json_value_add_member Subroutine

    subroutine json_value_add_member(json,p,member)

    implicit none

    class(json_core),intent(inout) :: json
    type(json_value),pointer       :: p       !! `p` must be a `json_object`
                                              !! or a `json_array`
    type(json_value),pointer       :: member  !! the child member
                                              !! to add to `p`

    integer(IK) :: var_type  !! variable type of `p`

    if (.not. json%exception_thrown) then

        if (associated(p)) then

            call json%info(p,var_type=var_type)

            select case (var_type)
            case(json_object, json_array)

                ! associate the parent
                member%parent => p

                ! add to linked list
                if (associated(p%children)) then
                    p%tail%next => member
                    member%previous => p%tail
                else
                    p%children => member
                    member%previous => null()  !first in the list
                end if

                ! new member is now the last one in the list
                p%tail => member
                p%n_children = p%n_children + 1

            case default
                call json%throw_exception('Error in json_value_add_member: '//&
                                          'can only add child to object or array')
            end select

        else
            call json%throw_exception('Error in json_value_add_member: '//&
                                      'the pointer is not associated')
        end if

    end if

    end subroutine json_value_add_member