smol_str to a crate

crates/libeditor/Cargo.toml

@@ -9,4 +9,5 @@ itertools = "0.7.8"
 superslice = "0.1.0"
 
 libsyntax2 = { path = "../libsyntax2" }
+smol_str = { path = "../smol_str" }
 assert_eq_text = { path = "../assert_eq_text" }

crates/libeditor/src/lib.rs

@@ -1,6 +1,7 @@
 extern crate libsyntax2;
 extern crate superslice;
 extern crate itertools;
+extern crate smol_str;
 
 mod extend_selection;
 mod symbols;

crates/libeditor/src/symbols.rs

@@ -1,3 +1,4 @@
+use smol_str::SmolStr;
 use libsyntax2::{
     SyntaxKind, SyntaxNodeRef, SyntaxRoot, AstNode,
     ast::{self, NameOwner},
@@ -11,7 +12,7 @@ use TextRange;
 #[derive(Debug)]
 pub struct FileSymbol {
     pub parent: Option<usize>,
-    pub name: String,
+    pub name: SmolStr,
     pub name_range: TextRange,
     pub node_range: TextRange,
     pub kind: SyntaxKind,

crates/libsyntax2/Cargo.toml

@@ -10,6 +10,7 @@ text_unit = "0.1.2"
 itertools = "0.7.5"
 drop_bomb = "0.1.4"
 parking_lot = "0.6.0"
+smol_str = { path = "../smol_str" }
 
 [dev-dependencies]
 assert_eq_text = { path = "../assert_eq_text" }

crates/libsyntax2/src/ast/mod.rs

@@ -1,6 +1,9 @@
 mod generated;
 
 use std::sync::Arc;
+
+use smol_str::SmolStr;
+
 use {
     SyntaxNode, SyntaxRoot, TreeRoot, SyntaxError,
     SyntaxKind::*,
@@ -64,7 +67,9 @@ impl<R: TreeRoot> Function<R> {
 }
 
 impl<R: TreeRoot> Name<R> {
-    pub fn text(&self) -> String {
-        self.syntax().text()
+    pub fn text(&self) -> SmolStr {
+        let ident = self.syntax().first_child()
+            .unwrap();
+        ident.leaf_text().unwrap()
     }
 }

crates/libsyntax2/src/lib.rs

@@ -21,10 +21,11 @@
 //#![warn(unreachable_pub)] // rust-lang/rust#47816
 
 extern crate itertools;
-extern crate text_unit;
 extern crate unicode_xid;
 extern crate drop_bomb;
 extern crate parking_lot;
+extern crate smol_str;
+extern crate text_unit;
 
 pub mod algo;
 pub mod ast;
@@ -35,7 +36,6 @@ mod grammar;
 mod parser_impl;
 
 mod syntax_kinds;
-mod smol_str;
 mod yellow;
 /// Utilities for simple uses of the parser.
 pub mod utils;

crates/libsyntax2/src/yellow/green.rs

@@ -1,8 +1,8 @@
 use std::sync::Arc;
-use {
-    SyntaxKind, TextUnit,
-    smol_str::SmolStr,
-};
+
+use smol_str::SmolStr;
+
+use {SyntaxKind, TextUnit};
 
 #[derive(Clone, Debug)]
 pub(crate) enum GreenNode {
@@ -31,7 +31,7 @@ impl GreenNode {
 
     pub fn text_len(&self) -> TextUnit {
         match self {
-            GreenNode::Leaf { text, ..} => TextUnit::of_str(text.as_str()),
+            GreenNode::Leaf { text, .. } => TextUnit::of_str(text.as_str()),
             GreenNode::Branch(b) => b.text_len(),
         }
     }
@@ -54,6 +54,13 @@ impl GreenNode {
             }
         }
     }
+
+    pub fn leaf_text(&self) -> Option<SmolStr> {
+        match self {
+            GreenNode::Leaf { text, .. } => Some(text.clone()),
+            GreenNode::Branch(_) => None,
+        }
+    }
 }
 
 #[derive(Clone, Debug)]

crates/libsyntax2/src/yellow/syntax.rs

@@ -1,5 +1,7 @@
 use std::{fmt, sync::Arc};
 
+use smol_str::SmolStr;
+
 use {
     yellow::{RedNode, TreeRoot, SyntaxRoot, RedPtr},
     SyntaxKind::{self, *},
@@ -116,6 +118,10 @@ impl<R: TreeRoot> SyntaxNode<R> {
         self.first_child().is_none()
     }
 
