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use serde::{Deserialize, Serialize}; use std::{ any::{type_name, Any, TypeId}, collections::HashMap, }; #[derive(Debug, Clone)] pub enum PropsError { CouldNotReadData, HasNoDataOfType(String), } #[typetag::serde(tag = "type", content = "value")] 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, Serialize, Deserialize)] pub struct PropsDef(pub HashMap<String, Box<dyn PropsData>>); #[derive(Debug, Default, Clone)] pub struct Props(HashMap<TypeId, Box<dyn PropsData>>); impl Props { pub(crate) fn from_raw(map: HashMap<TypeId, Box<dyn PropsData>>) -> Self { Self(map) } 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, $tag_name:literal) => { #[typetag::serde(name = $tag_name)] 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 } } }; } implement_props_data!((), "()"); implement_props_data!(i8, "i8"); implement_props_data!(i16, "i16"); implement_props_data!(i32, "i32"); implement_props_data!(i64, "i64"); implement_props_data!(i128, "i128"); implement_props_data!(u8, "u8"); implement_props_data!(u16, "u16"); implement_props_data!(u32, "u32"); implement_props_data!(u64, "u64"); implement_props_data!(u128, "u128"); implement_props_data!(f32, "f32"); implement_props_data!(f64, "f64"); implement_props_data!(bool, "bool"); implement_props_data!(String, "String");