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use std::{any::Any, borrow::Cow}; pub enum PropsError { CouldNotReadData, } pub trait PropsData: Any { 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(Clone)] pub struct Props(Box<dyn PropsData>); impl Default for Props { fn default() -> Self { Self(Box::new(())) } } impl std::fmt::Debug for Props { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { f.write_str("Props {...}") } } impl Props { pub fn new<T>(data: T) -> Self where T: 'static + PropsData, { Self(Box::new(data)) } pub fn is<T>(&self) -> bool where T: 'static + PropsData, { self.0.as_any().downcast_ref::<T>().is_some() } pub fn read<T>(&self) -> Result<&T, PropsError> where T: 'static + PropsData, { if let Some(data) = self.0.as_any().downcast_ref::<T>() { Ok(data) } else { Err(PropsError::CouldNotReadData) } } pub fn read_cloned<T>(&self) -> Result<T, PropsError> where T: 'static + PropsData + Clone, { if let Some(data) = self.0.as_any().downcast_ref::<T>() { Ok(data.clone()) } else { Err(PropsError::CouldNotReadData) } } pub fn read_cloned_or_default<T>(&self) -> T where T: 'static + PropsData + Clone + Default, { self.read_cloned().unwrap_or_default() } } impl<T> From<T> for Props where T: 'static + PropsData, { fn from(data: T) -> Self { Self(Box::from(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 } } }; } 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); impl<T> PropsData for Option<T> where T: PropsData + Clone, { fn clone_props(&self) -> Box<dyn PropsData> { Box::new(self.clone()) } fn as_any(&self) -> &dyn Any { self } } impl<T, E> PropsData for Result<T, E> where T: PropsData + Clone, E: 'static + Clone, { fn clone_props(&self) -> Box<dyn PropsData> { Box::new(self.clone()) } fn as_any(&self) -> &dyn Any { self } } impl<T> PropsData for Cow<'static, T> where T: PropsData + Clone, { fn clone_props(&self) -> Box<dyn PropsData> { Box::new(self.clone()) } fn as_any(&self) -> &dyn Any { self } } impl<T> PropsData for Box<T> where T: PropsData + Clone, { fn clone_props(&self) -> Box<dyn PropsData> { self.clone() } fn as_any(&self) -> &dyn Any { self } }