Auto merge of #16384 - Veykril:smolstr, r=Veykril

minor: Make use of some new `SmolStr` improvements

crates/hir-expand/src/name.rs

@@ -2,7 +2,7 @@
 
 use std::fmt;
 
-use syntax::{ast, utils::is_raw_identifier, SmolStr};
+use syntax::{ast, format_smolstr, utils::is_raw_identifier, SmolStr};
 
 /// `Name` is a wrapper around string, which is used in hir for both references
 /// and declarations. In theory, names should also carry hygiene info, but we are
@@ -69,8 +69,8 @@ impl Name {
     }
 
     /// Shortcut to create inline plain text name. Panics if `text.len() > 22`
-    const fn new_inline(text: &str) -> Name {
-        Name::new_text(SmolStr::new_inline(text))
+    const fn new_static(text: &'static str) -> Name {
+        Name::new_text(SmolStr::new_static(text))
     }
 
     /// Resolve a name from the text of token.
@@ -83,7 +83,7 @@ impl Name {
             // Rust, e.g. "try" in Rust 2015. Even in such cases, we keep track of them in their
             // escaped form.
             None if is_raw_identifier(raw_text) => {
-                Name::new_text(SmolStr::from_iter(["r#", raw_text]))
+                Name::new_text(format_smolstr!("r#{}", raw_text))
             }
             _ => Name::new_text(raw_text.into()),
         }
@@ -99,7 +99,7 @@ impl Name {
     /// name is equal only to itself. It's not clear how to implement this in
     /// salsa though, so we punt on that bit for a moment.
     pub const fn missing() -> Name {
-        Name::new_inline("[missing name]")
+        Name::new_static("[missing name]")
     }
 
     /// Returns true if this is a fake name for things missing in the source code. See
@@ -119,7 +119,7 @@ impl Name {
         use std::sync::atomic::{AtomicUsize, Ordering};
         static CNT: AtomicUsize = AtomicUsize::new(0);
         let c = CNT.fetch_add(1, Ordering::Relaxed);
-        Name::new_text(format!("<ra@gennew>{c}").into())
+        Name::new_text(format_smolstr!("<ra@gennew>{c}"))
     }
 
     /// Returns the tuple index this name represents if it is a tuple field.
@@ -260,7 +260,7 @@ pub mod known {
             $(
                 #[allow(bad_style)]
                 pub const $ident: super::Name =
-                    super::Name::new_inline(stringify!($ident));
+                    super::Name::new_static(stringify!($ident));
             )*
         };
     }
@@ -471,11 +471,11 @@ pub mod known {
     );
 
     // self/Self cannot be used as an identifier
-    pub const SELF_PARAM: super::Name = super::Name::new_inline("self");
-    pub const SELF_TYPE: super::Name = super::Name::new_inline("Self");
+    pub const SELF_PARAM: super::Name = super::Name::new_static("self");
+    pub const SELF_TYPE: super::Name = super::Name::new_static("Self");
 
-    pub const STATIC_LIFETIME: super::Name = super::Name::new_inline("'static");
-    pub const DOLLAR_CRATE: super::Name = super::Name::new_inline("$crate");
+    pub const STATIC_LIFETIME: super::Name = super::Name::new_static("'static");
+    pub const DOLLAR_CRATE: super::Name = super::Name::new_static("$crate");
 
     #[macro_export]
     macro_rules! name {

crates/hir-expand/src/quote.rs

@@ -1,11 +1,12 @@
 //! A simplified version of quote-crate like quasi quote macro
 
 use span::Span;
+use syntax::format_smolstr;
 
 use crate::name::Name;
 
-pub(crate) fn dollar_crate(span: Span) -> tt::Ident<Span> {
-    tt::Ident { text: syntax::SmolStr::new_inline("$crate"), span }
+pub(crate) const fn dollar_crate(span: Span) -> tt::Ident<Span> {
+    tt::Ident { text: syntax::SmolStr::new_static("$crate"), span }
 }
 
