60 lines
1.9 KiB
Rust
60 lines
1.9 KiB
Rust
//! Lexing, bridging to ra_parser (which does the actual parsing) and
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//! incremental reparsing.
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mod lexer;
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mod text_token_source;
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mod text_tree_sink;
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mod reparsing;
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use crate::{syntax_node::GreenNode, AstNode, SyntaxError, SyntaxNode};
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use text_token_source::TextTokenSource;
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use text_tree_sink::TextTreeSink;
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pub use lexer::*;
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pub(crate) use self::reparsing::incremental_reparse;
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use ra_parser::SyntaxKind;
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pub(crate) fn parse_text(text: &str) -> (GreenNode, Vec<SyntaxError>) {
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let (tokens, lexer_errors) = tokenize(&text);
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let mut token_source = TextTokenSource::new(text, &tokens);
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let mut tree_sink = TextTreeSink::new(text, &tokens);
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ra_parser::parse(&mut token_source, &mut tree_sink);
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let (tree, mut parser_errors) = tree_sink.finish();
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parser_errors.extend(lexer_errors);
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(tree, parser_errors)
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}
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/// Returns `text` parsed as a `T` provided there are no parse errors.
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pub(crate) fn parse_text_fragment<T: AstNode>(
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text: &str,
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fragment_kind: ra_parser::FragmentKind,
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) -> Result<T, ()> {
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let (tokens, lexer_errors) = tokenize(&text);
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if !lexer_errors.is_empty() {
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return Err(());
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}
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let mut token_source = TextTokenSource::new(text, &tokens);
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let mut tree_sink = TextTreeSink::new(text, &tokens);
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// TextTreeSink assumes that there's at least some root node to which it can attach errors and
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// tokens. We arbitrarily give it a SourceFile.
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use ra_parser::TreeSink;
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tree_sink.start_node(SyntaxKind::SOURCE_FILE);
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ra_parser::parse_fragment(&mut token_source, &mut tree_sink, fragment_kind);
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tree_sink.finish_node();
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let (tree, parser_errors) = tree_sink.finish();
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use ra_parser::TokenSource;
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if !parser_errors.is_empty() || token_source.current().kind != SyntaxKind::EOF {
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return Err(());
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}
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SyntaxNode::new_root(tree).first_child().and_then(T::cast).ok_or(())
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}
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