visitBinary method

Implementation

@override
visitBinary(BinaryExpression node) {
  dynamic left = node.left.visitBy(this);
  dynamic right = node.right.visitBy(this);
  if (left is String) {
    bindings.add(left);
  }
  if (right is String) {
    bindings.add(right);
  }
  return bindings;
}