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

use serde::de::IntoDeserializer;

use crate::de::Error;

impl<'de, 'a> serde::Deserializer<'de> for crate::Value {
    type Error = Error;

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: serde::de::Visitor<'de>,
    {
        match self {
            crate::Value::String(v) => visitor.visit_string(v.into_value()),
            crate::Value::Integer(v) => visitor.visit_i64(v.into_value()),
            crate::Value::Float(v) => visitor.visit_f64(v.into_value()),
            crate::Value::Boolean(v) => visitor.visit_bool(v.into_value()),
            crate::Value::Datetime(v) => visitor.visit_map(DatetimeDeserializer {
                date: v.into_value(),
                visited: false,
            }),
            crate::Value::Array(v) => visitor.visit_seq(crate::de::ArraySeqAccess::with_array(v)),
            crate::Value::InlineTable(v) => {
                visitor.visit_map(crate::de::InlineTableMapAccess::new(v))
            }
        }
    }

    fn deserialize_struct<V>(
        self,
        name: &'static str,
        fields: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: serde::de::Visitor<'de>,
    {
        if name == crate::datetime::dt_serde::NAME && fields == [crate::datetime::dt_serde::FIELD] {
            if let crate::Value::Datetime(d) = self {
                return visitor.visit_map(DatetimeDeserializer {
                    date: d.into_value(),
                    visited: false,
                });
            }
        }

        self.deserialize_any(visitor)
    }

    // `None` is interpreted as a missing field so be sure to implement `Some`
    // as a present field.
    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: serde::de::Visitor<'de>,
    {
        visitor.visit_some(self)
    }

    // Called when the type to deserialize is an enum, as opposed to a field in the type.
    fn deserialize_enum<V>(
        self,
        _name: &'static str,
        _variants: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Error>
    where
        V: serde::de::Visitor<'de>,
    {
        match self {
            crate::Value::String(v) => visitor.visit_enum(v.into_value().into_deserializer()),
            crate::Value::InlineTable(v) => {
                if v.is_empty() {
                    Err(crate::de::Error::custom(
                        "wanted exactly 1 element, found 0 elements",
                    ))
                } else if v.len() != 1 {
                    Err(crate::de::Error::custom(
                        "wanted exactly 1 element, more than 1 element",
                    ))
                } else {
                    visitor.visit_enum(crate::de::InlineTableMapAccess::new(v))
                }
            }
            _ => Err(crate::de::Error::custom("wanted string or inline table")),
        }
    }

    serde::forward_to_deserialize_any! {
        bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
        bytes byte_buf map unit newtype_struct
        ignored_any unit_struct tuple_struct tuple identifier
    }
}

impl<'de> serde::de::IntoDeserializer<'de, crate::de::Error> for crate::Value {
    type Deserializer = Self;

    fn into_deserializer(self) -> Self {
        self
    }
}

struct DatetimeDeserializer {
    visited: bool,
    date: crate::Datetime,
}

impl<'de> serde::de::MapAccess<'de> for DatetimeDeserializer {
    type Error = Error;

    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
    where
        K: serde::de::DeserializeSeed<'de>,
    {
        if self.visited {
            return Ok(None);
        }
        self.visited = true;
        seed.deserialize(DatetimeFieldDeserializer).map(Some)
    }

    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
    where
        V: serde::de::DeserializeSeed<'de>,
    {
        seed.deserialize(self.date.to_string().into_deserializer())
    }
}

struct DatetimeFieldDeserializer;

impl<'de> serde::de::Deserializer<'de> for DatetimeFieldDeserializer {
    type Error = Error;

    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
    where
        V: serde::de::Visitor<'de>,
    {
        visitor.visit_borrowed_str(crate::datetime::dt_serde::FIELD)
    }

    serde::forward_to_deserialize_any! {
        bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
        bytes byte_buf map struct option unit newtype_struct
        ignored_any unit_struct tuple_struct tuple enum identifier
    }
}