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use {
parser_impl::Sink,
yellow::{GreenNode, SyntaxError},
SyntaxKind, TextRange, TextUnit,
};
pub(crate) struct GreenBuilder<'a> {
text: &'a str,
parents: Vec<(SyntaxKind, usize)>,
children: Vec<GreenNode>,
pos: TextUnit,
errors: Vec<SyntaxError>,
}
impl<'a> Sink<'a> for GreenBuilder<'a> {
type Tree = (GreenNode, Vec<SyntaxError>);
fn new(text: &'a str) -> Self {
GreenBuilder {
text,
parents: Vec::new(),
children: Vec::new(),
pos: 0.into(),
errors: Vec::new(),
}
}
fn leaf(&mut self, kind: SyntaxKind, len: TextUnit) {
let range = TextRange::offset_len(self.pos, len);
self.pos += len;
let text = &self.text[range];
self.children.push(
GreenNode::new_leaf(kind, text)
);
}
fn start_internal(&mut self, kind: SyntaxKind) {
let len = self.children.len();
self.parents.push((kind, len));
}
fn finish_internal(&mut self) {
let (kind, first_child) = self.parents.pop().unwrap();
let children: Vec<_> = self.children
.drain(first_child..)
.collect();
self.children.push(
GreenNode::new_branch(kind, children.into_boxed_slice())
);
}
fn error(&mut self, message: String) {
self.errors.push(SyntaxError {
msg: message,
offset: self.pos,
})
}
fn finish(mut self) -> (GreenNode, Vec<SyntaxError>) {
assert_eq!(self.children.len(), 1);
let root = self.children.pop().unwrap();
(root, self.errors)
}
}
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