#include "codepoint_iterator.h" #include "utility.h" namespace UTF8 { CodepointIterator::CodepointIterator(std::string::const_iterator iter): iterator_(iter) { } CodepointIterator::CodepointIterator(const CodepointIterator& src): iterator_(src.iterator_) { } CodepointIterator& CodepointIterator::operator=(const CodepointIterator& src) { this->iterator_ = src.iterator_; return *this; } bool CodepointIterator::operator==(const CodepointIterator& src) const { return this->iterator_ == src.iterator_; } bool CodepointIterator::operator!=(const CodepointIterator& src) const { return this->iterator_ != src.iterator_; } bool CodepointIterator::operator==( const std::string::const_iterator& src) const { return this->iterator_ == src; } bool CodepointIterator::operator!=( const std::string::const_iterator& src) const { return this->iterator_ != src; } std::ptrdiff_t CodepointIterator::operator-( const std::string::const_iterator& src) const { return this->iterator_ - src; } char32_t CodepointIterator::operator*() { std::uint8_t currByte = *(this->iterator_); char32_t codePoint = 0; if ( match(currByte, dtl::CodeUnitType::CONTINUATION) ) { if ( match(currByte, dtl::CodeUnitType::THREE) ) { if ( match(currByte, dtl::CodeUnitType::FOUR) ) { dtl::write(codePoint, currByte, dtl::CodePoint::FOUR, 18); dtl::write(codePoint, *(this->iterator_ + 1), dtl::CodePoint::CONTINUATION, 12); dtl::write(codePoint, *(this->iterator_ + 2), dtl::CodePoint::CONTINUATION, 6); dtl::write(codePoint, *(this->iterator_ + 3), dtl::CodePoint::CONTINUATION, 0); } else { dtl::write(codePoint, currByte, dtl::CodePoint::THREE, 12); dtl::write(codePoint, *(this->iterator_ + 1), dtl::CodePoint::CONTINUATION, 6); dtl::write(codePoint, *(this->iterator_ + 2), dtl::CodePoint::CONTINUATION, 0); } } else { dtl::write(codePoint, currByte, dtl::CodePoint::TWO, 6); dtl::write(codePoint, *(this->iterator_ + 1), dtl::CodePoint::CONTINUATION, 0); } } else { codePoint = currByte; } return codePoint; } CodepointIterator& CodepointIterator::operator++() { std::uint8_t currByte(*(this->iterator_)); std::string::difference_type offset(1); if ( match(currByte, dtl::CodeUnitType::CONTINUATION) ) { if ( match(currByte, dtl::CodeUnitType::THREE) ) { if ( match(currByte, dtl::CodeUnitType::FOUR) ) { offset = 4; } else { offset = 3; } } else { offset = 2; } } this->iterator_ += offset; return *this; } CodepointIterator& CodepointIterator::operator--() { this->iterator_.operator--(); if ( match(*(this->iterator_), dtl::CodeUnitType::CONTINUATION) ) { this->iterator_.operator--(); if ( !match(*(this->iterator_), dtl::CodeUnitType::LEADING) ) { this->iterator_.operator--(); if ( !match(*(this->iterator_), dtl::CodeUnitType::LEADING) ) { this->iterator_.operator--(); if ( !match(*(this->iterator_), dtl::CodeUnitType::LEADING) ) { throw codepoint_invalid(); } } } } return *this; } CodepointIterator CodepointIterator::operator++(int) { CodepointIterator oldIter(*this); this->operator++(); return oldIter; } CodepointIterator CodepointIterator::operator--(int) { CodepointIterator oldIter(*this); this->operator--(); return oldIter; } }