file.f90

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! Copyright (c) 2019-2026, The Neko Authors
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module file
  use utils, only : neko_error, neko_warning, filename_suffix
  use num_types, only : rp
  use generic_file, only : generic_file_t
  use nmsh_file, only : nmsh_file_t
  use chkp_file, only : chkp_file_t
  use map_file, only : map_file_t
  use rea_file, only : rea_file_t
  use re2_file, only : re2_file_t
  use bp_file, only : bp_file_t
  use fld_file, only : fld_file_t
  use fld_file_data, only : fld_file_data_t
  use vtk_file, only : vtk_file_t
  use vtkhdf_file, only : vtkhdf_file_t
  use stl_file, only : stl_file_t
  use csv_file, only : csv_file_t
  use hdf5_file, only : hdf5_file_t
  implicit none
 
  type file_t
     class(generic_file_t), allocatable :: file_type
   contains
     procedure, pass (this) :: init => file_init
     procedure :: write => file_write
     procedure :: read => file_read
     procedure :: get_fname => file_get_fname
     procedure :: get_base_fname => file_get_base_fname
     procedure :: get_counter => file_get_counter
     procedure :: set_counter => file_set_counter
     procedure :: set_start_counter => file_set_start_counter
     procedure :: set_header => file_set_header
     procedure :: set_precision => file_set_precision
     procedure :: set_layout => file_set_layout
     procedure, pass (this) :: set_overwrite => file_set_overwrite
     procedure :: set_subdivide => file_set_subdivide
     procedure, pass(this) :: free => file_free
  end type file_t
 
contains
 
  subroutine file_init(this, fname, header, precision, layout, overwrite)
    class(file_t), intent(inout) :: this
    character(len=*), intent(in) :: fname
    character(len=*), intent(in), optional :: header
    integer, intent(in), optional :: precision
    integer, intent(in), optional :: layout
    logical, intent(in), optional :: overwrite
    character(len=80) :: suffix
 
    call filename_suffix(fname, suffix)
 
    if (allocated(this%file_type)) then
       deallocate(this%file_type)
    end if
 
    select case (trim(suffix))
    case ("rea")
       allocate(rea_file_t::this%file_type)
    case ("re2")
       allocate(re2_file_t::this%file_type)
    case ("map")
       allocate(map_file_t::this%file_type)
    case ("vtk")
       allocate(vtk_file_t::this%file_type)
    case ("nmsh")
       allocate(nmsh_file_t::this%file_type)
    case ("bp")
       allocate(bp_file_t::this%file_type)
    case ("fld")
       allocate(fld_file_t::this%file_type)
    case ("chkp")
       allocate(chkp_file_t::this%file_type)
    case ("stl")
       allocate(stl_file_t::this%file_type)
    case ("csv")
       allocate(csv_file_t::this%file_type)
       this%file_type%serial = .true.
    case ("hdf5", "h5")
       allocate(hdf5_file_t::this%file_type)
    case ("vtkhdf")
       allocate(vtkhdf_file_t::this%file_type)
    case default
       call neko_error('Unknown file format: "' // trim(suffix) // '"')
    end select
 
    call this%file_type%init(fname)
 
    if (present(header)) then
       call this%set_header(header)
    end if
 
    if (present(precision)) then
       call this%set_precision(precision)
    end if
 
    if (present(layout) .and. (suffix .eq. "bp")) then
       call this%set_layout(layout)
    end if
 
    if (present(overwrite)) then
       call this%set_overwrite(overwrite)
    end if
 
  end subroutine file_init
 
  subroutine file_free(this)
    class(file_t), intent(inout) :: this
 
    if (allocated(this%file_type)) then
       deallocate(this%file_type)
    end if
 
  end subroutine file_free
 
  subroutine file_write(this, data, t)
    class(file_t), intent(inout) :: this
    class(*), intent(inout) :: data
    real(kind=rp), intent(in), optional :: t
 
    call this%file_type%write(data, t = t)
 
