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use {
parser_impl::Sink,
yellow::{GreenNode, GreenNodeBuilder, SyntaxError, SyntaxNode, SyntaxRoot},
SyntaxKind, TextRange, TextUnit,
};
pub(crate) struct GreenBuilder<'a> {
text: &'a str,
stack: Vec<GreenNodeBuilder>,
pos: TextUnit,
root: Option<GreenNode>,
errors: Vec<SyntaxError>,
}
impl<'a> Sink<'a> for GreenBuilder<'a> {
type Tree = SyntaxNode;
fn new(text: &'a str) -> Self {
GreenBuilder {
text,
stack: Vec::new(),
pos: 0.into(),
root: None,
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];
let leaf = GreenNodeBuilder::new_leaf(kind, text);
let parent = self.stack.last_mut().unwrap();
parent.push_child(leaf)
}
fn start_internal(&mut self, kind: SyntaxKind) {
self.stack.push(GreenNodeBuilder::new_internal(kind))
}
fn finish_internal(&mut self) {
let builder = self.stack.pop().unwrap();
let node = builder.build();
if let Some(parent) = self.stack.last_mut() {
parent.push_child(node);
} else {
self.root = Some(node);
}
}
fn error(&mut self, message: String) {
self.errors.push(SyntaxError {
message,
offset: self.pos,
})
}
fn finish(self) -> SyntaxNode {
let root = SyntaxRoot::new(self.root.unwrap(), self.errors);
SyntaxNode::new_owned(root)
}
}
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