From 80366e90f5c1b809c8902e42dced42c0dc9d92ac Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 5 Aug 2018 19:06:14 +0300
Subject: File symnols

---
 libeditor/src/lib.rs | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

(limited to 'libeditor/src')

diff --git a/libeditor/src/lib.rs b/libeditor/src/lib.rs
index 119bdb2d6..091aed125 100644
--- a/libeditor/src/lib.rs
+++ b/libeditor/src/lib.rs
@@ -2,6 +2,7 @@ extern crate libsyntax2;
 extern crate text_unit;
 
 use libsyntax2::{
+    SyntaxNodeRef,
     algo::walk,
     SyntaxKind::*,
 };
@@ -16,6 +17,13 @@ pub struct HighlightedRange {
     pub tag: &'static str,
 }
 
+#[derive(Debug)]
+pub struct Symbol {
+    // pub parent: ???,
+    pub name: String,
+    pub range: TextRange,
+}
+
 impl File {
     pub fn new(text: &str) -> File {
         File {
@@ -41,7 +49,7 @@ impl File {
             };
             res.push(HighlightedRange {
                 range: node.range(),
-                tag
+                tag,
             })
         }
         res
@@ -50,4 +58,41 @@ impl File {
     pub fn syntax_tree(&self) -> String {
         ::libsyntax2::utils::dump_tree(&self.inner.syntax())
     }
+
+    pub fn symbols(&self) -> Vec<Symbol> {
+        let syntax = self.inner.syntax();
+        let res: Vec<Symbol> = walk::preorder(syntax.as_ref())
+            .filter_map(Declaration::cast)
+            .filter_map(|decl| {
+                let name = decl.name()?;
+                let range = decl.range();
+                Some(Symbol { name, range })
+            })
+            .collect();
+        res // NLL :-(
+    }
+}
+
+
+struct Declaration<'f>(SyntaxNodeRef<'f>);
+
+impl<'f> Declaration<'f> {
+    fn cast(node: SyntaxNodeRef<'f>) -> Option<Declaration<'f>> {
+        match node.kind() {
+            | STRUCT_ITEM | ENUM_ITEM | FN_ITEM | TRAIT_ITEM
+            | CONST_ITEM | STATIC_ITEM | MOD_ITEM | NAMED_FIELD
+            | TYPE_ITEM => Some(Declaration(node)),
+            _ => None
+        }
+    }
+
+    fn name(&self) -> Option<String> {
+        let name = self.0.children()
+            .find(|child| child.kind() == NAME)?;
+        Some(name.text())
+    }
+
+    fn range(&self) -> TextRange {
+        self.0.range()
+    }
 }
-- 
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