uninode 0.4.2

Universal object type
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
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

//
// Copyright (c) 2022 Oleg Lelenkov <o.lelenkov@gmail.com>
// Distributed under terms of the BSD 3-Clause license.
//

use std::borrow::Cow;

use serde::de::{self, Visitor, IntoDeserializer};

use crate::serialize::error::{UniNodeSerError, Result};

pub struct MapKeyDeserializer<'de> {
    key: Cow<'de, str>,
}

impl<'de> MapKeyDeserializer<'de> {
    pub fn new(key: Cow<'de, str>) -> Self {
        Self { key }
    }
}

macro_rules! deserialize_integer_key {
    ($method:ident => $visit:ident) => {
        fn $method<V>(self, visitor: V) -> Result<V::Value>
        where
            V: Visitor<'de>,
        {
            match (self.key.parse(), self.key) {
                (Ok(integer), _) => visitor.$visit(integer),
                (Err(_), Cow::Borrowed(s)) => visitor.visit_borrowed_str(s),
                (Err(_), Cow::Owned(s)) => visitor.visit_string(s),
            }
        }
    };
}

impl<'de> de::Deserializer<'de> for MapKeyDeserializer<'de> {
    type Error = UniNodeSerError;

    deserialize_integer_key!(deserialize_i8 => visit_i8);

    deserialize_integer_key!(deserialize_i16 => visit_i16);

    deserialize_integer_key!(deserialize_i32 => visit_i32);

    deserialize_integer_key!(deserialize_i64 => visit_i64);

    deserialize_integer_key!(deserialize_u8 => visit_u8);

    deserialize_integer_key!(deserialize_u16 => visit_u16);

    deserialize_integer_key!(deserialize_u32 => visit_u32);

    deserialize_integer_key!(deserialize_u64 => visit_u64);

    serde::forward_to_deserialize_any! {
        bool f32 f64 char str string bytes byte_buf unit unit_struct seq tuple
        tuple_struct map struct identifier ignored_any
    }

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
    where
        V: Visitor<'de>,
    {
        match self.key {
            Cow::Borrowed(string) => visitor.visit_borrowed_str(string),
            Cow::Owned(string) => visitor.visit_string(string),
        }
    }

    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value>
    where
        V: Visitor<'de>,
    {
        visitor.visit_some(self)
    }

    fn deserialize_newtype_struct<V>(
        self, _name: &'static str, visitor: V,
    ) -> Result<V::Value>
    where
        V: Visitor<'de>,
    {
        visitor.visit_newtype_struct(self)
    }

    fn deserialize_enum<V>(
        self, _name: &'static str, _variants: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value>
    where
        V: Visitor<'de>,
    {
        visitor.visit_enum(self.key.into_deserializer())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde::Deserialize;

    #[test]
    fn key_integers() {
        fn assert_deserialize_int<'de, T>(num: &'de str, val: T)
        where
            T: Deserialize<'de> + std::fmt::Debug + std::cmp::PartialEq,
        {
            let de = MapKeyDeserializer::new(Cow::Borrowed(num));
            assert_eq!(T::deserialize(de).unwrap(), val)
        }

        assert_deserialize_int("8", 8i8);
        assert_deserialize_int("16", 16i16);
        assert_deserialize_int("32", 32i32);
        assert_deserialize_int("64", 64i64);
        assert_deserialize_int("8", 8u8);
        assert_deserialize_int("16", 16u16);
        assert_deserialize_int("32", 32u32);
        assert_deserialize_int("64", 64u64);
    }

    #[test]
    fn key_string() {
        let de = MapKeyDeserializer::new(Cow::Borrowed("key"));
        assert_eq!(String::deserialize(de).unwrap(), String::from("key"));
    }

    #[test]
    fn key_option() {
        let de = MapKeyDeserializer::new(Cow::Borrowed("key"));
        assert_eq!(
            Option::<String>::deserialize(de).unwrap(),
            Some(String::from("key"))
        );
    }

    #[test]
    fn key_newtype() {
        #[derive(Debug, Deserialize, PartialEq)]
        struct Key(u8);
        let de = MapKeyDeserializer::new(Cow::Borrowed("42"));
        assert_eq!(Key::deserialize(de).unwrap(), Key(42));
    }

    #[test]
    fn key_enum() {
        #[derive(Debug, Deserialize, PartialEq)]
        enum Key {
            One,
            Two,
        }
        let de = MapKeyDeserializer::new(Cow::Borrowed("One"));
        assert_eq!(Key::deserialize(de).unwrap(), Key::One);
    }
}