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-rw-r--r--dhall/src/dhall_type.rs77
-rw-r--r--dhall/src/lib.rs2
2 files changed, 79 insertions, 0 deletions
diff --git a/dhall/src/dhall_type.rs b/dhall/src/dhall_type.rs
new file mode 100644
index 0000000..8abef32
--- /dev/null
+++ b/dhall/src/dhall_type.rs
@@ -0,0 +1,77 @@
+use dhall_core::*;
+use dhall_generator::*;
+
+#[derive(Debug, Clone)]
+pub enum DhallConversionError {}
+
+pub trait DhallType: Sized {
+ fn dhall_type() -> DhallExpr;
+ // fn as_dhall(&self) -> DhallExpr;
+ // fn from_dhall(e: DhallExpr) -> Result<Self, DhallConversionError>;
+}
+
+impl DhallType for bool {
+ fn dhall_type() -> DhallExpr {
+ dhall_expr!(Bool)
+ }
+}
+
+impl DhallType for Natural {
+ fn dhall_type() -> DhallExpr {
+ dhall_expr!(Natural)
+ }
+}
+
+impl DhallType for Integer {
+ fn dhall_type() -> DhallExpr {
+ dhall_expr!(Integer)
+ }
+}
+
+impl DhallType for String {
+ fn dhall_type() -> DhallExpr {
+ dhall_expr!(Text)
+ }
+}
+
+impl<A: DhallType, B: DhallType> DhallType for (A, B) {
+ fn dhall_type() -> DhallExpr {
+ let ta = A::dhall_type();
+ let tb = B::dhall_type();
+ dhall_expr!({ _1: ta, _2: tb })
+ }
+}
+
+impl<T: DhallType> DhallType for Option<T> {
+ fn dhall_type() -> DhallExpr {
+ let t = T::dhall_type();
+ dhall_expr!(Optional t)
+ }
+}
+
+impl<T: DhallType> DhallType for Vec<T> {
+ fn dhall_type() -> DhallExpr {
+ let t = T::dhall_type();
+ dhall_expr!(List t)
+ }
+}
+
+impl<'a, T: DhallType> DhallType for &'a T {
+ fn dhall_type() -> DhallExpr {
+ T::dhall_type()
+ }
+}
+
+impl<T> DhallType for std::marker::PhantomData<T> {
+ fn dhall_type() -> DhallExpr {
+ dhall_expr!({})
+ }
+}
+
+impl<T: DhallType, E: DhallType> DhallType for Result<T, E> {
+ fn dhall_type() -> DhallExpr {
+ let tt = T::dhall_type();
+ let te = E::dhall_type();
+ dhall_expr!(< Ok: tt | Err: te>)
+ }
+}
diff --git a/dhall/src/lib.rs b/dhall/src/lib.rs
index d9f9edb..c0c1d6f 100644
--- a/dhall/src/lib.rs
+++ b/dhall/src/lib.rs
@@ -10,8 +10,10 @@
mod normalize;
pub use crate::normalize::*;
pub mod binary;
+mod dhall_type;
pub mod imports;
pub mod typecheck;
+pub use dhall_type::*;
pub use crate::imports::*;