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authorNadrieril2019-05-09 21:54:45 +0200
committerNadrieril2019-05-09 21:54:45 +0200
commitdae106b3de0888e8a704c0efa3f9d991590f7858 (patch)
tree750daf7cb5b44bed4772ace3457c583c0ef86e4d /dhall/src/api/traits
parent6444faa2dee271e6d22226dc30b659e13fa8aead (diff)
Rewrite the StaticType trait and everything around it
Diffstat (limited to '')
-rw-r--r--dhall/src/api/traits/dynamic_type.rs32
-rw-r--r--dhall/src/api/traits/mod.rs4
-rw-r--r--dhall/src/api/traits/static_type.rs149
3 files changed, 0 insertions, 185 deletions
diff --git a/dhall/src/api/traits/dynamic_type.rs b/dhall/src/api/traits/dynamic_type.rs
deleted file mode 100644
index 7763a28..0000000
--- a/dhall/src/api/traits/dynamic_type.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-use crate::error::TypeError;
-use crate::phase::{Normalized, Type, Typed};
-use crate::traits::StaticType;
-use std::borrow::Cow;
-
-pub trait DynamicType {
- fn get_type<'a>(&'a self) -> Result<Cow<'a, Type>, TypeError>;
-}
-
-impl<T: StaticType> DynamicType for T {
- fn get_type<'a>(&'a self) -> Result<Cow<'a, Type>, TypeError> {
- Ok(Cow::Owned(T::get_static_type()))
- }
-}
-
-impl DynamicType for Type {
- fn get_type(&self) -> Result<Cow<'_, Type>, TypeError> {
- self.get_type()
- }
-}
-
-impl DynamicType for Normalized {
- fn get_type(&self) -> Result<Cow<'_, Type>, TypeError> {
- self.0.get_type()
- }
-}
-
-impl DynamicType for Typed {
- fn get_type(&self) -> Result<Cow<'_, Type>, TypeError> {
- self.get_type()
- }
-}
diff --git a/dhall/src/api/traits/mod.rs b/dhall/src/api/traits/mod.rs
index 315e17a..3fd21e4 100644
--- a/dhall/src/api/traits/mod.rs
+++ b/dhall/src/api/traits/mod.rs
@@ -1,6 +1,2 @@
mod deserialize;
-mod dynamic_type;
-mod static_type;
pub use deserialize::Deserialize;
-pub use dynamic_type::DynamicType;
-pub use static_type::{SimpleStaticType, StaticType};
diff --git a/dhall/src/api/traits/static_type.rs b/dhall/src/api/traits/static_type.rs
deleted file mode 100644
index e05dfff..0000000
--- a/dhall/src/api/traits/static_type.rs
+++ /dev/null
@@ -1,149 +0,0 @@
-use crate::phase::*;
-use dhall_proc_macros as dhall;
-use dhall_syntax::*;
-
-/// A value that has a statically-known Dhall type.
-///
-/// This trait is strictly more general than [SimpleStaticType].
-/// The reason is that it allows an arbitrary [Type] to be returned
-/// instead of just a [SimpleType].
-///
-/// For now the only interesting impl is [SimpleType] itself, who
-/// has a statically-known type which is not itself a [SimpleType].
-pub trait StaticType {
- fn get_static_type() -> Type;
-}
-
-/// A Rust type that can be represented as a Dhall type.
-///
-/// A typical example is `Option<bool>`,
-/// represented by the dhall expression `Optional Bool`.
-///
-/// This trait can and should be automatically derived.
-///
-/// The representation needs to be independent of the value.
-/// For this reason, something like `HashMap<String, bool>` cannot implement
-/// [SimpleStaticType] because each different value would
-/// have a different Dhall record type.
-///
-/// The `Simple` in `SimpleStaticType` indicates that the returned type is
-/// a [SimpleType].
-pub trait SimpleStaticType {
- fn get_simple_static_type() -> SimpleType;
-}
-
-fn mktype(x: SubExpr<X, X>) -> SimpleType {
- x.into()
-}
-
-impl<T: SimpleStaticType> StaticType for T {
- fn get_static_type() -> Type {
- crate::phase::Normalized::from_thunk_and_type(
- crate::core::thunk::Thunk::from_normalized_expr(
- T::get_simple_static_type().into(),
- ),
- Type::const_type(),
- )
- .to_type()
- }
-}
-
-impl StaticType for SimpleType {
- /// By definition, a [SimpleType] has type `Type`.
- /// This returns the Dhall expression `Type`
- fn get_static_type() -> Type {
- Type::const_type()
- }
-}
-
-impl SimpleStaticType for bool {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Bool))
- }
-}
-
-impl SimpleStaticType for Natural {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Natural))
- }
-}
-
-impl SimpleStaticType for u32 {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Natural))
- }
-}
-
-impl SimpleStaticType for u64 {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Natural))
- }
-}
-
-impl SimpleStaticType for Integer {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Integer))
- }
-}
-
-impl SimpleStaticType for i32 {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Integer))
- }
-}
-
-impl SimpleStaticType for i64 {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Integer))
- }
-}
-
-impl SimpleStaticType for String {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!(Text))
- }
-}
-
-impl<A: SimpleStaticType, B: SimpleStaticType> SimpleStaticType for (A, B) {
- fn get_simple_static_type() -> SimpleType {
- let ta: SubExpr<_, _> = A::get_simple_static_type().into();
- let tb: SubExpr<_, _> = B::get_simple_static_type().into();
- mktype(dhall::subexpr!({ _1: ta, _2: tb }))
- }
-}
-
-impl<T: SimpleStaticType> SimpleStaticType for Option<T> {
- fn get_simple_static_type() -> SimpleType {
- let t: SubExpr<_, _> = T::get_simple_static_type().into();
- mktype(dhall::subexpr!(Optional t))
- }
-}
-
-impl<T: SimpleStaticType> SimpleStaticType for Vec<T> {
- fn get_simple_static_type() -> SimpleType {
- let t: SubExpr<_, _> = T::get_simple_static_type().into();
- mktype(dhall::subexpr!(List t))
- }
-}
-
-impl<'a, T: SimpleStaticType> SimpleStaticType for &'a T {
- fn get_simple_static_type() -> SimpleType {
- T::get_simple_static_type()
- }
-}
-
-impl<T> SimpleStaticType for std::marker::PhantomData<T> {
- fn get_simple_static_type() -> SimpleType {
- mktype(dhall::subexpr!({}))
- }
-}
-
-impl<T: SimpleStaticType, E: SimpleStaticType> SimpleStaticType
- for std::result::Result<T, E>
-{
- fn get_simple_static_type() -> SimpleType {
- let tt: SubExpr<_, _> = T::get_simple_static_type().into();
- let te: SubExpr<_, _> = E::get_simple_static_type().into();
- mktype(dhall::subexpr!(< Ok: tt | Err: te>))
- }
-}