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

use std::{cmp, fmt, str::FromStr};

pub struct StringWrapped<T>(pub T);

impl<T> From<T> for StringWrapped<T> {
    fn from(v: T) -> Self {
        StringWrapped(v)
    }
}

impl<T> AsRef<T> for StringWrapped<T> {
    fn as_ref(&self) -> &T {
        &self.0
    }
}

impl<T> std::ops::Deref for StringWrapped<T> {
    type Target = T;

    fn deref(&self) -> &T {
        &self.0
    }
}

impl<T> fmt::Debug for StringWrapped<T>
where
    T: fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "StringWrapped({:?})", self.0)
    }
}

impl<T> fmt::Display for StringWrapped<T>
where
    T: fmt::Display,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "StringWrapped({})", self.0)
    }
}

impl<T> Clone for StringWrapped<T>
where
    T: Clone,
{
    fn clone(&self) -> Self {
        StringWrapped(self.0.clone())
    }
}

impl<T> Copy for StringWrapped<T> where T: Copy {}

// impl<T, Rhs> cmp::PartialEq<Rhs> for StringWrapped<T>
// where
//     T: cmp::PartialEq<Rhs>,
// {
//     fn eq(&self, other: &Rhs) -> bool {
//         &self.0 == other
//     }
// }

impl<T> cmp::PartialEq for StringWrapped<T>
where
    T: cmp::PartialEq,
{
    fn eq(&self, other: &Self) -> bool {
        self.0 == other.0
    }
}

impl<T> cmp::Eq for StringWrapped<T> where T: cmp::Eq {}

impl<T> PartialOrd for StringWrapped<T>
where
    T: PartialOrd,
{
    fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
        self.0.partial_cmp(&other.0)
    }
}

impl<T> cmp::Ord for StringWrapped<T>
where
    T: cmp::Ord,
{
    fn cmp(&self, other: &Self) -> cmp::Ordering {
        self.0.cmp(other)
    }
}

impl<'de, T> serde::Deserialize<'de> for StringWrapped<T>
where
    T: FromStr,
    <T as FromStr>::Err: fmt::Display,
{
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::de::Deserializer<'de>,
    {
        deserializer
            .deserialize_str(Visitor {
                _marker: std::marker::PhantomData::<T>,
            })
            .map(StringWrapped)
    }
}

struct Visitor<T>
where
    T: FromStr,
    T::Err: fmt::Display,
{
    _marker: std::marker::PhantomData<T>,
}

impl<'de, T> serde::de::Visitor<'de> for Visitor<T>
where
    T: FromStr,
    <T as FromStr>::Err: fmt::Display,
{
    type Value = T;

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        formatter.write_str("a string that can be parsed as the given type")
    }

    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        T::from_str(value).map_err(serde::de::Error::custom)
    }
}

#[cfg(test)]
mod tests {

    use super::*;

    #[test]
    fn test_compare() {
        StringWrapped(23) == StringWrapped(23);
    }

    #[test]
    fn test_ord() {
        StringWrapped(23) < StringWrapped(23);
    }

    #[test]
    fn deserialize_number() {
        assert_eq!(
            StringWrapped(23),
            serde_json::from_str::<StringWrapped<i32>>(r#""23""#).expect("Deserializing")
        );
    }
}