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//! This module contains an import search funcionality that is provided to the ra_assists module.
//! Later, this should be moved away to a separate crate that is accessible from the ra_assists module.
use hir::{Crate, MacroDef, ModuleDef, Semantics};
use ra_prof::profile;
use ra_syntax::{ast, AstNode, SyntaxKind::NAME};
use crate::{
defs::{classify_name, Definition},
symbol_index::{self, FileSymbol, Query},
RootDatabase,
};
use either::Either;
use rustc_hash::FxHashSet;
pub struct ImportsLocator<'a> {
sema: Semantics<'a, RootDatabase>,
krate: Crate,
}
impl<'a> ImportsLocator<'a> {
pub fn new(db: &'a RootDatabase, krate: Crate) -> Self {
Self { sema: Semantics::new(db), krate }
}
pub fn find_imports(&mut self, name_to_import: &str) -> Vec<Either<ModuleDef, MacroDef>> {
let _p = profile("search_for_imports");
let db = self.sema.db;
// Query dependencies first.
let mut candidates: FxHashSet<_> =
self.krate.query_external_importables(db, name_to_import).collect();
// Query the local crate using the symbol index.
let local_results = {
let mut query = Query::new(name_to_import.to_string());
query.exact();
query.limit(40);
symbol_index::crate_symbols(db, self.krate.into(), query)
};
candidates.extend(
local_results
.into_iter()
.filter_map(|import_candidate| self.get_name_definition(&import_candidate))
.filter_map(|name_definition_to_import| match name_definition_to_import {
Definition::ModuleDef(module_def) => Some(Either::Left(module_def)),
Definition::Macro(macro_def) => Some(Either::Right(macro_def)),
_ => None,
}),
);
candidates.into_iter().collect()
}
fn get_name_definition(&mut self, import_candidate: &FileSymbol) -> Option<Definition> {
let _p = profile("get_name_definition");
let file_id = import_candidate.file_id;
let candidate_node = import_candidate.ptr.to_node(self.sema.parse(file_id).syntax());
let candidate_name_node = if candidate_node.kind() != NAME {
candidate_node.children().find(|it| it.kind() == NAME)?
} else {
candidate_node
};
let name = ast::Name::cast(candidate_name_node)?;
classify_name(&self.sema, &name)?.into_definition()
}
}
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