list_fn/
scan.rs

1use super::*;
2
3pub struct ScanState<S: ScanFn> {
4    pub first: S::OutputItem,
5    pub next: S,
6}
7
8pub trait ScanFn: Sized {
9    type InputItem;
10    type InputResult;
11    type OutputItem;
12    type OutputResult;
13    fn map_input(self, input: Self::InputItem) -> ScanState<Self>;
14    fn map_result(self, result: Self::InputResult) -> Self::OutputResult;
15}
16
17pub struct ScanWrap<S: ScanFn>(S);
18
19impl<S: ScanFn> FlatScanFn for ScanWrap<S> {
20    type InputItem = S::InputItem;
21    type InputResult = S::InputResult;
22    type OutputList = OptionList<S::OutputItem, Self>;
23    type EndList = OptionList<S::OutputItem, Id<S::OutputResult>>;
24    fn map_item(self, input: Self::InputItem) -> Self::OutputList {
25        let ScanState { first, next } = self.0.map_input(input);
26        OptionList::Some {
27            first,
28            end: ScanWrap(next),
29        }
30    }
31    fn map_result(self, result: Self::InputResult) -> Self::EndList {
32        OptionList::End(Id::new(self.0.map_result(result)))
33    }
34}
35
36pub trait Scan
37where
38    Self: ListFn,
39    Self::End: ResultFn,
40{
41    fn scan<S: ScanFn<InputItem = Self::Item, InputResult = <Self::End as ResultFn>::Result>>(
42        self,
43        scan: S,
44    ) -> FlatScanState<Self, ScanWrap<S>> {
45        self.flat_scan(ScanWrap(scan))
46    }
47}
48
49impl<L> Scan for L
50where
51    Self: ListFn,
52    Self::End: ResultFn,
53{
54}
list_fn/scan.rs

list_fn/
scan.rs