 // A helper macro quote macro
@@ -214,8 +215,8 @@ impl_to_to_tokentrees! {
     _span: crate::tt::Literal => self { self };
     _span: crate::tt::Ident => self { self };
     _span: crate::tt::Punct => self { self };
-    span: &str => self { crate::tt::Literal{text: format!("\"{}\"", self.escape_default()).into(), span}};
-    span: String => self { crate::tt::Literal{text: format!("\"{}\"", self.escape_default()).into(), span}};
+    span: &str => self { crate::tt::Literal{text: format_smolstr!("\"{}\"", self.escape_default()), span}};
+    span: String => self { crate::tt::Literal{text: format_smolstr!("\"{}\"", self.escape_default()), span}};
     span: Name => self { crate::tt::Ident{text: self.to_smol_str(), span}};
 }
 

crates/hir/src/lib.rs

@@ -81,7 +81,7 @@ use rustc_hash::FxHashSet;
 use stdx::{impl_from, never};
 use syntax::{
     ast::{self, HasAttrs as _, HasName},
-    AstNode, AstPtr, SmolStr, SyntaxNode, SyntaxNodePtr, TextRange, T,
+    format_smolstr, AstNode, AstPtr, SmolStr, SyntaxNode, SyntaxNodePtr, TextRange, T,
 };
 use triomphe::Arc;
 
@@ -4284,9 +4284,9 @@ impl Type {
             .filter_map(|arg| {
                 // arg can be either a `Ty` or `constant`
                 if let Some(ty) = arg.ty(Interner) {
-                    Some(SmolStr::new(ty.display(db).to_string()))
+                    Some(format_smolstr!("{}", ty.display(db)))
                 } else if let Some(const_) = arg.constant(Interner) {
-                    Some(SmolStr::new_inline(&const_.display(db).to_string()))
+                    Some(format_smolstr!("{}", const_.display(db)))
                 } else {
                     None
                 }

crates/ide-completion/src/completions.rs

@@ -26,7 +26,7 @@ use std::iter;
 
 use hir::{known, HasAttrs, ScopeDef, Variant};
 use ide_db::{imports::import_assets::LocatedImport, RootDatabase, SymbolKind};
-use syntax::ast;
+use syntax::{ast, SmolStr};
 
 use crate::{
     context::{
@@ -80,7 +80,11 @@ impl Completions {
     }
 
     pub(crate) fn add_keyword(&mut self, ctx: &CompletionContext<'_>, keyword: &'static str) {
-        let item = CompletionItem::new(CompletionItemKind::Keyword, ctx.source_range(), keyword);
+        let item = CompletionItem::new(
+            CompletionItemKind::Keyword,
+            ctx.source_range(),
+            SmolStr::new_static(keyword),
+        );
         item.add_to(self, ctx.db);
     }
 

crates/ide-completion/src/completions/dot.rs

@@ -1,6 +1,7 @@
 //! Completes references after dot (fields and method calls).
 
 use ide_db::FxHashSet;
+use syntax::SmolStr;
 
 use crate::{
     context::{CompletionContext, DotAccess, DotAccessKind, ExprCtx, PathCompletionCtx, Qualified},
@@ -20,8 +21,11 @@ pub(crate) fn complete_dot(
 
     // Suggest .await syntax for types that implement Future trait
     if receiver_ty.impls_into_future(ctx.db) {
-        let mut item =
-            CompletionItem::new(CompletionItemKind::Keyword, ctx.source_range(), "await");
+        let mut item = CompletionItem::new(
+            CompletionItemKind::Keyword,
+            ctx.source_range(),
+            SmolStr::new_static("await"),
+        );
         item.detail("expr.await");
         item.add_to(acc, ctx.db);
     }

crates/ide-completion/src/completions/extern_abi.rs

@@ -1,7 +1,7 @@
 //! Completes function abi strings.
 use syntax::{
     ast::{self, IsString},
-    AstNode, AstToken,
+    AstNode, AstToken, SmolStr,
 };
 
 use crate::{
@@ -53,7 +53,8 @@ pub(crate) fn complete_extern_abi(
     let abi_str = expanded;
     let source_range = abi_str.text_range_between_quotes()?;
     for &abi in SUPPORTED_CALLING_CONVENTIONS {
-        CompletionItem::new(CompletionItemKind::Keyword, source_range, abi).add_to(acc, ctx.db);
+        CompletionItem::new(CompletionItemKind::Keyword, source_range, SmolStr::new_static(abi))
+            .add_to(acc, ctx.db);
     }
     Some(())
 }

crates/ide-completion/src/completions/item_list/trait_impl.rs

@@ -38,7 +38,7 @@ use ide_db::{
 };
 use syntax::{
     ast::{self, edit_in_place::AttrsOwnerEdit, HasTypeBounds},
-    AstNode, SyntaxElement, SyntaxKind, TextRange, T,
+    format_smolstr, AstNode, SmolStr, SyntaxElement, SyntaxKind, TextRange, T,
 };
 use text_edit::TextEdit;
 
