parse_value Subroutine

  1. json_module.F90
  2. json_module
  3. parse_value

private recursivesubroutine parse_value(unit, str, value)

Arguments

Type IntentOptional AttributesName
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

Description

Core parsing routine.

Calls

proc~~parse_value~~CallsGraph proc~parse_value parse_value proc~to_string to_string proc~parse_value->proc~to_string proc~parse_array parse_array proc~parse_value->proc~parse_array proc~pop_char pop_char proc~parse_value->proc~pop_char proc~parse_number parse_number proc~parse_value->proc~parse_number proc~parse_string parse_string proc~parse_value->proc~parse_string proc~to_logical to_logical proc~parse_value->proc~to_logical proc~push_char push_char proc~parse_value->proc~push_char proc~to_object to_object proc~parse_value->proc~to_object proc~to_array to_array proc~parse_value->proc~to_array proc~parse_for_chars parse_for_chars proc~parse_value->proc~parse_for_chars proc~to_null to_null proc~parse_value->proc~to_null proc~parse_object parse_object proc~parse_value->proc~parse_object interface~throw_exception throw_exception proc~parse_value->interface~throw_exception proc~destroy_json_data destroy_json_data proc~to_string->proc~destroy_json_data proc~parse_array->proc~parse_value proc~parse_array->proc~pop_char proc~parse_array->interface~throw_exception interface~json_destroy json_destroy proc~parse_array->interface~json_destroy interface~json_add json_add proc~parse_array->interface~json_add proc~json_value_create json_value_create proc~parse_array->proc~json_value_create proc~parse_number->proc~pop_char proc~parse_number->proc~push_char proc~parse_number->interface~throw_exception proc~to_double to_double proc~parse_number->proc~to_double proc~to_integer to_integer proc~parse_number->proc~to_integer proc~string_to_integer string_to_integer proc~parse_number->proc~string_to_integer proc~string_to_double string_to_double proc~parse_number->proc~string_to_double proc~parse_string->proc~pop_char proc~parse_string->interface~throw_exception proc~valid_json_hex valid_json_hex proc~parse_string->proc~valid_json_hex proc~to_logical->proc~destroy_json_data proc~push_char->interface~throw_exception proc~integer_to_string integer_to_string proc~push_char->proc~integer_to_string proc~to_object->proc~destroy_json_data proc~to_array->proc~destroy_json_data proc~parse_for_chars->proc~pop_char proc~parse_for_chars->interface~throw_exception proc~to_null->proc~destroy_json_data proc~parse_object->proc~parse_value proc~parse_object->proc~pop_char proc~parse_object->proc~parse_string proc~parse_object->proc~parse_object proc~parse_object->interface~throw_exception proc~parse_object->interface~json_destroy proc~parse_object->interface~json_add proc~parse_object->proc~json_value_create proc~json_throw_exception json_throw_exception interface~throw_exception->proc~json_throw_exception proc~json_value_destroy json_value_destroy interface~json_destroy->proc~json_value_destroy proc~json_value_add_logical json_value_add_logical interface~json_add->proc~json_value_add_logical proc~json_value_add_double json_value_add_double interface~json_add->proc~json_value_add_double proc~json_value_add_member json_value_add_member interface~json_add->proc~json_value_add_member proc~json_value_add_integer json_value_add_integer interface~json_add->proc~json_value_add_integer proc~json_value_add_double_vec json_value_add_double_vec interface~json_add->proc~json_value_add_double_vec proc~json_value_add_logical_vec json_value_add_logical_vec interface~json_add->proc~json_value_add_logical_vec proc~json_value_add_integer_vec json_value_add_integer_vec interface~json_add->proc~json_value_add_integer_vec proc~json_value_add_string_vec json_value_add_string_vec interface~json_add->proc~json_value_add_string_vec proc~json_value_add_string json_value_add_string interface~json_add->proc~json_value_add_string proc~json_value_destroy->proc~destroy_json_data proc~json_value_destroy->proc~json_value_destroy proc~json_value_add_logical->proc~to_logical proc~json_value_add_logical->interface~json_add proc~json_value_add_logical->proc~json_value_create proc~json_value_add_double->interface~json_add proc~json_value_add_double->proc~json_value_create proc~json_value_add_double->proc~to_double proc~json_value_add_integer->interface~json_add proc~json_value_add_integer->proc~json_value_create proc~json_value_add_integer->proc~to_integer proc~json_value_add_double_vec->proc~to_array proc~json_value_add_double_vec->interface~json_add proc~json_value_add_double_vec->proc~json_value_create proc~json_value_add_logical_vec->proc~to_array proc~json_value_add_logical_vec->interface~json_add proc~json_value_add_logical_vec->proc~json_value_create proc~json_value_add_integer_vec->proc~to_array proc~json_value_add_integer_vec->interface~json_add proc~json_value_add_integer_vec->proc~json_value_create proc~json_value_add_string_vec->proc~to_array proc~json_value_add_string_vec->interface~json_add proc~json_value_add_string_vec->proc~json_value_create proc~json_value_add_string->proc~to_string proc~json_value_add_string->interface~json_add proc~json_value_add_string->proc~json_value_create proc~escape_string escape_string proc~json_value_add_string->proc~escape_string proc~to_double->proc~destroy_json_data proc~to_integer->proc~destroy_json_data proc~string_to_integer->interface~throw_exception proc~string_to_double->interface~throw_exception
Help

