From e762babd9e69400ccd178ba8946168640093eb63 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sat, 15 Apr 2023 18:26:29 +0200
Subject: feat: add deserialization

---
 src/lib.rs | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index 8b13789..e5086bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,55 @@
+//! XML is awful.
+#![deny(clippy::all, clippy::pedantic, unsafe_code, missing_docs)]
+use crate::deserializer::{Deserializer, Error as DeserializerError};
+use crate::tagged::TagStart;
 
+pub mod attribute;
+pub mod deserializer;
+pub mod tagged;
+
+mod event;
+
+/// Trait implemented by types that want to be deserializable from tagged XML elements.
+pub trait DeserializeTagged: Sized
+{
+    /// Error type.
+    type Error: std::error::Error + Send + Sync + 'static;
+
+    /// Deserializes into a new `Self`.
+    ///
+    /// # Errors
+    /// When or if a error is returned is decided by the type implementing this trait.
+    fn deserialize<TDeserializer: Deserializer>(
+        start: &TagStart,
+        deserializer: &mut TDeserializer,
+    ) -> Result<Self, Self::Error>;
+}
+
+/// Result extension.
+pub trait ResultExt<Value, DeError>
+{
+    /// Returns `Ok(None)` if `Err` is `DeserializerError::UnexpectedEvent`.
+    fn try_event(self) -> Result<Option<Value>, DeserializerError<DeError>>;
+}
+
+impl<Value, DeError> ResultExt<Value, DeError>
+    for Result<Value, DeserializerError<DeError>>
+{
+    fn try_event(self) -> Result<Option<Value>, DeserializerError<DeError>>
+    {
+        self.map_or_else(
+            |err| {
+                if let DeserializerError::UnexpectedEvent {
+                    expected_event_name: _,
+                    found_event: _,
+                } = err
+                {
+                    return Ok(None);
+                }
+
+                Err(err)
+            },
+            |value| Ok(Some(value)),
+        )
+    }
+}
-- 
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