get_current_line_from_file_stream Subroutine

private subroutine get_current_line_from_file_stream(json, iunit, line)

Rewind the file to the beginning of the current line, and return this line. The file is assumed to be opened. This is the STREAM version (see also get_current_line_from_file_sequential).

Type Bound

json_core

Arguments

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

file unit number
character(kind=CK, len=:), intent(out), allocatable :: line

current line

Called by

proc~~get_current_line_from_file_stream~~CalledByGraph proc~get_current_line_from_file_stream json_value_module::json_core%get_current_line_from_file_stream proc~annotate_invalid_json json_value_module::json_core%annotate_invalid_json proc~annotate_invalid_json->proc~get_current_line_from_file_stream proc~json_parse_file json_value_module::json_core%json_parse_file proc~json_parse_file->proc~annotate_invalid_json proc~json_parse_string json_value_module::json_core%json_parse_string proc~json_parse_string->proc~annotate_invalid_json none~deserialize json_value_module::json_core%deserialize none~deserialize->proc~json_parse_string none~load json_value_module::json_core%load none~load->proc~json_parse_file proc~json_file_load json_file_module::json_file%json_file_load proc~json_file_load->none~load proc~json_file_load_from_string json_file_module::json_file%json_file_load_from_string proc~json_file_load_from_string->none~deserialize proc~wrap_json_parse_string json_value_module::wrap_json_parse_string proc~wrap_json_parse_string->none~deserialize none~deserialize~2 json_file_module::json_file%deserialize none~deserialize~2->proc~json_file_load_from_string proc~assign_string_to_json_file json_file_module::json_file%assign_string_to_json_file proc~assign_string_to_json_file->none~deserialize~2 proc~initialize_json_file_from_string json_file_module::initialize_json_file_from_string proc~initialize_json_file_from_string->none~deserialize~2 proc~initialize_json_file_from_string_v2 json_file_module::initialize_json_file_from_string_v2 proc~initialize_json_file_from_string_v2->none~deserialize~2 proc~wrap_json_file_load_from_string json_file_module::wrap_json_file_load_from_string proc~wrap_json_file_load_from_string->none~deserialize~2 interface~json_file json_file_module::json_file interface~json_file->proc~initialize_json_file_from_string interface~json_file->proc~initialize_json_file_from_string_v2 proc~wrap_assign_string_to_json_file json_file_module::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 json_file_module::wrap_initialize_json_file_from_string proc~wrap_initialize_json_file_from_string->proc~initialize_json_file_from_string proc~wrap_initialize_json_file_from_string_v2 json_file_module::wrap_initialize_json_file_from_string_v2 proc~wrap_initialize_json_file_from_string_v2->proc~initialize_json_file_from_string_v2

Source Code

    subroutine get_current_line_from_file_stream(json,iunit,line)

    implicit none

    class(json_core),intent(inout)                   :: json
    integer(IK),intent(in)                           :: iunit  !! file unit number
    character(kind=CK,len=:),allocatable,intent(out) :: line   !! current line

    integer(IK)              :: istart  !! start position of current line
    integer(IK)              :: iend    !! end position of current line
    integer(IK)              :: ios     !! file read `iostat` code
    character(kind=CK,len=1) :: c       !! a character read from the file
    logical                  :: done    !! flag to exit the loop

    istart = json%ipos
    do
        if (istart<=1) then
            istart = 1
            exit
        end if
        read(iunit,pos=istart,iostat=ios) c
        done = ios /= 0_IK
        if (.not. done) done = c==newline
        if (done) then
            if (istart/=1) istart = istart - 1
            exit
        end if
        istart = istart-1  !rewind until the beginning of the line
    end do
    iend = json%ipos
    do
        read(iunit,pos=iend,iostat=ios) c
        if (IS_IOSTAT_END(ios)) then
            ! account for end of file without linebreak
            iend=iend-1
            exit
        end if
        if (c==newline .or. ios/=0) exit
        iend=iend+1
    end do
    allocate( character(kind=CK,len=iend-istart+1) :: line )
    read(iunit,pos=istart,iostat=ios) line

    end subroutine get_current_line_from_file_stream