Read a number token, handling various numeric formats.
(&mut self)
| 371 | |
| 372 | /// Read a number token, handling various numeric formats. |
| 373 | fn read_number(&mut self) -> Token<'a> { |
| 374 | let start = self.position; |
| 375 | |
| 376 | // Handle hex (0x), octal (0o), binary (0b) |
| 377 | if self.peek() == Some(b'0') { |
| 378 | self.advance(); |
| 379 | if let Some(b) = self.peek() { |
| 380 | if matches!(b, b'x' | b'X' | b'o' | b'O' | b'b' | b'B') { |
| 381 | self.advance(); |
| 382 | } |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | // Read digits (including _ separators) |
| 387 | while let Some(b) = self.peek() { |
| 388 | if b.is_ascii_hexdigit() || b == b'_' { |
| 389 | self.advance(); |
| 390 | } else { |
| 391 | break; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | // Handle decimal point and fraction |
| 396 | if self.peek() == Some(b'.') && self.peek_at(1).map(|b| b.is_ascii_digit()).unwrap_or(false) |
| 397 | { |
| 398 | self.advance(); // consume '.' |
| 399 | while let Some(b) = self.peek() { |
| 400 | if b.is_ascii_digit() || b == b'_' { |
| 401 | self.advance(); |
| 402 | } else { |
| 403 | break; |
| 404 | } |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | // Handle exponent (e.g., 1e10, 2.5E-3) |
| 409 | if let Some(b'e' | b'E') = self.peek() { |
| 410 | self.advance(); |
| 411 | if let Some(b'+' | b'-') = self.peek() { |
| 412 | self.advance(); |
| 413 | } |
| 414 | while let Some(b) = self.peek() { |
| 415 | if b.is_ascii_digit() { |
| 416 | self.advance(); |
| 417 | } else { |
| 418 | break; |
| 419 | } |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | // Handle type suffix (f32, i64, u8, etc.) |
| 424 | while let Some(b) = self.peek() { |
| 425 | if b.is_ascii_alphabetic() { |
| 426 | self.advance(); |
| 427 | } else { |
| 428 | break; |
| 429 | } |
| 430 | } |