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#![feature(get_type_id)]
use core::any::Any;
use std::collections::HashMap;
#[cfg(test)]
mod lib_tests;
pub struct HContext {
parent: Option<Box<HContext>>,
props: HashMap<String, Box<dyn Any + Sync + Send + 'static>>,
}
impl HContext {
pub fn new() -> Self {
HContext {
parent: None,
props: HashMap::new(),
}
}
pub fn from(parent: HContext) -> Self {
HContext {
parent: Some(Box::new(parent)),
props: HashMap::new(),
}
}
pub fn with(mut self, key: impl Into<String>, val: impl Any + Sync + Send + 'static) -> Self {
self.props.insert(key.into(), Box::new(val));
self
}
pub fn get<T: 'static>(&self, key: &str) -> Option<&T> {
if let Some(v) = self.props.get(key) {
v.downcast_ref::<T>()
} else {
if let Some(p) = &self.parent {
p.get(key)
} else {
None
}
}
}
pub fn unwind(self) -> Option<Self> {
if let Some(p) = self.parent {
Some(*p)
} else {
None
}
}
}