WIP serde support

rebased on godot-rust#746 & godot-rust#748 and squashed. Still writing more tests & awaiting final status on those PR's

gdnative-core/Cargo.toml

@@ -12,7 +12,7 @@ edition = "2018"
 
 [features]
 default = ["nativescript"]
-gd_test = []
+gd_test = ["serde", "ron", "serde_json", ]
 nativescript = ["bitflags", "parking_lot"]
 type_tag_fallback = []
 
@@ -24,6 +24,9 @@ glam = "0.16.0"
 indexmap = "1.6.0"
 ahash = "0.7.0"
 once_cell = "1.7.2"
+serde = { version = "1", features = ["derive"], optional = true }
+ron = { version = "0.6.4", optional = true }
+serde_json = { version = "1.0.64", optional = true }
 
 gdnative-impl-proc-macros = { path = "../impl/proc_macros", version = "=0.9.3" }
 

gdnative-core/src/core_types/color.rs

@@ -6,6 +6,7 @@ use crate::core_types::GodotString;
 /// RGBA color with 32 bits floating point components.
 #[repr(C)]
 #[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Color {
     pub r: f32,
     pub g: f32,

gdnative-core/src/core_types/dictionary.rs

@@ -597,6 +597,64 @@ where
     }
 }
 
+#[cfg(feature = "serde")]
+pub(super) mod serde {
+    use super::*;
+    use ::serde::{
+        de::{MapAccess, Visitor},
+        ser::SerializeMap,
+        Deserialize, Deserializer, Serialize, Serializer,
+    };
+    use std::fmt::Formatter;
+
+    impl Serialize for Dictionary {
+        #[inline]
+        fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            let mut ser = ser.serialize_map(Some(self.len() as usize))?;
+            for (key, value) in self.iter() {
+                ser.serialize_entry(&key, &value)?
+            }
+            ser.end()
+        }
+    }
+
+    pub(in super::super) struct DictionaryVisitor;
+
+    impl<'de> Visitor<'de> for DictionaryVisitor {
+        type Value = Dictionary<Unique>;
+
+        fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+            formatter.write_str("a Dictionary")
+        }
+
+        fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+        where
+            A: MapAccess<'de>,
+        {
+            let dict = Dictionary::new();
+            while let Some((key, value)) = map.next_entry::<Variant, Variant>()? {
+                dict.insert(key, value)
+            }
+            Ok(dict)
+        }
+    }
+
+    impl<'de, Access: ThreadAccess> Deserialize<'de> for Dictionary<Access> {
+        #[inline]
+        fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            deserializer
+                .deserialize_map(DictionaryVisitor)
+                .map(|dict| unsafe { dict.cast_access() })
+        }
+    }
+}
+
 godot_test!(test_dictionary {
     use std::collections::HashSet;
 

gdnative-core/src/core_types/error.rs

@@ -2,6 +2,7 @@ use crate::sys;
 
 /// Error codes used in various Godot APIs.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(u32)]
 pub enum GodotError {
     Failed = sys::godot_error_GODOT_FAILED as u32,

gdnative-core/src/core_types/geom/aabb.rs

@@ -3,6 +3,7 @@ use crate::core_types::Vector3;
 /// Axis-aligned bounding box.
 #[repr(C)]
 #[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Aabb {
     pub position: Vector3,
     pub size: Vector3,

gdnative-core/src/core_types/geom/basis.rs

@@ -4,6 +4,7 @@ use core::ops::Mul;
 /// A 3x3 matrix.
 #[repr(C)]
 #[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Basis {
     pub elements: [Vector3; 3],
 }

gdnative-core/src/core_types/geom/plane.rs

@@ -3,6 +3,7 @@ use crate::core_types::{IsEqualApprox, Vector3};
 /// Plane in hessian form.
 #[repr(C)]
 #[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Plane {
     pub normal: Vector3,
     pub d: f32,

gdnative-core/src/core_types/geom/transform.rs

@@ -3,6 +3,7 @@ use crate::core_types::{Basis, Vector3};
 /// 3D Transformation (3x4 matrix) Using basis + origin representation.
 #[repr(C)]
 #[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Transform {
     /// The basis is a matrix containing 3 Vector3 as its columns: X axis, Y axis, and Z axis.
     /// These vectors can be interpreted as the basis vectors of local coordinate system

gdnative-core/src/core_types/mod.rs

@@ -43,7 +43,7 @@ pub use rid::*;
 pub use string::*;
 pub use string_array::*;
 pub use transform2d::*;
-pub use typed_array::TypedArray;
+pub use typed_array::{Element, TypedArray};
 pub use variant::*;
 pub use variant_array::*;
 pub use vector2::*;

gdnative-core/src/core_types/node_path.rs

@@ -176,3 +176,60 @@ impl fmt::Debug for NodePath {
         write!(f, "NodePath({})", self.to_string())
     }
 }
+
+#[cfg(feature = "serde")]
+mod serde {
+    use super::*;
+    use ::serde::{
+        de::{Error, Visitor},
+        Deserialize, Deserializer, Serialize, Serializer,
+    };
+    use std::fmt::Formatter;
+
+    impl Serialize for NodePath {
+        #[inline]
+        fn serialize<S>(&self, ser: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
+        where
+            S: Serializer,
+        {
+            ser.serialize_newtype_struct("NodePath", &*self.to_string())
+        }
+    }
+
+    impl<'de> Deserialize<'de> for NodePath {
+        #[inline]
+        fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            struct NodePathVisitor;
+
+            impl<'de> Visitor<'de> for NodePathVisitor {
+                type Value = NodePath;
+
+                fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+                    formatter.write_str("a NodePath")
+                }
+
+                fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
+                where
+                    E: Error,
+                {
+                    Ok(NodePath::from_str(s))
+                }
+
+                fn visit_newtype_struct<D>(
+                    self,
+                    deserializer: D,
+                ) -> Result<Self::Value, <D as Deserializer<'de>>::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    deserializer.deserialize_str(self)
+                }
+            }
+
+            deserializer.deserialize_newtype_struct("NodePath", NodePathVisitor)
+        }
+    }
+}

gdnative-core/src/core_types/quat.rs

@@ -1,6 +1,7 @@
 use super::IsEqualApprox;
 
