props: support nesting

crates/bevy_derive/src/lib.rs

@@ -126,6 +126,58 @@ pub fn derive_props(input: TokenStream) -> TokenStream {
                 #bevy_property_path::PropertyIter::new(self)
             }
         }
+
+        impl #impl_generics #bevy_property_path::serde::ser::Serialize for #struct_name#ty_generics {
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: #bevy_property_path::serde::ser::Serializer,
+            {
+                use #bevy_property_path::serde::ser::SerializeMap;
+                let mut state = serializer.serialize_map(Some(self.prop_len()))?;
+                state.serialize_entry("type", self.type_name())?;
+                for (name, prop) in self.iter_props() {
+                    state.serialize_entry(name, prop)?;
+                }
+                state.end()
+            }
+        }
+
+        impl #impl_generics #bevy_property_path::Property for #struct_name#ty_generics {
+            #[inline]
+            fn any(&self) -> &dyn std::any::Any {
+                self
+            }
+            #[inline]
+            fn any_mut(&mut self) -> &mut dyn std::any::Any {
+                self
+            }
+            #[inline]
+            fn clone_prop(&self) -> Box<dyn #bevy_property_path::Property> {
+                Box::new(self.to_dynamic())
+            }
+            #[inline]
+            fn set(&mut self, value: &dyn #bevy_property_path::Property) {
+                // TODO: type check
+                self.apply(value);
+            }
+
+            #[inline]
+            fn apply(&mut self, value: &dyn #bevy_property_path::Property) {
+                if let Some(properties) = value.as_properties() {
+                    for (name, prop) in properties.iter_props() {
+                        self.prop_mut(name).map(|p| p.apply(prop));
+                    }
+                } else {
+                    panic!("attempted to apply non-Properties type to Properties type");
+                }
+            }
+        }
+
+        impl #impl_generics #bevy_property_path::AsProperties for #struct_name#ty_generics {
+            fn as_properties(&self) -> Option<&dyn #bevy_property_path::Properties> {
+                Some(self)
+            }
+        }
     })
 }
 

crates/bevy_property/src/dynamic_properties.rs

@@ -1,6 +1,10 @@
-use std::{collections::HashMap, borrow::Cow};
+use crate::{AsProperties, Properties, Property, PropertyIter, PropertyVal};
-use crate::{Properties, Property, PropertyIter};
+use serde::{
-use serde::{Deserialize, Serialize, ser::SerializeMap, de::{self, MapAccess, Visitor}};
+    de::{self, MapAccess, Visitor},
+    ser::SerializeMap,
+    Deserialize, Serialize,
+};
+use std::{any::Any, borrow::Cow, collections::HashMap};
 
 #[derive(Default)]
 pub struct DynamicProperties {
@@ -151,7 +155,6 @@ impl<'de> Deserialize<'de> for Box<dyn Property> {
 
 struct AnyPropVisiter;
 
-
 impl<'de> Visitor<'de> for AnyPropVisiter {
     type Value = Box<dyn Property>;
     fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
@@ -159,62 +162,86 @@ impl<'de> Visitor<'de> for AnyPropVisiter {
     }
 
     fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v))
     }
 
     fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where E: de::Error {
+    where
+        E: de::Error,
+    {
         Ok(Box::new(v.to_string()))
     }
 
@@ -223,11 +250,57 @@ impl<'de> Visitor<'de> for AnyPropVisiter {
         V: MapAccess<'de>,
     {
         let mut dynamic_properties = DynamicProperties::default();
-        // while let Some(key) = map.next_key()? {
+        while let Some(key) = map.next_key()? {
-        //     let prop = map.next_value()?;
+            let prop = map.next_value::<Box<dyn Property>>()?;
-        //     self.dynamic_properties.set_box(key, prop);
+            if key == "type" {
-        // }
+                dynamic_properties.type_name = prop
-        panic!("aaah");
+                    .val::<String>()
-        // Ok(Box::new(dynamic_properties))
+                    .map(|s| s.clone())
+                    .ok_or_else(|| de::Error::custom("type must be a string"))?;
+            } else {
+                dynamic_properties.set_box(key, prop);
+            }
+        }
+        Ok(Box::new(dynamic_properties))
+    }
+}
+
+impl Property for DynamicProperties {
+    #[inline]
+    fn any(&self) -> &dyn Any {
+        self
+    }
+    #[inline]
+    fn any_mut(&mut self) -> &mut dyn Any {
+        self
+    }
+    #[inline]
+    fn clone_prop(&self) -> Box<dyn Property> {
+        Box::new(self.to_dynamic())
+    }
+    #[inline]
+    fn set(&mut self, value: &dyn Property) {
+        if let Some(properties) = value.as_properties() {
+            *self = properties.to_dynamic();
+        } else {
+            panic!("attempted to apply non-Properties type to Properties type");
+        }
+    }
+
+    #[inline]
+    fn apply(&mut self, value: &dyn Property) {
+        if let Some(properties) = value.as_properties() {
+            for (name, prop) in properties.iter_props() {
+                self.prop_mut(name).map(|p| p.apply(prop));
+            }
+        } else {
+            panic!("attempted to apply non-Properties type to Properties type");
+        }
+    }
+}
+
+impl AsProperties for DynamicProperties {
+    fn as_properties(&self) -> Option<&dyn Properties> {
+        Some(self)
     }
 }

