smart_keymap/
tuples.rs

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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
use core::fmt::Debug;
use core::ops::{Index, IndexMut};

use crate::key;

/// A tuple struct for 1 key.
#[derive(Debug)]
pub struct Keys1<
    K0: key::Key<Context = Ctx, Event = Ev, PressedKey = PK>,
    Ctx,
    Ev,
    PK,
    const M: usize = { crate::key::MAX_KEY_EVENTS },
>(K0);

impl<
        K0: key::Key<Context = Ctx, Event = Ev, PressedKey = PK> + Copy,
        Ctx,
        Ev,
        PK,
        const M: usize,
    > Keys1<K0, Ctx, Ev, PK, M>
{
    /// Constructs a KeysN for the given tuple.
    pub const fn new((k0,): (K0,)) -> Self {
        Keys1(k0)
    }
}

impl<
        K0: key::Key<Context = Ctx, Event = Ev, PressedKey = PK> + 'static,
        Ctx,
        Ev,
        PK,
        const M: usize,
    > Index<usize> for Keys1<K0, Ctx, Ev, PK, M>
{
    type Output = dyn key::Key<Context = Ctx, Event = Ev, PressedKey = PK>;

    fn index(&self, idx: usize) -> &Self::Output {
        match idx {
            0 => &self.0,
            _ => panic!("Index out of bounds"),
        }
    }
}

impl<
        K0: key::Key<Context = Ctx, Event = Ev, PressedKey = PK> + 'static,
        Ctx,
        Ev,
        PK,
        const M: usize,
    > IndexMut<usize> for Keys1<K0, Ctx, Ev, PK, M>
{
    fn index_mut(&mut self, idx: usize) -> &mut Self::Output {
        match idx {
            0 => &mut self.0,
            _ => panic!("Index out of bounds"),
        }
    }
}

// Use seq_macro's seq! to generate Keys2, Keys3, etc.

macro_rules! define_keys {
    ($n:expr) => {
        paste::paste! {
            seq_macro::seq!(I in 0..$n {
                /// A tuple struct for some number of keys.
                #[derive(core::fmt::Debug)]
                pub struct [<Keys $n>]<
                    #(
                        K~I: crate::key::Key<Context = Ctx, Event = Ev, PressedKey = PK>,
                    )*
                Ctx,
                Ev,
                PK,
                const M: usize = { crate::key::MAX_KEY_EVENTS },
                >(
                    #(
                        K~I,
                    )*
                );

                impl<
                    #(
                        K~I: crate::key::Key<Context = Ctx, Event = Ev, PressedKey = PK> + Copy,
                    )*
                Ctx,
                Ev,
                PK,
                const M: usize,
                > [<Keys $n>]<
                    #(K~I,)*
                Ctx, Ev, PK, M
                    >
                {
                    /// Constructs a KeysN tuple struct with the given tuple.
                    pub const fn new((
                        #(k~I,)*
                    ): (
                        #(K~I,)*
                    )) -> Self {
                        [<Keys $n>](
                            #(
                                (k~I),
                            )*
                        )
                    }
                }

                impl<
                    #(
                        K~I: crate::key::Key<Context = Ctx, Event = Ev, PressedKey = PK> + 'static,
                    )*
                Ctx,
                Ev,
                PK,
                const M: usize,
                > core::ops::Index<usize> for [<Keys $n>]<
                    #(K~I,)*
                Ctx, Ev, PK, M
                    >
                {
                    type Output = dyn crate::key::Key<Context = Ctx, Event = Ev, PressedKey = PK>;

                    fn index(&self, idx: usize) -> &Self::Output {
                        match idx {
                            #(
                                I => &self.I,
                            )*
                            _ => panic!("Index out of bounds"),
                        }
                    }
                }

                impl<
                    #(
                        K~I: crate::key::Key<Context = Ctx, Event = Ev, PressedKey = PK> + 'static,
                    )*
                Ctx,
                Ev,
                PK,
                const M: usize,
                > core::ops::IndexMut<usize> for [<Keys $n>]<
                    #(K~I,)*
                Ctx, Ev, PK, M
                    >
                {
                    fn index_mut(&mut self, idx: usize) -> &mut Self::Output {
                        match idx {
                            #(
                                I => &mut self.I,
                            )*
                            _ => panic!("Index out of bounds"),
                        }
                    }
                }
            });
        }
    };
}

pub(crate) use define_keys;

define_keys!(2);

define_keys!(4);