add serde support

wip

Cargo.toml

@@ -12,7 +12,7 @@ rust-version = "1.82"
 edition = "2021"
 
 [features]
-default = ["span"]
+default = ["span", "serde"]
 span = []
 v1-fallback = ["v1"]
 v1 = ["kdlv1"]
@@ -23,6 +23,7 @@ members = ["tools/*"]
 [dependencies]
 miette.workspace = true
 num = "0.4.2"
+serde = { version = "1.0.210", optional = true }
 winnow = { version = "0.7.13", features = ["alloc", "unstable-recover"] }
 kdlv1 = { package = "kdl", version = "4.7.0", optional = true }
 

src/de.rs

@@ -0,0 +1,235 @@
+use serde::{de, Deserialize};
+use thiserror::Error;
+use winnow::{stream::Recoverable, Located};
+
+use crate::{v2_parser::KdlParseError, KdlParseFailure};
+
+/// serde deserializer for KDL documents
+#[derive(Debug)]
+pub struct Deserializer<'de> {
+    input: Recoverable<Located<&'de str>, KdlParseError>,
+}
+
+impl<'de> Deserializer<'de> {
+    /// Create a new deserializer from a string
+    pub fn from_str(input: &'de str) -> Self {
+        Self {
+            input: Recoverable::new(Located::new(input)),
+        }
+    }
+}
+
+/// Deserialize a type from a KDL string
+pub fn from_str<'a, T>(input: &'a str) -> Result<T, KdlParseFailure>
+where
+    T: Deserialize<'a>,
+{
+}
+
+#[derive(Debug, Error)]
+struct DeError(String);
+
+impl std::fmt::Display for DeError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl de::Error for DeError {
+    fn custom<T: std::fmt::Display>(msg: T) -> Self {
+        DeError(msg.to_string())
+    }
+}
+
+struct KdlVisitor;
+
+impl<'de> de::Visitor<'de> for KdlVisitor {
+    type Value = ();
+
+    fn expecting<'a>(&self, formatter: &mut std::fmt::Formatter<'a>) -> std::fmt::Result {
+        write!(formatter, "a KDL value")
+    }
+
+    fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+    where
+        A: de::MapAccess<'de>,
+    {
+        while let Some(key) = map.next_key()? {
+            match key {
+                "type" => {
+                    let value = map.next_value::<String>()?;
+                    println!("type: {}", value);
+                }
+                "value" => {
+                    let value = map.next_value::<String>()?;
+                    println!("value: {}", value);
+                }
+                _ => {
+                    map.next_value::<serde::de::IgnoredAny>()?;
+                }
+            }
+        }
+
+        Ok(())
+    }
+}
+
+impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
+    type Error = DeError;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        self.deserialize_map(visitor)
+    }
+
+    fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_unit_struct<V>(
+        self,
+        name: &'static str,
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_newtype_struct<V>(
+        self,
+        name: &'static str,
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_tuple_struct<V>(
+        self,
+        name: &'static str,
+        len: usize,
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_struct<V>(
+        self,
+        name: &'static str,
+        fields: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_enum<V>(
+        self,
+        name: &'static str,
+        variants: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+
+    fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        todo!()
+    }
+}

src/lib.rs

@@ -209,3 +209,8 @@ mod node;
 mod value;
 
 mod v2_parser;
+
+#[cfg(feature = "serde")]
+pub mod de;
+#[cfg(feature = "serde")]
+pub mod se;

src/se.rs

@@ -0,0 +1 @@
+