@@ -180,7 +180,7 @@ fn add_function_impl(
 ) {
     let fn_name = func.name(ctx.db);
 
-    let label = format!(
+    let label = format_smolstr!(
         "fn {}({})",
         fn_name.display(ctx.db),
         if func.assoc_fn_params(ctx.db).is_empty() { "" } else { ".." }
@@ -254,7 +254,7 @@ fn add_type_alias_impl(
 ) {
     let alias_name = type_alias.name(ctx.db).unescaped().to_smol_str();
 
-    let label = format!("type {alias_name} =");
+    let label = format_smolstr!("type {alias_name} =");
 
     let mut item = CompletionItem::new(SymbolKind::TypeAlias, replacement_range, label);
     item.lookup_by(format!("type {alias_name}"))
@@ -329,7 +329,7 @@ fn add_const_impl(
                 let replacement = format!("{label} ");
 
                 let mut item = CompletionItem::new(SymbolKind::Const, replacement_range, label);
-                item.lookup_by(format!("const {const_name}"))
+                item.lookup_by(format_smolstr!("const {const_name}"))
                     .set_documentation(const_.docs(ctx.db))
                     .set_relevance(CompletionRelevance {
                         is_item_from_trait: true,
@@ -348,7 +348,7 @@ fn add_const_impl(
     }
 }
 
-fn make_const_compl_syntax(const_: &ast::Const, needs_whitespace: bool) -> String {
+fn make_const_compl_syntax(const_: &ast::Const, needs_whitespace: bool) -> SmolStr {
     let const_ = if needs_whitespace {
         insert_whitespace_into_node::insert_ws_into(const_.syntax().clone())
     } else {
@@ -368,7 +368,7 @@ fn make_const_compl_syntax(const_: &ast::Const, needs_whitespace: bool) -> Strin
 
     let syntax = const_.text().slice(range).to_string();
 
-    format!("{} =", syntax.trim_end())
+    format_smolstr!("{} =", syntax.trim_end())
 }
 
 fn function_declaration(node: &ast::Fn, needs_whitespace: bool) -> String {

crates/ide-completion/src/completions/record.rs

@@ -1,6 +1,9 @@
 //! Complete fields in record literals and patterns.
 use ide_db::SymbolKind;
-use syntax::ast::{self, Expr};
+use syntax::{
+    ast::{self, Expr},
+    SmolStr,
+};
 
 use crate::{
     context::{DotAccess, DotAccessKind, PatternContext},
@@ -66,8 +69,11 @@ pub(crate) fn complete_record_expr_fields(
             }
             if dot_prefix {
                 cov_mark::hit!(functional_update_one_dot);
-                let mut item =
-                    CompletionItem::new(CompletionItemKind::Snippet, ctx.source_range(), "..");
+                let mut item = CompletionItem::new(
+                    CompletionItemKind::Snippet,
+                    ctx.source_range(),
+                    SmolStr::new_static(".."),
+                );
                 item.insert_text(".");
                 item.add_to(acc, ctx.db);
                 return;
@@ -91,7 +97,11 @@ pub(crate) fn add_default_update(
         // FIXME: This should make use of scope_def like completions so we get all the other goodies
         // that is we should handle this like actually completing the default function
         let completion_text = "..Default::default()";
-        let mut item = CompletionItem::new(SymbolKind::Field, ctx.source_range(), completion_text);
+        let mut item = CompletionItem::new(
+            SymbolKind::Field,
+            ctx.source_range(),
+            SmolStr::new_static(completion_text),
+        );
         let completion_text =
             completion_text.strip_prefix(ctx.token.text()).unwrap_or(completion_text);
         item.insert_text(completion_text).set_relevance(CompletionRelevance {

crates/ide-completion/src/completions/use_.rs

@@ -2,7 +2,7 @@
 
 use hir::ScopeDef;
 use ide_db::{FxHashSet, SymbolKind};
-use syntax::{ast, AstNode};
+use syntax::{ast, format_smolstr, AstNode};
 
