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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::fmt::Display for $ty<'a> {
fn fmt(
&self,
f: &mut std::fmt::Formatter,
) -> Result<(), std::fmt::Error> {
self.0.fmt(f)
}
}
};
}
#[derive(Debug, Clone, Eq)]
pub(crate) struct Parsed<'a>(
pub(crate) SubExpr<Span<'a>, Import>,
pub(crate) ImportRoot,
);
derive_other_traits!(Parsed);
#[derive(Debug, Clone, Eq)]
pub(crate) struct Resolved<'a>(
pub(crate) SubExpr<Span<'a>, Normalized<'static>>,
);
derive_other_traits!(Resolved);
#[derive(Debug, Clone, Eq)]
pub(crate) struct Typed<'a>(
pub(crate) SubExpr<X, Normalized<'static>>,
pub(crate) Option<Type<'static>>,
pub(crate) PhantomData<&'a ()>,
);
derive_other_traits!(Typed);
#[derive(Debug, Clone, Eq)]
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, Eq)]
pub struct SimpleType<'a>(
pub(crate) SubExpr<X, X>,
pub(crate) PhantomData<&'a ()>,
);
derive_other_traits!(SimpleType);
/// 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>);
#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) enum TypeInternal<'a> {
Expr(Box<Normalized<'a>>),
Const(dhall_core::Const),
/// The type of `Sort`
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(x.0.embed_absurd(), x.1, x.2)
}
}
#[doc(hidden)]
impl<'a> Typed<'a> {
pub(crate) fn as_expr(&self) -> &SubExpr<X, Normalized<'a>> {
&self.0
}
pub(crate) fn into_expr(self) -> SubExpr<X, Normalized<'a>> {
self.0
}
}
#[doc(hidden)]
impl<'a> Normalized<'a> {
pub(crate) fn as_expr(&self) -> &SubExpr<X, X> {
&self.0
}
pub(crate) fn into_expr(self) -> SubExpr<X, X> {
self.0
}
pub(crate) fn unnote<'b>(self) -> Normalized<'b> {
Normalized(self.0, self.1, PhantomData)
}
pub(crate) fn into_type(self) -> Type<'a> {
Type(match self.0.as_ref() {
ExprF::Const(c) => TypeInternal::Const(*c),
_ => TypeInternal::Expr(Box::new(self)),
})
}
}
#[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())),
Const(c) => Const(c),
SuperType => SuperType,
})
}
}
impl<'a> SimpleType<'a> {
pub(crate) fn into_type(self) -> Type<'a> {
Normalized(self.0, Some(Type::const_type()), PhantomData).into_type()
}
}
|
