refactor(parser): remove TokenValue::Number from Token (#1945)

This PR is part of #1880.

Token size is reduced from 40 to 32 bytes.

crates/oxc_parser/src/js/expression.rs

@@ -17,7 +17,7 @@ use super::{
 };
 use crate::{
     diagnostics,
-    lexer::parse_big_int,
+    lexer::{parse_big_int, parse_float, parse_int},
     lexer::{Kind, TokenValue},
     list::SeparatedList,
     Context, Parser,
@@ -98,7 +98,7 @@ impl<'a> Parser<'a> {
         let span = self.start_span();
         let name = match std::mem::take(&mut self.token.value) {
             TokenValue::String(value) => value,
-            _ => "",
+            TokenValue::None => "",
         };
         self.bump_remap(kind);
         (self.end_span(span), Atom::from(name))
@@ -277,8 +277,15 @@ impl<'a> Parser<'a> {
 
     pub(crate) fn parse_literal_number(&mut self) -> Result<NumberLiteral<'a>> {
         let span = self.start_span();
-        let value = self.cur_token().value.as_number();
-        let base = match self.cur_kind() {
+        let token = self.cur_token();
+        let src = self.cur_src();
+        let value = match token.kind {
+            Kind::Decimal | Kind::Binary | Kind::Octal | Kind::Hex => parse_int(src, token.kind),
+            Kind::Float | Kind::PositiveExponential | Kind::NegativeExponential => parse_float(src),
+            _ => unreachable!(),
+        }
+        .map_err(|err| diagnostics::InvalidNumber(err, token.span()))?;
+        let base = match token.kind {
             Kind::Decimal => NumberBase::Decimal,
             Kind::Float => NumberBase::Float,
             Kind::Binary => NumberBase::Binary,
@@ -293,9 +300,8 @@ impl<'a> Parser<'a> {
             }
             _ => return Err(self.unexpected()),
         };
-        let raw = self.cur_src();
         self.bump_any();
-        Ok(NumberLiteral::new(self.end_span(span), value, raw, base))
+        Ok(NumberLiteral::new(self.end_span(span), value, src, base))
     }
 
     pub(crate) fn parse_literal_bigint(&mut self) -> Result<BigintLiteral> {

crates/oxc_parser/src/lexer/mod.rs

@@ -26,12 +26,11 @@ use oxc_syntax::{
 };
 pub use token::{Token, TokenValue};
 
-pub use self::{kind::Kind, number::parse_big_int};
-use self::{
-    number::{parse_float, parse_int},
-    string_builder::AutoCow,
-    trivia_builder::TriviaBuilder,
+pub use self::{
+    kind::Kind,
+    number::{parse_big_int, parse_float, parse_int},
 };
+use self::{string_builder::AutoCow, trivia_builder::TriviaBuilder};
 use crate::{diagnostics, MAX_LEN};
 
 #[derive(Debug, Clone)]
@@ -298,34 +297,6 @@ impl<'a> Lexer<'a> {
         }
     }
 
-    fn set_numeric_value(&mut self, kind: Kind, src: &'a str) {
-        let value = match kind {
-            Kind::Decimal | Kind::Binary | Kind::Octal | Kind::Hex => {
-                if src.ends_with('n') {
-                    // BigInt is parsed lazily in the parser
-                    return;
-                }
-                parse_int(src, kind).map(TokenValue::Number)
-            }
-            Kind::Float | Kind::PositiveExponential | Kind::NegativeExponential => {
-                parse_float(src).map(TokenValue::Number)
-            }
-            Kind::Undetermined => Ok(TokenValue::Number(std::f64::NAN)),
-            _ => unreachable!("{kind}"),
-        };
-
-        match value {
-            Ok(value) => self.current.token.value = value,
-            Err(err) => {
-                self.error(diagnostics::InvalidNumber(
-                    err,
-                    Span::new(self.current.token.start, self.offset()),
-                ));
-                self.current.token.value = TokenValue::Number(std::f64::NAN);
-            }
-        };
-    }
-
     /// Read each char and set the current token
     /// Whitespace and line terminators are skipped
     fn read_next_token(&mut self) -> Kind {
@@ -1459,11 +1430,7 @@ const PRD: ByteHandler = |lexer| {
     let mut builder = AutoCow::new(lexer);
     let c = lexer.consume_char();
     builder.push_matching(c);
-    let kind = lexer.read_dot(&mut builder);
-    if kind.is_number() {
-        lexer.set_numeric_value(kind, builder.finish(lexer));
-    }
-    kind
+    lexer.read_dot(&mut builder)
 };
 
