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

use std::ffi::{CStr, CString};
use std::ops::RangeInclusive;

use crate::connection::Connection;
use crate::protocol::wl_registry::GlobalArgs;
use crate::proxy::Proxy;

pub type Global = GlobalArgs;
pub type Globals = [Global];

pub trait GlobalExt {
    fn is<P: Proxy>(&self) -> bool;

    fn bind<P: Proxy, D>(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
    ) -> Result<P, BindError>;

    fn bind_with_cb<
        P: Proxy,
        D,
        F: FnMut(&mut Connection<D>, &mut D, P, P::Event) + Send + 'static,
    >(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
        cb: F,
    ) -> Result<P, BindError>;
}

pub trait GlobalsExt {
    fn bind<P: Proxy, D>(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
    ) -> Result<P, BindError>;

    fn bind_with_cb<
        P: Proxy,
        D,
        F: FnMut(&mut Connection<D>, &mut D, P, P::Event) + Send + 'static,
    >(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
        cb: F,
    ) -> Result<P, BindError>;
}

impl GlobalExt for Global {
    fn is<P: Proxy>(&self) -> bool {
        P::interface().name == self.interface.as_c_str()
    }

    fn bind<P: Proxy, D>(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
    ) -> Result<P, BindError> {
        if !self.is::<P>() {
            return Err(BindError::IncorrectInterface {
                actual: self.interface.to_owned(),
                requested: P::interface().name,
            });
        }

        assert!(*version.end() <= P::interface().version);

        if self.version < *version.start() {
            return Err(BindError::UnsupportedVersion {
                actual: self.version,
                min: *version.start(),
                max: *version.end(),
            });
        }

        let reg = conn.registry();
        let version = u32::min(*version.end(), self.version);

        Ok(reg.bind(conn, self.name, version))
    }

    fn bind_with_cb<
        P: Proxy,
        D,
        F: FnMut(&mut Connection<D>, &mut D, P, P::Event) + Send + 'static,
    >(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
        cb: F,
    ) -> Result<P, BindError> {
        if !self.is::<P>() {
            return Err(BindError::IncorrectInterface {
                actual: self.interface.to_owned(),
                requested: P::interface().name,
            });
        }

        assert!(*version.end() <= P::interface().version);

        if self.version < *version.start() {
            return Err(BindError::UnsupportedVersion {
                actual: self.version,
                min: *version.start(),
                max: *version.end(),
            });
        }

        let reg = conn.registry();
        let version = u32::min(*version.end(), self.version);

        Ok(reg.bind_with_cb(conn, self.name, version, cb))
    }
}

impl GlobalsExt for Globals {
    fn bind<P: Proxy, D>(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
    ) -> Result<P, BindError> {
        let global = self
            .iter()
            .find(|g| g.is::<P>())
            .ok_or(BindError::GlobalNotFound(P::interface().name))?;
        global.bind(conn, version)
    }

    fn bind_with_cb<
        P: Proxy,
        D,
        F: FnMut(&mut Connection<D>, &mut D, P, P::Event) + Send + 'static,
    >(
        &self,
        conn: &mut Connection<D>,
        version: RangeInclusive<u32>,
        cb: F,
    ) -> Result<P, BindError> {
        let global = self
            .iter()
            .find(|g| g.is::<P>())
            .ok_or(BindError::GlobalNotFound(P::interface().name))?;
        global.bind_with_cb(conn, version, cb)
    }
}

#[derive(Debug, thiserror::Error)]
pub enum BindError {
    #[error("global has interface {actual:?} but {requested:?} was requested")]
    IncorrectInterface {
        actual: CString,
        requested: &'static CStr,
    },
    #[error("global has version {actual} but version in range [{min}, {max}] was requested")]
    UnsupportedVersion { actual: u32, min: u32, max: u32 },
    #[error("global with interface {0:?} not found")]
    GlobalNotFound(&'static CStr),
}