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use crate::error::*;
use crate::expr::*;
/// A data structure that can be deserialized from a Dhall expression
///
/// This is automatically implemented for any type that [serde][serde]
/// can deserialize.
///
/// This trait cannot be implemented manually.
pub trait Deserialize<'a>: Sized {
/// See [dhall::de::from_str][crate::de::from_str]
fn from_str(s: &'a str, ty: Option<&Type>) -> Result<Self>;
}
impl<'de: 'a, 'a> Deserialize<'de> for Parsed<'a> {
/// Simply parses the provided string. Ignores the
/// provided type.
fn from_str(s: &'de str, _: Option<&Type>) -> Result<Self> {
Ok(Parsed::parse_str(s)?)
}
}
impl<'de: 'a, 'a> Deserialize<'de> for Resolved<'a> {
/// Parses and resolves the provided string. Ignores the
/// provided type.
fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
Ok(Parsed::from_str(s, ty)?.resolve()?)
}
}
impl<'de: 'a, 'a> Deserialize<'de> for Typed<'a> {
/// Parses, resolves and typechecks the provided string.
fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
let resolved = Resolved::from_str(s, ty)?;
match ty {
None => Ok(resolved.typecheck()?),
Some(t) => Ok(resolved.typecheck_with(t)?),
}
}
}
impl<'de: 'a, 'a> Deserialize<'de> for Normalized<'a> {
/// Parses, resolves, typechecks and normalizes the provided string.
fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
Ok(Typed::from_str(s, ty)?.normalize())
}
}
impl<'de: 'a, 'a> Deserialize<'de> for Type<'a> {
fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
Ok(Normalized::from_str(s, ty)?.into_type())
}
}
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