Function readName

xml/_parse_sync.ts:682–741

()

  // ===========================================================================

  function readName(): string {
    const start = pos;

    // First character must be NameStartChar
    if (pos < len) {
      const firstCode = input.charCodeAt(pos);
      // Fast ASCII NameStartChar check
      if (
        (firstCode >= 97 && firstCode <= 122) || // a-z
        (firstCode >= 65 && firstCode <= 90) || // A-Z
        firstCode === 95 || // _
        firstCode === 58 // :
      ) {
        pos++;
      } else if (firstCode > 127) {
        // Non-ASCII: use codePointAt for proper surrogate pair handling
        // Astral plane characters (U+10000+) are represented as surrogate pairs
        const codePoint = input.codePointAt(pos)!;
        if (isNameStartChar(codePoint)) {
          // Advance by 1 for BMP chars, 2 for astral plane (surrogate pairs)
          pos += codePoint > 0xFFFF ? 2 : 1;
        } else {
          // Not a valid name start character
          return "";
        }
      } else {
        // Not a valid name start character
        return "";
      }
    }

    // Remaining characters: NameChar
    while (pos < len) {
      const code = input.charCodeAt(pos);
      // Fast ASCII NameChar check (inline for performance)
      if (
        (code >= 97 && code <= 122) || // a-z
        (code >= 65 && code <= 90) || // A-Z
        (code >= 48 && code <= 57) || // 0-9
        code === 95 || // _
        code === 58 || // :
        code === 46 || // .
        code === 45 // -
      ) {
        pos++;
        continue;
      }
      // Non-ASCII: use codePointAt for proper surrogate pair handling
      if (code > 127) {
        const codePoint = input.codePointAt(pos)!;
        if (isNameChar(codePoint)) {
          // Advance by 1 for BMP chars, 2 for astral plane (surrogate pairs)
          pos += codePoint > 0xFFFF ? 2 : 1;
          continue;
        }
      }
      break;
    }