Implement serialization

1 files changed, 67 insertions, 0 deletions

diff --git a/serde_dhall/src/options/ser.rs b/serde_dhall/src/options/ser.rs
new file mode 100644
index 0000000..026dd21
--- /dev/null
+++ b/serde_dhall/src/options/ser.rs
@@ -0,0 +1,67 @@
+use crate::{Result, SimpleType, StaticType, ToDhall};
+
+#[derive(Debug, Clone, Copy)]
+pub struct NoAnnot;
+#[derive(Debug, Clone, Copy)]
+pub struct ManualAnnot<'ty>(&'ty SimpleType);
+#[derive(Debug, Clone, Copy)]
+pub struct StaticAnnot;
+
+pub trait RequiredAnnot<A> {
+    fn get_annot(a: &A) -> SimpleType;
+}
+impl<'ty, T> RequiredAnnot<ManualAnnot<'ty>> for T {
+    fn get_annot(a: &ManualAnnot<'ty>) -> SimpleType {
+        a.0.clone()
+    }
+}
+impl<T: StaticType> RequiredAnnot<StaticAnnot> for T {
+    fn get_annot(_: &StaticAnnot) -> SimpleType {
+        T::static_type()
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct Serializer<'a, T, A> {
+    data: &'a T,
+    annot: A,
+}
+
+impl<'a, T> Serializer<'a, T, NoAnnot> {
+    pub fn type_annotation<'ty>(
+        self,
+        ty: &'ty SimpleType,
+    ) -> Serializer<'a, T, ManualAnnot<'ty>> {
+        Serializer {
+            annot: ManualAnnot(ty),
+            data: self.data,
+        }
+    }
+
+    pub fn static_type_annotation(self) -> Serializer<'a, T, StaticAnnot> {
+        Serializer {
+            annot: StaticAnnot,
+            data: self.data,
+        }
+    }
+}
+
+impl<'a, T, A> Serializer<'a, T, A> {
+    pub fn to_string(&self) -> Result<String>
+    where
+        T: ToDhall + RequiredAnnot<A>,
+    {
+        let val = self.data.to_dhall(&T::get_annot(&self.annot))?;
+        Ok(val.to_string())
+    }
+}
+
+pub fn serialize<'a, T>(data: &'a T) -> Serializer<'a, T, NoAnnot>
+where
+    T: ToDhall,
+{
+    Serializer {
+        data,
+        annot: NoAnnot,
+    }
+}