From 5b91eaa9d6b70a2ac72fe19f2d21871c8d94b017 Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Mon, 6 May 2019 23:21:19 +0200
Subject: Move api-related modules into an api module

---
 dhall/src/api/traits/deserialize.rs | 53 +++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 dhall/src/api/traits/deserialize.rs

(limited to 'dhall/src/api/traits/deserialize.rs')

diff --git a/dhall/src/api/traits/deserialize.rs b/dhall/src/api/traits/deserialize.rs
new file mode 100644
index 0000000..9673cf9
--- /dev/null
+++ b/dhall/src/api/traits/deserialize.rs
@@ -0,0 +1,53 @@
+use crate::error::*;
+use crate::phase::*;
+
+/// A data structure that can be deserialized from a Dhall expression
+///
+/// This is automatically implemented for any type that [serde][serde]
+/// can deserialize.
+///
+/// This trait cannot be implemented manually.
+pub trait Deserialize<'de>: Sized {
+    /// See [dhall::de::from_str][crate::de::from_str]
+    fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self>;
+}
+
+impl<'de> Deserialize<'de> for Parsed {
+    /// Simply parses the provided string. Ignores the
+    /// provided type.
+    fn from_str(s: &'de str, _: Option<&Type>) -> Result<Self> {
+        Ok(Parsed::parse_str(s)?)
+    }
+}
+
+impl<'de> Deserialize<'de> for Resolved {
+    /// Parses and resolves the provided string. Ignores the
+    /// provided type.
+    fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
+        Ok(Parsed::from_str(s, ty)?.resolve()?)
+    }
+}
+
+impl<'de> Deserialize<'de> for Typed {
+    /// Parses, resolves and typechecks the provided string.
+    fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
+        let resolved = Resolved::from_str(s, ty)?;
+        match ty {
+            None => Ok(resolved.typecheck()?),
+            Some(t) => Ok(resolved.typecheck_with(t)?),
+        }
+    }
+}
+
+impl<'de> Deserialize<'de> for Normalized {
+    /// Parses, resolves, typechecks and normalizes the provided string.
+    fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
+        Ok(Typed::from_str(s, ty)?.normalize())
+    }
+}
+
+impl<'de> Deserialize<'de> for Type {
+    fn from_str(s: &'de str, ty: Option<&Type>) -> Result<Self> {
+        Ok(Normalized::from_str(s, ty)?.to_type())
+    }
+}
-- 
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