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use dhall::semantics::{Hir, Nir};
use dhall::syntax::Expr;
use crate::simple::{Type as SimpleType, Value as SimpleValue};
use crate::{sealed::Sealed, Deserialize, Error};
/// An arbitrary Dhall value.
#[derive(Debug, Clone)]
pub struct Value {
/// Invariant: in normal form
pub(crate) hir: Hir,
/// Cached conversions because they are annoying to construct from Hir.
/// At most one of them will be `Some`.
pub(crate) as_simple_val: Option<SimpleValue>,
pub(crate) as_simple_ty: Option<SimpleType>,
}
impl Value {
pub(crate) fn from_nir(x: &Nir) -> Self {
Value {
hir: x.to_hir_noenv(),
as_simple_val: SimpleValue::from_nir(x),
as_simple_ty: SimpleType::from_nir(x),
}
}
/// Converts a Value into a SimpleValue.
pub fn to_simple_value(&self) -> Option<SimpleValue> {
self.as_simple_val.clone()
}
/// Converts a Value into a SimpleType.
pub fn to_simple_type(&self) -> Option<SimpleType> {
self.as_simple_ty.clone()
}
/// Converts a value back to the corresponding AST expression.
pub(crate) fn to_expr(&self) -> Expr {
self.hir.to_expr(Default::default())
}
}
impl Eq for Value {}
impl PartialEq for Value {
fn eq(&self, other: &Self) -> bool {
self.hir == other.hir
}
}
impl std::fmt::Display for Value {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
self.to_expr().fmt(f)
}
}
impl Sealed for Value {}
impl Deserialize for Value {
fn from_dhall(v: &Value) -> Result<Self, Error> {
Ok(v.clone())
}
}
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