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use std::iter;
use crate::blocks;
use crate::blocks::OsmObjs as OsmBlockObjs;
use crate::fileformat::Blob;
use crate::objects::OsmObj;
use crate::osmformat::PrimitiveBlock;
self_cell::self_cell!(
struct OsmBlobObjs {
owner: PrimitiveBlock,
#[covariant]
dependent: OsmBlockObjs,
}
);
impl<'a> Iterator for OsmBlobObjs {
type Item = OsmObj;
fn next(&mut self) -> Option<Self::Item> {
self.with_dependent_mut(|_, objs| objs.next())
}
}
pub struct OsmObjs(OsmObjsImpl);
enum OsmObjsImpl {
OkIter(iter::Map<OsmBlobObjs, fn(OsmObj) -> crate::Result<OsmObj>>),
ErrIter(iter::Once<crate::Result<OsmObj>>),
}
impl Iterator for OsmObjs {
type Item = crate::Result<OsmObj>;
fn next(&mut self) -> Option<Self::Item> {
match self.0 {
OsmObjsImpl::OkIter(ref mut iter) => iter.next(),
OsmObjsImpl::ErrIter(ref mut iter) => iter.next(),
}
}
}
pub fn result_blob_into_iter(result: crate::Result<Blob>) -> OsmObjs {
match result.and_then(|b| crate::reader::primitive_block_from_blob(&b)) {
Ok(block) => OsmObjs(OsmObjsImpl::OkIter(new_rent_osm_objs(block).map(Ok))),
Err(e) => OsmObjs(OsmObjsImpl::ErrIter(iter::once(Err(e)))),
}
}
fn new_rent_osm_objs(block: PrimitiveBlock) -> OsmBlobObjs {
OsmBlobObjs::new(block, |block| blocks::iter(block))
}