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use std::{ptr, sync::RwLock};
use {yellow::GreenNode, TextUnit};
#[derive(Debug)]
pub(crate) struct RedNode {
green: GreenNode,
parent: Option<ParentData>,
children: RwLock<Box<[Option<RedNode>]>>,
}
#[derive(Debug)]
struct ParentData {
parent: ptr::NonNull<RedNode>,
start_offset: TextUnit,
index_in_parent: usize,
}
impl RedNode {
pub fn new_root(green: GreenNode) -> RedNode {
RedNode::new(green, None)
}
fn new_child(
green: GreenNode,
parent: ptr::NonNull<RedNode>,
start_offset: TextUnit,
index_in_parent: usize,
) -> RedNode {
let parent_data = ParentData {
parent,
start_offset,
index_in_parent,
};
RedNode::new(green, Some(parent_data))
}
fn new(green: GreenNode, parent: Option<ParentData>) -> RedNode {
let n_children = green.children().len();
let children = (0..n_children).map(|_| None)
.collect::<Vec<_>>()
.into_boxed_slice();
RedNode {
green,
parent,
children: RwLock::new(children),
}
}
pub(crate) fn green(&self) -> &GreenNode {
&self.green
}
pub(crate) fn start_offset(&self) -> TextUnit {
match &self.parent {
None => 0.into(),
Some(p) => p.start_offset,
}
}
pub(crate) fn n_children(&self) -> usize {
self.green.children().len()
}
pub(crate) fn nth_child(&self, idx: usize) -> ptr::NonNull<RedNode> {
match &self.children.read().unwrap()[idx] {
Some(child) => return child.into(),
None => (),
}
let mut children = self.children.write().unwrap();
if children[idx].is_none() {
let green_children = self.green.children();
let start_offset = self.start_offset()
+ green_children[..idx]
.iter()
.map(|x| x.text_len())
.sum::<TextUnit>();
let child =
RedNode::new_child(green_children[idx].clone(), self.into(), start_offset, idx);
children[idx] = Some(child)
}
children[idx].as_ref().unwrap().into()
}
pub(crate) fn parent(&self) -> Option<ptr::NonNull<RedNode>> {
Some(self.parent.as_ref()?.parent)
}
}
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