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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 history
implicit none
type :: location
character(1024)::url
type(location), pointer::next
end type
contains
function last_location(first_location)
implicit none
type(location), pointer::first_location
type(location), pointer::last_location
if(.not. associated(first_location)) then
last_location => null()
else
last_location => first_location
do while(associated(last_location%next))
last_location => last_location%next
end do
end if
end function last_location
function add_location(first_location, url) result(head)
implicit none
type(location), pointer::first_location
type(location), pointer::head
character(*), intent(in)::url
type(location), pointer::last
! Check if it is our first location
if(.not. associated(first_location)) then
allocate(first_location)
first_location%next => null()
first_location%url = url
else
last => last_location(first_location)
if(trim(last%url) /= trim(url)) then
allocate(last%next)
last => last%next
last%next => null()
last%url = url
end if
end if
head => first_location
end function add_location
subroutine back_location(first_location, url)
implicit none
type(location), pointer::first_location
character(*), intent(out)::url
type(location), pointer::last, new_last
url = " "
last => last_location(first_location)
if(associated(last)) then
if(.not. associated(last, first_location)) then
new_last => first_location
do while(.not. associated(new_last%next, last))
new_last => new_last%next
end do
deallocate(last)
else
new_last => first_location
end if
new_last%next => null()
url = new_last%url
end if
end subroutine back_location
end module history
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