toml_edit/de/
spanned.rs

1use serde::de::value::BorrowedStrDeserializer;
2use serde::de::IntoDeserializer as _;
3
4use super::Error;
5
6pub(crate) struct SpannedDeserializer<'de, T: serde::de::IntoDeserializer<'de, Error>> {
7    phantom_data: std::marker::PhantomData<&'de ()>,
8    start: Option<usize>,
9    end: Option<usize>,
10    value: Option<T>,
11}
12
13impl<'de, T> SpannedDeserializer<'de, T>
14where
15    T: serde::de::IntoDeserializer<'de, Error>,
16{
17    pub(crate) fn new(value: T, span: std::ops::Range<usize>) -> Self {
18        Self {
19            phantom_data: Default::default(),
20            start: Some(span.start),
21            end: Some(span.end),
22            value: Some(value),
23        }
24    }
25}
26
27impl<'de, T> serde::de::MapAccess<'de> for SpannedDeserializer<'de, T>
28where
29    T: serde::de::IntoDeserializer<'de, Error>,
30{
31    type Error = Error;
32    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
33    where
34        K: serde::de::DeserializeSeed<'de>,
35    {
36        if self.start.is_some() {
37            seed.deserialize(BorrowedStrDeserializer::new(
38                serde_spanned::__unstable::START_FIELD,
39            ))
40            .map(Some)
41        } else if self.end.is_some() {
42            seed.deserialize(BorrowedStrDeserializer::new(
43                serde_spanned::__unstable::END_FIELD,
44            ))
45            .map(Some)
46        } else if self.value.is_some() {
47            seed.deserialize(BorrowedStrDeserializer::new(
48                serde_spanned::__unstable::VALUE_FIELD,
49            ))
50            .map(Some)
51        } else {
52            Ok(None)
53        }
54    }
55
56    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
57    where
58        V: serde::de::DeserializeSeed<'de>,
59    {
60        if let Some(start) = self.start.take() {
61            seed.deserialize(start.into_deserializer())
62        } else if let Some(end) = self.end.take() {
63            seed.deserialize(end.into_deserializer())
64        } else if let Some(value) = self.value.take() {
65            seed.deserialize(value.into_deserializer())
66        } else {
67            panic!("next_value_seed called before next_key_seed")
68        }
69    }
70}
toml_edit/de/spanned.rs

toml_edit/de/
spanned.rs