crates/bevy_property/src/lib.rs

@@ -7,3 +7,5 @@ mod dynamic_properties;
 pub use property::*;
 pub use properties::*;
 pub use dynamic_properties::*;
+
+pub use serde;

crates/bevy_property/src/properties.rs

@@ -17,14 +17,7 @@ pub trait Properties {
             panic!("prop does not exist: {}", name);
         }
     }
-    fn apply(&mut self, props: &dyn Properties) {
-        for (name, prop) in props.iter_props() {
-            self.set_prop(name, prop);
-        }
-    }
     fn to_dynamic(&self) -> DynamicProperties
-    where
-        Self: 'static,
     {
         let mut dynamic_props = DynamicProperties::default();
         for (name, prop) in self.iter_props() {

crates/bevy_property/src/property.rs

@@ -1,27 +1,33 @@
+use crate::Properties;
 use serde::Serialize;
 use std::any::Any;
 
-pub trait Property: erased_serde::Serialize + Send + Sync + Any + 'static {
+pub trait Property: erased_serde::Serialize + Send + Sync + Any + AsProperties + 'static {
     fn any(&self) -> &dyn Any;
     fn any_mut(&mut self) -> &mut dyn Any;
     fn clone_prop(&self) -> Box<dyn Property>;
     fn set(&mut self, value: &dyn Property);
+    fn apply(&mut self, value: &dyn Property);
 }
 
 erased_serde::serialize_trait_object!(Property);
 
+pub trait AsProperties {
+    fn as_properties(&self) -> Option<&dyn Properties>;
+}
+
 pub trait PropertyVal {
     fn val<T: 'static>(&self) -> Option<&T>;
     fn set_val<T: 'static>(&mut self, value: T);
 }
 
 impl PropertyVal for dyn Property {
-    // #[inline]
+    #[inline]
     default fn val<T: 'static>(&self) -> Option<&T> {
         self.any().downcast_ref::<T>()
     }
 
-    // #[inline]
+    #[inline]
     default fn set_val<T: 'static>(&mut self, value: T) {
         if let Some(prop) = self.any_mut().downcast_mut::<T>() {
             *prop = value;
@@ -31,6 +37,17 @@ impl PropertyVal for dyn Property {
     }
 }
 
+// TODO: remove specialization
+impl<T> AsProperties for T
+where
+    T: Clone + Serialize + Send + Sync + Any + 'static,
+{
+    fn as_properties(&self) -> Option<&dyn Properties> {
+        None
+    }
+}
+
+
 impl<T> Property for T
 where
     T: Clone + Serialize + Send + Sync + Any + 'static,
@@ -39,14 +56,17 @@ where
     default fn any(&self) -> &dyn Any {
         self
     }
+
     #[inline]
     default fn any_mut(&mut self) -> &mut dyn Any {
         self
     }
+
     #[inline]
     default fn clone_prop(&self) -> Box<dyn Property> {
         Box::new(self.clone())
     }
+
     #[inline]
     default fn set(&mut self, value: &dyn Property) {
         if let Some(prop) = value.any().downcast_ref::<T>() {
@@ -55,6 +75,11 @@ where
             panic!("prop value is not {}", std::any::type_name::<T>());
         }
     }
+
+    #[inline]
+    default fn apply(&mut self, value: &dyn Property) {
+        self.set(value);
+    }
 }
 
 impl Property for usize {
@@ -347,7 +372,6 @@ impl Property for i8 {
     }
 }
 
-
 impl Property for f32 {
     fn set(&mut self, value: &dyn Property) {
         let value = value.any();

examples/scene/properties.rs

@@ -17,22 +17,22 @@ pub struct Test {
     a: usize,
     b: String,
     c: f32,
-    // nest: Nested,
+    nest: Nested,
 }
 
-// #[derive(Properties, Default, Clone)]
+#[derive(Properties, Default)]
-// pub struct Nested {
+pub struct Nested {
-//     d: usize,
+    d: usize,
-// }
+}
 
 fn setup() {
     let mut test = Test {
         a: 1,
         b: "hi".to_string(),
         c: 1.0,
-        // nest: Nested {
+        nest: Nested {
-        //     d: 8,
+            d: 8,
-        // }
+        }
     };
 
     test.set_prop_val::<usize>("a", 2);