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use serde::de::value::BorrowedStrDeserializer;
use serde::de::IntoDeserializer as _;
use super::Error;
pub(crate) struct SpannedDeserializer<'de, T: serde::de::IntoDeserializer<'de, Error>> {
phantom_data: std::marker::PhantomData<&'de ()>,
start: Option<usize>,
end: Option<usize>,
value: Option<T>,
}
impl<'de, T> SpannedDeserializer<'de, T>
where
T: serde::de::IntoDeserializer<'de, Error>,
{
pub(crate) fn new(value: T, span: std::ops::Range<usize>) -> Self {
Self {
phantom_data: Default::default(),
start: Some(span.start),
end: Some(span.end),
value: Some(value),
}
}
}
impl<'de, T> serde::de::MapAccess<'de> for SpannedDeserializer<'de, T>
where
T: serde::de::IntoDeserializer<'de, Error>,
{
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.start.is_some() {
seed.deserialize(BorrowedStrDeserializer::new(
serde_spanned::__unstable::START_FIELD,
))
.map(Some)
} else if self.end.is_some() {
seed.deserialize(BorrowedStrDeserializer::new(
serde_spanned::__unstable::END_FIELD,
))
.map(Some)
} else if self.value.is_some() {
seed.deserialize(BorrowedStrDeserializer::new(
serde_spanned::__unstable::VALUE_FIELD,
))
.map(Some)
} else {
Ok(None)
}
}
fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
where
V: serde::de::DeserializeSeed<'de>,
{
if let Some(start) = self.start.take() {
seed.deserialize(start.into_deserializer())
} else if let Some(end) = self.end.take() {
seed.deserialize(end.into_deserializer())
} else if let Some(value) = self.value.take() {
seed.deserialize(value.into_deserializer())
} else {
panic!("next_value_seed called before next_key_seed")
}
}
}
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