parse_value Subroutine

private recursive subroutine parse_value(json, unit, str, value)

Core parsing routine.

Type Bound

json_core

Arguments

Type IntentOptional Attributes Name
class(json_core), intent(inout) :: json
integer(kind=IK), intent(in) :: unit

file unit number
character(kind=CK, len=*), intent(in) :: str

string containing JSON data (only used if unit=0)
type(json_value), pointer :: value

JSON data that is extracted

Calls

proc~~parse_value~~CallsGraph proc~parse_value json_core%parse_value none~throw_exception json_core%throw_exception proc~parse_value->none~throw_exception proc~parse_array json_core%parse_array proc~parse_value->proc~parse_array proc~parse_for_chars json_core%parse_for_chars proc~parse_value->proc~parse_for_chars proc~parse_number json_core%parse_number proc~parse_value->proc~parse_number proc~parse_object json_core%parse_object proc~parse_value->proc~parse_object proc~parse_string json_core%parse_string proc~parse_value->proc~parse_string proc~pop_char json_core%pop_char proc~parse_value->proc~pop_char proc~push_char json_core%push_char proc~parse_value->proc~push_char proc~to_array json_core%to_array proc~parse_value->proc~to_array proc~to_logical json_core%to_logical proc~parse_value->proc~to_logical proc~to_null json_core%to_null proc~parse_value->proc~to_null proc~to_object json_core%to_object proc~parse_value->proc~to_object proc~to_string json_core%to_string proc~parse_value->proc~to_string proc~json_throw_exception json_core%json_throw_exception none~throw_exception->proc~json_throw_exception proc~wrap_json_throw_exception json_core%wrap_json_throw_exception none~throw_exception->proc~wrap_json_throw_exception proc~parse_array->proc~parse_value proc~parse_array->none~throw_exception proc~parse_array->proc~pop_char none~add~4 json_core%add proc~parse_array->none~add~4 none~destroy~3 json_core%destroy proc~parse_array->none~destroy~3 proc~json_value_create json_value_create proc~parse_array->proc~json_value_create proc~parse_for_chars->none~throw_exception proc~parse_for_chars->proc~pop_char proc~parse_number->proc~pop_char proc~parse_number->proc~push_char proc~json_clear_exceptions json_core%json_clear_exceptions proc~parse_number->proc~json_clear_exceptions proc~string_to_dble json_core%string_to_dble proc~parse_number->proc~string_to_dble proc~string_to_int json_core%string_to_int proc~parse_number->proc~string_to_int proc~to_integer json_core%to_integer proc~parse_number->proc~to_integer proc~to_real json_core%to_real proc~parse_number->proc~to_real proc~parse_object->proc~parse_value proc~parse_object->none~throw_exception proc~parse_object->proc~parse_object proc~parse_object->proc~parse_string proc~parse_object->proc~pop_char proc~parse_object->none~add~4 proc~parse_object->none~destroy~3 proc~parse_object->proc~json_value_create proc~parse_string->none~throw_exception proc~parse_string->proc~pop_char proc~unescape_string unescape_string proc~parse_string->proc~unescape_string proc~push_char->none~throw_exception proc~integer_to_string integer_to_string proc~push_char->proc~integer_to_string proc~destroy_json_data destroy_json_data proc~to_array->proc~destroy_json_data proc~to_logical->proc~destroy_json_data proc~to_null->proc~destroy_json_data proc~to_object->proc~destroy_json_data proc~to_string->proc~destroy_json_data proc~json_value_add_string_name_ascii json_core%json_value_add_string_name_ascii none~add~4->proc~json_value_add_string_name_ascii proc~json_value_add_string_val_ascii json_core%json_value_add_string_val_ascii none~add~4->proc~json_value_add_string_val_ascii proc~json_value_add_string_vec_name_ascii json_core%json_value_add_string_vec_name_ascii none~add~4->proc~json_value_add_string_vec_name_ascii proc~json_value_add_string_vec_val_ascii json_core%json_value_add_string_vec_val_ascii none~add~4->proc~json_value_add_string_vec_val_ascii proc~destroy_json_core json_core%destroy_json_core none~destroy~3->proc~destroy_json_core proc~json_value_destroy json_core%json_value_destroy none~destroy~3->proc~json_value_destroy proc~string_to_dble->none~throw_exception proc~string_to_real string_to_real proc~string_to_dble->proc~string_to_real proc~string_to_int->none~throw_exception proc~string_to_integer string_to_integer proc~string_to_int->proc~string_to_integer proc~to_integer->proc~destroy_json_data proc~to_real->proc~destroy_json_data proc~valid_json_hex valid_json_hex proc~unescape_string->proc~valid_json_hex proc~wrap_json_throw_exception->none~throw_exception interface~to_unicode to_unicode proc~wrap_json_throw_exception->interface~to_unicode proc~to_uni to_uni interface~to_unicode->proc~to_uni proc~to_uni_vec to_uni_vec interface~to_unicode->proc~to_uni_vec proc~json_value_add_string_name_ascii->none~add~4 proc~json_value_add_string_name_ascii->interface~to_unicode proc~json_value_add_string_val_ascii->none~add~4 proc~json_value_add_string_val_ascii->interface~to_unicode proc~json_value_add_string_vec_name_ascii->none~add~4 proc~json_value_add_string_vec_name_ascii->interface~to_unicode proc~json_value_add_string_vec_val_ascii->none~add~4 proc~json_value_add_string_vec_val_ascii->interface~to_unicode proc~json_value_destroy->none~destroy~3 proc~json_value_destroy->proc~destroy_json_data

