parse_value Subroutine

Source File

Variables

eof c tmp

Source Code

All Procedures

add_variables_to_input annotate_invalid_json compact_real_string default_comp_ucs4 default_join_ucs4 destroy_json_data escape_string get_current_line_from_file_sequential get_current_line_from_file_stream initialize_json_file integer_to_string json_add json_check_for_errors json_clear_exceptions json_count json_create_array json_create_double json_create_integer json_create_logical json_create_null json_create_object json_create_string json_destroy json_failed json_file json_file_destroy json_file_get_double json_file_get_double_vec json_file_get_integer json_file_get_integer_vec json_file_get_logical json_file_get_logical_vec json_file_get_object json_file_get_root json_file_get_string json_file_get_string_vec json_file_load json_file_load_from_string json_file_move_pointer json_file_print_1 json_file_print_2 json_file_print_to_console json_file_print_to_string json_file_update_integer json_file_update_logical json_file_update_real json_file_update_string json_file_update_string_name_ascii json_file_update_string_val_ascii json_file_variable_info json_get json_get_array json_get_array_with_path json_get_by_path json_get_child json_get_double json_get_double_vec json_get_double_vec_with_path json_get_double_with_path json_get_integer json_get_integer_vec json_get_integer_vec_with_path json_get_integer_with_path json_get_logical json_get_logical_vec json_get_logical_vec_with_path json_get_logical_with_path json_get_string json_get_string_vec json_get_string_vec_with_path json_get_string_with_path json_info json_initialize json_parse json_parse_file json_parse_string json_print json_print_1 json_print_2 json_print_error_message json_print_to_string json_remove json_remove_if_present json_throw_exception json_traverse json_update json_update_double json_update_integer json_update_logical json_update_string json_update_string_name_ascii json_update_string_val_ascii json_value_add_double json_value_add_double_vec json_value_add_integer json_value_add_integer_vec json_value_add_logical json_value_add_logical_vec json_value_add_member json_value_add_string json_value_add_string_name_ascii json_value_add_string_val_ascii json_value_add_string_vec json_value_add_string_vec_name_ascii json_value_add_string_vec_val_ascii json_value_create json_value_create_array json_value_create_double json_value_create_integer json_value_create_logical json_value_create_null json_value_create_object json_value_create_string json_value_destroy json_value_get_by_index json_value_get_by_name_chars json_value_print json_value_remove json_value_remove_if_present json_value_to_string parse_array parse_for_chars parse_number parse_object parse_string parse_value pop_char push_char read_file real_to_string rename string_to_double string_to_integer test_1 test_10 test_11 test_12 test_13 test_14 test_2 test_3 test_4 test_5 test_6 test_7 test_8 test_9 throw_exception to_array to_double to_integer to_logical to_null to_object to_string to_uni to_uni_vec to_unicode ucs4_comp_default ucs4_join_default valid_json_hex wrap_json_file_get_double wrap_json_file_get_double_vec wrap_json_file_get_integer wrap_json_file_get_integer_vec wrap_json_file_get_logical wrap_json_file_get_logical_vec wrap_json_file_get_object wrap_json_file_get_string wrap_json_file_get_string_vec wrap_json_file_load_from_string wrap_json_file_update_integer wrap_json_file_update_logical wrap_json_file_update_real wrap_json_file_update_string wrap_json_file_variable_info wrap_json_get_array_with_path wrap_json_get_by_path wrap_json_get_double_vec_with_path wrap_json_get_double_with_path wrap_json_get_integer_vec_with_path wrap_json_get_integer_with_path wrap_json_get_logical_vec_with_path wrap_json_get_logical_with_path wrap_json_get_string_vec_with_path wrap_json_get_string_with_path wrap_json_parse_string wrap_json_throw_exception wrap_json_update_double wrap_json_update_integer wrap_json_update_logical wrap_json_update_string wrap_json_value_add_double wrap_json_value_add_double_vec wrap_json_value_add_integer wrap_json_value_add_integer_vec wrap_json_value_add_logical wrap_json_value_add_logical_vec wrap_json_value_add_string wrap_json_value_add_string_vec wrap_json_value_create_array wrap_json_value_create_double wrap_json_value_create_integer wrap_json_value_create_logical wrap_json_value_create_null wrap_json_value_create_object wrap_json_value_create_string wrap_json_value_get_by_name_chars wrap_json_value_remove_if_present

private recursive subroutine parse_value(unit, str, value)

Arguments

Type	Intent	Attributes		Name
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),	intent(inout),	pointer	::	value	JSON data that is extracted

Description

Core parsing routine.

Variables

Type	Visibility	Attributes		Name
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