treaty -


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109

use crate::{
    build::Builder,
    effect::{Effect, Future},
    hkt::Marker,
    Walk, Walker, WalkerTypes,
};

#[inline]
#[allow(clippy::type_complexity)]
pub fn transform<'a, 'ctx, B: Builder<'ctx, E> + 'a, W: Walker<'ctx, E> + 'a, E: Effect>(
    seed: B::Seed,
    walker: W,
) -> Future<'a, (Result<B::Value, B::Error>, Result<W::Output, W::Error>), E> {
    E::wrap(async {
        // Create builder from seed value;
        let mut builder = B::from_seed(seed).await;

        // Walk the walker with the builder as the visitor.
        let walker_result = walker.walk(builder.as_visitor()).await;

        // Finish building the value.
        let builder_result = builder.build().await;

        (builder_result, walker_result)
    })
}

/// For use in a lens.
pub struct Projection<T, B, U, M> {
    value: T,
    builder: B,
    _marker: Marker<(U, M)>,
}

// #[allow(clippy::type_complexity)]
// impl<T, B, U: Send + Sync, M> Projection<T, B, U, M> {
//     pub fn project_ref<'a, E: Effect>(
//         &'a self,
//     ) -> Future<
//         'a,
//         (
//             Result<&'a U, B::Error>,
//             Result<<<&'a T as Walk<'>>::Walker as WalkerTypes>::Output, <&'a T as WalkerTypes>::Error>,
//         ),
//         E,
//     >
//     where
//         &'a T: Walk<'a, M, E>,
//         B: Clone + Builder<'a, E, Value = &'a U>,
//     {
//         let walker = self.value.into_walker();
//         let mut builder = self.builder.clone();
//
//         E::wrap(async {
//             let result = walker.walk(builder.as_visitor()).await;
//
//             (builder.build().await, result)
//         })
//     }
//
//     pub fn project_mut<'a, E: Effect>(
//         &'a mut self,
//     ) -> Future<
//         'a,
//         (
//             Result<&'a mut U, B::Error>,
//             Result<<&'a mut T as WalkerTypes>::Output, <&'a mut T as WalkerTypes>::Error>,
//         ),
//         E,
//     >
//     where
//         &'a mut T: Walk<'a, M, E>,
//         B: Clone + Builder<'a, E, Value = &'a mut U>,
//     {
//         let walker = self.value.into_walker();
//         let mut builder = self.builder.clone();
//
//         E::wrap(async {
//             let result = walker.walk(builder.as_visitor()).await;
//
//             (builder.build().await, result)
//         })
//     }
//
//     pub fn project<'a, E: Effect>(
//         self,
//     ) -> Future<
//         'a,
//         (
//             Result<U, B::Error>,
//             Result<<T as WalkerTypes>::Output, <T as WalkerTypes>::Error>,
//         ),
//         E,
//     >
//     where
//         T: Walk<'a, M, E> + 'a,
//         M: 'a,
//         B: Clone + Builder<'a, E, Value = U> + 'a,
//     {
//         let walker = self.value.into_walker();
//         let mut builder = self.builder.clone();
//
//         E::wrap(async {
//             let result = walker.walk(builder.as_visitor()).await;
//
//             (builder.build().await, result)
//         })
//     }
// }