1use serde::de::IntoDeserializer;
2
3use super::Error;
4
5pub(crate) struct KeyDeserializer {
6 span: Option<std::ops::Range<usize>>,
7 key: crate::InternalString,
8}
9
10impl KeyDeserializer {
11 pub(crate) fn new(key: crate::InternalString, span: Option<std::ops::Range<usize>>) -> Self {
12 KeyDeserializer { span, key }
13 }
14}
15
16impl<'de> serde::de::IntoDeserializer<'de, 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.as_str(), span));
60 }
61 }
62 self.deserialize_any(visitor)
63 }
64
65 serde::forward_to_deserialize_any! {
66 bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
67 bytes byte_buf map option unit newtype_struct
68 ignored_any unit_struct tuple_struct tuple identifier
69 }
70}
71
72impl<'de> serde::de::EnumAccess<'de> for KeyDeserializer {
73 type Error = super::Error;
74 type Variant = UnitOnly<Self::Error>;
75
76 fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error>
77 where
78 T: serde::de::DeserializeSeed<'de>,
79 {
80 seed.deserialize(self).map(op:unit_only)
81 }
82}
83
84pub(crate) struct UnitOnly<E> {
85 marker: std::marker::PhantomData<E>,
86}
87
88fn unit_only<T, E>(t: T) -> (T, UnitOnly<E>) {
89 (
90 t,
91 UnitOnly {
92 marker: std::marker::PhantomData,
93 },
94 )
95}
96
97impl<'de, E> serde::de::VariantAccess<'de> for UnitOnly<E>
98where
99 E: serde::de::Error,
100{
101 type Error = E;
102
103 fn unit_variant(self) -> Result<(), Self::Error> {
104 Ok(())
105 }
106
107 fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error>
108 where
109 T: serde::de::DeserializeSeed<'de>,
110 {
111 Err(serde::de::Error::invalid_type(
112 serde::de::Unexpected::UnitVariant,
113 &"newtype variant",
114 ))
115 }
116
117 fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error>
118 where
119 V: serde::de::Visitor<'de>,
120 {
121 Err(serde::de::Error::invalid_type(
122 serde::de::Unexpected::UnitVariant,
123 &"tuple variant",
124 ))
125 }
126
127 fn struct_variant<V>(
128 self,
129 _fields: &'static [&'static str],
130 _visitor: V,
131 ) -> Result<V::Value, Self::Error>
132 where
133 V: serde::de::Visitor<'de>,
134 {
135 Err(serde::de::Error::invalid_type(
136 serde::de::Unexpected::UnitVariant,
137 &"struct variant",
138 ))
139 }
140}
141