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use crate::{Prefab, PrefabError, PrefabValue}; use serde::{Deserialize, Serialize}; use std::{ any::{type_name, Any, TypeId}, collections::HashMap, }; type PropsSerializeFactory = Box<dyn Fn(&dyn PropsData) -> Result<PrefabValue, PrefabError> + Send + Sync>; type PropsDeserializeFactory = Box<dyn Fn(PrefabValue, &mut Props) -> Result<(), PrefabError> + Send + Sync>; #[derive(Default)] pub struct PropsRegistry { type_mapping: HashMap<TypeId, String>, factories: HashMap<String, (PropsSerializeFactory, PropsDeserializeFactory)>, } impl PropsRegistry { pub fn register_factory<T>(&mut self, name: &str) where T: 'static + Prefab + PropsData, { let s: PropsSerializeFactory = Box::new(move |data| { if let Some(data) = data.as_any().downcast_ref::<T>() { data.to_prefab() } else { Err(PrefabError::CouldNotSerialize( "Could not downcast to concrete type!".to_owned(), )) } }); let d: PropsDeserializeFactory = Box::new(move |data, props| { props.write(T::from_prefab(data)?); Ok(()) }); self.factories.insert(name.to_owned(), (s, d)); self.type_mapping.insert(TypeId::of::<T>(), name.to_owned()); } pub fn unregister_factory(&mut self, name: &str) { self.factories.remove(name); } pub fn serialize(&self, props: &Props) -> Result<PrefabValue, PrefabError> { let mut group = PropsGroupPrefab::default(); for (t, p) in &props.0 { if let Some(name) = self.type_mapping.get(t) { if let Some(factory) = self.factories.get(name) { group.data.insert(name.to_owned(), (factory.0)(p.as_ref())?); } } else { return Err(PrefabError::CouldNotSerialize( "No type mapping found!".to_owned(), )); } } group.to_prefab() } pub fn deserialize(&self, data: PrefabValue) -> Result<Props, PrefabError> { let data = if data.is_null() { PropsGroupPrefab::default() } else { PropsGroupPrefab::from_prefab(data)? }; let mut props = Props::default(); for (key, value) in data.data { if let Some(factory) = self.factories.get(&key) { (factory.1)(value, &mut props)?; } else { return Err(PrefabError::CouldNotDeserialize(format!( "Could not find properties factory: {:?}", key ))); } } Ok(props) } } #[derive(Debug, Clone)] pub enum PropsError { CouldNotReadData, HasNoDataOfType(String), } impl Prefab for PrefabValue {} impl PropsData for PrefabValue where Self: Clone, { fn clone_props(&self) -> Box<dyn PropsData> { Box::new(self.clone()) } fn as_any(&self) -> &dyn std::any::Any { self } } #[derive(Debug, Default, Clone, Serialize, Deserialize)] pub struct PropsGroupPrefab { #[serde(default)] #[serde(skip_serializing_if = "HashMap::is_empty")] pub data: HashMap<String, PrefabValue>, } impl Prefab for PropsGroupPrefab {} impl PropsData for PropsGroupPrefab where Self: Clone, { fn clone_props(&self) -> Box<dyn PropsData> { Box::new(self.clone()) } fn as_any(&self) -> &dyn std::any::Any { self } } pub trait PropsData: std::fmt::Debug + Send + Sync { fn clone_props(&self) -> Box<dyn PropsData>; fn as_any(&self) -> &dyn Any; } impl Clone for Box<dyn PropsData> { fn clone(&self) -> Self { self.clone_props() } } #[derive(Debug, Default, Clone)] pub struct Props(HashMap<TypeId, Box<dyn PropsData>>); impl Props { pub fn new<T>(data: T) -> Self where T: 'static + PropsData, { let mut result = HashMap::with_capacity(1); result.insert(TypeId::of::<T>(), Box::new(data) as Box<dyn PropsData>); Self(result) } pub fn has<T>(&self) -> bool where T: 'static + PropsData, { let e = TypeId::of::<T>(); self.0.iter().any(|(t, _)| *t == e) } pub fn consume<T>(&mut self) -> Result<Box<dyn PropsData>, PropsError> where T: 'static + PropsData, { if let Some(v) = self.0.remove(&TypeId::of::<T>()) { Ok(v) } else { Err(PropsError::HasNoDataOfType(type_name::<T>().to_owned())) } } pub fn read<T>(&self) -> Result<&T, PropsError> where T: 'static + PropsData, { let e = TypeId::of::<T>(); if let Some((_, v)) = self.0.iter().find(|(t, _)| **t == e) { if let Some(data) = v.as_any().downcast_ref::<T>() { Ok(data) } else { Err(PropsError::CouldNotReadData) } } else { Err(PropsError::HasNoDataOfType(type_name::<T>().to_owned())) } } pub fn map_or_default<T, R, F>(&self, mut f: F) -> R where T: 'static + PropsData, R: Default, F: FnMut(&T) -> R, { match self.read() { Ok(data) => f(data), Err(_) => R::default(), } } pub fn map_or_else<T, R, F, E>(&self, mut f: F, mut e: E) -> R where T: 'static + PropsData, F: FnMut(&T) -> R, E: FnMut() -> R, { match self.read() { Ok(data) => f(data), Err(_) => e(), } } pub fn read_cloned<T>(&self) -> Result<T, PropsError> where T: 'static + PropsData + Clone, { self.read::<T>().map(|v| v.clone()) } pub fn read_cloned_or_default<T>(&self) -> T where T: 'static + PropsData + Clone + Default, { self.read_cloned().unwrap_or_default() } pub fn write<T>(&mut self, data: T) where T: 'static + PropsData, { self.0 .insert(TypeId::of::<T>(), Box::new(data) as Box<dyn PropsData>); } pub fn with<T>(mut self, data: T) -> Self where T: 'static + PropsData, { self.write(data); self } pub fn without<T>(mut self) -> Self where T: 'static + PropsData, { self.0.remove(&TypeId::of::<T>()); self } pub fn merge(self, other: Self) -> Self { let mut result = self.into_inner(); result.extend(other.into_inner()); Self(result) } pub(crate) fn into_inner(self) -> HashMap<TypeId, Box<dyn PropsData>> { self.0 } } impl<T> From<T> for Props where T: 'static + PropsData, { fn from(data: T) -> Self { Self::new(data) } } impl From<&Self> for Props { fn from(data: &Self) -> Self { data.clone() } } #[macro_export] macro_rules! implement_props_data { ($type_name:ty) => { impl $crate::props::PropsData for $type_name where Self: Clone, { fn clone_props(&self) -> Box<dyn $crate::props::PropsData> { Box::new(self.clone()) } fn as_any(&self) -> &dyn std::any::Any { self } } impl $crate::Prefab for $type_name {} }; } implement_props_data!(()); implement_props_data!(i8); implement_props_data!(i16); implement_props_data!(i32); implement_props_data!(i64); implement_props_data!(i128); implement_props_data!(u8); implement_props_data!(u16); implement_props_data!(u32); implement_props_data!(u64); implement_props_data!(u128); implement_props_data!(f32); implement_props_data!(f64); implement_props_data!(bool); implement_props_data!(String);