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use std::{
fmt, sync::Arc,
hash::{Hasher, Hash},
};
use smol_str::SmolStr;
use {
yellow::{GreenNode, RedNode, TreeRoot, SyntaxRoot, RedPtr, RefRoot, OwnedRoot, SyntaxText},
SyntaxKind::{self, *},
TextRange, TextUnit,
};
#[derive(Clone, Copy)]
pub struct SyntaxNode<R: TreeRoot = OwnedRoot> {
pub(crate) root: R,
// Guaranteed to not dangle, because `root` holds a
// strong reference to red's ancestor
red: RedPtr,
}
unsafe impl<R: TreeRoot> Send for SyntaxNode<R> {}
unsafe impl<R: TreeRoot> Sync for SyntaxNode<R> {}
impl<R1: TreeRoot, R2: TreeRoot> PartialEq<SyntaxNode<R1>> for SyntaxNode<R2> {
fn eq(&self, other: &SyntaxNode<R1>) -> bool {
self.red == other.red
}
}
impl<R: TreeRoot> Eq for SyntaxNode<R> {}
impl<R: TreeRoot> Hash for SyntaxNode<R> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.red.hash(state)
}
}
pub type SyntaxNodeRef<'a> = SyntaxNode<RefRoot<'a>>;
#[test]
fn syntax_node_ref_is_copy() {
fn assert_copy<T: Copy>(){}
assert_copy::<SyntaxNodeRef>()
}
#[derive(Debug, Clone, PartialEq, Eq, Hash, Ord, PartialOrd)]
pub struct SyntaxError {
pub msg: String,
pub offset: TextUnit,
}
impl SyntaxNode<OwnedRoot> {
pub(crate) fn new_owned(root: SyntaxRoot) -> Self {
let root = OwnedRoot(Arc::new(root));
let red = RedPtr::new(&root.syntax_root().red);
SyntaxNode { root, red }
}
}
impl<'a> SyntaxNode<RefRoot<'a>> {
pub(crate) fn leaf_text_ref(self) -> Option<&'a SmolStr> {
let red = unsafe { self.red.get(self.root.syntax_root()) };
red.green().leaf_text_ref()
}
}
impl<R: TreeRoot> SyntaxNode<R> {
pub fn borrowed<'a>(&'a self) -> SyntaxNodeRef<'a> {
SyntaxNode {
root: self.root.borrowed(),
red: self.red,
}
}
pub fn owned(&self) -> SyntaxNode {
SyntaxNode {
root: self.root.owned(),
red: self.red,
}
}
pub fn kind(&self) -> SyntaxKind {
self.red().green().kind()
}
pub fn range(&self) -> TextRange {
let red = self.red();
TextRange::offset_len(red.start_offset(), red.green().text_len())
}
pub fn text(&self) -> SyntaxText {
SyntaxText::new(self.borrowed())
}
pub fn children(&self) -> impl Iterator<Item = SyntaxNode<R>> {
let red = self.red;
let n_children = self.red().n_children();
let root = self.root.clone();
(0..n_children).map(move |i| {
let red = unsafe { red.get(root.syntax_root()) };
SyntaxNode {
root: root.clone(),
red: red.get_child(i).unwrap(),
}
})
}
pub fn parent(&self) -> Option<SyntaxNode<R>> {
let parent = self.red().parent()?;
Some(SyntaxNode {
root: self.root.clone(),
red: parent,
})
}
pub fn first_child(&self) -> Option<SyntaxNode<R>> {
let red = self.red().get_child(0)?;
Some(SyntaxNode { root: self.root.clone(), red })
}
pub fn last_child(&self) -> Option<SyntaxNode<R>> {
let n = self.red().n_children();
let n = n.checked_sub(1)?;
let red = self.red().get_child(n)?;
Some(SyntaxNode { root: self.root.clone(), red })
}
pub fn next_sibling(&self) -> Option<SyntaxNode<R>> {
let red = self.red();
let parent = self.parent()?;
let next_sibling_idx = red.index_in_parent()? + 1;
let sibling_red = parent.red().get_child(next_sibling_idx)?;
Some(SyntaxNode {
root: self.root.clone(),
red: sibling_red,
})
}
pub fn prev_sibling(&self) -> Option<SyntaxNode<R>> {
let red = self.red();
let parent = self.parent()?;
let prev_sibling_idx = red.index_in_parent()?.checked_sub(1)?;
let sibling_red = parent.red().get_child(prev_sibling_idx)?;
Some(SyntaxNode {
root: self.root.clone(),
red: sibling_red,
})
}
pub fn is_leaf(&self) -> bool {
self.first_child().is_none()
}
pub fn leaf_text(&self) -> Option<SmolStr> {
self.borrowed().leaf_text_ref().map(|it| it.clone())
}
pub(crate) fn replace_with(&self, green: GreenNode) -> GreenNode {
assert_eq!(self.kind(), green.kind());
match self.parent() {
None => green,
Some(parent) => {
let children: Vec<_> = parent.children().map(|child| {
if child == *self {
green.clone()
} else {
child.red().green().clone()
}
}).collect();
let new_parent = GreenNode::new_branch(
parent.kind(),
children.into_boxed_slice(),
);
parent.replace_with(new_parent)
},
}
}
fn red(&self) -> &RedNode {
unsafe { self.red.get(self.root.syntax_root()) }
}
}
impl<R: TreeRoot> fmt::Debug for SyntaxNode<R> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "{:?}@{:?}", self.kind(), self.range())?;
if has_short_text(self.kind()) {
write!(fmt, " \"{}\"", self.text())?;
}
Ok(())
}
}
fn has_short_text(kind: SyntaxKind) -> bool {
match kind {
IDENT | LIFETIME | INT_NUMBER | FLOAT_NUMBER => true,
_ => false,
}
}
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