rune_alloc/string/
serde.rs

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
161
162
163
use core::fmt;

use serde::de::{self, Error, Unexpected};
use serde::ser;

use crate::borrow::{Cow, TryToOwned};
use crate::{Box, String, Vec};

impl ser::Serialize for String {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: ser::Serializer,
    {
        serializer.serialize_str(self.as_str())
    }
}

impl<'de> de::Deserialize<'de> for String {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: de::Deserializer<'de>,
    {
        deserializer.deserialize_string(StringVisitor)
    }

    fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
    where
        D: de::Deserializer<'de>,
    {
        deserializer.deserialize_string(StringInPlaceVisitor(place))
    }
}

impl<'de> de::Deserialize<'de> for Box<str> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: de::Deserializer<'de>,
    {
        let string = String::deserialize(deserializer)?;
        string.try_into_boxed_str().map_err(D::Error::custom)
    }
}

impl<'de, 'a, T: ?Sized> de::Deserialize<'de> for Cow<'a, T>
where
    T: TryToOwned,
    T::Owned: de::Deserialize<'de>,
{
    #[inline]
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: de::Deserializer<'de>,
    {
        T::Owned::deserialize(deserializer).map(Cow::Owned)
    }
}

struct StringVisitor;
struct StringInPlaceVisitor<'a>(&'a mut String);

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

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

    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
    where
        E: Error,
    {
        v.try_to_owned().map_err(E::custom)
    }

    fn visit_string<E>(self, v: ::rust_alloc::string::String) -> Result<Self::Value, E>
    where
        E: Error,
    {
        String::try_from(v).map_err(E::custom)
    }

    fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
    where
        E: Error,
    {
        match core::str::from_utf8(v) {
            Ok(s) => s.try_to_owned().map_err(E::custom),
            Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
        }
    }

    fn visit_byte_buf<E>(self, v: ::rust_alloc::vec::Vec<u8>) -> Result<Self::Value, E>
    where
        E: Error,
    {
        let v = Vec::try_from(v).map_err(E::custom)?;

        match String::from_utf8(v) {
            Ok(s) => Ok(s),
            Err(e) => Err(Error::invalid_value(
                Unexpected::Bytes(&e.into_bytes()),
                &self,
            )),
        }
    }
}

impl<'a, 'de> de::Visitor<'de> for StringInPlaceVisitor<'a> {
    type Value = ();

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

    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
    where
        E: Error,
    {
        self.0.clear();
        self.0.try_push_str(v).map_err(E::custom)?;
        Ok(())
    }

    fn visit_string<E>(self, v: ::rust_alloc::string::String) -> Result<Self::Value, E>
    where
        E: Error,
    {
        *self.0 = String::try_from(v.as_str()).map_err(E::custom)?;
        Ok(())
    }

    fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
    where
        E: Error,
    {
        match core::str::from_utf8(v) {
            Ok(s) => {
                self.0.clear();
                self.0.try_push_str(s).map_err(E::custom)?;
                Ok(())
            }
            Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
        }
    }

    fn visit_byte_buf<E>(self, v: ::rust_alloc::vec::Vec<u8>) -> Result<Self::Value, E>
    where
        E: Error,
    {
        let v = Vec::try_from(v).map_err(E::custom)?;

        match String::from_utf8(v) {
            Ok(s) => {
                *self.0 = s;
                Ok(())
            }
            Err(e) => Err(Error::invalid_value(
                Unexpected::Bytes(&e.into_bytes()),
                &self,
            )),
        }
    }
}