 use crate::{
     context::{CompletionContext, PathCompletionCtx, Qualified},
@@ -108,7 +108,7 @@ pub(crate) fn complete_use_path(
                             let item = CompletionItem::new(
                                 CompletionItemKind::SymbolKind(SymbolKind::Enum),
                                 ctx.source_range(),
-                                format!("{}::", e.name(ctx.db).display(ctx.db)),
+                                format_smolstr!("{}::", e.name(ctx.db).display(ctx.db)),
                             );
                             acc.add(item.build(ctx.db));
                         }

crates/ide-completion/src/item.rs

@@ -10,7 +10,7 @@ use ide_db::{
 use itertools::Itertools;
 use smallvec::SmallVec;
 use stdx::{impl_from, never};
-use syntax::{SmolStr, TextRange, TextSize};
+use syntax::{format_smolstr, SmolStr, TextRange, TextSize};
 use text_edit::TextEdit;
 
 use crate::{
@@ -442,7 +442,7 @@ impl Builder {
 
         if !self.doc_aliases.is_empty() {
             let doc_aliases = self.doc_aliases.iter().join(", ");
-            label_detail.replace(SmolStr::from(format!(" (alias {doc_aliases})")));
+            label_detail.replace(format_smolstr!(" (alias {doc_aliases})"));
             let lookup_doc_aliases = self
                 .doc_aliases
                 .iter()
@@ -459,21 +459,21 @@ impl Builder {
                 // after typing a comma or space.
                 .join("");
             if !lookup_doc_aliases.is_empty() {
-                lookup = SmolStr::from(format!("{lookup}{lookup_doc_aliases}"));
+                lookup = format_smolstr!("{lookup}{lookup_doc_aliases}");
             }
         }
         if let [import_edit] = &*self.imports_to_add {
             // snippets can have multiple imports, but normal completions only have up to one
-            label_detail.replace(SmolStr::from(format!(
+            label_detail.replace(format_smolstr!(
                 "{} (use {})",
                 label_detail.as_deref().unwrap_or_default(),
                 import_edit.import_path.display(db)
-            )));
+            ));
         } else if let Some(trait_name) = self.trait_name {
-            label_detail.replace(SmolStr::from(format!(
+            label_detail.replace(format_smolstr!(
                 "{} (as {trait_name})",
                 label_detail.as_deref().unwrap_or_default(),
-            )));
+            ));
         }
 
         let text_edit = match self.text_edit {

crates/ide-completion/src/render.rs

@@ -17,7 +17,7 @@ use ide_db::{
     imports::import_assets::LocatedImport,
     RootDatabase, SnippetCap, SymbolKind,
 };
-use syntax::{AstNode, SmolStr, SyntaxKind, TextRange};
+use syntax::{format_smolstr, AstNode, SmolStr, SyntaxKind, TextRange};
 use text_edit::TextEdit;
 
 use crate::{
@@ -202,7 +202,7 @@ fn field_with_receiver(
 ) -> SmolStr {
     receiver.map_or_else(
         || field_name.into(),
-        |receiver| format!("{}.{field_name}", receiver.display(db)).into(),
+        |receiver| format_smolstr!("{}.{field_name}", receiver.display(db)),
     )
 }
 

crates/ide-completion/src/render/function.rs

@@ -4,7 +4,7 @@ use hir::{db::HirDatabase, AsAssocItem, HirDisplay};
 use ide_db::{SnippetCap, SymbolKind};
 use itertools::Itertools;
 use stdx::{format_to, to_lower_snake_case};
-use syntax::{AstNode, SmolStr};
+use syntax::{format_smolstr, AstNode, SmolStr};
 
 use crate::{
     context::{CompletionContext, DotAccess, DotAccessKind, PathCompletionCtx, PathKind},
@@ -52,13 +52,12 @@ fn render(
 
     let (call, escaped_call) = match &func_kind {
         FuncKind::Method(_, Some(receiver)) => (
-            format!(
+            format_smolstr!(
                 "{}.{}",
                 receiver.unescaped().display(ctx.db()),
                 name.unescaped().display(ctx.db())
-            )
-            .into(),
-            format!("{}.{}", receiver.display(ctx.db()), name.display(ctx.db())).into(),
+            ),
+            format_smolstr!("{}.{}", receiver.display(ctx.db()), name.display(ctx.db())),
         ),
         _ => (name.unescaped().to_smol_str(), name.to_smol_str()),
     };

