utils.f90

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module utils
  use, intrinsic :: iso_fortran_env, only: error_unit, output_unit
  implicit none
  private
 
  integer, parameter :: neko_fname_len = 1024
 
  interface neko_error
     module procedure neko_error_plain, neko_error_msg
  end interface neko_error
 
  public :: neko_error, neko_warning, nonlinear_index, filename_chsuffix, &
       filename_suffix, filename_suffix_pos, filename_tslash_pos, &
       linear_index, split_string, neko_fname_len, index_is_on_facet, &
       concat_string_array, extract_fld_file_index, neko_type_error
 
 
contains
 
  pure function filename_suffix_pos(fname) result(suffix_pos)
    character(len=*), intent(in) :: fname
    integer :: suffix_pos
    suffix_pos = scan(trim(fname), '.', back = .true.)
  end function filename_suffix_pos
 
  pure function filename_tslash_pos(fname) result(tslash_pos)
    character(len=*), intent(in) :: fname
    integer :: tslash_pos
    tslash_pos = scan(trim(fname), '/', back = .true.)
  end function filename_tslash_pos
 
  subroutine filename_suffix(fname, suffix)
    character(len=*) :: fname
    character(len=*) :: suffix
    suffix = trim(fname(filename_suffix_pos(fname) + 1:len_trim(fname)))
  end subroutine filename_suffix
 
  subroutine filename_chsuffix(fname, new_fname, new_suffix)
    character(len=*) :: fname
    character(len=*) :: new_fname
    character(len=*) :: new_suffix
    integer :: suffix_pos
 
    suffix_pos = filename_suffix_pos(fname)
    new_fname = trim(fname(1:suffix_pos))//new_suffix
 
  end subroutine filename_chsuffix
 
  function extract_fld_file_index(fld_filename, default_index) result(index)
    character(len=*), intent(in) :: fld_filename
    integer, intent(in) :: default_index
 
    character(len=80) :: suffix
    integer :: index, fpos, i
    logical :: valid
 
    call filename_suffix(fld_filename, suffix)
 
    valid = .true.
 
    ! This value will be modified when reading the file name extension
    ! e.g. "field0.f00035" will set sample_idx = 35
    index = default_index
 
    !
    ! Try to extract the index of the field file from the suffix "fxxxxx"
    !
    fpos = scan(trim(suffix), 'f')
    if (fpos .eq. 1) then
       ! Make sure that the suffix only contains integers from 0 to 9
       do i = 2, len(trim(suffix))
          if (.not. (iachar(suffix(i:i)) >= iachar('0') &
               .and. iachar(suffix(i:i)) <= iachar('9'))) then
             valid = .false.
          end if
       end do
    else
       valid = .false.
    end if
 
    ! Must be exactly 6 characters long, i.e. an 'f' with 5 integers after
    if (len(trim(suffix)) .ne. 6) valid = .false.
 
    if (valid) read (suffix(2:), "(I5.5)") index
 
  end function extract_fld_file_index
 
  function split_string(string, delimiter) result(split_str)
    character(len=*) :: string
    character(len=*) :: delimiter
    character(len=100), allocatable :: split_str(:)
    integer :: length, i, i2, offset, j
    i = 0
    offset = 1
    length = 1
    if (len(trim(string)) .eq. 0) then
       allocate(split_str(1))
       split_str(1) = trim(string)
       return
    end if
    do while (.true.)
       i = scan(string(offset:), delimiter, back = .false.)
       if (i .eq. 0) exit
       length = length + 1
       offset = offset + i
    end do
 
    allocate(split_str(length))
    i = 0
    j = 1
    offset = 1
    do while (.true.)
       i2 = scan(trim(string(offset:)), delimiter, back = .false.)
       if (i2 .eq. 0) then
          split_str(j) = trim(string(offset:))
          exit
       end if
       split_str(j) = trim(string(offset:offset+i2-2))
       offset = offset+i2
       j = j + 1
    end do
  end function split_string
 
  pure function linear_index(i, j, k, l, lx, ly, lz) result(index)
    integer, intent(in) :: i, j, k, l, lx, ly, lz
    integer :: index
 
    index = (i + lx * ((j - 1) + ly * ((k - 1) + lz * ((l - 1)))))
  end function linear_index
 
  pure function nonlinear_index(linear_index, lx, ly, lz) result(index)
    integer, intent(in) :: linear_index, lx, ly, lz
    integer :: index(4)
    integer :: lin_idx
    lin_idx = linear_index -1
    index(4) = lin_idx/(lx*ly*lz)
    index(3) = (lin_idx-(lx*ly*lz)*index(4))/(lx*ly)
    index(2) = (lin_idx-(lx*ly*lz)*index(4)-(lx*ly)*index(3))/lx
    index(1) = (lin_idx-(lx*ly*lz)*index(4)-(lx*ly)*index(3)-lx*index(2))
    index(1) = index(1) + 1
    index(2) = index(2) + 1
    index(3) = index(3) + 1
    index(4) = index(4) + 1
 
  end function nonlinear_index
 
  pure function index_is_on_facet(i, j, k, lx, ly, lz, facet) result(is_on)
    integer, intent(in) :: i, j, k, lx, ly, lz, facet
    logical :: is_on
 
    is_on = .false.
    select case (facet)
      case (1)
       if (i .eq. 1) is_on = .true.
      case (2)
       if (i .eq. lx) is_on = .true.
      case (3)
       if (j .eq. 1) is_on = .true.
      case (4)
       if (j .eq. ly) is_on = .true.
      case (5)
       if (k .eq. 1) is_on = .true.
      case (6)
       if (k .eq. lz) is_on = .true.
    end select
 
  end function index_is_on_facet
 
  subroutine neko_error_plain(error_code)
    integer, optional :: error_code
 
    if (present(error_code)) then
       write(error_unit, *) '*** ERROR ***', error_code
       error stop
    else
       write(error_unit, *) '*** ERROR ***'
       error stop
    end if
 
  end subroutine neko_error_plain
 
  subroutine neko_error_msg(error_msg)
    character(len=*) :: error_msg
    write(error_unit, *) '*** ERROR: ', error_msg, ' ***'
    error stop
  end subroutine neko_error_msg
 
  subroutine neko_type_error(base_type, wrong_type, known_types)
    character(len=*) :: base_type 
    character(len=*) :: wrong_type 
    character(len=*) :: known_types(:)
    integer :: i
 
    write(error_unit, *) '*** ERROR WHEN SELECTING TYPE ***'
    write(error_unit, *) 'Type ', wrong_type, ' does not exist for ', base_type
    write(error_unit, *) 'Valid types are:'
    do i = 1, size(known_types)
       write(error_unit, *) "    ", known_types(i)
    end do
    error stop
  end subroutine neko_type_error
 
  subroutine neko_warning(warning_msg)
    character(len=*) :: warning_msg
    write(output_unit, *) '*** WARNING: ', warning_msg, ' ***'
  end subroutine neko_warning
 
  function concat_string_array(array, sep, prepend) result(result)
    character(len=*), intent(in) :: array(:)
    character(len=*), intent(in) :: sep
    logical, intent(in) :: prepend
    character(:), allocatable :: result
    integer :: i
 
    result = trim(array(1))
    do i = 2, size(array)
       result = result // sep // trim(array(i))
    end do
 
    if (prepend .eqv. .true.) then
       result = sep // result
    end if
 
  end function concat_string_array
 
end module utils