Source code
Revision control
Copy as Markdown
Other Tools
// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
#[diplomat::bridge]
pub mod ffi {
use alloc::boxed::Box;
use core::ops::RangeInclusive;
/// Result of a single iteration of [`CodePointRangeIterator`].
/// Logically can be considered to be an `Option<RangeInclusive<u32>>`,
///
/// `start` and `end` represent an inclusive range of code points [start, end],
/// and `done` will be true if the iterator has already finished. The last contentful
/// iteration will NOT produce a range done=true, in other words `start` and `end` are useful
/// values if and only if `done=false`.
#[diplomat::out]
pub struct CodePointRangeIteratorResult {
pub start: u32,
pub end: u32,
pub done: bool,
}
/// An iterator over code point ranges, produced by `ICU4XCodePointSetData` or
/// one of the `ICU4XCodePointMapData` types
#[diplomat::opaque]
pub struct CodePointRangeIterator<'a>(pub Box<dyn Iterator<Item = RangeInclusive<u32>> + 'a>);
impl<'a> CodePointRangeIterator<'a> {
/// Advance the iterator by one and return the next range.
///
/// If the iterator is out of items, `done` will be true
pub fn next(&mut self) -> CodePointRangeIteratorResult {
self.0
.next()
.map(|r| CodePointRangeIteratorResult {
start: *r.start(),
end: *r.end(),
done: false,
})
.unwrap_or(CodePointRangeIteratorResult {
start: 0,
end: 0,
done: true,
})
}
}
}