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//! This module has the functionality to search the project and its dependencies for a certain item,
//! by its name and a few criteria.
//! The main reason for this module to exist is the fact that project's items and dependencies' items
//! are located in different caches, with different APIs.
use either::Either;
use hir::{
import_map::{self, ImportKind},
AsAssocItem, Crate, ItemInNs, ModuleDef, Semantics,
};
use syntax::{ast, AstNode, SyntaxKind::NAME};
use crate::{
defs::{Definition, NameClass},
helpers::import_assets::NameToImport,
symbol_index::{self, FileSymbol},
RootDatabase,
};
/// A value to use, when uncertain which limit to pick.
pub const DEFAULT_QUERY_SEARCH_LIMIT: usize = 40;
/// Three possible ways to search for the name in associated and/or other items.
#[derive(Debug, Clone, Copy)]
pub enum AssocItemSearch {
/// Search for the name in both associated and other items.
Include,
/// Search for the name in other items only.
Exclude,
/// Search for the name in the associated items only.
AssocItemsOnly,
}
/// Searches for importable items with the given name in the crate and its dependencies.
pub fn items_with_name<'a>(
sema: &'a Semantics<'_, RootDatabase>,
krate: Crate,
name: NameToImport,
assoc_item_search: AssocItemSearch,
limit: Option<usize>,
) -> impl Iterator<Item = ItemInNs> + 'a {
let _p = profile::span("items_with_name").detail(|| {
format!(
"Name: {}, crate: {:?}, assoc items: {:?}, limit: {:?}",
name.text(),
assoc_item_search,
krate.display_name(sema.db).map(|name| name.to_string()),
limit,
)
});
let (mut local_query, mut external_query) = match name {
NameToImport::Exact(exact_name) => {
let mut local_query = symbol_index::Query::new(exact_name.clone());
local_query.exact();
let external_query = import_map::Query::new(exact_name)
.name_only()
.search_mode(import_map::SearchMode::Equals)
.case_sensitive();
(local_query, external_query)
}
NameToImport::Fuzzy(fuzzy_search_string) => {
let mut local_query = symbol_index::Query::new(fuzzy_search_string.clone());
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();
}
}
if fuzzy_search_string.to_lowercase() != fuzzy_search_string {
local_query.case_sensitive();
external_query = external_query.case_sensitive();
}
(local_query, external_query)
}
};
if let Some(limit) = limit {
external_query = external_query.limit(limit);
local_query.limit(limit);
}
find_items(sema, krate, assoc_item_search, local_query, external_query)
}
fn find_items<'a>(
sema: &'a Semantics<'_, RootDatabase>,
krate: Crate,
assoc_item_search: AssocItemSearch,
local_query: symbol_index::Query,
external_query: import_map::Query,
) -> impl Iterator<Item = ItemInNs> + 'a {
let _p = profile::span("find_items");
let db = sema.db;
let external_importables =
krate.query_external_importables(db, external_query).map(|external_importable| {
match external_importable {
Either::Left(module_def) => ItemInNs::from(module_def),
Either::Right(macro_def) => ItemInNs::from(macro_def),
}
});
// Query the local crate using the symbol index.
let local_results = symbol_index::crate_symbols(db, krate.into(), local_query)
.into_iter()
.filter_map(move |local_candidate| get_name_definition(sema, &local_candidate))
.filter_map(|name_definition_to_import| match name_definition_to_import {
Definition::ModuleDef(module_def) => Some(ItemInNs::from(module_def)),
Definition::Macro(macro_def) => Some(ItemInNs::from(macro_def)),
_ => None,
});
external_importables.chain(local_results).filter(move |&item| match assoc_item_search {
AssocItemSearch::Include => true,
AssocItemSearch::Exclude => !is_assoc_item(item, sema.db),
AssocItemSearch::AssocItemsOnly => is_assoc_item(item, sema.db),
})
}
fn get_name_definition(
sema: &Semantics<'_, 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)
}
fn is_assoc_item(item: ItemInNs, db: &RootDatabase) -> bool {
item.as_module_def_id()
.and_then(|module_def_id| ModuleDef::from(module_def_id).as_assoc_item(db))
.is_some()
}
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