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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

use std::{future::Future, marker::PhantomData, pin::Pin, thread::yield_now, time::Duration};

use treaty::{
    any::{any_trait, static_wrapper::OwnedStatic, AnyTrait, IndirectLtAny, LtTypeId},
    build_with, into_walker,
    protocol::{
        visitor::Value, AnyTraitSendObj, AsyncEffect, ControlFlowFor, Effect, SyncEffect, Visitor, any_t, any_trait_send_obj,
    },
    Build, Builder, Walker,
};

#[test]
fn demo() {
    let hook = Hook {
        inner: into_walker(true),
        _marker: PhantomData,
    };
    let x = build_with::<<bool as Build<_>>::Builder, _>(hook).unwrap();
    dbg!(x);
    todo!();
}

struct Hook<T, Effect> {
    inner: T,
    _marker: PhantomData<fn() -> Effect>,
}

struct VisitorHook<'a, 'ctx: 'a, E: Effect<'ctx>> {
    inner: any_trait_send_obj::T<'a, 'ctx, E::VisitorHkt>,
}

impl<'ctx, T: Walker<'ctx, Effect = AsyncEffect> + Send> Walker<'ctx> for Hook<T, AsyncEffect>
where
    <T as Walker<'ctx>>::Error: Send,
    <T as Walker<'ctx>>::Output: Send,
{
    type Effect = T::Effect;

    type Error = T::Error;

    type Output = T::Output;

    fn walk<'a>(
        self,
        visitor: Visitor<'a, 'ctx, T::Effect>,
    ) -> ControlFlowFor<'a, 'ctx, Self::Effect, Self::Output, Self::Error>
    where
        Self: 'a,
        'ctx: 'a
    {
        Box::pin(async move {
            let mut visitor = VisitorHook::<Self::Effect> {
                inner: visitor,
            };

            let flow = self.inner.walk(&mut visitor);

            flow.await
        })
    }
}

impl<'ctx, T: Walker<'ctx, Effect = SyncEffect>> Walker<'ctx> for Hook<T, SyncEffect> {
    type Effect = T::Effect;

    type Error = T::Error;

    type Output = T::Output;

    fn walk<'a>(
        self,
        visitor: Visitor<'a, 'ctx, T::Effect>,
    ) -> ControlFlowFor<'a, 'ctx, Self::Effect, Self::Output, Self::Error>
    where
        Self: 'a,
        'ctx: 'a,
    {
        let mut visitor = VisitorHook::<Self::Effect> { inner: visitor };
        let flow = self.inner.walk(&mut visitor);
        flow
    }
}

impl<'b, 'ctx: 'b, E: Effect<'ctx>> AnyTrait<'ctx> for VisitorHook<'b, 'ctx, E> {
    fn upcast_to_id<'a>(
        &'a self,
        id: treaty::any::LtTypeId<'ctx>,
    ) -> Option<treaty::any::IndirectLtAny<'a, 'ctx, treaty::any::Ref>>
    where
        'ctx: 'a,
    {
        match id {
            id => self.inner.as_obj().upcast_to_id(id),
        }
    }

    fn upcast_to_id_mut<'a>(
        &'a mut self,
        id: treaty::any::LtTypeId<'ctx>,
    ) -> Option<treaty::any::IndirectLtAny<'a, 'ctx, treaty::any::Mut>>
    where
        'ctx: 'a,
    {
        match id {
            id if id == LtTypeId::of::<dyn Value<'ctx, OwnedStatic<bool>, E> + 'a>() => {
                if self.inner.as_obj_mut().upcast_to_id_mut(id).is_some() {
                    Some(IndirectLtAny::<'a, 'ctx, _>::new::<
                        dyn Value<'ctx, OwnedStatic<bool>, E> + 'a,
                    >(self as _))
                } else {
                    None
                }
            }
            id => self.inner.as_obj_mut().upcast_to_id_mut(id),
        }
    }
}

impl<'b, 'ctx: 'b, E: Effect<'ctx>> Value<'ctx, OwnedStatic<bool>, E> for VisitorHook<'b, 'ctx, E> {
    #[inline]
    fn visit<'a>(&'a mut self, OwnedStatic(value): OwnedStatic<bool>) -> ControlFlowFor<'a, 'ctx, E> where 'ctx: 'a {
        let visitor = self
            .inner
            .as_obj_mut()
            .upcast_mut::<dyn Value<'ctx, OwnedStatic<bool>, E> + 'a>()
            .unwrap();

        println!("Hooked bool: {}", value);
        visitor.visit(OwnedStatic(!value))
    }
}