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|
//! Completes mod declarations.
use base_db::{SourceDatabaseExt, VfsPath};
use hir::{Module, ModuleSource};
use ide_db::RootDatabase;
use rustc_hash::FxHashSet;
use crate::{CompletionItem, CompletionItemKind};
use super::{
completion_context::CompletionContext, completion_item::CompletionKind,
completion_item::Completions,
};
/// Complete mod declaration, i.e. `mod <|> ;`
pub(super) fn complete_mod(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
let mod_under_caret = match &ctx.mod_under_caret {
Some(mod_under_caret) if mod_under_caret.item_list().is_some() => return None,
Some(mod_under_caret) => mod_under_caret,
None => return None,
};
let _p = profile::span("completion::complete_mod");
let current_module = ctx.scope.module()?;
let module_definition_file =
current_module.definition_source(ctx.db).file_id.original_file(ctx.db);
let source_root = ctx.db.source_root(ctx.db.file_source_root(module_definition_file));
let directory_to_look_for_submodules = directory_to_look_for_submodules(
current_module,
ctx.db,
source_root.path_for_file(&module_definition_file)?,
)?;
let existing_mod_declarations = current_module
.children(ctx.db)
.filter_map(|module| Some(module.name(ctx.db)?.to_string()))
.collect::<FxHashSet<_>>();
let module_declaration_file =
current_module.declaration_source(ctx.db).map(|module_declaration_source_file| {
module_declaration_source_file.file_id.original_file(ctx.db)
});
source_root
.iter()
.filter(|submodule_candidate_file| submodule_candidate_file != &module_definition_file)
.filter(|submodule_candidate_file| {
Some(submodule_candidate_file) != module_declaration_file.as_ref()
})
.filter_map(|submodule_file| {
let submodule_path = source_root.path_for_file(&submodule_file)?;
if !is_special_rust_file_path(&submodule_path)
&& submodule_path.parent()? == directory_to_look_for_submodules
{
submodule_path.file_name_and_extension()
} else {
None
}
})
.filter_map(|submodule_file_name_and_extension| match submodule_file_name_and_extension {
(file_name, Some("rs")) => Some(file_name.to_owned()),
(subdirectory_name, None) => {
let mod_rs_path =
directory_to_look_for_submodules.join(subdirectory_name)?.join("mod.rs")?;
if source_root.file_for_path(&mod_rs_path).is_some() {
Some(subdirectory_name.to_owned())
} else {
None
}
}
_ => None,
})
.filter(|name| !existing_mod_declarations.contains(name))
.for_each(|submodule_name| {
let mut label = submodule_name;
if mod_under_caret.semicolon_token().is_none() {
label.push(';')
}
acc.add(
CompletionItem::new(CompletionKind::Magic, ctx.source_range(), &label)
.kind(CompletionItemKind::Module),
)
});
Some(())
}
fn is_special_rust_file_path(path: &VfsPath) -> bool {
matches!(
path.file_name_and_extension(),
Some(("mod", Some("rs"))) | Some(("lib", Some("rs"))) | Some(("main", Some("rs")))
)
}
fn directory_to_look_for_submodules(
module: Module,
db: &RootDatabase,
module_file_path: &VfsPath,
) -> Option<VfsPath> {
let module_directory_path = module_file_path.parent()?;
let base_directory = if is_special_rust_file_path(module_file_path) {
Some(module_directory_path)
} else if let (regular_rust_file_name, Some("rs")) =
module_file_path.file_name_and_extension()?
{
if matches!(
(
module_directory_path
.parent()
.as_ref()
.and_then(|path| path.file_name_and_extension()),
module_directory_path.file_name_and_extension(),
),
(Some(("src", None)), Some(("bin", None)))
) {
// files in /src/bin/ can import each other directly
Some(module_directory_path)
} else {
module_directory_path.join(regular_rust_file_name)
}
} else {
None
}?;
let mut resulting_path = base_directory;
for module in module_chain_to_containing_module_file(module, db) {
if let Some(name) = module.name(db) {
resulting_path = resulting_path.join(&name.to_string())?;
}
}
Some(resulting_path)
}
fn module_chain_to_containing_module_file(
current_module: Module,
db: &RootDatabase,
) -> Vec<Module> {
let mut path = Vec::new();
let mut current_module = Some(current_module);
while let Some(ModuleSource::Module(_)) =
current_module.map(|module| module.definition_source(db).value)
{
if let Some(module) = current_module {
path.insert(0, module);
current_module = module.parent(db);
} else {
current_module = None;
}
}
path
}
|
