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|
use crate::imports::ImportRoot;
use dhall_core::*;
use std::marker::PhantomData;
macro_rules! derive_other_traits {
($ty:ident) => {
impl<'a> std::cmp::PartialEq for $ty<'a> {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl<'a> std::cmp::Eq for $ty<'a> {}
impl<'a> std::fmt::Display for $ty<'a> {
fn fmt(
&self,
f: &mut std::fmt::Formatter,
) -> Result<(), std::fmt::Error> {
self.0.fmt(f)
}
}
};
}
#[derive(Debug, Clone)]
pub(crate) struct Parsed<'a>(
pub(crate) SubExpr<Span<'a>, Import>,
pub(crate) ImportRoot,
);
derive_other_traits!(Parsed);
#[derive(Debug, Clone)]
pub(crate) struct Resolved<'a>(
pub(crate) SubExpr<Span<'a>, Normalized<'static>>,
);
derive_other_traits!(Resolved);
#[derive(Debug, Clone)]
pub(crate) struct Typed<'a>(
pub(crate) crate::normalize::Thunk,
pub(crate) Option<Type<'static>>,
pub(crate) PhantomData<&'a ()>,
);
#[derive(Debug, Clone)]
pub(crate) struct Normalized<'a>(
pub(crate) SubExpr<X, X>,
pub(crate) Option<Type<'static>>,
pub(crate) PhantomData<&'a ()>,
);
derive_other_traits!(Normalized);
/// A Dhall expression representing a simple type.
///
/// This captures what is usually simply called a "type", like
/// `Bool`, `{ x: Integer }` or `Natural -> Text`.
///
/// For a more general notion of "type", see [Type].
#[derive(Debug, Clone)]
pub struct SimpleType<'a>(
pub(crate) SubExpr<X, X>,
pub(crate) PhantomData<&'a ()>,
);
derive_other_traits!(SimpleType);
pub(crate) use crate::typecheck::TypeInternal;
/// A Dhall expression representing a (possibly higher-kinded) type.
///
/// This includes [SimpleType]s but also higher-kinded expressions like
/// `Type`, `Kind` and `{ x: Type }`.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Type<'a>(pub(crate) TypeInternal<'a>);
impl<'a> std::fmt::Display for Type<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
match self.0.clone().into_normalized() {
Ok(e) => e.fmt(f),
Err(_) => write!(f, "SuperType"),
}
}
}
// Exposed for the macros
#[doc(hidden)]
impl<'a> From<SimpleType<'a>> for SubExpr<X, X> {
fn from(x: SimpleType<'a>) -> SubExpr<X, X> {
x.0
}
}
// Exposed for the macros
#[doc(hidden)]
impl<'a> From<SubExpr<X, X>> for SimpleType<'a> {
fn from(x: SubExpr<X, X>) -> SimpleType<'a> {
SimpleType(x, PhantomData)
}
}
// Exposed for the macros
#[doc(hidden)]
impl<'a> From<Normalized<'a>> for Typed<'a> {
fn from(x: Normalized<'a>) -> Typed<'a> {
Typed(
crate::normalize::Thunk::new(
crate::normalize::NormalizationContext::new(),
x.0.embed_absurd(),
),
x.1,
x.2,
)
}
}
#[doc(hidden)]
impl<'a> Normalized<'a> {
pub(crate) fn as_expr(&self) -> &SubExpr<X, X> {
&self.0
}
#[allow(dead_code)]
pub(crate) fn unnote<'b>(self) -> Normalized<'b> {
Normalized(self.0, self.1, PhantomData)
}
}
#[doc(hidden)]
impl<'a> Type<'a> {
pub(crate) fn unnote<'b>(self) -> Type<'b> {
// use TypeInternal::*;
// Type(match self.0 {
// Expr(e) => Expr(Box::new(e.unnote())),
// Pi(ctx, c, x, t, e) => Pi(ctx, c, x, t, e),
// Const(c) => Const(c),
// SuperType => SuperType,
// })
// Yes, this is positively horrible. Please forgive me.
unsafe { std::mem::transmute::<Type<'a>, Type<'b>>(self) }
}
}
|
