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|
use std::{
fmt,
sync::Arc,
};
use {
TextRange, TextUnit,
SyntaxKind::{self, *},
yellow::{Ptr, RedNode, GreenNode, TextLen},
};
#[derive(Clone)]
pub struct SyntaxNode {
pub(crate) root: SyntaxRoot,
red: Ptr<RedNode>,
trivia_pos: Option<(usize, usize)>,
}
#[derive(Clone)]
pub struct SyntaxRoot {
red: Arc<RedNode>,
pub(crate) errors: Arc<Vec<SyntaxError>>,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash, Ord, PartialOrd)]
pub(crate) struct SyntaxError {
pub(crate) message: String,
pub(crate) offset: TextUnit,
}
impl SyntaxNode {
pub(crate) fn new(root: Arc<GreenNode>, errors: Vec<SyntaxError>) -> SyntaxNode {
let root = Arc::new(RedNode::new_root(root));
let red = Ptr::new(&root);
let root = SyntaxRoot { red: root, errors: Arc::new(errors) };
SyntaxNode { root, red, trivia_pos: None }
}
pub fn kind(&self) -> SyntaxKind {
let green = self.red().green();
match self.trivia_pos {
None => green.kind(),
Some((i, j)) => green.nth_trivias(i)[j].kind
}
}
pub fn range(&self) -> TextRange {
let red = self.red();
let green = red.green();
match self.trivia_pos {
None => TextRange::offset_len(red.start_offset(), red.green().text_len()),
Some((i, j)) => {
let trivias = green.nth_trivias(i);
let offset = if i == 0 {
red.start_offset()
} else {
let prev_child = red.nth_child(Ptr::clone(&self.red), i - 1);
let mut offset = prev_child.start_offset() + prev_child.green().text_len();
for k in 0..j {
offset += &trivias[k].text_len();
}
offset
};
TextRange::offset_len(offset, trivias[j].text_len())
}
}
}
pub fn text(&self) -> String {
let green = self.red().green();
match self.trivia_pos {
None => green.text(),
Some((i, j)) => green.nth_trivias(i)[j].text.clone()
}
}
pub fn children(&self) -> Vec<SyntaxNode> {
let mut res = Vec::new();
let red = self.red();
let green = red.green();
if green.is_leaf() || self.trivia_pos.is_some() {
return Vec::new();
}
for (j, _) in green.nth_trivias(0).iter().enumerate() {
res.push(SyntaxNode {
root: self.root.clone(),
red: Ptr::clone(&self.red),
trivia_pos: Some((0, j)),
})
}
let n_children = red.n_children();
for i in 0..n_children {
res.push(SyntaxNode {
root: self.root.clone(),
red: Ptr::new(&red.nth_child(Ptr::clone(&self.red), i)),
trivia_pos: None,
});
for (j, _) in green.nth_trivias(i + 1).iter().enumerate() {
res.push(SyntaxNode {
root: self.root.clone(),
red: self.red.clone(),
trivia_pos: Some((i + 1, j)),
})
}
}
res
}
fn red(&self) -> &RedNode {
// Safe b/c root ptr keeps red alive
unsafe { self.red.get() }
}
}
impl fmt::Debug for SyntaxNode {
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 => true,
_ => false,
}
}
|
