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use std::sync::Arc;
use text_unit::TextUnit;
use SyntaxKind;
type TokenText = String;
#[derive(Debug)]
pub(crate) struct GreenNode {
kind: SyntaxKind,
data: GreenNodeData,
}
impl GreenNode {
pub(crate) fn new_leaf(kind: SyntaxKind, text: TokenText) -> GreenNode {
GreenNode {
kind,
data: GreenNodeData::Leaf(GreenLeaf { text }),
}
}
pub(crate) fn new_branch(
kind: SyntaxKind,
) -> GreenNode {
let branch = GreenBranch {
text_len: 0.into(),
leading_trivia: Trivias::default(),
children: Vec::new(),
};
GreenNode {
kind,
data: GreenNodeData::Branch(branch),
}
}
pub(crate) fn push_trivia(&mut self, kind: SyntaxKind, text: TokenText) {
let branch = match &mut self.data {
GreenNodeData::Branch(branch) => branch,
_ => panic!()
};
branch.text_len += TextUnit::of_str(&text);
let leading = &mut branch.leading_trivia;
branch.children.last_mut().map(|(_, t)| t).unwrap_or(leading)
.push(Arc::new(GreenTrivia { kind, text }));
}
pub(crate) fn push_child(&mut self, node: Arc<GreenNode>) {
let branch = match &mut self.data {
GreenNodeData::Branch(branch) => branch,
_ => panic!()
};
branch.text_len += node.text_len();
branch.children.push((node, Trivias::default()));
}
pub(crate) fn kind(&self) -> SyntaxKind {
self.kind
}
pub(crate) fn text_len(&self) -> TextUnit {
match &self.data {
GreenNodeData::Leaf(l) => l.text_len(),
GreenNodeData::Branch(b) => b.text_len(),
}
}
pub(crate) fn text(&self) -> String {
let mut buff = String::new();
go(self, &mut buff);
return buff;
fn go(node: &GreenNode, buff: &mut String) {
match &node.data {
GreenNodeData::Leaf(l) => buff.push_str(&l.text),
GreenNodeData::Branch(branch) => {
add_trivia(&branch.leading_trivia, buff);
branch.children.iter().for_each(|(child, trivias)| {
go(child, buff);
add_trivia(trivias, buff);
})
}
}
}
fn add_trivia(trivias: &Trivias, buff: &mut String) {
trivias.iter().for_each(|t| buff.push_str(&t.text))
}
}
pub(crate) fn n_children(&self) -> usize {
match &self.data {
GreenNodeData::Leaf(_) => 0,
GreenNodeData::Branch(branch) => branch.children.len(),
}
}
pub(crate) fn nth_child(&self, idx: usize) -> &Arc<GreenNode> {
match &self.data {
GreenNodeData::Leaf(_) => panic!("leaf nodes have no children"),
GreenNodeData::Branch(branch) => &branch.children[idx].0,
}
}
pub(crate) fn nth_trivias(&self, idx: usize) -> &Trivias {
match &self.data {
GreenNodeData::Leaf(_) => panic!("leaf nodes have no children"),
GreenNodeData::Branch(branch) => if idx == 0 {
&branch.leading_trivia
} else {
&branch.children[idx - 1].1
},
}
}
pub(crate) fn is_leaf(&self) -> bool {
match self.data {
GreenNodeData::Leaf(_) => true,
GreenNodeData::Branch(_) => false
}
}
}
#[derive(Debug)]
enum GreenNodeData {
Leaf(GreenLeaf),
Branch(GreenBranch),
}
#[derive(Debug)]
struct GreenLeaf {
text: TokenText
}
#[derive(Debug)]
struct GreenBranch {
text_len: TextUnit,
leading_trivia: Trivias,
children: Vec<(Arc<GreenNode>, Trivias)>,
}
#[derive(Debug)]
pub(crate) struct GreenTrivia {
pub(crate) kind: SyntaxKind,
pub(crate) text: TokenText,
}
type Trivias = Vec<Arc<GreenTrivia>>;
pub(crate) trait TextLen {
fn text_len(&self) -> TextUnit;
}
impl TextLen for GreenTrivia {
fn text_len(&self) -> TextUnit {
TextUnit::of_str(&self.text)
}
}
impl<T: TextLen> TextLen for Arc<T> {
fn text_len(&self) -> TextUnit {
let this: &T = self;
this.text_len()
}
}
impl TextLen for GreenNode {
fn text_len(&self) -> TextUnit {
self.text_len()
}
}
impl TextLen for GreenLeaf {
fn text_len(&self) -> TextUnit {
TextUnit::of_str(&self.text)
}
}
impl TextLen for GreenBranch {
fn text_len(&self) -> TextUnit {
self.text_len
}
}
impl<T: TextLen> TextLen for [T] {
fn text_len(&self) -> TextUnit {
self.iter().map(TextLen::text_len).sum()
}
}
|