+    pub fn leaf_text(&self) -> Option<SmolStr> {
+        self.red().green().leaf_text()
+    }
+
     fn red(&self) -> &RedNode {
         unsafe { self.red.get(&self.root) }
     }

crates/server/src/main_loop/handlers.rs

@@ -50,9 +50,10 @@ pub fn handle_document_symbol(
     let mut res: Vec<DocumentSymbol> = Vec::new();
 
     for symbol in libeditor::file_symbols(&file) {
+        let name = symbol.name.to_string();
         let doc_symbol = DocumentSymbol {
-            name: symbol.name.clone(),
-            detail: Some(symbol.name),
+            name: name.clone(),
+            detail: Some(name),
             kind: symbol.kind.conv(),
             deprecated: None,
             range: symbol.node_range.conv_with(&line_index),

crates/smol_str/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "smol_str"
+version = "0.1.0"
+authors = ["Aleksey Kladov <aleksey.kladov@gmail.com>"]
+
+[dependencies]

crates/smol_str/src/lib.rs

@@ -1,10 +1,59 @@
-use std::{sync::Arc};
+use std::{sync::Arc, ops::Deref};
+
+#[derive(Clone, Debug)]
+pub struct SmolStr(Repr);
+
+impl SmolStr {
+    pub fn new(text: &str) -> SmolStr {
+        SmolStr(Repr::new(text))
+    }
+
+    pub fn as_str(&self) -> &str {
+        self.0.as_str()
+    }
+
+    pub fn to_string(&self) -> String {
+        self.as_str().to_string()
+    }
+}
+
+impl Deref for SmolStr {
+    type Target = str;
+
+    fn deref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl PartialEq<str> for SmolStr {
+    fn eq(&self, other: &str) -> bool {
+        self.as_str() == other
+    }
+}
+
+impl PartialEq<SmolStr> for str {
+    fn eq(&self, other: &SmolStr) -> bool {
+        other == self
+    }
+}
+
+impl<'a> PartialEq<&'a str> for SmolStr {
+    fn eq(&self, other: &&'a str) -> bool {
+        self == *other
+    }
+}
+
+impl<'a> PartialEq<SmolStr> for &'a str {
+    fn eq(&self, other: &SmolStr) -> bool {
+        *self == other
+    }
+}
 
 const INLINE_CAP: usize = 22;
 const WS_TAG: u8 = (INLINE_CAP + 1) as u8;
 
 #[derive(Clone, Debug)]
-pub(crate) enum SmolStr {
+enum Repr {
     Heap(Arc<str>),
     Inline {
         len: u8,
@@ -12,13 +61,13 @@ pub(crate) enum SmolStr {
     },
 }
 
-impl SmolStr {
-    pub fn new(text: &str) -> SmolStr {
+impl Repr {
+    fn new(text: &str) -> Repr {
         let len = text.len();
         if len <= INLINE_CAP {
             let mut buf = [0; INLINE_CAP];
             buf[..len].copy_from_slice(text.as_bytes());
-            return SmolStr::Inline { len: len as u8, buf };
+            return Repr::Inline { len: len as u8, buf };
         }
 
         let newlines = text.bytes().take_while(|&b| b == b'\n').count();
@@ -27,23 +76,23 @@ impl SmolStr {
             let mut buf = [0; INLINE_CAP];
             buf[0] = newlines as u8;
             buf[1] = spaces as u8;
-            return SmolStr::Inline { len: WS_TAG, buf };
+            return Repr::Inline { len: WS_TAG, buf };
         }
 
-        SmolStr::Heap(
+        Repr::Heap(
             text.to_string().into_boxed_str().into()
         )
     }
 
-    pub fn as_str(&self) -> &str {
+    fn as_str(&self) -> &str {
         match self {
-            SmolStr::Heap(data) => &*data,
-            SmolStr::Inline { len, buf } => {
+            Repr::Heap(data) => &*data,
+            Repr::Inline { len, buf } => {
                 if *len == WS_TAG {
                     let newlines = buf[0] as usize;
                     let spaces = buf[1] as usize;
                     assert!(newlines <= N_NEWLINES && spaces <= N_SPACES);
-                    return &WS[N_NEWLINES - newlines..N_NEWLINES + spaces]
+                    return &WS[N_NEWLINES - newlines..N_NEWLINES + spaces];
                 }
 
                 let len = *len as usize;