char.
   int32 get() const { return char_; }
 
   // Returns true if we're at the end of the string.
   bool end() const { return array_pos_ == len_; }
 
   // Advance to the next actual character.  Returns false if we're at the
   // end of the string.
   bool Advance();
 
+  // Set the iterator to the specified |position|. If |position| is not a code
+  // point boundary, the position is set to the beginning of the code point.
+  // Calling this function invalidates all future |char_pos()| results.
+  void SetPosition(int32 position);
+
  private:
   // The string we're iterating over.
   const uint8_t* str_;
 
   // The length of the encoded string.
   int32 len_;
 
   // Array index.
   int32 array_pos_;
 
   // The next array index.
   int32 next_pos_;
 
   // Character index.
   int32 char_pos_;
 
   // The current character.
   int32 char_;
 
   DISALLOW_COPY_AND_ASSIGN(UTF8CharIterator);
 };
 
 class BASE_I18N_EXPORT UTF16CharIterator {
  public:
   // Requires |str| to live as long as the UTF16CharIterator does.
   explicit UTF16CharIterator(const string16* str);
   UTF16CharIterator(const char16* str, size_t str_len);
   ~UTF16CharIterator();
 
-  // Return the starting array index of the current character within the
+  // Returns the starting array index of the current character within the
   // string.
   int32 array_pos() const { return array_pos_; }
 
-  // Return the logical index of the current character, independent of the
+  // Returns the logical index of the current character, independent of the
   // number of codewords each character takes.
   int32 char_pos() const { return char_pos_; }
 
-  // Return the current char.
+  // Returns the current char.
   int32 get() const { return char_; }
 
   // Returns true if we're at the end of the string.
   bool end() const { return array_pos_ == len_; }
 
   // Advance to the next actual character.  Returns false if we're at the
   // end of the string.
   bool Advance();
 
+  // Set the iterator to the specified |position|. If |position| is not a code
+  // point boundary, the position is set to the beginning of the code point.
+  // Calling this function invalidates all future |char_pos()| results.
+  void SetPosition(int32 position);
+
  private:
   // Fills in the current character we found and advances to the next
   // character, updating all flags as necessary.
   void ReadChar();
 
   // The string we're iterating over.
   const char16* str_;
 
   // The length of the encoded string.
   int32 len_;
@@ skipping 10 matching lines @@
   // The current character.
   int32 char_;
 
   DISALLOW_COPY_AND_ASSIGN(UTF16CharIterator);
 };
 
 }  // namespace i18n
 }  // namespace base
 
 #endif  // BASE_I18N_CHAR_ITERATOR_H_