| /* |
| * Copyright (C) 2004, 2006, 2009 Apple 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: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 CharacterIterator_h |
| #define CharacterIterator_h |
| |
| #include "core/CoreExport.h" |
| #include "core/dom/Range.h" |
| #include "core/editing/Forward.h" |
| #include "core/editing/iterators/TextIterator.h" |
| #include "core/editing/iterators/TextIteratorBehavior.h" |
| #include "platform/heap/Heap.h" |
| |
| namespace blink { |
| |
| // Builds on the text iterator, adding a character position so we can walk one |
| // character at a time, or faster, as needed. Useful for searching. |
| template <typename Strategy> |
| class CORE_EXPORT CharacterIteratorAlgorithm { |
| STACK_ALLOCATED(); |
| |
| public: |
| CharacterIteratorAlgorithm( |
| const PositionTemplate<Strategy>& start, |
| const PositionTemplate<Strategy>& end, |
| const TextIteratorBehavior& = TextIteratorBehavior()); |
| explicit CharacterIteratorAlgorithm( |
| const EphemeralRangeTemplate<Strategy>&, |
| const TextIteratorBehavior& = TextIteratorBehavior()); |
| |
| void Advance(int num_characters); |
| |
| bool AtBreak() const { return at_break_; } |
| bool AtEnd() const { return text_iterator_.AtEnd(); } |
| |
| int length() const { return text_iterator_.length() - run_offset_; } |
| UChar CharacterAt(unsigned index) const { |
| return text_iterator_.CharacterAt(run_offset_ + index); |
| } |
| |
| void CopyTextTo(ForwardsTextBuffer* output); |
| |
| int CharacterOffset() const { return offset_; } |
| |
| Document* OwnerDocument() const; |
| const Node* CurrentContainer() const; |
| int StartOffset() const; |
| int EndOffset() const; |
| PositionTemplate<Strategy> StartPosition() const; |
| PositionTemplate<Strategy> EndPosition() const; |
| |
| EphemeralRangeTemplate<Strategy> CalculateCharacterSubrange(int offset, |
| int length); |
| |
| private: |
| void Initialize(); |
| |
| int offset_; |
| int run_offset_; |
| bool at_break_; |
| |
| TextIteratorAlgorithm<Strategy> text_iterator_; |
| }; |
| |
| extern template class CORE_EXTERN_TEMPLATE_EXPORT |
| CharacterIteratorAlgorithm<EditingStrategy>; |
| using CharacterIterator = CharacterIteratorAlgorithm<EditingStrategy>; |
| |
| extern template class CORE_EXTERN_TEMPLATE_EXPORT |
| CharacterIteratorAlgorithm<EditingInFlatTreeStrategy>; |
| |
| CORE_EXPORT EphemeralRange CalculateCharacterSubrange(const EphemeralRange&, |
| int character_offset, |
| int character_count); |
| |
| } // namespace blink |
| |
| #endif // CharacterIterator_h |