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Factor out pick_best_token ide pattern into ide_db

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This commit is contained in:
Lukas Wirth 2021-06-22 17:28:07 +02:00
parent 4e2ec914f4
commit f615efdfc3
9 changed files with 62 additions and 101 deletions
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24
crates/ide/src/doc_links.rs
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@ -16,11 +16,10 @@ use hir::{
};
use ide_db::{
defs::{Definition, NameClass, NameRefClass},
helpers::pick_best_token,
RootDatabase,
};
use syntax::{
ast, match_ast, AstNode, SyntaxKind::*, SyntaxNode, SyntaxToken, TextRange, TokenAtOffset, T,
};
use syntax::{ast, match_ast, AstNode, SyntaxKind::*, SyntaxNode, TextRange, T};
use crate::{FilePosition, Semantics};
@ -102,7 +101,12 @@ pub(crate) fn external_docs(
) -> Option<DocumentationLink> {
let sema = Semantics::new(db);
let file = sema.parse(position.file_id).syntax().clone();
let token = pick_best(file.token_at_offset(position.offset))?;
let token = pick_best_token(file.token_at_offset(position.offset), |kind| match kind {
IDENT | INT_NUMBER => 3,
T!['('] | T![')'] => 2,
kind if kind.is_trivia() => 0,
_ => 1,
})?;
let token = sema.descend_into_macros(token);
let node = token.parent()?;
@ -522,18 +526,6 @@ fn get_symbol_fragment(db: &dyn HirDatabase, field_or_assoc: &FieldOrAssocItem)
})
}
fn pick_best(tokens: TokenAtOffset<SyntaxToken>) -> Option<SyntaxToken> {
return tokens.max_by_key(priority);
fn priority(n: &SyntaxToken) -> usize {
match n.kind() {
IDENT | INT_NUMBER => 3,
T!['('] | T![')'] => 2,
kind if kind.is_trivia() => 0,
_ => 1,
}
}
}
#[cfg(test)]
mod tests {
use expect_test::{expect, Expect};