 // /
@@ -1494,9 +1461,7 @@ const ZER: ByteHandler = |lexer| {
     let mut builder = AutoCow::new(lexer);
     let c = lexer.consume_char();
     builder.push_matching(c);
-    let kind = lexer.read_zero(&mut builder);
-    lexer.set_numeric_value(kind, builder.finish(lexer));
-    kind
+    lexer.read_zero(&mut builder)
 };
 
 // 1 to 9
@@ -1504,9 +1469,7 @@ const DIG: ByteHandler = |lexer| {
     let mut builder = AutoCow::new(lexer);
     let c = lexer.consume_char();
     builder.push_matching(c);
-    let kind = lexer.decimal_literal_after_first_digit(&mut builder);
-    lexer.set_numeric_value(kind, builder.finish(lexer));
-    kind
+    lexer.decimal_literal_after_first_digit(&mut builder)
 };
 
 // :

crates/oxc_parser/src/lexer/number.rs

@@ -2,13 +2,18 @@
 //! code copied from [jsparagus](https://github.com/mozilla-spidermonkey/jsparagus/blob/master/crates/parser/src/numeric_value.rs)
 
 use num_bigint::BigInt;
+use std::borrow::Cow;
 
 use super::kind::Kind;
 
 // the string passed in has `_` removed from the lexer
 pub fn parse_int(s: &str, kind: Kind) -> Result<f64, &'static str> {
+    if kind == Kind::Decimal {
+        return parse_float(s);
+    }
+    let s = if s.contains('_') { Cow::Owned(s.replace('_', "")) } else { Cow::Borrowed(s) };
+    let s = s.as_ref();
     match kind {
-        Kind::Decimal => parse_float(s),
         Kind::Binary => Ok(parse_binary(&s[2..])),
         Kind::Octal => {
             let s = if s.starts_with("0o") || s.starts_with("0O") {
@@ -24,6 +29,7 @@ pub fn parse_int(s: &str, kind: Kind) -> Result<f64, &'static str> {
 }
 
 pub fn parse_float(s: &str) -> Result<f64, &'static str> {
+    let s = if s.contains('_') { Cow::Owned(s.replace('_', "")) } else { Cow::Borrowed(s) };
     s.parse::<f64>().map_err(|_| "invalid float")
 }
 

crates/oxc_parser/src/lexer/token.rs

@@ -26,9 +26,7 @@ pub struct Token<'a> {
 
 #[cfg(target_pointer_width = "64")]
 mod size_asserts {
-    use oxc_index::assert_eq_size;
-
-    assert_eq_size!(super::Token, [u8; 40]);
+    oxc_index::assert_eq_size!(super::Token, [u8; 32]);
 }
 
 impl<'a> Token<'a> {
@@ -40,7 +38,6 @@ impl<'a> Token<'a> {
 #[derive(Debug, Copy, Clone)]
 pub enum TokenValue<'a> {
     None,
-    Number(f64),
     String(&'a str),
 }
 
@@ -51,17 +48,10 @@ impl<'a> Default for TokenValue<'a> {
 }
 
 impl<'a> TokenValue<'a> {
-    pub fn as_number(&self) -> f64 {
-        match self {
-            Self::Number(s) => *s,
-            _ => unreachable!("expected number!"),
-        }
-    }
-
     pub fn get_string(&self) -> Option<&str> {
         match self {
             Self::String(s) => Some(s),
-            _ => None,
+            Self::None => None,
         }
     }
 }