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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 render
implicit none
integer, parameter::render_action_none = 1
integer, parameter::render_action_goto = 2
integer, parameter::render_action_layout = 3
integer, parameter::render_action_back = 4
integer, parameter::render_action_quit = 5
character(11), dimension(2)::base_supported_types = &
["text/plain ", &
"text/gemini" ]
type, abstract :: renderer
integer::y
integer::max_width
contains
procedure::render_proportional
procedure::type_supported
procedure(initialize), deferred::initialize
procedure(prepare_for_layout), deferred::prepare_for_layout
procedure(new_page), deferred::new_page
procedure(calculate_width), deferred::text_width
procedure(calculate_height), deferred::text_height
procedure(calculate_visibility), deferred::is_text_visible
procedure(draw_text), deferred::draw_porportional
procedure(calculate_width), deferred::preformatted_width
procedure(calculate_height), deferred::preformatted_height
procedure(calculate_visibility), deferred::is_preformatted_visible
procedure(draw_text), deferred::draw_preformatted
procedure(calculate_width), deferred::link_width
procedure(calculate_height), deferred::link_height
procedure(calculate_visibility), deferred::is_link_visible
procedure(draw_link), deferred::draw_link
procedure(request_input), deferred::request_input
procedure(draw_text), deferred::draw_error
procedure(draw_text), deferred::report_status
procedure(request_action), deferred::request_action
end type renderer
abstract interface
subroutine initialize(self)
import::renderer
class(renderer)::self
end subroutine initialize
end interface
abstract interface
subroutine new_page(self)
import::renderer
class(renderer)::self
end subroutine new_page
end interface
abstract interface
subroutine prepare_for_layout(self)
import::renderer
class(renderer)::self
end subroutine prepare_for_layout
end interface
abstract interface
function calculate_width(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
integer::calculate_width
end function calculate_width
end interface
abstract interface
function calculate_height(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
integer::calculate_height
end function calculate_height
end interface
abstract interface
subroutine draw_text(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
end subroutine draw_text
end interface
abstract interface
function calculate_visibility(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
logical::calculate_visibility
end function calculate_visibility
end interface
abstract interface
subroutine draw_link(self, text, url)
import::renderer
class(renderer)::self
character(*), intent(in)::text, url
end subroutine draw_link
end interface
abstract interface
function request_input(self, question, answer)
import::renderer
class(renderer)::self
character(*), intent(in)::question
character(*), intent(out)::answer
logical::request_input
end function request_input
end interface
abstract interface
function request_action(self, text)
import::renderer
class(renderer)::self
character(*), intent(out)::text
integer::request_action
end function request_action
end interface
abstract interface
function request_save_filename(self, url, mimetype, filename)
import::renderer
class(renderer)::self
character(*), intent(in)::url
character(*), intent(in)::mimetype
character(*), intent(out)::filename
logical::request_save_filename
end function request_save_filename
end interface
contains
function type_supported(self, mimetype)
implicit none
class(renderer)::self
character(*), intent(in)::mimetype
logical::type_supported
integer::i
integer::istop
istop = index(mimetype, ";") - 1
if(istop < 1) then
istop = len_trim(mimetype)
end if
type_supported = .false.
do i = 1, size(base_supported_types)
if(mimetype(1:istop) == trim(base_supported_types(i))) then
type_supported = .true.
exit
end if
end do
end function type_supported
function width_of_line(r, text, startpos, endpos)
implicit none
class(renderer)::r
character(*), intent(in)::text
integer, intent(in)::startpos, endpos
integer::width_of_line
integer::my_start, my_end
my_end = endpos
if(endpos <= 0) then
my_end = len_trim(text)
end if
my_start = startpos
if(startpos <= 0) then
my_start = 1
end if
if(my_end <= my_start) then
width_of_line = 0
else
width_of_line = r%text_width(text(my_start:my_end))
end if
end function width_of_line
function wrap_line(r, text, startpos) result(endpos)
implicit none
class(renderer)::r
character(*), intent(in)::text
integer, intent(in)::startpos
integer::endpos
integer::my_start
integer::w
my_start = startpos
if(startpos == 0) then
my_start = 1
end if
endpos = len_trim(text)
w = width_of_line(r, text, my_start, endpos)
do while(w > r%max_width)
endpos = endpos - 1
do while(text(endpos:endpos) /= ' ' .and. text(endpos:endpos) /= '-' .and. endpos > my_start)
endpos = endpos - 1
end do
w = width_of_line(r, text, my_start, endpos)
end do
end function wrap_line
subroutine render_proportional(r, text)
implicit none
class(renderer)::r
character(*)::text
integer::startpos, endpos
if(len_trim(text) == 0) then
if(r%is_text_visible(" ")) then
call r%draw_porportional("")
end if
r%y = r%y + r%text_height(" ")
else
startpos = 1
endpos = wrap_line(r, text, startpos)
do while(endpos > startpos)
if(r%is_text_visible(text(startpos:endpos))) then
call r%draw_porportional(text(startpos:endpos))
end if
r%y = r%y + r%text_height(text(startpos:endpos))
! Advance string positions
startpos = endpos+1
do while(text(startpos:startpos) == ' ')
startpos = startpos + 1
end do
endpos = wrap_line(r, text, startpos)
end do
end if
end subroutine render_proportional
subroutine render_preformatted(r, text)
implicit none
class(renderer)::r
character(*)::text
if(r%is_preformatted_visible(text)) then
call r%draw_preformatted(text)
end if
r%y = r%y + r%preformatted_height(text)
end subroutine render_preformatted
subroutine render_link(r, text)
implicit none
class(renderer)::r
character(*)::text
integer::i_whitespace, d_length
character(len=:), allocatable::url, display
! Find the url first - just allocate the same
! size as the text, good enough...
allocate(character(len=len_trim(text)) :: url)
url = adjustl(text)
! The display text occurs after the first whitespace
! in url now
i_whitespace = index(trim(url)," ")
if(index(trim(url), CHAR(9)) > 0) then
if(i_whitespace == 0 .OR. index(trim(url), CHAR(9)) < i_whitespace) then
i_whitespace = index(trim(url), CHAR(9))
end if
end if
if(i_whitespace == 0) then
allocate(character(len=len_trim(url)) :: display)
display = url
else
d_length = len_trim(url) - i_whitespace + 1
allocate(character(len=d_length) :: display)
display = adjustl(url(i_whitespace:len_trim(url)))
url = url(1:(i_whitespace-1))
end if
if(r%is_link_visible(display)) then
call r%draw_link(display, url)
end if
r%y = r%y + r%link_height(display)
deallocate(url)
deallocate(display)
end subroutine render_link
function handle_input(r, url, unit_number)
use escaper
implicit none
class(renderer)::r
character(*), intent(inout)::url
integer, intent(in)::unit_number
logical::handle_input
character(1024)::response_line
character(256)::answer
integer::question_index
rewind(unit_number)
read(unit_number, '(A1024)') response_line
question_index = 3
do while(response_line(question_index:question_index) == " " .or. &
response_line(question_index:question_index) == char(9))
question_index = question_index + 1
end do
handle_input = r%request_input(response_line(question_index:len_trim(response_line)), &
answer)
if(handle_input) then
question_index = index(url, "?")
if(question_index < 1) then
url = trim(url)//"?"
question_index = len_trim(url)
end if
call escape_string(answer)
url = url(1:question_index)//answer
end if
end function handle_input
end module render
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