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! Copyright (c) 2021 Approximatrix, LLC <support@approximatrix.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 query_utilities
implicit none
type :: query_component
character(len=:), pointer::key
character(len=:), pointer::value
contains
procedure :: parse => query_component_parse
procedure :: destroy => query_component_destroy
procedure :: has_key => query_component_has_key
end type query_component
type :: query
character(len=:), pointer::full
type(query_component), dimension(:), pointer::components
contains
procedure :: init => query_init
procedure :: destroy => query_destroy
procedure :: component_count => query_component_count
procedure :: get_value_by_index => get_query_value_from_index
procedure :: get_value_by_key => get_query_value_from_key
generic, public :: get_value => get_value_by_index, get_value_by_key
end type query
contains
subroutine query_component_parse(self, comptext)
implicit none
class(query_component), intent(out)::self
character(*), intent(in)::comptext
character(len=:), allocatable::decoded
integer::i_in, i_out, i_equals, chnum
allocate(character(len=len_trim(comptext)) :: decoded)
i_equals = 0
i_out = 1
i_in = 1
do while(i_in <= len_trim(comptext))
if(comptext(i_in:i_in) /= '%') then
decoded(i_out:i_out) = comptext(i_in:i_in)
if(comptext(i_in:i_in) == '=') then
i_equals = i_out
end if
i_in = i_in + 1
else
i_in = i_in + 1
read(comptext(i_in:i_in+1), '(Z2)') chnum
decoded(i_out:i_out) = achar(chnum)
i_in = i_in + 2
end if
i_out = i_out + 1
end do
if(i_equals == 0) then
allocate(character(len=len_trim(decoded)) :: self%value)
self%value = decoded
self%key => null()
else
allocate(character(len=i_equals-1) :: self%key)
self%key = decoded(1:i_equals-1)
allocate(character(len=len_trim(decoded)-i_equals) :: self%value)
self%value = decoded(i_equals+1:len_trim(decoded))
end if
deallocate(decoded)
end subroutine query_component_parse
elemental subroutine query_component_destroy(self)
implicit none
class(query_component), intent(inout)::self
if(associated(self%key)) then
deallocate(self%key)
end if
if(associated(self%value)) then
deallocate(self%value)
end if
end subroutine query_component_destroy
pure function query_component_has_key(self) result(res)
implicit none
class(query_component), intent(in)::self
logical::res
res = associated(self%key)
end function query_component_has_key
subroutine query_init(self, str)
implicit none
class(query), intent(out)::self
character(len=*), intent(in)::str
integer::ampersands, i, i_end, i_comp
allocate(character(len=len_trim(str)) :: self%full)
self%full = str
ampersands = 0
do i = 1, len(self%full)
if(self%full(i:i) == '&') then
ampersands = ampersands + 1
end if
end do
allocate(self%components(ampersands + 1))
! Split and parse each component
if(ampersands == 0) then
call self%components(1)%parse(self%full)
else
i_comp = 1
i = 1
i_end = index(self%full, '&')
do while(i_comp < ampersands + 1)
call self%components(i_comp)%parse(self%full(i:i_end-1))
i = i_end + 1
do i_end = i, len_trim(self%full)
if(self%full(i_end:i_end) == '&') then
exit
end if
end do
i_comp = i_comp + 1
end do
call self%components(i_comp)%parse(self%full(i:i_end-1))
end if
end subroutine query_init
pure function query_component_count(self)
implicit none
class(query), intent(in)::self
integer::query_component_count
if(associated(self%components)) then
query_component_count = size(self%components)
else
query_component_count = 0
end if
end function query_component_count
subroutine query_destroy(self)
implicit none
class(query), intent(inout)::self
if(associated(self%full)) then
deallocate(self%full)
self%full => null()
end if
if(associated(self%components)) then
call self%components%destroy()
deallocate(self%components)
self%components => null()
end if
end subroutine query_destroy
function get_query_value_from_index(self, i) result(res)
implicit none
class(query), intent(in)::self
integer, intent(in)::i
character(len=:), pointer::res
if(i <= self%component_count()) then
res => self%components(i)%value
end if
end function get_query_value_from_index
function get_query_value_from_key(self, k) result(res)
implicit none
class(query), intent(in)::self
character(len=*), intent(in)::k
character(len=:), pointer::res
integer::i
do i = 1, self%component_count()
if(self%components(i)%has_key()) then
if(self%components(i)%key == trim(k)) then
res => get_query_value_from_index(self, i)
end if
end if
end do
end function get_query_value_from_key
end module query_utilities
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