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

use crate::de::Error;

/// Deserializes table values into enum variants.
pub(crate) struct TableEnumDeserializer {
    value: crate::Item,
}

impl TableEnumDeserializer {
    pub(crate) fn new(value: crate::Item) -> Self {
        TableEnumDeserializer { value }
    }
}

impl<'de> serde::de::VariantAccess<'de> for TableEnumDeserializer {
    type Error = Error;

    fn unit_variant(self) -> Result<(), Self::Error> {
        match self.value {
            crate::Item::Table(values) => {
                if values.is_empty() {
                    Ok(())
                } else {
                    Err(Error::custom("expected empty table", values.span()))
                }
            }
            crate::Item::Value(crate::Value::InlineTable(values)) => {
                if values.is_empty() {
                    Ok(())
                } else {
                    Err(Error::custom("expected empty table", values.span()))
                }
            }
            e => Err(Error::custom(
                format!("expected table, found {}", e.type_name()),
                e.span(),
            )),
        }
    }

    fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Self::Error>
    where
        T: serde::de::DeserializeSeed<'de>,
    {
        seed.deserialize(super::ValueDeserializer::new(self.value))
    }

    fn tuple_variant<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: serde::de::Visitor<'de>,
    {
        match self.value {
            crate::Item::Table(values) => {
                let values_span = values.span();
                let tuple_values = values
                    .items
                    .into_iter()
                    .enumerate()
                    .map(
                        |(index, (_, value))| match value.key.get().parse::<usize>() {
                            Ok(key_index) if key_index == index => Ok(value.value),
                            Ok(_) | Err(_) => Err(Error::custom(
                                format!(
                                    "expected table key `{}`, but was `{}`",
                                    index,
                                    value.key.get()
                                ),
                                value.key.span(),
                            )),
                        },
                    )
                    // Fold all values into a `Vec`, or return the first error.
                    .fold(Ok(Vec::with_capacity(len)), |result, value_result| {
                        result.and_then(move |mut tuple_values| match value_result {
                            Ok(value) => {
                                tuple_values.push(value);
                                Ok(tuple_values)
                            }
                            // `Result<de::Value, Self::Error>` to `Result<Vec<_>, Self::Error>`
                            Err(e) => Err(e),
                        })
                    })?;

                if tuple_values.len() == len {
                    serde::de::Deserializer::deserialize_seq(
                        super::ArrayDeserializer::new(tuple_values, values_span),
                        visitor,
                    )
                } else {
                    Err(Error::custom(
                        format!("expected tuple with length {}", len),
                        values_span,
                    ))
                }
            }
            crate::Item::Value(crate::Value::InlineTable(values)) => {
                let values_span = values.span();
                let tuple_values = values
                    .items
                    .into_iter()
                    .enumerate()
                    .map(
                        |(index, (_, value))| match value.key.get().parse::<usize>() {
                            Ok(key_index) if key_index == index => Ok(value.value),
                            Ok(_) | Err(_) => Err(Error::custom(
                                format!(
                                    "expected table key `{}`, but was `{}`",
                                    index,
                                    value.key.get()
                                ),
                                value.key.span(),
                            )),
                        },
                    )
                    // Fold all values into a `Vec`, or return the first error.
                    .fold(Ok(Vec::with_capacity(len)), |result, value_result| {
                        result.and_then(move |mut tuple_values| match value_result {
                            Ok(value) => {
                                tuple_values.push(value);
                                Ok(tuple_values)
                            }
                            // `Result<de::Value, Self::Error>` to `Result<Vec<_>, Self::Error>`
                            Err(e) => Err(e),
                        })
                    })?;

                if tuple_values.len() == len {
                    serde::de::Deserializer::deserialize_seq(
                        super::ArrayDeserializer::new(tuple_values, values_span),
                        visitor,
                    )
                } else {
                    Err(Error::custom(
                        format!("expected tuple with length {}", len),
                        values_span,
                    ))
                }
            }
            e => Err(Error::custom(
                format!("expected table, found {}", e.type_name()),
                e.span(),
            )),
        }
    }

    fn struct_variant<V>(
        self,
        fields: &'static [&'static str],
        visitor: V,
    ) -> Result<V::Value, Self::Error>
    where
        V: serde::de::Visitor<'de>,
    {
        serde::de::Deserializer::deserialize_struct(
            super::ValueDeserializer::new(self.value).with_struct_key_validation(),
            "", // TODO: this should be the variant name
            fields,
            visitor,
        )
    }
}