74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
//! This module defines Concrete Syntax Tree (CST), used by rust-analyzer.
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//!
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//! The CST includes comments and whitespace, provides a single node type,
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//! `SyntaxNode`, and a basic traversal API (parent, children, siblings).
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//!
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//! The *real* implementation is in the (language-agnostic) `rowan` crate, this
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//! module just wraps its API.
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use rowan::{GreenNodeBuilder, Language};
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use crate::{Parse, SyntaxError, SyntaxKind, TextSize};
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pub(crate) use rowan::{GreenNode, GreenToken, NodeOrToken};
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub enum RustLanguage {}
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impl Language for RustLanguage {
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type Kind = SyntaxKind;
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fn kind_from_raw(raw: rowan::SyntaxKind) -> SyntaxKind {
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SyntaxKind::from(raw.0)
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}
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fn kind_to_raw(kind: SyntaxKind) -> rowan::SyntaxKind {
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rowan::SyntaxKind(kind.into())
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}
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}
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pub type SyntaxNode = rowan::SyntaxNode<RustLanguage>;
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pub type SyntaxToken = rowan::SyntaxToken<RustLanguage>;
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pub type SyntaxElement = rowan::SyntaxElement<RustLanguage>;
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pub type SyntaxNodeChildren = rowan::SyntaxNodeChildren<RustLanguage>;
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pub type SyntaxElementChildren = rowan::SyntaxElementChildren<RustLanguage>;
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#[derive(Default)]
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pub struct SyntaxTreeBuilder {
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errors: Vec<SyntaxError>,
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inner: GreenNodeBuilder<'static>,
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}
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impl SyntaxTreeBuilder {
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pub(crate) fn finish_raw(self) -> (GreenNode, Vec<SyntaxError>) {
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let green = self.inner.finish();
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(green, self.errors)
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}
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pub fn finish(self) -> Parse<SyntaxNode> {
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let (green, errors) = self.finish_raw();
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if cfg!(debug_assertions) {
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let node = SyntaxNode::new_root(green.clone());
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crate::validation::validate_block_structure(&node);
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}
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Parse::new(green, errors)
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}
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pub fn token(&mut self, kind: SyntaxKind, text: &str) {
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let kind = RustLanguage::kind_to_raw(kind);
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self.inner.token(kind, text)
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}
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pub fn start_node(&mut self, kind: SyntaxKind) {
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let kind = RustLanguage::kind_to_raw(kind);
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self.inner.start_node(kind)
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}
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pub fn finish_node(&mut self) {
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self.inner.finish_node()
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}
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pub fn error(&mut self, error: parser::ParseError, text_pos: TextSize) {
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self.errors.push(SyntaxError::new_at_offset(*error.0, text_pos))
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}
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}
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