Called By

proc~~parse_value~~CalledByGraph proc~parse_value parse_value proc~parse_object parse_object proc~parse_value->proc~parse_object proc~parse_array parse_array proc~parse_value->proc~parse_array proc~json_parse_string json_parse_string proc~json_parse_string->proc~parse_value proc~json_parse_file json_parse_file proc~json_parse_file->proc~parse_value proc~parse_object->proc~parse_value proc~parse_object->proc~parse_object proc~parse_array->proc~parse_value proc~wrap_json_parse_string wrap_json_parse_string proc~wrap_json_parse_string->proc~json_parse_string interface~json_parse json_parse interface~json_parse->proc~json_parse_string interface~json_parse->proc~json_parse_file proc~test_14 test_14 proc~test_14->interface~json_parse proc~test_8 test_8 proc~test_8->interface~json_parse proc~json_file_load json_file_load proc~json_file_load->interface~json_parse proc~json_file_load_from_string json_file_load_from_string proc~json_file_load_from_string->interface~json_parse program~jf_test_14 jf_test_14 program~jf_test_14->proc~test_14 program~jf_test_8 jf_test_8 program~jf_test_8->proc~test_8 proc~wrap_json_file_load_from_string wrap_json_file_load_from_string proc~wrap_json_file_load_from_string->proc~json_file_load_from_string
Help

Variables

TypeVisibility AttributesNameInitial
logical(kind=LK), public :: eof
character(kind=CK,len=1), public :: c
character(kind=CK,len=:), public, allocatable:: tmp

Source Code

    recursive subroutine parse_value(unit, str, value)

    implicit none

    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
    character(kind=CK,len=1) :: c
    character(kind=CK,len=:),allocatable :: tmp  !this is a work-around for a bug
                                                 ! in the gfortran 4.9 compiler.

    if (.not. exception_thrown) then

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

        ! pop the next non whitespace character off the file
        c = pop_char(unit, str=str, eof = eof, skip_ws = .true.)

        if (eof) then
            return
        else
            select case (c)
            case (start_object)

                ! start object
                call to_object(value)    !allocate class
                call parse_object(unit, str, value)

            case (start_array)

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

            case (end_array)

                ! end an empty array
                call push_char(c)
                nullify(value)

            case (quotation_mark)

                ! string
                call to_string(value)    !allocate class

                select case (value%var_type)
                case (json_string)
                    call parse_string(unit, str, tmp)  !write to a tmp variable because of
                    value%str_value = tmp              ! a bug in 4.9 gfortran compiler.
                    deallocate(tmp)                    !
                end select

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

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

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

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

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

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

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

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

            case default

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

            end select
        end if

    end if

    end subroutine parse_value