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      1 // Copyright (C) 2013 Google Inc. All rights reserved.
      2 //
      3 // Redistribution and use in source and binary forms, with or without
      4 // modification, are permitted provided that the following conditions are
      5 // met:
      6 //
      7 //    * Redistributions of source code must retain the above copyright
      8 // notice, this list of conditions and the following disclaimer.
      9 //    * Redistributions in binary form must reproduce the above
     10 // copyright notice, this list of conditions and the following disclaimer
     11 // in the documentation and/or other materials provided with the
     12 // distribution.
     13 //    * Neither the name of Google Inc. nor the names of its
     14 // contributors may be used to endorse or promote products derived from
     15 // this software without specific prior written permission.
     16 //
     17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 #ifndef TextRunIterator_h
     30 #define TextRunIterator_h
     31 
     32 #include "platform/text/TextRun.h"
     33 
     34 namespace blink {
     35 
     36 class TextRunIterator {
     37 public:
     38     TextRunIterator()
     39         : m_textRun(0)
     40         , m_offset(0)
     41     {
     42     }
     43 
     44     TextRunIterator(const TextRun* textRun, unsigned offset)
     45         : m_textRun(textRun)
     46         , m_offset(offset)
     47     {
     48     }
     49 
     50     TextRunIterator(const TextRunIterator& other)
     51         : m_textRun(other.m_textRun)
     52         , m_offset(other.m_offset)
     53     {
     54     }
     55 
     56     unsigned offset() const { return m_offset; }
     57     void increment() { m_offset++; }
     58     bool atEnd() const { return !m_textRun || m_offset >= m_textRun->length(); }
     59     UChar current() const { return (*m_textRun)[m_offset]; }
     60     WTF::Unicode::Direction direction() const { return atEnd() ? WTF::Unicode::OtherNeutral : WTF::Unicode::direction(current()); }
     61     bool atParagraphSeparator() const { return current() == '\n'; }
     62 
     63     bool operator==(const TextRunIterator& other)
     64     {
     65         return m_offset == other.m_offset && m_textRun == other.m_textRun;
     66     }
     67 
     68     bool operator!=(const TextRunIterator& other) { return !operator==(other); }
     69 
     70 private:
     71     const TextRun* m_textRun;
     72     int m_offset;
     73 };
     74 
     75 
     76 } // namespace blink
     77 
     78 #endif // TextRunIterator_h
     79