Function parseDTDDeclarationContent

xml/_parse_sync.ts:546–676

* Parse DTD declaration content with whitespace validation. * Validates that quoted strings and parenthesized groups have proper whitespace.

()

   * Validates that quoted strings and parenthesized groups have proper whitespace.
   */
  function parseDTDDeclarationContent(): void {
    let sawWhitespace = true; // Start true since we just saw whitespace after keyword
    let parenDepth = 0;

    while (pos < len) {
      const code = input.charCodeAt(pos);

      if (code === CC_GT && parenDepth === 0) {
        pos++;
        return; // End of declaration
      }

      if (isWhitespace(code)) {
        sawWhitespace = true;
        pos++;
        continue;
      }

      if (code === CC_DQUOTE || code === CC_SQUOTE) {
        // Quoted string - must have whitespace before (unless inside parens)
        if (!sawWhitespace && parenDepth === 0) {
          error("Missing whitespace before quoted string in DTD declaration");
        }
        const quote = code;
        pos++;
        while (pos < len && input.charCodeAt(pos) !== quote) {
          pos++;
        }
        if (pos >= len) {
          error("Unterminated string in DTD declaration");
        }
        pos++;
        sawWhitespace = false;
        continue;
      }

      // Opening paren - must have whitespace before FIRST paren only
      // Nested parens like ((a|b)) are valid without whitespace between them
      if (code === CC_LPAREN) {
        if (!sawWhitespace && parenDepth === 0) {
          error("Missing whitespace before '(' in DTD declaration");
        }
        parenDepth++;
        sawWhitespace = false;
        pos++;
        continue;
      }

      if (code === CC_RPAREN) {
        if (parenDepth === 0) {
          error("Unexpected ')' in DTD declaration");
        }
        parenDepth--;
        sawWhitespace = false;
        pos++;
        continue;
      }