 #[derive(Copy, Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Quat {
     pub x: f32,

gdnative-core/src/core_types/rect2.rs

@@ -1,5 +1,6 @@
 use super::Vector2;
 
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Rect2 {
     pub position: Vector2,

gdnative-core/src/core_types/rid.rs

@@ -84,3 +84,46 @@ impl PartialOrd for Rid {
         }
     }
 }
+
+#[cfg(feature = "serde")]
+mod serde {
+    use super::*;
+    use ::serde::{de::{Visitor, Error}, Deserialize, Deserializer, Serialize, Serializer};
+    use std::fmt::Formatter;
+
+    impl Serialize for Rid {
+        #[inline]
+        fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            serializer.serialize_unit()
+        }
+    }
+
+    impl<'de> Deserialize<'de> for Rid {
+        #[inline]
+        fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            struct RidVisitor;
+            impl<'de> Visitor<'de> for RidVisitor {
+                type Value = Rid;
+
+                fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
+                    formatter.write_str("Unit as an RID placeholder")
+                }
+
+                fn visit_unit<E>(self) -> Result<Self::Value, E>
+                where
+                  E: Error,
+                {
+                    Ok(Rid::new())
+                }
+            }
+            deserializer.deserialize_unit(RidVisitor)?;
+            Ok(Rid::new())
+        }
+    }
+}

gdnative-core/src/core_types/string.rs

@@ -612,6 +612,55 @@ where
     }
 }
 
+#[cfg(feature = "serde")]
+mod serde {
+    use super::*;
+    use ::serde::{
+        de::{Error, Visitor},
+        Deserialize, Deserializer, Serialize, Serializer,
+    };
+    use std::fmt::Formatter;
+
+    impl Serialize for GodotString {
+        #[inline]
+        fn serialize<S>(
+            &self,
+            serializer: S,
+        ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
+        where
+            S: Serializer,
+        {
+            serializer.serialize_str(&*self.to_string())
+        }
+    }
+
+    #[cfg(feature = "serde")]
+    impl<'de> serde::Deserialize<'de> for GodotString {
+        #[inline]
+        fn deserialize<D>(deserializer: D) -> Result<Self, <D as Deserializer<'de>>::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            struct GodotStringVisitor;
+            impl<'de> Visitor<'de> for GodotStringVisitor {
+                type Value = GodotString;
+
+                fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+                    formatter.write_str("a GodotString")
+                }
+
+                fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
+                where
+                    E: Error,
+                {
+                    Ok(GodotString::from(s))
+                }
+            }
+
+            deserializer.deserialize_str(GodotStringVisitor)
+        }
+    }
+}
 godot_test!(test_string {
     use crate::core_types::{GodotString, Variant, VariantType, ToVariant};
 

gdnative-core/src/core_types/transform2d.rs

@@ -1,5 +1,6 @@
 use super::Vector2;
 
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Transform2D {
     pub x: Vector2,

gdnative-core/src/core_types/typed_array.rs

@@ -483,3 +483,63 @@ macros::impl_typed_array_element! {
 mod private {
     pub trait Sealed {}
 }
+
+#[cfg(feature = "serde")]
+mod serde {
+    use super::*;
+    use ::serde::{
+        de::{SeqAccess, Visitor},
+        ser::SerializeSeq,
+        Deserialize, Deserializer, Serialize, Serializer,
+    };
+    use std::fmt::Formatter;
+    use std::marker::PhantomData;
+
+    impl<T: Serialize + Element> Serialize for TypedArray<T> {
+        #[inline]
+        fn serialize<S>(&self, ser: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
+        where
+            S: Serializer,
+        {
+            let read = self.read();
+            let mut ser = ser.serialize_seq(Some(read.len()))?;
+            for e in read.iter() {
+                ser.serialize_element(e)?
+            }
+            ser.end()
+        }
+    }
+
+    impl<'de, T: Deserialize<'de> + Element> Deserialize<'de> for TypedArray<T> {
+        #[inline]
+        fn deserialize<D>(deserializer: D) -> Result<Self, <D as Deserializer<'de>>::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            struct TypedArrayVisitor<T>(PhantomData<T>);
+            impl<'de, T: Deserialize<'de> + Element> Visitor<'de> for TypedArrayVisitor<T> {
+                type Value = TypedArray<T>;
+
+                fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+                    formatter.write_str(std::any::type_name::<Self::Value>())
+                }
+
+                fn visit_seq<A>(
+                    self,
+                    mut seq: A,
+                ) -> Result<Self::Value, <A as SeqAccess<'de>>::Error>
+                where
+                    A: SeqAccess<'de>,
+                {
+                    let mut vec = seq.size_hint().map_or_else(Vec::new, Vec::with_capacity);
+                    while let Some(val) = seq.next_element::<T>()? {
+                        vec.push(val);
+                    }
+                    Ok(Self::Value::from_vec(vec))
+                }
+            }
+
+            deserializer.deserialize_seq(TypedArrayVisitor::<T>(PhantomData))
+        }
+    }
+}