From b5021411a84822cb3f1e3aeffad9550dd15bdeb6 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 16 Sep 2018 12:54:24 +0300
Subject: rename all things

---
 crates/ra_editor/src/scope/mod_scope.rs | 115 ++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 crates/ra_editor/src/scope/mod_scope.rs

(limited to 'crates/ra_editor/src/scope/mod_scope.rs')

diff --git a/crates/ra_editor/src/scope/mod_scope.rs b/crates/ra_editor/src/scope/mod_scope.rs
new file mode 100644
index 000000000..d2a3e7c58
--- /dev/null
+++ b/crates/ra_editor/src/scope/mod_scope.rs
@@ -0,0 +1,115 @@
+use ra_syntax::{
+    AstNode, SyntaxNode, SyntaxNodeRef, SmolStr,
+    ast::{self, AstChildren},
+};
+
+pub struct ModuleScope {
+    entries: Vec<Entry>,
+}
+
+pub struct Entry {
+    node: SyntaxNode,
+    kind: EntryKind,
+}
+
+enum EntryKind {
+    Item, Import,
+}
+
+impl ModuleScope {
+    pub fn new(items: AstChildren<ast::ModuleItem>) -> ModuleScope {
+        let mut entries = Vec::new();
+        for item in 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 ra_syntax::{File, ast::ModuleItemOwner};
+
+    fn do_check(code: &str, expected: &[&str]) {
+        let file = File::parse(&code);
+        let scope = ModuleScope::new(file.ast().items());
+        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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