wasm_reader_traits/
iter.rs

1use crate::Parser;
2use std::io::Read;
3
4pub struct ParserIter<R, P> {
5    reader: R,
6    parser: P,
7}
8
9impl<R, P> ParserIter<R, P> {
10    pub fn new(reader: R, parser: P) -> Self {
11        ParserIter { reader, parser }
12    }
13}
14
15impl<R, P> Iterator for ParserIter<R, Option<P>>
16where
17    R: Read,
18    P: Parser<Next = Option<P>>,
19{
20    type Item = Result<P::Item, P::Error>;
21
22    fn next(&mut self) -> Option<Self::Item> {
23        let (val, next) = match self.parser.take()?.next(&mut self.reader) {
24            Ok(v) => v,
25            Err(e) => return Some(Err(e)),
26        };
27
28        self.parser = next;
29
30        Some(Ok(val))
31    }
32}
33
34impl<R, P> Iterator for ParserIter<R, &'_ mut Option<P>>
35where
36    R: Read,
37    P: Parser<Next = Option<P>>,
38{
39    type Item = Result<P::Item, P::Error>;
40
41    fn next(&mut self) -> Option<Self::Item> {
42        let (val, next) = match self.parser.take()?.next(&mut self.reader) {
43            Ok(v) => v,
44            Err(e) => return Some(Err(e)),
45        };
46
47        *self.parser = next;
48
49        Some(Ok(val))
50    }
51}
52
53pub trait IntoParserIter: Sized {
54    type Item;
55    type Error;
56
57    fn parse_iter<R: Read>(self, reader: R) -> ParserIter<R, Self>
58    where
59        ParserIter<R, Self>: Iterator<Item = Result<Self::Item, Self::Error>>;
60}
61
62impl<T> IntoParserIter for Option<T>
63where
64    T: Parser<Next = Option<T>>,
65{
66    type Item = T::Item;
67    type Error = T::Error;
68
69    fn parse_iter<R: Read>(self, reader: R) -> ParserIter<R, Self> {
70        ParserIter::new(reader, self)
71    }
72}
73
74impl<T> IntoParserIter for &'_ mut Option<T>
75where
76    T: Parser<Next = Option<T>>,
77{
78    type Item = T::Item;
79    type Error = T::Error;
80
81    fn parse_iter<R: Read>(self, reader: R) -> ParserIter<R, Self> {
82        ParserIter::new(reader, self)
83    }
84}
wasm_reader_traits/iter.rs

wasm_reader_traits/
iter.rs
