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use std::sync::{Arc, RwLock};
use {
TextUnit,
yellow::GreenNode,
};
#[derive(Debug)]
pub(crate) struct RedNode {
green: GreenNode,
parent: Option<ParentData>,
children: RwLock<Vec<Option<Arc<RedNode>>>>,
}
#[derive(Debug)]
struct ParentData {
parent: *const 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: *const 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 children = vec![None; green.children().len()];
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) -> Arc<RedNode> {
match &self.children.read().unwrap()[idx] {
Some(child) => return child.clone(),
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, start_offset, idx);
children[idx] = Some(Arc::new(child))
}
children[idx].as_ref().unwrap().clone()
}
}
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