| // Copyright 2014 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #ifndef CORE_INCLUDE_FXCRT_FX_BIDI_H_ |
| #define CORE_INCLUDE_FXCRT_FX_BIDI_H_ |
| |
| #include "fx_system.h" |
| |
| // Processes characters and group them into segments based on text direction. |
| class CFX_BidiChar { |
| public: |
| enum Direction { NEUTRAL, LEFT, RIGHT }; |
| |
| CFX_BidiChar(); |
| ~CFX_BidiChar(); |
| |
| // Append a character and classify it as left, right, or neutral. |
| // Returns true if the character has a different direction than the |
| // existing direction to indicate there is a segment to process. |
| bool AppendChar(FX_WCHAR wch); |
| |
| // Call this after the last character has been appended. AppendChar() |
| // must not be called after this. |
| // Returns true if there is still a segment to process. |
| bool EndChar(); |
| |
| // Get information about the segment to process. |
| // The segment's start position and character count is returned in |iStart| |
| // and |iCount|, respectively. Pass in null pointers if the information is |
| // not needed. |
| // Returns the segment direction. |
| Direction GetBidiInfo(int32_t* iStart, int32_t* iCount) const; |
| |
| private: |
| void SaveCurrentStateToLastState(); |
| |
| // Position of the current segment. |
| int32_t m_iCurStart; |
| |
| // Number of characters in the current segment. |
| int32_t m_iCurCount; |
| |
| // Direction of the current segment. |
| Direction m_CurBidi; |
| |
| // Number of characters in the last segment. |
| int32_t m_iLastStart; |
| |
| // Number of characters in the last segment. |
| int32_t m_iLastCount; |
| |
| // Direction of the last segment. |
| Direction m_LastBidi; |
| }; |
| |
| #endif // CORE_INCLUDE_FXCRT_FX_BIDI_H_ |