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use libsyntax2::{
AstNode, SyntaxNode, SyntaxNodeRef, SmolStr, ast
};
pub struct ModuleScope {
entries: Vec<Entry>,
}
pub struct Entry {
node: SyntaxNode,
kind: EntryKind,
}
enum EntryKind {
Item, Import,
}
impl ModuleScope {
pub fn new(m: ast::Root) -> ModuleScope {
let mut entries = Vec::new();
for item in m.items() {
let entry = match item {
ast::ModuleItem::StructDef(item) => Entry::new(item),
ast::ModuleItem::EnumDef(item) => Entry::new(item),
ast::ModuleItem::FnDef(item) => Entry::new(item),
ast::ModuleItem::ConstDef(item) => Entry::new(item),
ast::ModuleItem::StaticDef(item) => Entry::new(item),
ast::ModuleItem::TraitDef(item) => Entry::new(item),
ast::ModuleItem::TypeDef(item) => Entry::new(item),
ast::ModuleItem::Module(item) => Entry::new(item),
ast::ModuleItem::UseItem(item) => {
if let Some(tree) = item.use_tree() {
collect_imports(tree, &mut entries);
}
continue;
},
ast::ModuleItem::ExternCrateItem(_) |
ast::ModuleItem::ImplItem(_) => continue,
};
entries.extend(entry)
}
ModuleScope { entries }
}
pub fn entries(&self) -> &[Entry] {
self.entries.as_slice()
}
}
impl Entry {
fn new<'a>(item: impl ast::NameOwner<'a>) -> Option<Entry> {
let name = item.name()?;
Some(Entry { node: name.syntax().owned(), kind: EntryKind::Item })
}
fn new_import(path: ast::Path) -> Option<Entry> {
let name_ref = path.segment()?.name_ref()?;
Some(Entry { node: name_ref.syntax().owned(), kind: EntryKind::Import })
}
pub fn name(&self) -> SmolStr {
match self.kind {
EntryKind::Item =>
ast::Name::cast(self.node.borrowed()).unwrap()
.text(),
EntryKind::Import =>
ast::NameRef::cast(self.node.borrowed()).unwrap()
.text(),
}
}
pub fn syntax(&self) -> SyntaxNodeRef {
self.node.borrowed()
}
}
fn collect_imports(tree: ast::UseTree, acc: &mut Vec<Entry>) {
if let Some(use_tree_list) = tree.use_tree_list() {
return use_tree_list.use_trees().for_each(|it| collect_imports(it, acc));
}
if let Some(path) = tree.path() {
acc.extend(Entry::new_import(path));
}
}
#[cfg(test)]
mod tests {
use super::*;
use libsyntax2::File;
fn do_check(code: &str, expected: &[&str]) {
let file = File::parse(&code);
let scope = ModuleScope::new(file.ast());
let actual = scope.entries
.iter()
.map(|it| it.name())
.collect::<Vec<_>>();
assert_eq!(expected, actual.as_slice());
}
#[test]
fn test_module_scope() {
do_check("
struct Foo;
enum Bar {}
mod baz {}
fn quux() {}
use x::{
y::z,
t,
};
type T = ();
", &["Foo", "Bar", "baz", "quux", "z", "t", "T"])
}
}
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