| // Copyright 2010-2014, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef MOZC_UNIX_IBUS_SURROUNDING_TEXT_UTIL_H_ |
| #define MOZC_UNIX_IBUS_SURROUNDING_TEXT_UTIL_H_ |
| |
| #include <string> |
| |
| #include "base/port.h" |
| #include "unix/ibus/ibus_header.h" |
| |
| namespace mozc { |
| namespace ibus { |
| |
| class SurroundingTextUtil { |
| public: |
| // Calculates |from| - |to| and stores the result into |delta| with |
| // checking integer overflow. |
| // Returns true when neither |abs(delta)| nor |-delta| does not cause |
| // integer overflow, that is, |delta| is in a safe range. |
| // Returns false otherwise. |
| static bool GetSafeDelta(guint from, guint to, int32 *delta); |
| |
| // Returns true if |
| // 1. |surrounding_text| contains |selected_text| |
| // from |cursor_pos| to |*anchor_pos|. |
| // or, |
| // 2. |surrounding_text| contains |selected_text| |
| // from |*anchor_pos| to |cursor_pos|. |
| // with calculating |*anchor_pos|, |
| // where |cursor_pos| and |*anchor_pos| are counts of Unicode characters. |
| // When both 1) and 2) are satisfied, this function calculates |
| // |*anchor_pos| for case 1). |
| // Otherwise returns false. |
| static bool GetAnchorPosFromSelection( |
| const string &surrounding_text, |
| const string &selected_text, |
| guint cursor_pos, |
| guint *anchor_pos); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SurroundingTextUtil); |
| }; |
| |
| } // namespace ibus |
| } // namespace mozc |
| |
| #endif // MOZC_UNIX_IBUS_SURROUNDING_TEXT_UTIL_H_ |