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f85c4cd79f
Update string_iterator.c3 to include extra convenience methods Added peek: returns the next character without incrementing current Added has_next: checks if the iterator has another element Added get: gets the current element (the same one that was returned with the previous call to next).
50 lines
1.2 KiB
Plaintext
50 lines
1.2 KiB
Plaintext
module std::core::string::iterator;
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struct StringIterator
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{
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String utf8;
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usz current;
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}
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fn void StringIterator.reset(&self)
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{
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self.current = 0;
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}
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fn Char32! StringIterator.next(&self)
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{
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usz len = self.utf8.len;
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usz current = self.current;
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if (current >= len) return IteratorResult.NO_MORE_ELEMENT?;
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usz read = (len - current < 4 ? len - current : 4);
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Char32 res = conv::utf8_to_char32(&self.utf8[current], &read)!;
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self.current += read;
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return res;
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}
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fn Char32! StringIterator.peek(&self)
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{
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usz len = self.utf8.len;
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usz current = self.current;
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if (current >= len) return IteratorResult.NO_MORE_ELEMENT?;
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usz read = (len - current < 4 ? len - current : 4);
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Char32 res = conv::utf8_to_char32(&self.utf8[current], &read)!;
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return res;
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}
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fn bool StringIterator.has_next(&self)
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{
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return self.current < self.utf8.len;
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}
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fn Char32! StringIterator.get(&self)
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{
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usz len = self.utf8.len;
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usz current = self.current;
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usz read = (len - current < 4 ? len - current : 4);
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usz index = current > read ? current - read : 0;
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if (index >= len) return IteratorResult.NO_MORE_ELEMENT?;
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Char32 res = conv::utf8_to_char32(&self.utf8[index], &read)!;
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return res;
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}
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