replaced Box<str> with SmolStr

frontend/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-phf = { version = "0.11", features = ["macros"] }
-thiserror = "1"
-itertools = "0.13"
+smol_str = "0.2.2"
+phf = { version = "0.11.2", features = ["macros"] }
+thiserror = "1.0.63"
+itertools = "0.13.0"

frontend/src/lexer/_lexer.rs

@@ -1,4 +1,5 @@
 use phf::phf_map;
+use smol_str::SmolStr;
 
 use super::{CodePos, LexerError, Token, TokenType};
 
@@ -130,8 +131,9 @@ impl Lexer {
                     // advance until either source is empty or newline if found
                     while !self.source_is_empty() && self.advance() != '\n' {}
 
-                    let comment: Box<str> =
-                        self.source[self.start + 2..self.current].iter().collect();
+                    let comment = SmolStr::from_iter(
+                        self.source[self.start + 2..self.current].iter().cloned(),
+                    );
 
                     self.push_token(TokenType::Comment(comment));
                 } else if self.consume('*') {
@@ -170,9 +172,11 @@ impl Lexer {
                         self.advance();
                     }
 
-                    let comment: Box<str> = self.source[self.start + 2..self.current - 2]
-                        .iter()
-                        .collect();
+                    let comment = SmolStr::from_iter(
+                        self.source[self.start + 2..self.current - 2]
+                            .iter()
+                            .cloned(),
+                    );
 
                     self.push_token(TokenType::Comment(comment));
                 } else {
@@ -289,11 +293,6 @@ impl Lexer {
             }
         }
 
-        // let string_literal: Box<str> = self.source[self.start + 1..self.current - 1]
-        //     .iter()
-        //     .collect();
-
-        // Some(TokenType::String(Box::new(string_literal)))
         self.tokens.push(Token::new_string(s, self.code_pos));
     }
 

frontend/src/lexer/token.rs

@@ -1,5 +1,7 @@
 use std::fmt::{Debug, Display};
 
+use smol_str::SmolStr;
+
 use super::CodePos;
 
 #[repr(u8)]
@@ -17,13 +19,13 @@ pub enum TokenType {
     Less, LessEqual,
 
     // Identifier and literals
-    Identifier(Box<str>), String(Box<str>), Number(f64),
+    Identifier(SmolStr), String(SmolStr), Number(f64),
 
     // Keywords
     And, Break, Class, Else, False, Fun, For, If, Nil, Or,
     Print, Return, Super, This, True, Var, While,
 
-    Comment(Box<str>),
+    Comment(SmolStr),
 
     #[allow(clippy::upper_case_acronyms)]
     EOF
@@ -42,14 +44,14 @@ impl Token {
         }
     }
 
-    pub fn new_string(s: impl Into<Box<str>>, code_pos: CodePos) -> Self {
+    pub fn new_string(s: impl Into<SmolStr>, code_pos: CodePos) -> Self {
         Token {
             token_type: TokenType::String(s.into()),
             code_pos,
         }
     }
 
-    pub fn new_identifier(name: impl Into<Box<str>>, code_pos: CodePos) -> Self {
+    pub fn new_identifier(name: impl Into<SmolStr>, code_pos: CodePos) -> Self {
         Token {
             token_type: TokenType::Identifier(name.into()),
             code_pos,

frontend/src/parser/_parser.rs

@@ -1,3 +1,5 @@
+use smol_str::SmolStr;
+
 use crate::lexer::{Token, TokenType};
 use crate::parser::expr::BinaryOp;
 
@@ -481,7 +483,7 @@ impl Parser {
         Ok(Expr::function(name, param_names, body))
     }
 
-    fn collect_params(&mut self) -> ParserResult<Vec<Box<str>>> {
+    fn collect_params(&mut self) -> ParserResult<Vec<SmolStr>> {
         assert_eq!(self.next_token().token_type, TokenType::LeftParen);
 
         if self.peek_token().token_type == TokenType::RightParen {
@@ -825,7 +827,7 @@ impl Parser {
         })
     }
 
-    fn identifier(&mut self, msg: &str) -> ParserResult<Box<str>> {
+    fn identifier(&mut self, msg: &str) -> ParserResult<SmolStr> {
         match self.peek_token().token_type {
             TokenType::Identifier(_) => match self.next_token().token_type {
                 TokenType::Identifier(s) => Ok(s),

frontend/src/parser/expr.rs

@@ -1,6 +1,7 @@
 use std::fmt::Display;
 
 use itertools::Itertools;
+use smol_str::SmolStr;
 
 use super::Stmt;
 
