| /* |
| * Copyright (C) Research In Motion Limited 2011. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_TEXT_ITERATOR_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_TEXT_ITERATOR_H_ |
| |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/text/character_names.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| |
| namespace blink { |
| |
| class PLATFORM_EXPORT UTF16TextIterator { |
| USING_FAST_MALLOC(UTF16TextIterator); |
| |
| public: |
| // The passed in UChar pointer starts at 'offset'. The iterator operates on |
| // the range [offset, endOffset]. |
| // 'length' denotes the maximum length of the UChar array, which might exceed |
| // 'endOffset'. |
| UTF16TextIterator(const UChar*, int length); |
| |
| inline bool Consume(UChar32& character) { |
| if (offset_ >= length_) |
| return false; |
| |
| character = *characters_; |
| current_glyph_length_ = 1; |
| if (!U16_IS_SURROGATE(character)) |
| return true; |
| |
| return ConsumeSurrogatePair(character); |
| } |
| |
| void Advance() { |
| characters_ += current_glyph_length_; |
| offset_ += current_glyph_length_; |
| } |
| |
| int Offset() const { return offset_; } |
| const UChar* Characters() const { return characters_; } |
| const UChar* GlyphEnd() const { return characters_ + current_glyph_length_; } |
| |
| private: |
| bool IsValidSurrogatePair(UChar32&); |
| bool ConsumeSurrogatePair(UChar32&); |
| void ConsumeMultipleUChar(); |
| |
| const UChar* characters_; |
| const UChar* characters_end_; |
| int offset_; |
| int length_; |
| unsigned current_glyph_length_; |
| |
| DISALLOW_COPY_AND_ASSIGN(UTF16TextIterator); |
| }; |
| |
| } // namespace blink |
| |
| #endif |