Called by

proc~~parse_value~~CalledByGraph proc~parse_value json_core%parse_value proc~parse_array json_core%parse_array proc~parse_value->proc~parse_array proc~parse_object json_core%parse_object proc~parse_value->proc~parse_object proc~json_parse_file json_core%json_parse_file proc~json_parse_file->proc~parse_value proc~json_parse_string json_core%json_parse_string proc~json_parse_string->proc~parse_value proc~parse_array->proc~parse_value proc~parse_object->proc~parse_value proc~parse_object->proc~parse_object none~deserialize~2 json_core%deserialize none~deserialize~2->proc~json_parse_string proc~wrap_json_parse_string json_core%wrap_json_parse_string none~deserialize~2->proc~wrap_json_parse_string none~load~2 json_core%load none~load~2->proc~json_parse_file proc~json_file_load json_file%json_file_load proc~json_file_load->none~load~2 proc~json_file_load_from_string json_file%json_file_load_from_string proc~json_file_load_from_string->none~deserialize~2 proc~wrap_json_parse_string->none~deserialize~2 none~deserialize json_file%deserialize none~deserialize->proc~json_file_load_from_string proc~wrap_json_file_load_from_string json_file%wrap_json_file_load_from_string none~deserialize->proc~wrap_json_file_load_from_string proc~assign_string_to_json_file json_file%assign_string_to_json_file proc~assign_string_to_json_file->none~deserialize proc~initialize_json_file_from_string initialize_json_file_from_string proc~initialize_json_file_from_string->none~deserialize proc~initialize_json_file_from_string_v2 initialize_json_file_from_string_v2 proc~initialize_json_file_from_string_v2->none~deserialize proc~wrap_json_file_load_from_string->none~deserialize interface~json_file json_file interface~json_file->proc~initialize_json_file_from_string interface~json_file->proc~initialize_json_file_from_string_v2 proc~wrap_initialize_json_file_from_string wrap_initialize_json_file_from_string interface~json_file->proc~wrap_initialize_json_file_from_string proc~wrap_initialize_json_file_from_string_v2 wrap_initialize_json_file_from_string_v2 interface~json_file->proc~wrap_initialize_json_file_from_string_v2 proc~wrap_assign_string_to_json_file json_file%wrap_assign_string_to_json_file proc~wrap_assign_string_to_json_file->proc~assign_string_to_json_file proc~wrap_initialize_json_file_from_string->proc~initialize_json_file_from_string proc~wrap_initialize_json_file_from_string_v2->proc~initialize_json_file_from_string_v2

Source Code

    recursive subroutine parse_value(json, unit, str, value)

    implicit none

    class(json_core),intent(inout)      :: json
    integer(IK),intent(in)              :: unit   !! file unit number
    character(kind=CK,len=*),intent(in) :: str    !! string containing JSON
                                                  !! data (only used if `unit=0`)
    type(json_value),pointer            :: value  !! JSON data that is extracted

    logical(LK)              :: eof !! end-of-file flag
    character(kind=CK,len=1) :: c   !! character read from file
                                    !! (or string) by [[pop_char]]
#if defined __GFORTRAN__
    character(kind=CK,len=:),allocatable :: tmp  !! this is a work-around for a bug
                                                 !! in the gfortran 4.9 compiler.
#endif

    if (.not. json%exception_thrown) then

        !the routine is being called incorrectly.
        if (.not. associated(value)) then
            call json%throw_exception('Error in parse_value: value pointer not associated.')
            return
        end if

        ! pop the next non whitespace character off the file
        call json%pop_char(unit, str=str, eof=eof, skip_ws=.true., &
                           skip_comments=json%allow_comments, popped=c)

        if (eof) then
            return
        else

            select case (c)

            case (start_object)

                ! start object
                call json%to_object(value)    !allocate class
                call json%parse_object(unit, str, value, expecting_next_element=.false.)

            case (start_array)

                ! start array
                call json%to_array(value)    !allocate class
                call json%parse_array(unit, str, value)

            case (end_array)

                ! end an empty array
                call json%push_char(c)
                if (associated(value)) then
                    deallocate(value)
                    nullify(value)
                end if

            case (quotation_mark)

                ! string
                call json%to_string(value)    !allocate class

                select case (value%var_type)
                case (json_string)
#if defined __GFORTRAN__
                    ! write to a tmp variable because of
                    ! a bug in 4.9 gfortran compiler.
                    call json%parse_string(unit,str,tmp)
                    value%str_value = tmp
                    if (allocated(tmp))  deallocate(tmp)
#else
                    call json%parse_string(unit,str,value%str_value)
#endif
                end select

            case (CK_'t') !true_str(1:1) gfortran bug work around

                !true
                call json%parse_for_chars(unit, str, true_str(2:))
                !allocate class and set value:
                if (.not. json%exception_thrown) call json%to_logical(value,.true.)

            case (CK_'f') !false_str(1:1) gfortran bug work around

                !false
                call json%parse_for_chars(unit, str, false_str(2:))
                !allocate class and set value:
                if (.not. json%exception_thrown) call json%to_logical(value,.false.)

            case (CK_'n') !null_str(1:1) gfortran bug work around

                !null
                call json%parse_for_chars(unit, str, null_str(2:))
                if (.not. json%exception_thrown) call json%to_null(value) ! allocate class

            case(CK_'-', CK_'0': CK_'9', CK_'.', CK_'+')

                call json%push_char(c)
                call json%parse_number(unit, str, value)

            case default

                call json%throw_exception('Error in parse_value:'//&
                                          ' Unexpected character while parsing value. "'//&
                                          c//'"')

            end select
        end if

    end if

    end subroutine parse_value