MediaQuery? processMediaQuery()

in lib/parser.dart [366:417]
39 lines of code
14 McCabe index (conditional complexity)

  MediaQuery? processMediaQuery() {
    // Grammar: [ONLY | NOT]? S* media_type S*
    //          [ AND S* MediaExpr ]* | MediaExpr [ AND S* MediaExpr ]*

    var start = _peekToken.span;

    // Is it a unary media operator?
    var op = _peekToken.text;
    var opLen = op.length;
    var unaryOp = TokenKind.matchMediaOperator(op, 0, opLen);
    if (unaryOp != -1) {
      if (isChecked) {
        if (unaryOp != TokenKind.MEDIA_OP_NOT ||
            unaryOp != TokenKind.MEDIA_OP_ONLY) {
          _warning('Only the unary operators NOT and ONLY allowed',
              _makeSpan(start));
        }
      }
      _next();
      start = _peekToken.span;
    }

    Identifier? type;
    // Get the media type.
    if (_peekIdentifier()) type = identifier();

    var exprs = <MediaExpression>[];

    while (true) {
      // Parse AND if query has a media_type or previous expression.
      var andOp = exprs.isNotEmpty || type != null;
      if (andOp) {
        op = _peekToken.text;
        opLen = op.length;
        if (TokenKind.matchMediaOperator(op, 0, opLen) !=
            TokenKind.MEDIA_OP_AND) {
          break;
        }
        _next();
      }

      var expr = processMediaExpression(andOp);
      if (expr == null) break;

      exprs.add(expr);
    }

    if (unaryOp != -1 || type != null || exprs.isNotEmpty) {
      return MediaQuery(unaryOp, type, exprs, _makeSpan(start));
    }
    return null;
  }