69 lines
1.6 KiB
Rust
69 lines
1.6 KiB
Rust
use std::sync::Arc;
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use {
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SyntaxKind, TextRange, TextUnit,
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yellow::{SyntaxNode, GreenNode, SyntaxError},
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parser::Sink
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};
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pub(crate) struct GreenBuilder {
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text: String,
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stack: Vec<GreenNode>,
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pos: TextUnit,
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root: Option<GreenNode>,
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errors: Vec<SyntaxError>,
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}
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impl GreenBuilder {
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}
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impl Sink for GreenBuilder {
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type Tree = SyntaxNode;
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fn new(text: String) -> Self {
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GreenBuilder {
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text,
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stack: Vec::new(),
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pos: 0.into(),
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root: None,
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errors: Vec::new(),
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}
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}
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fn leaf(&mut self, kind: SyntaxKind, len: TextUnit) {
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let range = TextRange::offset_len(self.pos, len);
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self.pos += len;
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let text = self.text[range].to_owned();
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let parent = self.stack.last_mut().unwrap();
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if kind.is_trivia() {
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parent.push_trivia(kind, text);
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} else {
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let node = GreenNode::new_leaf(kind, text);
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parent.push_child(Arc::new(node));
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}
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}
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fn start_internal(&mut self, kind: SyntaxKind) {
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self.stack.push(GreenNode::new_branch(kind))
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}
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fn finish_internal(&mut self) {
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let node = self.stack.pop().unwrap();
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if let Some(parent) = self.stack.last_mut() {
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parent.push_child(Arc::new(node))
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} else {
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self.root = Some(node);
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}
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}
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fn error(&mut self, message: String) {
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self.errors.push(SyntaxError { message, offset: self.pos })
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}
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fn finish(self) -> SyntaxNode {
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SyntaxNode::new(Arc::new(self.root.unwrap()), self.errors)
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}
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}
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