  end subroutine file_write
 
  subroutine file_read(this, data)
    class(file_t), intent(in) :: this
    class(*), intent(inout) :: data
 
    call this%file_type%read(data)
 
  end subroutine file_read
 
  function file_get_fname(this) result(fname)
    class(file_t), intent(in) :: this
    character(len=1024) :: fname
 
    fname = ""
 
    select type (ft => this%file_type)
    class is (generic_file_t)
       fname = ft%get_fname()
    end select
 
  end function file_get_fname
 
  function file_get_base_fname(this) result(fname)
    class(file_t), intent(in) :: this
    character(len=1024) :: fname
 
    fname = ""
 
    select type (ft => this%file_type)
    class is (generic_file_t)
       fname = ft%get_base_fname()
    end select
 
  end function file_get_base_fname
 
  function file_get_counter(this) result(n)
    class(file_t), intent(inout) :: this
    integer :: n
    n = 0
 
    select type (ft => this%file_type)
    class is (generic_file_t)
       n = ft%get_counter()
    end select
 
  end function file_get_counter
 
  subroutine file_set_counter(this, n)
    class(file_t), intent(inout) :: this
    integer, intent(in) :: n
 
    select type (ft => this%file_type)
    class is (generic_file_t)
       call ft%set_counter(n)
    end select
 
  end subroutine file_set_counter
 
  subroutine file_set_start_counter(this, n)
    class(file_t), intent(inout) :: this
    integer, intent(in) :: n
 
    select type (ft => this%file_type)
    class is (generic_file_t)
       call ft%set_start_counter(n)
    end select
 
  end subroutine file_set_start_counter
 
  subroutine file_set_header(this, hd)
    class(file_t), intent(inout) :: this
    character(len=*), intent(in) :: hd
    character(len=80) :: suffix
 
    select type (ft => this%file_type)
    class is (csv_file_t)
       call ft%set_header(hd)
    class default
       call filename_suffix(this%file_type%get_fname(), suffix)
       call neko_warning("No set_header defined for " // trim(suffix) // " yet")
    end select
 
  end subroutine file_set_header
 
  subroutine file_set_precision(this, precision)
    class(file_t), intent(inout) :: this
    integer, intent(in) :: precision
    character(len=80) :: suffix
 
    select type (ft => this%file_type)
    type is (fld_file_t)
       call ft%set_precision(precision)
    type is (bp_file_t)
       call ft%set_precision(precision)
    type is (vtkhdf_file_t)
       call ft%set_precision(precision)
    class default
       call filename_suffix(this%file_type%get_fname(), suffix)
       call neko_warning("No precision strategy defined for " // trim(suffix) &
            // " files")
    end select
 
  end subroutine file_set_precision
 
  subroutine file_set_layout(this, layout)
    class(file_t), intent(inout) :: this
    integer, intent(in) :: layout
    character(len=80) :: suffix
 
    select type (ft => this%file_type)
    type is (bp_file_t)
       call ft%set_layout(layout)
    class default
       call filename_suffix(this%file_type%get_fname(), suffix)
       call neko_warning("No set_layout defined for " // trim(suffix) // " yet")
    end select
 
  end subroutine file_set_layout
 
  subroutine file_set_overwrite(this, overwrite)
    class(file_t), intent(inout) :: this
    logical, intent(in) :: overwrite
    character(len=80) :: suffix
 
    select type (ft => this%file_type)
    class is (generic_file_t)
       call ft%set_overwrite(overwrite)
    end select
  end subroutine file_set_overwrite
 
  subroutine file_set_subdivide(this, subdivide)
    class(file_t), intent(inout) :: this
    logical, intent(in) :: subdivide
    character(len=80) :: suffix
 
    select type (ft => this%file_type)
    type is (vtkhdf_file_t)
       call ft%set_subdivide(subdivide)
    class default
       if (subdivide) then
          call filename_suffix(this%file_type%get_fname(), suffix)
          call neko_warning("Subdivide output not supported for " // &
               trim(suffix) // " files")
       end if
    end select
  end subroutine file_set_subdivide
 
end module file