1use serde::de::IntoDeserializer;
2
3use super::Error;
4
5pub(crate) struct KeyDeserializer {
6 span: Option<std::ops::Range<usize>>,
7 key: crate::Key,
8}
9
10impl KeyDeserializer {
11 pub(crate) fn new(key: crate::Key, span: Option<std::ops::Range<usize>>) -> Self {
12 KeyDeserializer { span, key }
13 }
14}
15
16impl IntoDeserializer<'_, Error> for KeyDeserializer {
17 type Deserializer = Self;
18
19 fn into_deserializer(self) -> Self::Deserializer {
20 self
21 }
22}
23
24impl<'de> serde::de::Deserializer<'de> for KeyDeserializer {
25 type Error = Error;
26
27 fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
28 where
29 V: serde::de::Visitor<'de>,
30 {
31 self.key.into_deserializer().deserialize_any(visitor)
32 }
33
34 fn deserialize_enum<V>(
35 self,
36 name: &str,
37 variants: &'static [&'static str],
38 visitor: V,
39 ) -> Result<V::Value, Self::Error>
40 where
41 V: serde::de::Visitor<'de>,
42 {
43 let _ = name;
44 let _ = variants;
45 visitor.visit_enum(self)
46 }
47
48 fn deserialize_struct<V>(
49 self,
50 name: &'static str,
51 fields: &'static [&'static str],
52 visitor: V,
53 ) -> Result<V::Value, Error>
54 where
55 V: serde::de::Visitor<'de>,
56 {
57 if serde_spanned::__unstable::is_spanned(name, fields) {
58 if let Some(span) = self.span.clone() {
59 return visitor.visit_map(super::SpannedDeserializer::new(self.key.get(), span));
60 }
61 }
62 self.deserialize_any(visitor)
63 }
64
65 fn deserialize_newtype_struct<V>(
66 self,
67 _name: &'static str,
68 visitor: V,
69 ) -> Result<V::Value, Error>
70 where
71 V: serde::de::Visitor<'de>,
72 {
73 visitor.visit_newtype_struct(self)
74 }
75
76 serde::forward_to_deserialize_any! {
77 bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
78 bytes byte_buf map option unit
79 ignored_any unit_struct tuple_struct tuple identifier
80 }
81}
82
83impl<'de> serde::de::EnumAccess<'de> for KeyDeserializer {
84 type Error = Error;
85 type Variant = UnitOnly<Self::Error>;
86
87 fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error>
88 where
89 T: serde::de::DeserializeSeed<'de>,
90 {
91 seed.deserialize(self).map(op:unit_only)
92 }
93}
94
95pub(crate) struct UnitOnly<E> {
96 marker: std::marker::PhantomData<E>,
97}
98
99fn unit_only<T, E>(t: T) -> (T, UnitOnly<E>) {
100 (
101 t,
102 UnitOnly {
103 marker: std::marker::PhantomData,
104 },
105 )
106}
107
108impl<'de, E> serde::de::VariantAccess<'de> for UnitOnly<E>
109where
110 E: serde::de::Error,
111{
112 type Error = E;
113
114 fn unit_variant(self) -> Result<(), Self::Error> {
115 Ok(())
116 }
117
118 fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error>
119 where
120 T: serde::de::DeserializeSeed<'de>,
121 {
122 Err(serde::de::Error::invalid_type(
123 serde::de::Unexpected::UnitVariant,
124 &"newtype variant",
125 ))
126 }
127
128 fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error>
129 where
130 V: serde::de::Visitor<'de>,
131 {
132 Err(serde::de::Error::invalid_type(
133 serde::de::Unexpected::UnitVariant,
134 &"tuple variant",
135 ))
136 }
137
138 fn struct_variant<V>(
139 self,
140 _fields: &'static [&'static str],
141 _visitor: V,
142 ) -> Result<V::Value, Self::Error>
143 where
144 V: serde::de::Visitor<'de>,
145 {
146 Err(serde::de::Error::invalid_type(
147 serde::de::Unexpected::UnitVariant,
148 &"struct variant",
149 ))
150 }
151}
152