mirror of
https://github.com/c3lang/c3c.git
synced 2026-02-27 20:11:17 +00:00
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
C
50 lines
1.2 KiB
C
module std::core::string::iterator;
|
|
|
|
struct StringIterator
|
|
{
|
|
String utf8;
|
|
usz current;
|
|
}
|
|
|
|
fn void StringIterator.reset(&self)
|
|
{
|
|
self.current = 0;
|
|
}
|
|
|
|
fn Char32! StringIterator.next(&self)
|
|
{
|
|
usz len = self.utf8.len;
|
|
usz current = self.current;
|
|
if (current >= len) return IteratorResult.NO_MORE_ELEMENT?;
|
|
usz read = (len - current < 4 ? len - current : 4);
|
|
Char32 res = conv::utf8_to_char32(&self.utf8[current], &read)!;
|
|
self.current += read;
|
|
return res;
|
|
}
|
|
|
|
fn Char32! StringIterator.peek(&self)
|
|
{
|
|
usz len = self.utf8.len;
|
|
usz current = self.current;
|
|
if (current >= len) return IteratorResult.NO_MORE_ELEMENT?;
|
|
usz read = (len - current < 4 ? len - current : 4);
|
|
Char32 res = conv::utf8_to_char32(&self.utf8[current], &read)!;
|
|
return res;
|
|
}
|
|
|
|
fn bool StringIterator.has_next(&self)
|
|
{
|
|
return self.current < self.utf8.len;
|
|
}
|
|
|
|
fn Char32! StringIterator.get(&self)
|
|
{
|
|
usz len = self.utf8.len;
|
|
usz current = self.current;
|
|
usz read = (len - current < 4 ? len - current : 4);
|
|
usz index = current > read ? current - read : 0;
|
|
if (index >= len) return IteratorResult.NO_MORE_ELEMENT?;
|
|
Char32 res = conv::utf8_to_char32(&self.utf8[index], &read)!;
|
|
return res;
|
|
}
|