Method readName

src/parser/token-reader.ts:283–375

(position: number)

  }

  private readName(position: number): NameToken {
    // Skip the leading /
    this.scanner.advance();

    const data = this.scanner.bytes;
    const start = this.scanner.position;
    let pos = start;
    const len = data.length;

    // Fast path: scan for end of name, checking for # escapes
    let hasEscape = false;

    while (pos < len) {
      const byte = data[pos];

      if (!isRegularChar(byte)) {
        break;
      }

      if (byte === CHAR_HASH) {
        hasEscape = true;
        break;
      }

      pos++;
    }

    if (!hasEscape) {
      // Common case: pure ASCII name with no escapes.
      // Build string directly from byte range — no intermediate array,
      // no Uint8Array allocation, no TextDecoder.
      this.scanner.moveTo(pos);

      let value = "";

      for (let i = start; i < pos; i++) {
        value += String.fromCharCode(data[i]);
      }

      return { type: "name", value, position };
    }

    // Slow path: name contains # escapes, need byte-by-byte processing.
    // Reset scanner to start and use the original accumulation approach.
    this.scanner.moveTo(start);

    const bytes: number[] = [];

    while (true) {
      const byte = this.scanner.peek();

      if (!isRegularChar(byte)) {
        break;
      }

      this.scanner.advance();

      // Handle # hex escape