1use serde::{Serialize, Serializer, Deserialize, Deserializer};
2
3macro_rules! fixed_point_impl {
4 ($name:ident, $int_bits:expr, $frac_bits:expr, $epsilons_type:ty, $value_type:ty) => {
5 #[derive(PartialEq, Eq, Debug)]
6 pub struct $name {
7 epsilons: $epsilons_type,
8 }
9
10 impl $name {
11 pub fn from_epsilons(epsilons: $epsilons_type) -> $name {
12 $name {epsilons: epsilons}
13 }
14
15 pub fn from_value(value: $value_type) -> $name {
16 let epsilons: $epsilons_type = (value * ((1 << $frac_bits) as $value_type)) as $epsilons_type;
18 $name {epsilons: epsilons}
19 }
20 }
21
22 impl Serialize for $name {
23 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
24 self.epsilons.serialize(serializer)
25 }
26 }
27
28 impl<'a> Deserialize<'a> for $name {
29 fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'a> {
30 Ok($name::from_epsilons(<$epsilons_type>::deserialize(deserializer)?))
31 }
32 }
33 }
34}
35
36fixed_point_impl!(Sfixed8P8, 8, 8, i16, f32);
37fixed_point_impl!(Sfixed16P16, 16, 16, i32, f64);
38fixed_point_impl!(Ufixed8P8, 8, 8, u16, f32);
39fixed_point_impl!(Ufixed16P16, 16, 16, u32, f64);
40
41#[cfg(test)]
42mod tests {
43 use super::Sfixed16P16;
44 use super::Ufixed8P8;
45 use serde_json;
46
47 #[test]
48 fn test_eq() {
49 assert_eq!(Sfixed16P16::from_epsilons(3), Sfixed16P16::from_epsilons(3));
50 }
51
52 #[test]
53 fn test_json_serde_serialization() {
54 assert_eq!(serde_json::to_string(&Sfixed16P16::from_epsilons(3)).unwrap(), "3");
55 }
56
57 #[test]
58 fn test_json_serde_deserialization() {
59 assert_eq!(serde_json::from_str::<Sfixed16P16>("0").unwrap(), Sfixed16P16::from_epsilons(0));
60 assert_eq!(serde_json::from_str::<Sfixed16P16>("3").unwrap(), Sfixed16P16::from_epsilons(3));
61 assert_eq!(serde_json::from_str::<Sfixed16P16>("65536").unwrap(), Sfixed16P16::from_epsilons(65536));
62 assert_eq!(serde_json::from_str::<Sfixed16P16>("2147483647").unwrap(), Sfixed16P16::from_epsilons(2147483647));
63 assert_eq!(serde_json::from_str::<Sfixed16P16>("-2147483648").unwrap(), Sfixed16P16::from_epsilons(-2147483648));
64 }
65
66 #[test]
67 fn test_ufixed8p8() {
68 assert_eq!(serde_json::from_str::<Ufixed8P8>("6144").unwrap(), Ufixed8P8::from_value(24f32));
69 }
70}