diff options
Diffstat (limited to 'serde_dhall/src/serde.rs')
-rw-r--r-- | serde_dhall/src/serde.rs | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/serde_dhall/src/serde.rs b/serde_dhall/src/serde.rs new file mode 100644 index 0000000..10d5a17 --- /dev/null +++ b/serde_dhall/src/serde.rs @@ -0,0 +1,61 @@ +use crate::de::{Deserialize, Error, Result}; +use crate::Value; +use dhall_syntax::{ExprF, SubExpr, X}; +use std::borrow::Cow; + +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, SubExpr<X, X>>); + +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 ExprF::*; + match self.0.as_ref().as_ref() { + NaturalLit(n) => match (*n).try_into() { + Ok(n64) => visitor.visit_u64(n64), + Err(_) => match (*n).try_into() { + Ok(n32) => visitor.visit_u32(n32), + Err(_) => unimplemented!(), + }, + }, + IntegerLit(n) => match (*n).try_into() { + Ok(n64) => visitor.visit_i64(n64), + Err(_) => match (*n).try_into() { + Ok(n32) => visitor.visit_i32(n32), + Err(_) => 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 + } +} |