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! Copyright (c) 2020 Jeffrey Armstrong <jeff@rainbow-100.com>
!
! Permission is hereby granted, free of charge, to any person obtaining a copy
! of this software and associated documentation files (the "Software"), to deal
! in the Software without restriction, including without limitation the rights
! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! copies of the Software, and to permit persons to whom the Software is
! furnished to do so, subject to the following conditions:
!
! The above copyright notice and this permission notice shall be included in
! all copies or substantial portions of the Software.
!
! The Software shall be used for Good, not Evil.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.
module file_handling
integer, parameter::file_type_plain_text = 1
integer, parameter::file_type_gemini = 2
character(17), parameter::end_indicator = "** END OF FILE **"
contains
subroutine mark_file_end(unit_number)
implicit none
integer, intent(in)::unit_number
Write(unit_number, '(A1)', advance='no') new_line('a')
Write(unit_number, '(A17)') end_indicator
end subroutine mark_file_end
function is_file_end_marker(text)
implicit none
character(*), intent(in)::text
logical::is_file_end_marker
is_file_end_marker = (index(text, end_indicator) > 0)
end function is_file_end_marker
subroutine skip_line(unit_number)
implicit none
integer, intent(in)::unit_number
character::c
integer::iostatus
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
do while(c /= CHAR(10) .AND. iostatus == 0)
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
end do
end subroutine skip_line
subroutine read_line_text(unit_number, res, iostatus)
implicit none
character(len=:), allocatable, intent(out)::res
integer, intent(in)::unit_number
integer, intent(out)::iostatus
integer::startpos, endpos, length, i
character::c
inquire(unit=unit_number, pos=startpos)
endpos = startpos
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
do while(c /= CHAR(10) .AND. iostatus == 0)
endpos = endpos + 1
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
end do
length = (endpos - startpos + 1)
allocate(character(len=length) :: res)
res = repeat(' ', length)
! Rewind seems necessary, especially on non-Windows...
rewind(unit_number)
read(unit_number, '(A1)', pos=startpos, advance='no', iostat=iostatus) c
if(iostatus == 0) then
res(1:1) = c
do i=2, length
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
if(iostatus /= 0) then
exit
end if
res(i:i) = c
end do
end if
end subroutine read_line_text
subroutine replace_tabs(text)
implicit none
character(*), intent(inout)::text
integer::i
i = index(text, char(9))
do while(i > 0)
text(i:i) = ' '
i = index(text, char(9))
end do
end subroutine replace_tabs
subroutine process_line(single_line, file_type, preformatted_on)
use layout
implicit none
type(line), intent(inout)::single_line
integer, intent(in)::file_type
logical, intent(inout)::preformatted_on
integer::line_length
if(file_type == file_type_plain_text) then
single_line%line_type = line_type_preformatted
preformatted_on = .TRUE.
else if(file_type == file_type_gemini) then
line_length = len_trim(single_line%text)
if((.not. preformatted_on) .AND. line_length > 2 .AND. &
single_line%text(1:2) == "=>") then
single_line%line_type = line_type_link
single_line%text(1:2) = " "
call replace_tabs(single_line%text)
single_line%text = adjustl(single_line%text)
else if(line_length >= 3 .AND. single_line%text(1:3) == "```") then
preformatted_on = .not. preformatted_on
single_line%line_type = line_type_indicator
else if(preformatted_on) then
single_line%line_type = line_type_preformatted
else
single_line%line_type = line_type_text
end if
end if
end subroutine process_line
function load_unit(unit_number, file_type) result(first_line)
use layout
implicit none
integer, intent(in)::unit_number, file_type
type(line), pointer::first_line
type(line), pointer::walker, next_line
integer::iostatus
logical::preformatted_on
preformatted_on = .FALSE.
allocate(first_line)
! Skip the first line - it has the status code
rewind(unit_number)
call skip_line(unit_number)
call read_line_text(unit_number, first_line%text, iostatus)
first_line%next => null()
first_line%breaks => null()
walker=>first_line
do while(iostatus /= -1 .and. .not. is_file_end_marker(walker%text)) ! -1 should be end of file
call process_line(walker, file_type, preformatted_on)
allocate(next_line)
next_line%next => null()
next_line%breaks => null()
walker%next => next_line
next_line => null()
walker => walker%next
call read_line_text(unit_number, walker%text, iostatus)
end do
if(is_file_end_marker(walker%text)) then
walker%text = " "
end if
end function load_unit
function load_filename(filename, iostatus, mimetype) result(first_line)
use layout, only: line
implicit none
character(*), intent(in)::filename
integer, intent(out)::iostatus
character(*), intent(in), optional::mimetype
type(line), pointer::first_line
integer::filetype
open(unit=1097, file=filename, access='stream', iostat=iostatus, form='FORMATTED')
if(iostatus == 0) then
if(present(mimetype)) then
if(trim(mimetype) == 'text/gemini') then
filetype = file_type_gemini
else
filetype = file_type_plain_text
end if
else
filetype = file_type_plain_text
end if
first_line => load_unit(1097, filetype)
end if
end function load_filename
end module file_handling
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