@@ -27,14 +28,14 @@ pub enum Expr {
         expr: Box<Expr>,
     },
     Variable {
-        name: Box<str>,
+        name: SmolStr,
     },
     LocalVariable {
-        name: Box<str>,
+        name: SmolStr,
         level: usize,
     },
     GlobalVariable {
-        name: Box<str>,
+        name: SmolStr,
     },
     Assignment {
         target: Box<Expr>,
@@ -46,21 +47,21 @@ pub enum Expr {
     },
     Get {
         target: Box<Expr>,
-        name: Box<str>,
+        name: SmolStr,
     },
     Set {
         target: Box<Expr>,
-        name: Box<str>,
+        name: SmolStr,
         value: Box<Expr>,
     },
     Function {
-        name: Box<str>,
-        param_names: Vec<Box<str>>,
-        closure_vars: Vec<(Box<str>, usize)>,
+        name: SmolStr,
+        param_names: Vec<SmolStr>,
+        closure_vars: Vec<(SmolStr, usize)>,
         body: Box<Stmt>,
     },
     Class {
-        name: Box<str>,
+        name: SmolStr,
         superclass: Option<Box<Expr>>,
         methods: Box<Vec<Expr>>,
     },
@@ -68,12 +69,12 @@ pub enum Expr {
     Super {
         super_var: Box<Expr>,
         this_var: Box<Expr>,
-        method: Box<str>,
+        method: SmolStr,
     },
 }
 
 impl Expr {
-    pub fn string(s: impl Into<Box<str>>) -> Self {
+    pub fn string(s: impl Into<SmolStr>) -> Self {
         let s = s.into();
         Expr::Literal {
             literal: Literal::String(s),
@@ -120,17 +121,17 @@ impl Expr {
         Expr::Grouping { expr }
     }
 
-    pub fn variable(name: impl Into<Box<str>>) -> Self {
+    pub fn variable(name: impl Into<SmolStr>) -> Self {
         let name = name.into();
         Expr::Variable { name }
     }
 
-    pub fn local_variable(name: impl Into<Box<str>>, level: usize) -> Self {
+    pub fn local_variable(name: impl Into<SmolStr>, level: usize) -> Self {
         let name = name.into();
         Expr::LocalVariable { name, level }
     }
 
-    pub fn global_variable(name: impl Into<Box<str>>) -> Self {
+    pub fn global_variable(name: impl Into<SmolStr>) -> Self {
         let name = name.into();
         Expr::GlobalVariable { name }
     }
@@ -146,13 +147,13 @@ impl Expr {
         Expr::Call { callee, args }
     }
 
-    pub fn get(target: Expr, name: impl Into<Box<str>>) -> Self {
+    pub fn get(target: Expr, name: impl Into<SmolStr>) -> Self {
         let target = Box::new(target);
         let name = name.into();
         Expr::Get { target, name }
     }
 
-    pub fn function(name: impl Into<Box<str>>, param_names: Vec<Box<str>>, body: Stmt) -> Self {
+    pub fn function(name: impl Into<SmolStr>, param_names: Vec<SmolStr>, body: Stmt) -> Self {
         let name = name.into();
         #[allow(clippy::box_default)]
         // let closure_vars = Box::new(Vec::new());
@@ -166,7 +167,7 @@ impl Expr {
         }
     }
 
-    pub fn class(name: impl Into<Box<str>>, methods: Vec<Expr>, superclass: Option<Expr>) -> Self {
+    pub fn class(name: impl Into<SmolStr>, methods: Vec<Expr>, superclass: Option<Expr>) -> Self {
         let superclass = superclass.map(Box::new);
         let name = name.into();
         let methods = Box::new(methods);
@@ -181,7 +182,7 @@ impl Expr {
     pub fn super_(
         super_var: impl Into<Box<Expr>>,
         this_var: impl Into<Box<Expr>>,
-        method: impl Into<Box<str>>,
+        method: impl Into<SmolStr>,
     ) -> Self {
         let super_var = super_var.into();
         let this_var = this_var.into();
@@ -267,7 +268,7 @@ impl Display for Expr {
 
 #[derive(Debug, Clone)]
 pub enum Literal {
-    String(Box<str>),
+    String(SmolStr),
     Number(f64),
     Bool(bool),
     Nil,

frontend/src/parser/stmt.rs

@@ -1,5 +1,7 @@
 use std::fmt::Display;
 
+use smol_str::SmolStr;
+
 use super::misc::indent;
 use super::Expr;
 
@@ -18,7 +20,7 @@ pub enum Stmt {
         body: Box<Stmt>,
     },
     VarDecl {
-        name: Box<str>,
+        name: SmolStr,
         initializer: Box<Expr>,
     },
     Block {
@@ -62,7 +64,7 @@ impl Stmt {
         Stmt::While { condition, body }
     }
 
-    pub fn var_decl(name: impl Into<Box<str>>, initializer: impl Into<Box<Expr>>) -> Self {
+    pub fn var_decl(name: impl Into<SmolStr>, initializer: impl Into<Box<Expr>>) -> Self {
         let name = name.into();
 
         let initializer = initializer.into();