crates/ide-completion/src/render/macro_.rs

@@ -2,7 +2,7 @@
 
 use hir::HirDisplay;
 use ide_db::{documentation::Documentation, SymbolKind};
-use syntax::SmolStr;
+use syntax::{format_smolstr, SmolStr};
 
 use crate::{
     context::{PathCompletionCtx, PathKind, PatternContext},
@@ -94,7 +94,7 @@ fn label(
 ) -> SmolStr {
     if needs_bang {
         if ctx.snippet_cap().is_some() {
-            SmolStr::from_iter([&*name, "!", bra, "…", ket])
+            format_smolstr!("{name}!{bra}…{ket}",)
         } else {
             banged_name(name)
         }

crates/ide/src/inlay_hints/discriminant.rs

@@ -74,7 +74,7 @@ fn variant_hints(
         },
         Some(InlayTooltip::String(match &d {
             Ok(_) => "enum variant discriminant".into(),
-            Err(e) => format!("{e:?}").into(),
+            Err(e) => format!("{e:?}"),
         })),
         None,
     );

crates/ide/src/inlay_hints/fn_lifetime_fn.rs

@@ -4,11 +4,11 @@
 //! ```
 use ide_db::{syntax_helpers::node_ext::walk_ty, FxHashMap};
 use itertools::Itertools;
-use syntax::SmolStr;
 use syntax::{
     ast::{self, AstNode, HasGenericParams, HasName},
     SyntaxToken,
 };
+use syntax::{format_smolstr, SmolStr};
 
 use crate::{InlayHint, InlayHintPosition, InlayHintsConfig, InlayKind, LifetimeElisionHints};
 
@@ -80,7 +80,7 @@ pub(super) fn hints(
     let mut gen_idx_name = {
         let mut gen = (0u8..).map(|idx| match idx {
             idx if idx < 10 => SmolStr::from_iter(['\'', (idx + 48) as char]),
-            idx => format!("'{idx}").into(),
+            idx => format_smolstr!("'{idx}"),
         });
         move || gen.next().unwrap_or_default()
     };

crates/ide/src/navigation_target.rs

@@ -17,7 +17,7 @@ use ide_db::{
 use stdx::never;
 use syntax::{
     ast::{self, HasName},
-    AstNode, SmolStr, SyntaxNode, TextRange,
+    format_smolstr, AstNode, SmolStr, SyntaxNode, TextRange,
 };
 
 /// `NavigationTarget` represents an element in the editor's UI which you can
@@ -457,7 +457,7 @@ impl TryToNav for hir::Field {
                 |(FileRange { file_id, range: full_range }, focus_range)| {
                     NavigationTarget::from_syntax(
                         file_id,
-                        format!("{}", self.index()).into(),
+                        format_smolstr!("{}", self.index()),
                         focus_range,
                         full_range,
                         SymbolKind::Field,

crates/mbe/src/expander/transcriber.rs

@@ -96,19 +96,19 @@ impl<S: Span> Bindings<S> {
                     | MetaVarKind::Expr
                     | MetaVarKind::Ident => {
                         Fragment::Tokens(tt::TokenTree::Leaf(tt::Leaf::Ident(tt::Ident {
-                            text: SmolStr::new_inline("missing"),
+                            text: SmolStr::new_static("missing"),
                             span,
                         })))
                     }
                     MetaVarKind::Lifetime => {
                         Fragment::Tokens(tt::TokenTree::Leaf(tt::Leaf::Ident(tt::Ident {
-                            text: SmolStr::new_inline("'missing"),
+                            text: SmolStr::new_static("'missing"),
                             span,
                         })))
                     }
                     MetaVarKind::Literal => {
                         Fragment::Tokens(tt::TokenTree::Leaf(tt::Leaf::Ident(tt::Ident {
-                            text: SmolStr::new_inline("\"missing\""),
+                            text: SmolStr::new_static("\"missing\""),
                             span,
                         })))
                     }

crates/syntax/src/lib.rs

@@ -70,7 +70,7 @@ pub use rowan::{
     api::Preorder, Direction, GreenNode, NodeOrToken, SyntaxText, TextRange, TextSize,
     TokenAtOffset, WalkEvent,
 };
-pub use smol_str::SmolStr;
+pub use smol_str::{format_smolstr, SmolStr};
 
 /// `Parse` is the result of the parsing: a syntax tree and a collection of
 /// errors.