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perf: parse_js_number 去 lowercase 分配 + int32 位运算直取

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彭俊皓
2026-08-13 14:48:19 +08:00
parent 033ef9abea
commit d2c21c3a4a
2 changed files with 17 additions and 10 deletions
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crates/oxide_runtime_api/src/lib.rs
+11 -10
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@@ -245,15 +245,16 @@ fn parse_js_number(s: &str) -> f64 {
if t.is_empty() {
return 0.0;
}
let lower = t.to_ascii_lowercase();
if let Some(digits) = lower.strip_prefix("0x") {
return parse_radix_int(digits, 16);
let b = t.as_bytes();
// 前缀探测按字节直接比较（ASCII 大小写不敏感），避免每次转换分配 lowercase。
if b.len() >= 2 && b[0] == b'0' && (b[1] == b'x' || b[1] == b'X') {
return parse_radix_int(&t[2..], 16);
}
if let Some(digits) = lower.strip_prefix("0o") {
return parse_radix_int(digits, 8);
if b.len() >= 2 && b[0] == b'0' && (b[1] == b'o' || b[1] == b'O') {
return parse_radix_int(&t[2..], 8);
}
if let Some(digits) = lower.strip_prefix("0b") {
return parse_radix_int(digits, 2);
if b.len() >= 2 && b[0] == b'0' && (b[1] == b'b' || b[1] == b'B') {
return parse_radix_int(&t[2..], 2);
}
if t == "Infinity" || t == "+Infinity" {
return f64::INFINITY;
@@ -263,9 +264,9 @@ fn parse_js_number(s: &str) -> f64 {
}
// 十进制语法仅允许数字、符号、小数点与指数 e；含其它字符的令牌（如
// inf/nan 变体）不是合法 StringNumericLiteral，一律 NaN。
if !t
.chars()
.all(|c| c.is_ascii_digit() || c == '+' || c == '-' || c == '.' || c == 'e' || c == 'E')
if !b
.iter()
.all(|&c| c.is_ascii_digit() || c == b'+' || c == b'-' || c == b'.' || c == b'e' || c == b'E')
{
return f64::NAN;
}