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use std::any::{Any, TypeId};
use std::fmt::{self, Debug, Formatter};
use std::hash::Hash;
use std::sync::Arc;
use super::{StyleChain, Template};
use crate::diag::TypResult;
use crate::util::Prehashed;
use crate::Vm;
/// A node that can be realized given some styles.
pub trait Show {
/// Realize the template in the given styles.
fn show(&self, vm: &mut Vm, styles: StyleChain) -> TypResult<Template>;
/// Convert to a packed show node.
fn pack(self) -> ShowNode
where
Self: Debug + Hash + Sized + Sync + Send + 'static,
{
ShowNode::new(self)
}
}
/// A type-erased showable node with a precomputed hash.
#[derive(Clone, Hash)]
pub struct ShowNode(Arc<Prehashed<dyn Bounds>>);
impl ShowNode {
/// Pack any showable node.
pub fn new<T>(node: T) -> Self
where
T: Show + Debug + Hash + Sync + Send + 'static,
{
Self(Arc::new(Prehashed::new(node)))
}
/// The type id of this node.
pub fn id(&self) -> TypeId {
self.0.as_any().type_id()
}
}
impl Show for ShowNode {
fn show(&self, vm: &mut Vm, styles: StyleChain) -> TypResult<Template> {
self.0.show(vm, styles)
}
fn pack(self) -> ShowNode {
self
}
}
impl Debug for ShowNode {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl PartialEq for ShowNode {
fn eq(&self, other: &Self) -> bool {
self.0.eq(&other.0)
}
}
trait Bounds: Show + Debug + Sync + Send + 'static {
fn as_any(&self) -> &dyn Any;
}
impl<T> Bounds for T
where
T: Show + Debug + Hash + Sync + Send + 'static,
{
fn as_any(&self) -> &dyn Any {
self
}
}
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