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

#![cfg(feature = "serde")]
#![doc = include_str!("../doc/serdes.md")]

mod array;
mod slice;
mod utils;

use core::fmt::{
	self,
	Formatter,
};

use serde::de::{
	Deserialize,
	Deserializer,
	Visitor,
};

/// A result of serialization.
type Result<S> = core::result::Result<
	<S as serde::Serializer>::Ok,
	<S as serde::Serializer>::Error,
>;

/// A list of fields in the `BitSeq` and `BitArr` transport format.
static FIELDS: &[&str] = &["order", "head", "bits", "data"];

/// The components of a bit-slice in wire format.
enum Field {
	/// Denotes the `<O: BitOrder>` type parameter.
	Order,
	/// Denotes the head-bit index in the first `Data` element.
	Head,
	/// Denotes the count of all live bits in the `Data` sequence.
	Bits,
	/// Denotes the raw storage sequence.
	Data,
}

/// Visits field tokens without attempting to deserialize into real data.
struct FieldVisitor;

impl<'de> Deserialize<'de> for Field {
	fn deserialize<D>(deserializer: D) -> core::result::Result<Self, D::Error>
	where D: Deserializer<'de> {
		deserializer.deserialize_identifier(FieldVisitor)
	}
}

impl<'de> Visitor<'de> for FieldVisitor {
	type Value = Field;

	fn expecting(&self, fmt: &mut Formatter) -> fmt::Result {
		fmt.write_str("field_identifier")
	}

	fn visit_str<E>(self, value: &str) -> core::result::Result<Self::Value, E>
	where E: serde::de::Error {
		match value {
			"order" => Ok(Field::Order),
			"head" => Ok(Field::Head),
			"bits" => Ok(Field::Bits),
			"data" => Ok(Field::Data),
			_ => Err(serde::de::Error::unknown_field(value, FIELDS)),
		}
	}
}

#[cfg(test)]
mod tests {
	use serde::{
		Deserialize,
		Serialize,
	};
	use static_assertions::*;

	use crate::prelude::*;

	#[test]
	fn trait_impls() {
		use core::{
			cell::Cell,
			sync::atomic::*,
		};

		use radium::types::*;
		macro_rules! check_impl {
			($($ord:ident @ $($sto:ty),+);+ $(;)?) => {{ $( $(
				assert_impl_all!(BitSlice<$sto, $ord>: Serialize);
				assert_impl_all!(BitArray<$sto, $ord>: Serialize, Deserialize<'static>);
				assert_impl_all!(BitArray<[$sto; 32], $ord>: Serialize, Deserialize<'static>);

				#[cfg(feature = "alloc")] {
					assert_impl_all!(BitBox<$sto, $ord>: Serialize, Deserialize<'static>);
					assert_impl_all!(BitVec<$sto, $ord>: Serialize, Deserialize<'static>);
				}
			)+ )+ }};
		}

		assert_impl_all!(&BitSlice<u8, Lsb0>: Deserialize<'static>);
		assert_impl_all!(&BitSlice<u8, Msb0>: Deserialize<'static>);
		assert_impl_all!(&BitSlice<u8, LocalBits>: Deserialize<'static>);

		check_impl! {
			Lsb0 @ u8, u16, u32, usize;
			Msb0 @ u8, u16, u32, usize;
			LocalBits @ u8, u16, u32, usize;
			Lsb0 @ Cell<u8>, Cell<u16>, Cell<u32>, Cell<usize>;
			Msb0 @ Cell<u8>, Cell<u16>, Cell<u32>, Cell<usize>;
			LocalBits @ Cell<u8>, Cell<u16>, Cell<u32>, Cell<usize>;
			Lsb0 @ RadiumU8, RadiumU16, RadiumU32, RadiumUsize;
			Msb0 @ RadiumU8, RadiumU16, RadiumU32, RadiumUsize;
			LocalBits @ RadiumU8, RadiumU16, RadiumU32, RadiumUsize;
		}
		radium::if_atomic! {
			if atomic(8) {
				check_impl! {
					Lsb0 @ AtomicU8;
					Msb0 @ AtomicU8;
					LocalBits @ AtomicU8;
				}
			}
			if atomic(16) {
				check_impl! {
					Lsb0 @ AtomicU16;
					Msb0 @ AtomicU16;
					LocalBits @ AtomicU16;
				}
			}
			if atomic(32) {
				check_impl! {
					Lsb0 @ AtomicU32;
					Msb0 @ AtomicU32;
					LocalBits @ AtomicU32;
				}
			}
			if atomic(ptr) {
				check_impl! {
					Lsb0 @ AtomicUsize;
					Msb0 @ AtomicUsize;
					LocalBits @ AtomicUsize;
				}
			}
		}
		#[cfg(target_pointer_width = "64")]
		check_impl! {
			Lsb0 @ u64, RadiumU64;
			Msb0 @ u64, RadiumU64;
			LocalBits @ u64, RadiumU64;
		}
		#[cfg(target_pointer_width = "64")]
		radium::if_atomic!(if atomic(64) {
			check_impl! {
				Lsb0 @ AtomicU64;
				Msb0 @ AtomicU64;
				LocalBits @ AtomicU64;
			}
		});
	}
}