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use std::sync::Arc;
use smol_str::SmolStr;
use {SyntaxKind, TextUnit};
#[derive(Clone, Debug)]
pub(crate) enum GreenNode {
Leaf {
kind: SyntaxKind,
text: SmolStr,
},
Branch(Arc<GreenBranch>),
}
impl GreenNode {
pub(crate) fn new_leaf(kind: SyntaxKind, text: &str) -> GreenNode {
GreenNode::Leaf { kind, text: SmolStr::new(text) }
}
pub(crate) fn new_branch(kind: SyntaxKind, children: Box<[GreenNode]>) -> GreenNode {
GreenNode::Branch(Arc::new(GreenBranch::new(kind, children)))
}
pub fn kind(&self) -> SyntaxKind {
match self {
GreenNode::Leaf { kind, .. } => *kind,
GreenNode::Branch(b) => b.kind(),
}
}
pub fn text_len(&self) -> TextUnit {
match self {
GreenNode::Leaf { text, .. } => TextUnit::of_str(text.as_str()),
GreenNode::Branch(b) => b.text_len(),
}
}
pub fn children(&self) -> &[GreenNode] {
match self {
GreenNode::Leaf { .. } => &[],
GreenNode::Branch(b) => b.children(),
}
}
pub fn leaf_text(&self) -> Option<SmolStr> {
self.leaf_text_ref().map(Clone::clone)
}
pub fn leaf_text_ref(&self) -> Option<&SmolStr> {
match self {
GreenNode::Leaf { text, .. } => Some(text),
GreenNode::Branch(_) => None,
}
}
}
#[derive(Clone, Debug)]
pub(crate) struct GreenBranch {
text_len: TextUnit,
kind: SyntaxKind,
children: Box<[GreenNode]>,
}
impl GreenBranch {
fn new(kind: SyntaxKind, children: Box<[GreenNode]>) -> GreenBranch {
let text_len = children.iter().map(|x| x.text_len()).sum::<TextUnit>();
GreenBranch {
text_len,
kind,
children,
}
}
pub fn kind(&self) -> SyntaxKind {
self.kind
}
pub fn text_len(&self) -> TextUnit {
self.text_len
}
pub fn children(&self) -> &[GreenNode] {
&*self.children
}
}
#[test]
fn test_sizes() {
use std::mem::size_of;
println!("GreenBranch = {}", size_of::<GreenBranch>());
println!("GreenNode = {}", size_of::<GreenNode>());
println!("SmolStr = {}", size_of::<SmolStr>());
}
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