71 lines
1.9 KiB
Rust
71 lines
1.9 KiB
Rust
use crate::renderer::context_element::IntoContextElement;
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use std::borrow::Borrow;
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pub trait BreadcrumbTree {
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fn get_ice(&self) -> &dyn IntoContextElement;
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fn get_parent(&self) -> Option<&dyn BreadcrumbTree>;
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}
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pub struct BreadcrumbTreeNode<'a, C: IntoContextElement> {
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parent: Option<&'a dyn BreadcrumbTree>,
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element: BreadcrumbTreeNodeElement<'a, C>,
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}
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pub enum BreadcrumbTreeNodeElement<'a, C: IntoContextElement> {
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Owned(C),
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Borrowed(&'a C),
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}
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impl<'a, C: IntoContextElement> BreadcrumbTreeNode<'a, C> {
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pub fn ice_iter(&'a self) -> impl Iterator<Item = &dyn IntoContextElement> {
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self.breadcrumb_iter().map(|b| b.get_ice())
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}
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pub fn breadcrumb_iter(&'a self) -> BreadcrumbTreeIterator<'a> {
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BreadcrumbTreeIterator(Some(self))
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}
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}
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impl<'a, C: IntoContextElement> Borrow<dyn IntoContextElement + 'a>
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for BreadcrumbTreeNodeElement<'a, C>
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{
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fn borrow(&self) -> &(dyn IntoContextElement + 'a) {
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match self {
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BreadcrumbTreeNodeElement::Owned(ice) => ice,
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BreadcrumbTreeNodeElement::Borrowed(ice) => *ice,
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}
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}
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}
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impl<'a, C: IntoContextElement> BreadcrumbTree for BreadcrumbTreeNode<'a, C> {
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fn get_ice(&self) -> &dyn IntoContextElement {
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self.element.borrow()
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}
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fn get_parent(&self) -> Option<&dyn BreadcrumbTree> {
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self.parent
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}
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}
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impl<'a, C: IntoContextElement> IntoIterator for &'a BreadcrumbTreeNode<'a, C> {
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type Item = &'a dyn BreadcrumbTree;
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type IntoIter = BreadcrumbTreeIterator<'a>;
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fn into_iter(self) -> BreadcrumbTreeIterator<'a> {
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self.breadcrumb_iter()
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}
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}
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pub struct BreadcrumbTreeIterator<'a>(Option<&'a dyn BreadcrumbTree>);
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impl<'a> Iterator for BreadcrumbTreeIterator<'a> {
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type Item = &'a dyn BreadcrumbTree;
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fn next(&mut self) -> Option<Self::Item> {
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let ret = self.0;
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self.0 = self.0.map(|node| node.get_parent()).flatten();
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ret
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}
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}
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