pop_char Function

  1. json_module.F90
  2. json_module
  3. pop_char

Variables

ios str_len c ignore

Source Code

pop_char

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 function pop_char(unit, str, eof, skip_ws)

Arguments

Type IntentOptional AttributesName
integer(kind=IK), intent(in) :: unit

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

JSON string (if parsing from a string) – only used if unit=0
logical(kind=LK), intent(out) :: eof

true if the end of the file has been reached.
logical(kind=LK), intent(in), optional :: skip_ws

to ignore whitespace.

Return Value character(kind=CK,len=1)

the popped character.

Description

Get the next character from the file (or string).

See also


Variables

TypeVisibility AttributesNameInitial
integer(kind=IK), public :: ios
integer(kind=IK), public :: str_len
character(kind=CK,len=1), public :: c
logical(kind=LK), public :: ignore

Source Code

    recursive function pop_char(unit, str, eof, skip_ws) result(popped)

    implicit none

    character(kind=CK,len=1)            :: popped  !! the popped character.
    integer(IK),intent(in)              :: unit    !! file unit number (if parsing from a file)
    character(kind=CK,len=*),intent(in) :: str     !! JSON string (if parsing from a string) -- only used if unit=0
    logical(LK),intent(out)             :: eof     !! true if the end of the file has been reached.
    logical(LK),intent(in),optional     :: skip_ws !! to ignore whitespace.

    integer(IK) :: ios,str_len
    character(kind=CK,len=1) :: c
    logical(LK) :: ignore

    if (.not. exception_thrown) then

        eof = .false.
        if (.not. present(skip_ws)) then
            ignore = .false.
        else
            ignore = skip_ws
        end if

        do

            if (pushed_index > 0) then

                ! there is a character pushed back on, most likely from the number parsing
                ! NOTE: this can only occur if reading from a file when use_unformatted_stream=.false.
                c = pushed_char(pushed_index:pushed_index)
                pushed_index = pushed_index - 1

            else

                if (unit/=0) then    !read from the file

                    !read the next character:
                    if (use_unformatted_stream) then
                        read(unit=unit,pos=ipos,iostat=ios) c
                    else
                        read(unit=unit,fmt='(A1)',advance='NO',iostat=ios) c
                    end if
                    ipos = ipos + 1

                    !....note: maybe try read the file in chunks...
                    !.... or use asynchronous read with double buffering
                    !     (see Modern Fortran: Style and Usage)

                else    !read from the string

                    str_len = len(str)   !length of the string
                    if (ipos<=str_len) then
                        c = str(ipos:ipos)
                        ios = 0
                    else
                        ios = IOSTAT_END  !end of the string
                    end if
                    ipos = ipos + 1

                end if

                char_count = char_count + 1    !character count in the current line

                if (IS_IOSTAT_END(ios)) then  !end of file

                    char_count = 0
                    eof = .true.
                    exit

                elseif (IS_IOSTAT_EOR(ios) .or. c==newline) then    !end of record

                    char_count = 0
                    line_count = line_count + 1
                    cycle

                end if

            end if

            if (any(c == control_chars)) then

                ! non printing ascii characters
                cycle

            else if (ignore .and. c == space) then

                cycle

            else

                popped = c
                exit

            end if

        end do

    end if

    end function pop_char
© 2015 JSON-Fortran was written by Jacob Williams.
Documentation generated by FORD.