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use std::borrow::Cow;
use dhall::semantics::phase::NormalizedExpr;
use dhall::syntax::ExprKind;
use crate::de::{Deserialize, Error, Result};
use crate::Value;
impl<'a, T> Deserialize for T
where
T: serde::Deserialize<'a>,
{
fn from_dhall(v: &Value) -> Result<Self> {
T::deserialize(Deserializer(Cow::Owned(v.to_expr())))
}
}
struct Deserializer<'a>(Cow<'a, NormalizedExpr>);
impl<'de: 'a, 'a> serde::de::IntoDeserializer<'de, Error> for Deserializer<'a> {
type Deserializer = Deserializer<'a>;
fn into_deserializer(self) -> Self::Deserializer {
self
}
}
impl<'de: 'a, 'a> serde::Deserializer<'de> for Deserializer<'a> {
type Error = Error;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
where
V: serde::de::Visitor<'de>,
{
use std::convert::TryInto;
use ExprKind::*;
match self.0.as_ref().as_ref() {
NaturalLit(n) => {
if let Ok(n64) = (*n).try_into() {
visitor.visit_u64(n64)
} else if let Ok(n32) = (*n).try_into() {
visitor.visit_u32(n32)
} else {
unimplemented!()
}
}
IntegerLit(n) => {
if let Ok(n64) = (*n).try_into() {
visitor.visit_i64(n64)
} else if let Ok(n32) = (*n).try_into() {
visitor.visit_i32(n32)
} else {
unimplemented!()
}
}
RecordLit(m) => visitor.visit_map(
serde::de::value::MapDeserializer::new(m.iter().map(
|(k, v)| (k.as_ref(), Deserializer(Cow::Borrowed(v))),
)),
),
_ => unimplemented!(),
}
}
serde::forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
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