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Factor out token ranking

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This commit is contained in:
Lukas Wirth 2024-10-25 12:02:48 +02:00
parent 52a03ec237
commit ca3699bd50
4 changed files with 37 additions and 36 deletions
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30
crates/ide-db/src/lib.rs
View file

@ -293,3 +293,33 @@ impl SnippetCap {
}
}
}
pub struct Ranker<'a> {
pub kind: parser::SyntaxKind,
pub text: &'a str,
pub ident_kind: bool,
}
impl<'a> Ranker<'a> {
pub fn from_token(token: &'a syntax::SyntaxToken) -> Self {
let kind = token.kind();
Ranker { kind, text: token.text(), ident_kind: kind.is_any_identifier() }
}
/// A utility function that ranks a token again a given kind and text, returning a number that
/// represents how close the token is to the given kind and text.
pub fn rank_token(&self, tok: &syntax::SyntaxToken) -> usize {
let tok_kind = tok.kind();
let exact_same_kind = tok_kind == self.kind;
let both_idents = exact_same_kind || (tok_kind.is_any_identifier() && self.ident_kind);
let same_text = tok.text() == self.text;
// anything that mapped into a token tree has likely no semantic information
let no_tt_parent =
tok.parent().map_or(false, |it| it.kind() != parser::SyntaxKind::TOKEN_TREE);
!((both_idents as usize)
| ((exact_same_kind as usize) << 1)
| ((same_text as usize) << 2)
| ((no_tt_parent as usize) << 3))
}
}

22
crates/ide/src/hover.rs
View file

@ -11,7 +11,7 @@ use ide_db::{
defs::{Definition, IdentClass, NameRefClass, OperatorClass},
famous_defs::FamousDefs,
helpers::pick_best_token,
FileRange, FxIndexSet, RootDatabase,
FileRange, FxIndexSet, Ranker, RootDatabase,
};
use itertools::{multizip, Itertools};
use span::Edition;
@ -182,27 +182,13 @@ fn hover_offset(
// equivalency is more important
let mut descended = sema.descend_into_macros(original_token.clone());
let kind = original_token.kind();
let text = original_token.text();
let ident_kind = kind.is_any_identifier();
let ranker = Ranker::from_token(&original_token);
descended.sort_by_cached_key(|tok| {
let tok_kind = tok.kind();
let exact_same_kind = tok_kind == kind;
let both_idents = exact_same_kind || (tok_kind.is_any_identifier() && ident_kind);
let same_text = tok.text() == text;
// anything that mapped into a token tree has likely no semantic information
let no_tt_parent = tok.parent().map_or(false, |it| it.kind() != TOKEN_TREE);
!((both_idents as usize)
| ((exact_same_kind as usize) << 1)
| ((same_text as usize) << 2)
| ((no_tt_parent as usize) << 3))
});
descended.sort_by_cached_key(|tok| ranker.rank_token(tok));
let mut res = vec![];
for token in descended {
let is_same_kind = token.kind() == kind;
let is_same_kind = token.kind() == ranker.kind;
let lint_hover = (|| {
// FIXME: Definition should include known lints and the like instead of having this special case here
let attr = token.parent_ancestors().find_map(ast::Attr::cast)?;

20
crates/ide/src/syntax_highlighting.rs
View file

@ -16,7 +16,7 @@ mod tests;
use std::ops::ControlFlow;
use hir::{InRealFile, Name, Semantics};
use ide_db::{FxHashMap, RootDatabase, SymbolKind};
use ide_db::{FxHashMap, Ranker, RootDatabase, SymbolKind};
use span::EditionedFileId;
use syntax::{
ast::{self, IsString},
@ -401,9 +401,7 @@ fn traverse(
// Attempt to descend tokens into macro-calls.
let res = match element {
NodeOrToken::Token(token) if token.kind() != COMMENT => {
let kind = token.kind();
let text = token.text();
let ident_kind = kind.is_any_identifier();
let ranker = Ranker::from_token(&token);
let mut t = None;
let mut r = 0;
@ -412,19 +410,7 @@ fn traverse(
|tok, _ctx| {
// FIXME: Consider checking ctx transparency for being opaque?
let tok = tok.value;
let tok_kind = tok.kind();
let exact_same_kind = tok_kind == kind;
let both_idents =
exact_same_kind || (tok_kind.is_any_identifier() && ident_kind);
let same_text = tok.text() == text;
// anything that mapped into a token tree has likely no semantic information
let no_tt_parent =
tok.parent().map_or(false, |it| it.kind() != TOKEN_TREE);
let my_rank = (both_idents as usize)
| ((exact_same_kind as usize) << 1)
| ((same_text as usize) << 2)
| ((no_tt_parent as usize) << 3);
let my_rank = ranker.rank_token(&tok);
if my_rank > 0b1110 {
// a rank of 0b1110 means that we have found a maximally interesting

1
rust-bors.toml
View file

@ -1 +0,0 @@
timeout = 3600