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

use serde_json::{Number, Value};

use crate::types::{DataType, ParseError, ParseResult, Type};

macro_rules! impl_type_for_floats {
    ($(($ty:ty, $format:literal)),*) => {
        $(
        impl Type for $ty {
            const DATA_TYPE: DataType = DataType::new("number");

            fn parse(value: Option<Value>) -> ParseResult<Self> {
                if let Some(Value::Number(n)) = value {
                    let n = n
                        .as_f64()
                        .ok_or_else(|| ParseError::from("invalid number"))?;
                    Ok(n as Self)
                } else {
                    Err(ParseError::expected_type(value.unwrap_or_default()))
                }
            }

            fn parse_from_str(value: Option<&str>) -> ParseResult<Self> {
                match value {
                    Some(value) => value.parse().map_err(|err| ParseError::custom(err)),
                    None => Err(ParseError::expected_input()),
                }
            }

            fn to_value(&self) -> Value {
                Value::Number(Number::from_f64(*self as f64).unwrap())
            }
        }

        )*
    };
}

impl_type_for_floats!((f32, "float32"), (f64, "float64"));