Remove unnecessary string cloning from the parser

Cargo.toml

@@ -19,6 +19,7 @@ argfile = { version = "0.1.6" }
 assert_cmd = { version = "2.0.13" }
 bincode = { version = "1.3.3" }
 bitflags = { version = "2.4.1" }
+bstr = { version = "1.9.0" }
 cachedir = { version = "0.3.1" }
 chrono = { version = "0.4.33", default-features = false, features = ["clock"] }
 clap = { version = "4.4.18", features = ["derive"] }

crates/ruff_linter/src/rules/flake8_bandit/rules/hardcoded_bind_all_interfaces.rs

@@ -40,7 +40,9 @@ impl Violation for HardcodedBindAllInterfaces {
 pub(crate) fn hardcoded_bind_all_interfaces(checker: &mut Checker, string: StringLike) {
     let is_bind_all_interface = match string {
         StringLike::StringLiteral(ast::ExprStringLiteral { value, .. }) => value == "0.0.0.0",
-        StringLike::FStringLiteral(ast::FStringLiteralElement { value, .. }) => value == "0.0.0.0",
+        StringLike::FStringLiteral(ast::FStringLiteralElement { value, .. }) => {
+            &**value == "0.0.0.0"
+        }
         StringLike::BytesLiteral(_) => return,
     };
 

crates/ruff_linter/src/rules/flynt/helpers.rs

@@ -15,7 +15,7 @@ fn to_f_string_expression_element(inner: &Expr) -> ast::FStringElement {
 /// Convert a string to a [`ast::FStringElement::Literal`].
 pub(super) fn to_f_string_literal_element(s: &str) -> ast::FStringElement {
     ast::FStringElement::Literal(ast::FStringLiteralElement {
-        value: s.to_owned(),
+        value: s.to_string().into_boxed_str(),
         range: TextRange::default(),
     })
 }
@@ -53,7 +53,7 @@ pub(super) fn to_f_string_element(expr: &Expr) -> Option<ast::FStringElement> {
     match expr {
         Expr::StringLiteral(ast::ExprStringLiteral { value, range }) => {
             Some(ast::FStringElement::Literal(ast::FStringLiteralElement {
-                value: value.to_string(),
+                value: value.to_string().into_boxed_str(),
                 range: *range,
             }))
         }

crates/ruff_python_ast/src/comparable.rs

@@ -644,7 +644,7 @@ pub struct ComparableBytesLiteral<'a> {
 impl<'a> From<&'a ast::BytesLiteral> for ComparableBytesLiteral<'a> {
     fn from(bytes_literal: &'a ast::BytesLiteral) -> Self {
         Self {
-            value: bytes_literal.value.as_slice(),
+            value: &bytes_literal.value,
         }
     }
 }

crates/ruff_python_ast/src/nodes.rs

@@ -949,7 +949,7 @@ impl Ranged for FStringExpressionElement {
 #[derive(Clone, Debug, PartialEq)]
 pub struct FStringLiteralElement {
     pub range: TextRange,
-    pub value: String,
+    pub value: Box<str>,
 }
 
 impl Ranged for FStringLiteralElement {
@@ -962,7 +962,7 @@ impl Deref for FStringLiteralElement {
     type Target = str;
 
     fn deref(&self) -> &Self::Target {
-        self.value.as_str()
+        &self.value
     }
 }
 
@@ -1607,7 +1607,7 @@ impl Default for BytesLiteralValueInner {
 #[derive(Clone, Debug, Default, PartialEq)]
 pub struct BytesLiteral {
     pub range: TextRange,
-    pub value: Vec<u8>,
+    pub value: Box<[u8]>,
 }
 
 impl Ranged for BytesLiteral {
@@ -1620,7 +1620,7 @@ impl Deref for BytesLiteral {
     type Target = [u8];
 
     fn deref(&self) -> &Self::Target {
-        self.value.as_slice()
+        &self.value
     }
 }
 

crates/ruff_python_parser/Cargo.toml

@@ -19,14 +19,15 @@ ruff_text_size = { path = "../ruff_text_size" }
 
 anyhow = { workspace = true }
 bitflags = { workspace = true }
+bstr = { workspace = true }
 is-macro = { workspace = true }
 itertools = { workspace = true }
 lalrpop-util = { workspace = true, default-features = false }
 memchr = { workspace = true }
-unicode-ident = { workspace = true }
-unicode_names2 = { workspace = true }
 rustc-hash = { workspace = true }
 static_assertions = { workspace = true }
+unicode-ident = { workspace = true }
+unicode_names2 = { workspace = true }
 
 [dev-dependencies]
 insta = { workspace = true }

crates/ruff_python_parser/src/lib.rs

@@ -119,10 +119,10 @@ pub use token::{StringKind, Tok, TokenKind};
 
 use crate::lexer::LexResult;
 
-mod function;
-// Skip flattening lexer to distinguish from full ruff_python_parser
 mod context;
+mod function;
 mod invalid;
+// Skip flattening lexer to distinguish from full ruff_python_parser
 pub mod lexer;
 mod parser;
 mod soft_keywords;

crates/ruff_python_parser/src/python.lalrpop

@@ -1616,7 +1616,7 @@ StringLiteralOrFString: StringType = {
 StringLiteral: StringType = {
     <location:@L> <string:string> <end_location:@R> =>? {
         let (source, kind, triple_quoted) = string;
-        Ok(parse_string_literal(&source, kind, triple_quoted, (location..end_location).into())?)
+        Ok(parse_string_literal(source, kind, triple_quoted, (location..end_location).into())?)
     }
 };
 
@@ -1633,7 +1633,7 @@ FStringMiddlePattern: ast::FStringElement = {
     FStringReplacementField,
     <location:@L> <fstring_middle:fstring_middle> <end_location:@R> =>? {
         let (source, is_raw, _) = fstring_middle;
-        Ok(parse_fstring_literal_element(&source, is_raw, (location..end_location).into())?)
+        Ok(parse_fstring_literal_element(source, is_raw, (location..end_location).into())?)
     }
 };
 

crates/ruff_python_parser/src/python.rs

@@ -1,5 +1,5 @@
 // auto-generated: "lalrpop 0.20.0"
-// sha3: 02c60b5c591440061dda68775005d87a203b5448c205120bda1566a62fc2147c
+// sha3: d38cc0f2252a58db42d3bd63a102b537865992b3cf51d402cdb4828f48989c9d
 use ruff_text_size::{Ranged, TextLen, TextRange, TextSize};
 use ruff_python_ast::{self as ast, Int, IpyEscapeKind};
 use crate::{
@@ -36369,7 +36369,7 @@ fn __action217<
 {
     {
         let (source, kind, triple_quoted) = string;
-        Ok(parse_string_literal(&source, kind, triple_quoted, (location..end_location).into())?)
+        Ok(parse_string_literal(source, kind, triple_quoted, (location..end_location).into())?)
     }
 }
 
@@ -36419,7 +36419,7 @@ fn __action220<
 {
     {
         let (source, is_raw, _) = fstring_middle;
-        Ok(parse_fstring_literal_element(&source, is_raw, (location..end_location).into())?)
+        Ok(parse_fstring_literal_element(source, is_raw, (location..end_location).into())?)
     }
 }