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use ra_db::{Cancelable, SourceRootId, FileId};
use ra_syntax::{ast, SyntaxNode, AstNode, TreeArc};
use crate::{
Module, ModuleSource, Problem,
Crate, DefId, DefLoc, DefKind, Name, Path, PathKind, PerNs, Def,
module_tree::ModuleId,
nameres::ModuleScope,
db::HirDatabase,
};
impl Module {
pub(crate) fn new(def_id: DefId) -> Self {
crate::code_model_api::Module { def_id }
}
pub(crate) fn from_module_id(
db: &impl HirDatabase,
source_root_id: SourceRootId,
module_id: ModuleId,
) -> Self {
let module_tree = db.module_tree(source_root_id);
let def_loc = DefLoc {
kind: DefKind::Module,
source_root_id,
module_id,
source_item_id: module_id.source(&module_tree),
};
let def_id = def_loc.id(db);
Module::new(def_id)
}
pub(crate) fn name_impl(&self, db: &impl HirDatabase) -> Option<Name> {
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
let link = loc.module_id.parent_link(&module_tree)?;
Some(link.name(&module_tree).clone())
}
pub fn definition_source_impl(&self, db: &impl HirDatabase) -> (FileId, ModuleSource) {
let loc = self.def_id.loc(db);
let file_id = loc.source_item_id.file_id.as_original_file();
let syntax_node = db.file_item(loc.source_item_id);
let module_source = if let Some(source_file) = ast::SourceFile::cast(&syntax_node) {
ModuleSource::SourceFile(source_file.to_owned())
} else {
let module = ast::Module::cast(&syntax_node).unwrap();
ModuleSource::Module(module.to_owned())
};
(file_id, module_source)
}
pub fn declaration_source_impl(
&self,
db: &impl HirDatabase,
) -> Option<(FileId, TreeArc<ast::Module>)> {
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
let link = loc.module_id.parent_link(&module_tree)?;
let file_id = link
.owner(&module_tree)
.source(&module_tree)
.file_id
.as_original_file();
let src = link.source(&module_tree, db);
Some((file_id, src))
}
pub(crate) fn krate_impl(&self, db: &impl HirDatabase) -> Option<Crate> {
let root = self.crate_root(db);
let loc = root.def_id.loc(db);
let file_id = loc.source_item_id.file_id.as_original_file();
let crate_graph = db.crate_graph();
let crate_id = crate_graph.crate_id_for_crate_root(file_id)?;
Some(Crate::new(crate_id))
}
pub(crate) fn crate_root_impl(&self, db: &impl HirDatabase) -> Module {
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
let module_id = loc.module_id.crate_root(&module_tree);
Module::from_module_id(db, loc.source_root_id, module_id)
}
/// Finds a child module with the specified name.
pub fn child_impl(&self, db: &impl HirDatabase, name: &Name) -> Option<Module> {
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
let child_id = loc.module_id.child(&module_tree, name)?;
Some(Module::from_module_id(db, loc.source_root_id, child_id))
}
/// Iterates over all child modules.
pub fn children_impl(&self, db: &impl HirDatabase) -> impl Iterator<Item = Module> {
// FIXME this should be implementable without collecting into a vec, but
// it's kind of hard since the iterator needs to keep a reference to the
// module tree.
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
let children = loc
.module_id
.children(&module_tree)
.map(|(_, module_id)| Module::from_module_id(db, loc.source_root_id, module_id))
.collect::<Vec<_>>();
children.into_iter()
}
pub fn parent_impl(&self, db: &impl HirDatabase) -> Option<Module> {
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
let parent_id = loc.module_id.parent(&module_tree)?;
Some(Module::from_module_id(db, loc.source_root_id, parent_id))
}
/// Returns a `ModuleScope`: a set of items, visible in this module.
pub fn scope_impl(&self, db: &impl HirDatabase) -> ModuleScope {
let loc = self.def_id.loc(db);
let item_map = db.item_map(loc.source_root_id);
item_map.per_module[&loc.module_id].clone()
}
pub fn resolve_path_impl(&self, db: &impl HirDatabase, path: &Path) -> PerNs<DefId> {
let mut curr_per_ns = PerNs::types(
match path.kind {
PathKind::Crate => self.crate_root(db),
PathKind::Self_ | PathKind::Plain => self.clone(),
PathKind::Super => {
if let Some(p) = self.parent(db) {
p
} else {
return PerNs::none();
}
}
}
.def_id,
);
let segments = &path.segments;
for (idx, name) in segments.iter().enumerate() {
let curr = if let Some(r) = curr_per_ns.as_ref().take_types() {
r
} else {
return PerNs::none();
};
let module = match curr.resolve(db) {
Def::Module(it) => it,
Def::Enum(e) => {
if segments.len() == idx + 1 {
// enum variant
let matching_variant =
e.variants(db).into_iter().find(|(n, _variant)| n == name);
if let Some((_n, variant)) = matching_variant {
return PerNs::both(variant.def_id(), e.def_id());
} else {
return PerNs::none();
}
} else if segments.len() == idx {
// enum
return PerNs::types(e.def_id());
} else {
// malformed enum?
return PerNs::none();
}
}
_ => return PerNs::none(),
};
let scope = module.scope(db);
curr_per_ns = if let Some(r) = scope.get(&name) {
r.def_id
} else {
return PerNs::none();
};
}
curr_per_ns
}
pub fn problems_impl(
&self,
db: &impl HirDatabase,
) -> Cancelable<Vec<(TreeArc<SyntaxNode>, Problem)>> {
let loc = self.def_id.loc(db);
let module_tree = db.module_tree(loc.source_root_id);
Ok(loc.module_id.problems(&module_tree, db))
}
}
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