142 lines
2.8 KiB
C++
142 lines
2.8 KiB
C++
#ifndef utf8_iterator_hh_INCLUDED
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#define utf8_iterator_hh_INCLUDED
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#include "utf8.hh"
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namespace Kakoune
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{
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namespace utf8
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{
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// adapter for an iterator on bytes which permits to iterate
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// on unicode codepoints instead.
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template<typename Iterator,
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typename InvalidPolicy = InvalidBytePolicy::Assert>
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class utf8_iterator
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{
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public:
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utf8_iterator() = default;
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utf8_iterator(Iterator it) : m_it(std::move(it)) {}
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utf8_iterator& operator++()
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{
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m_it = utf8::next(m_it);
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invalidate_value();
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return *this;
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}
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utf8_iterator operator++(int)
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{
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utf8_iterator save = *this;
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++*this;
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return save;
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}
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utf8_iterator& operator--()
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{
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m_it = utf8::previous(m_it);
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invalidate_value();
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return *this;
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}
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utf8_iterator operator--(int)
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{
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utf8_iterator save = *this;
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--*this;
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return save;
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}
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utf8_iterator operator+(CharCount count) const
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{
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if (count < 0)
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return operator-(-count);
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utf8_iterator res = *this;
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while (count--)
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++res;
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return res;
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}
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utf8_iterator operator-(CharCount count) const
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{
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if (count < 0)
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return operator+(-count);
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utf8_iterator res = *this;
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while (count--)
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--res;
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return res;
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}
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bool operator==(const utf8_iterator& other) { return m_it == other.m_it; }
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bool operator!=(const utf8_iterator& other) { return m_it != other.m_it; }
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bool operator< (const utf8_iterator& other) const
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{
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return m_it < other.m_it;
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}
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bool operator<= (const utf8_iterator& other) const
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{
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return m_it <= other.m_it;
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}
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bool operator> (const utf8_iterator& other) const
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{
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return m_it > other.m_it;
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}
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bool operator>= (const utf8_iterator& other) const
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{
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return m_it >= other.m_it;
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}
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CharCount operator-(utf8_iterator other) const
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{
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//assert(other < *this);
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check_invariant();
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other.check_invariant();
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CharCount dist = 0;
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while (other.m_it != m_it)
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{
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++dist;
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++other;
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}
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return dist;
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}
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Codepoint operator*() const
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{
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return get_value();
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}
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const Iterator& underlying_iterator() const { return m_it; }
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Iterator& underlying_iterator() { return m_it; }
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protected:
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void check_invariant() const
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{
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// always point to a character first byte;
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// assert(is_character_start(it));
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}
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private:
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void invalidate_value() { m_value = -1; }
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Codepoint get_value() const
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{
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if (m_value == -1)
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m_value = utf8::codepoint<InvalidPolicy>(m_it);
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return m_value;
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}
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Iterator m_it;
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mutable Codepoint m_value = -1;
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};
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}
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}
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#endif // utf8_iterator_hh_INCLUDED
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