33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
//! This module allows building an SSR MatchFinder by parsing the SSR rule
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//! from a comment.
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use ide_db::{
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base_db::{FilePosition, FileRange, SourceDatabase},
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RootDatabase,
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};
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use syntax::{
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ast::{self, AstNode, AstToken},
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TextRange,
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};
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use crate::MatchFinder;
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/// Attempts to build an SSR MatchFinder from a comment at the given file
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/// range. If successful, returns the MatchFinder and a TextRange covering
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/// comment.
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pub fn ssr_from_comment(db: &RootDatabase, frange: FileRange) -> Option<(MatchFinder<'_>, TextRange)> {
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let comment = {
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let file = db.parse(frange.file_id);
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file.tree().syntax().token_at_offset(frange.range.start()).find_map(ast::Comment::cast)
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}?;
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let comment_text_without_prefix = comment.text().strip_prefix(comment.prefix()).unwrap();
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let ssr_rule = comment_text_without_prefix.parse().ok()?;
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let lookup_context = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
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let mut match_finder = MatchFinder::in_context(db, lookup_context, vec![]).ok()?;
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match_finder.add_rule(ssr_rule).ok()?;
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Some((match_finder, comment.syntax().text_range()))
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}
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