From 80ab3433d3376b7c44787d63af6e7b3217ae41d8 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 30 Aug 2018 20:37:33 +0300
Subject: complete imports

---
 crates/libeditor/src/scope/mod_scope.rs | 88 +++++++++++++++++++++++++++------
 1 file changed, 74 insertions(+), 14 deletions(-)

(limited to 'crates/libeditor')

diff --git a/crates/libeditor/src/scope/mod_scope.rs b/crates/libeditor/src/scope/mod_scope.rs
index aa8dd93a7..25faee3b8 100644
--- a/crates/libeditor/src/scope/mod_scope.rs
+++ b/crates/libeditor/src/scope/mod_scope.rs
@@ -6,21 +6,38 @@ 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 entries = m.items().filter_map(|item| {
-            match item {
+        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::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(_) |
-                ast::ModuleItem::UseItem(_) => None
-            }
-        }).collect();
+                ast::ModuleItem::ImplItem(_) => continue,
+            };
+            entries.extend(entry)
+        }
 
         ModuleScope { entries }
     }
@@ -30,20 +47,63 @@ impl ModuleScope {
     }
 }
 
-pub struct Entry {
-    name: SyntaxNode,
-}
-
 impl Entry {
     fn new<'a>(item: impl ast::NameOwner<'a>) -> Option<Entry> {
         let name = item.name()?;
-        Some(Entry { name: name.syntax().owned() })
+        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 {
-        self.ast().text()
+        match self.kind {
+            EntryKind::Item =>
+                ast::Name::cast(self.node.borrowed()).unwrap()
+                    .text(),
+            EntryKind::Import =>
+                ast::NameRef::cast(self.node.borrowed()).unwrap()
+                    .text(),
+        }
     }
-    fn ast(&self) -> ast::Name {
-        ast::Name::cast(self.name.borrowed()).unwrap()
+}
+
+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,
+            };
+        ", &["Foo", "Bar", "baz", "quux", "z", "t"])
+    }
+}
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