serde_json_bytes 0.2.5

a JSON Value object with strings backed by Bytes, parsed by serde_json
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

use serde::de;
use serde_json::Number;
use std::fmt;

pub(crate) const TOKEN: &str = "$serde_json::private::Number";

pub struct NumberFromString {
    pub value: Number,
}

impl<'de> de::Deserialize<'de> for NumberFromString {
    fn deserialize<D>(deserializer: D) -> Result<NumberFromString, D::Error>
    where
        D: de::Deserializer<'de>,
    {
        struct Visitor;

        impl<'de> de::Visitor<'de> for Visitor {
            type Value = NumberFromString;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("string containing a number")
            }

            fn visit_str<E>(self, s: &str) -> Result<NumberFromString, E>
            where
                E: de::Error,
            {
                let n = tri!(s.parse().map_err(de::Error::custom));
                Ok(NumberFromString { value: n })
            }
        }

        deserializer.deserialize_str(Visitor)
    }
}