konst_macro_rules 0.2.19

Implementation detail of the konst crate
Documentation 
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

#[doc(hidden)]
#[repr(C)]
pub union Dereference<'a, T: ?Sized> {
    pub ptr: *const T,
    pub reff: &'a T,
}

#[cfg(feature = "mut_refs")]
mod mut_refs {
    use core::mem::ManuallyDrop;

    #[doc(hidden)]
    #[repr(C)]
    pub(crate) union BorrowMut<'a, T: ?Sized> {
        ptr: *mut T,
        reff: ManuallyDrop<&'a mut T>,
    }

    pub(crate) const unsafe fn deref_raw_mut_ptr<'a, T: ?Sized>(ptr: *mut T) -> &'a mut T {
        ManuallyDrop::into_inner(BorrowMut { ptr }.reff)
    }
}

#[track_caller]
pub const fn panic(msg: &str) -> ! {
    #[cfg(feature = "rust_1_57")]
    {
        panic!("{}", msg)
    }
    #[cfg(not(feature = "rust_1_57"))]
    #[allow(unconditional_panic)]
    {
        [][0]
    }
}

macro_rules! make_parse_closure_macro {
    ($_:tt $macro_name:ident $arg_count:tt ($($pat_var:ident)*)) => {
        #[doc(hidden)]
        #[macro_export]
        macro_rules! $macro_name {
            (
                $macro:tt $args:tt $usage_site:tt,
                |$_($pat_var_:pat),* $_(,)?|  $_(,)?
            ) => {
                $crate::__parse_closure_no_expr_error!{$usage_site}
            };
            (
                ($_($macro:tt)*) ($_($args:tt)*)
                $usage_site:tt,
                |$($_$pat_var:pat),* $_(,)?| $v:expr $_(,)*
            ) => {
                $_($macro)* ! {
                    $_($args)*
                    |$($_$pat_var),*| $v
                }
            };
            (
                $macro:tt $args:tt $usage_site:tt,
                |$_($pat_var_:pat),* $_(,)?| $v:expr,
                $trailing_expr:expr $_(, $_($rem:tt)*)?
            ) => {
                $crate::__parse_closure_trailing_expr_error!{$usage_site}
            };
            ($macro:tt $args:tt $usage_site:tt, | $_($anything:tt)* ) => {
                $crate::__parse_closure_emit_error!{
                    $arg_count
                    $usage_site
                }
            };
            ($macro:tt $args:tt $usage_site:tt, || $_($anything:tt)* ) => {
                $crate::__parse_closure_emit_error!{
                    $arg_count
                    $usage_site
                }
            };
            (
                ($_($macro:tt)*) ($_($args:tt)*)
                $usage_site:tt, $v:expr $_(,)?
            ) => {
                match $v {func => {
                    $_($macro)* ! {
                        $_($args)*
                        |$($pat_var),*| func($($pat_var),*)
                    }
                }}
            };
            ($macro:tt $args:tt $usage_site:tt $_($rem:tt)*) => {
                $crate::__parse_closure_emit_error!{
                    $arg_count
                    $usage_site
                }
            };

            ( $_($anything:tt)* ) => {
                $crate::__::compile_error!("expected a closure argument")
            };
        }

        pub use $macro_name;
    }
}

make_parse_closure_macro! { $ __parse_closure_1 1 (aaa) }
make_parse_closure_macro! { $ __parse_closure_2 2 (aaa bbb) }

#[doc(hidden)]
#[macro_export]
macro_rules! __parse_closure_no_expr_error {
    (($($usage_site:tt)*)) => {
        $crate::__::compile_error!{$crate::__::concat!(
            "`",
            $crate::__::stringify!($($usage_site)*),
            "` expects valid closure syntax, passed closure without return value",
        )}
    };
}

#[doc(hidden)]
#[macro_export]
macro_rules! __parse_closure_trailing_expr_error {
    (($($usage_site:tt)*)) => {
        $crate::__::compile_error!{$crate::__::concat!(
            "`",
            $crate::__::stringify!($($usage_site)*),
            "` expects no arguments after closure argument",
        )}
    };
}

#[doc(hidden)]
#[macro_export]
macro_rules! __parse_closure_emit_error {
    ($count:tt ($($usage_site:tt)*)) => {
        $crate::__::compile_error!{$crate::__::concat!(
            "`",
            $crate::__::stringify!($($usage_site)*),
            "` expects to be passed a ",
            $count,
            "-parameter closure",
        )}
    };
}

#[cfg(feature = "mut_refs")]
pub(crate) use mut_refs::{deref_raw_mut_ptr, BorrowMut};