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

/**
Gets a reference to a `Class`.

Panics if no class with the given name can be found.
To check for a class that may not exist, use `Class::get`.

# Example
``` no_run
# #[macro_use] extern crate objc;
# fn main() {
let cls = class!(NSObject);
# }
```
*/
#[macro_export]
macro_rules! class {
    ($name:ident) => ({
        #[allow(deprecated)]
        #[inline(always)]
        fn get_class(name: &str) -> Option<&'static $crate::runtime::Class> {
            unsafe {
                #[cfg_attr(feature = "cargo-clippy", allow(replace_consts))]
                static CLASS: ::std::sync::atomic::AtomicUsize = ::std::sync::atomic::ATOMIC_USIZE_INIT;
                // `Relaxed` should be fine since `objc_getClass` is thread-safe.
                let ptr = CLASS.load(::std::sync::atomic::Ordering::Relaxed) as *const $crate::runtime::Class;
                if ptr.is_null() {
                    let cls = $crate::runtime::objc_getClass(name.as_ptr() as *const _);
                    CLASS.store(cls as usize, ::std::sync::atomic::Ordering::Relaxed);
                    if cls.is_null() { None } else { Some(&*cls) }
                } else {
                    Some(&*ptr)
                }
            }
        }
        match get_class(concat!(stringify!($name), '\0')) {
            Some(cls) => cls,
            None => panic!("Class with name {} could not be found", stringify!($name)),
        }
    })
}

#[doc(hidden)]
#[macro_export]
macro_rules! sel_impl {
    // Declare a function to hide unsafety, otherwise we can trigger the
    // unused_unsafe lint; see rust-lang/rust#8472
    ($name:expr) => ({
        #[allow(deprecated)]
        #[inline(always)]
        fn register_sel(name: &str) -> $crate::runtime::Sel {
            unsafe {
                #[cfg_attr(feature = "cargo-clippy", allow(replace_consts))]
                static SEL: ::std::sync::atomic::AtomicUsize = ::std::sync::atomic::ATOMIC_USIZE_INIT;
                let ptr = SEL.load(::std::sync::atomic::Ordering::Relaxed) as *const ::std::os::raw::c_void;
                // It should be fine to use `Relaxed` ordering here because `sel_registerName` is
                // thread-safe.
                if ptr.is_null() {
                    let sel = $crate::runtime::sel_registerName(name.as_ptr() as *const _);
                    SEL.store(sel.as_ptr() as usize, ::std::sync::atomic::Ordering::Relaxed);
                    sel
                } else {
                    $crate::runtime::Sel::from_ptr(ptr)
                }
            }
        }
        register_sel($name)
    })
}

/**
Registers a selector, returning a `Sel`.

# Example
```
# #[macro_use] extern crate objc;
# fn main() {
let sel = sel!(description);
let sel = sel!(setObject:forKey:);
# }
```
*/
#[macro_export]
macro_rules! sel {
    ($name:ident) => ({sel_impl!(concat!(stringify!($name), '\0'))});
    ($($name:ident :)+) => ({sel_impl!(concat!($(stringify!($name), ':'),+, '\0'))});
}

/**
Sends a message to an object.

The first argument can be any type that dereferences to a type that implements
`Message`, like a reference, pointer, or an `Id`.
The syntax is similar to the message syntax in Objective-C.
Variadic arguments are not currently supported.

# Example
``` no_run
# #[macro_use] extern crate objc;
# use objc::runtime::Object;
# fn main() {
# unsafe {
let obj: *mut Object;
# let obj: *mut Object = 0 as *mut Object;
let description: *const Object = msg_send![obj, description];
let _: () = msg_send![obj, setArg1:1 arg2:2];
# }
# }
```
*/
#[macro_export]
macro_rules! msg_send {
    (super($obj:expr, $superclass:expr), $name:ident) => ({
        let sel = sel!($name);
        match $crate::__send_super_message(&*$obj, $superclass, sel, ()) {
            Err(s) => panic!("{}", s),
            Ok(r) => r,
        }
    });
    (super($obj:expr, $superclass:expr), $($name:ident : $arg:expr)+) => ({
        let sel = sel!($($name:)+);
        match $crate::__send_super_message(&*$obj, $superclass, sel, ($($arg,)*)) {
            Err(s) => panic!("{}", s),
            Ok(r) => r,
        }
    });
    ($obj:expr, $name:ident) => ({
        let sel = sel!($name);
        match $crate::__send_message(&*$obj, sel, ()) {
            Err(s) => panic!("{}", s),
            Ok(r) => r,
        }
    });
    ($obj:expr, $($name:ident : $arg:expr)+) => ({
        let sel = sel!($($name:)+);
        match $crate::__send_message(&*$obj, sel, ($($arg,)*)) {
            Err(s) => panic!("{}", s),
            Ok(r) => r,
        }
    });
}