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//! This module contains an import search functionality that is provided to the assists module.
//! Later, this should be moved away to a separate crate that is accessible from the assists module.
use hir::{
import_map::{self, ImportKind},
AsAssocItem, Crate, MacroDef, ModuleDef, Semantics,
};
use syntax::{ast, AstNode, SyntaxKind::NAME};
use crate::{
defs::{Definition, NameClass},
symbol_index::{self, FileSymbol},
RootDatabase,
};
use either::Either;
use rustc_hash::FxHashSet;
pub(crate) const DEFAULT_QUERY_SEARCH_LIMIT: usize = 40;
pub fn find_exact_imports<'a>(
sema: &Semantics<'a, RootDatabase>,
krate: Crate,
name_to_import: String,
) -> Box<dyn Iterator<Item = Either<ModuleDef, MacroDef>>> {
let _p = profile::span("find_exact_imports");
Box::new(find_imports(
sema,
krate,
{
let mut local_query = symbol_index::Query::new(name_to_import.clone());
local_query.exact();
local_query.limit(DEFAULT_QUERY_SEARCH_LIMIT);
local_query
},
import_map::Query::new(name_to_import)
.limit(DEFAULT_QUERY_SEARCH_LIMIT)
.name_only()
.search_mode(import_map::SearchMode::Equals)
.case_sensitive(),
))
}
#[derive(Debug)]
pub enum AssocItemSearch {
Include,
Exclude,
AssocItemsOnly,
}
pub fn find_similar_imports<'a>(
sema: &Semantics<'a, RootDatabase>,
krate: Crate,
fuzzy_search_string: String,
assoc_item_search: AssocItemSearch,
limit: Option<usize>,
) -> Box<dyn Iterator<Item = Either<ModuleDef, MacroDef>> + 'a> {
let _p = profile::span("find_similar_imports");
let mut external_query = import_map::Query::new(fuzzy_search_string.clone())
.search_mode(import_map::SearchMode::Fuzzy)
.name_only();
match assoc_item_search {
AssocItemSearch::Include => {}
AssocItemSearch::Exclude => {
external_query = external_query.exclude_import_kind(ImportKind::AssociatedItem);
}
AssocItemSearch::AssocItemsOnly => {
external_query = external_query.assoc_items_only();
}
}
let mut local_query = symbol_index::Query::new(fuzzy_search_string);
if let Some(limit) = limit {
external_query = external_query.limit(limit);
local_query.limit(limit);
}
let db = sema.db;
Box::new(find_imports(sema, krate, local_query, external_query).filter(
move |import_candidate| match assoc_item_search {
AssocItemSearch::Include => true,
AssocItemSearch::Exclude => !is_assoc_item(import_candidate, db),
AssocItemSearch::AssocItemsOnly => is_assoc_item(import_candidate, db),
},
))
}
fn is_assoc_item(import_candidate: &Either<ModuleDef, MacroDef>, db: &RootDatabase) -> bool {
match import_candidate {
Either::Left(ModuleDef::Function(function)) => function.as_assoc_item(db).is_some(),
Either::Left(ModuleDef::Const(const_)) => const_.as_assoc_item(db).is_some(),
Either::Left(ModuleDef::TypeAlias(type_alias)) => type_alias.as_assoc_item(db).is_some(),
_ => false,
}
}
fn find_imports<'a>(
sema: &Semantics<'a, RootDatabase>,
krate: Crate,
local_query: symbol_index::Query,
external_query: import_map::Query,
) -> impl Iterator<Item = Either<ModuleDef, MacroDef>> {
let _p = profile::span("find_similar_imports");
let db = sema.db;
// Query dependencies first.
let mut candidates: FxHashSet<_> =
krate.query_external_importables(db, external_query).collect();
// Query the local crate using the symbol index.
let local_results = symbol_index::crate_symbols(db, krate.into(), local_query);
candidates.extend(
local_results
.into_iter()
.filter_map(|import_candidate| get_name_definition(sema, &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()
}
fn get_name_definition<'a>(
sema: &Semantics<'a, RootDatabase>,
import_candidate: &FileSymbol,
) -> Option<Definition> {
let _p = profile::span("get_name_definition");
let file_id = import_candidate.file_id;
let candidate_node = import_candidate.ptr.to_node(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)?;
NameClass::classify(sema, &name)?.defined(sema.db)
}
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