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
use crate::Action;
use std::fmt::{self, Display, Formatter};
#[derive(Clone, Debug)]
pub struct Join<A, B> {
a: A,
b: B,
}
impl<A, B> Join<A, B> {
pub const fn new(a: A, b: B) -> Self {
Join { a, b }
}
pub const fn join<C>(self, c: C) -> Join<Self, C> {
Join::new(self, c)
}
}
impl<A, B> Action for Join<A, B>
where
A: Action,
B: Action<Target = A::Target>,
{
type Target = A::Target;
type Output = ();
fn apply(&mut self, target: &mut A::Target) -> Self::Output {
self.a.apply(target);
self.b.apply(target);
}
fn undo(&mut self, target: &mut A::Target) -> Self::Output {
self.b.undo(target);
self.a.undo(target);
}
fn redo(&mut self, target: &mut A::Target) -> Self::Output {
self.a.redo(target);
self.b.redo(target);
}
}
impl<A, B> Display for Join<A, B>
where
A: Display,
B: Display,
{
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{} & {}", self.a, self.b)
}
}
#[derive(Clone, Debug)]
pub struct TryJoin<A, B> {
a: A,
b: B,
}
impl<A, B> TryJoin<A, B> {
pub const fn new(a: A, b: B) -> Self {
TryJoin { a, b }
}
pub const fn join<C>(self, c: C) -> TryJoin<Self, C> {
TryJoin::new(self, c)
}
}
impl<A, B, E> Action for TryJoin<A, B>
where
A: Action<Output = Result<(), E>>,
B: Action<Target = A::Target, Output = A::Output>,
{
type Target = A::Target;
type Output = A::Output;
fn apply(&mut self, target: &mut A::Target) -> Self::Output {
self.a.apply(target)?;
self.b.apply(target)
}
fn undo(&mut self, target: &mut A::Target) -> Self::Output {
self.b.undo(target)?;
self.a.undo(target)
}
fn redo(&mut self, target: &mut A::Target) -> Self::Output {
self.a.redo(target)?;
self.b.redo(target)
}
}
impl<A, B> Display for TryJoin<A, B>
where
A: Display,
B: Display,
{
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{} & {}", self.a, self.b)
}
}