class GraphQL::StaticValidation::TypeStack::FieldStrategy

def pop(stack, node)
  stack.field_definitions.pop
  stack.object_types.pop
  stack.path.pop
end

def push(stack, node)
  parent_type = stack.object_types.last
  parent_type = parent_type.unwrap
  field_definition = stack.schema.get_field(parent_type, node.name)
  stack.field_definitions.push(field_definition)
  if !field_definition.nil?
    next_object_type = field_definition.type
    stack.object_types.push(next_object_type)
  else
    stack.object_types.push(nil)
  end
  stack.path.push(node.alias || node.name)
end