| // Copyright (C) 2013 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 |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_RUN_ITERATOR_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_RUN_ITERATOR_H_ |
| |
| #include "third_party/blink/renderer/platform/text/text_run.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| namespace blink { |
| |
| class TextRunIterator { |
| DISALLOW_NEW(); |
| |
| public: |
| TextRunIterator() : text_run_(nullptr), offset_(0), length_(0) {} |
| |
| TextRunIterator(const TextRun* text_run, unsigned offset) |
| : text_run_(text_run), offset_(offset), length_(text_run_->length()) {} |
| |
| TextRunIterator(const TextRunIterator& other) |
| : text_run_(other.text_run_), |
| offset_(other.offset_), |
| length_(text_run_->length()) {} |
| |
| unsigned Offset() const { return offset_; } |
| void Increment() { offset_++; } |
| bool AtEnd() const { return offset_ >= length_; } |
| UChar Current() const { return (*text_run_)[offset_]; } |
| WTF::unicode::CharDirection Direction() const { |
| return AtEnd() ? WTF::unicode::kOtherNeutral |
| : WTF::unicode::Direction(Current()); |
| } |
| bool AtParagraphSeparator() const { return Current() == '\n'; } |
| |
| bool operator==(const TextRunIterator& other) { |
| return offset_ == other.offset_ && text_run_ == other.text_run_; |
| } |
| |
| bool operator!=(const TextRunIterator& other) { return !operator==(other); } |
| |
| private: |
| const TextRun* text_run_; |
| unsigned offset_; |
| unsigned length_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_RUN_ITERATOR_H_ |