jf_test_1.f90 Source File

!*****************************************************************************************
!>
! Module for the first unit test.
!
!# HISTORY
!  * Izaak Beekman : 2/18/2015 : Created (refactoried original json_example.f90 file)

module jf_test_1_mod

    use json_module
    use, intrinsic :: iso_fortran_env , only: error_unit, output_unit, wp => real64

    implicit none

    character(len=*),parameter :: dir = '../files/inputs/'    !! working directory
    character(len=*),parameter :: filename1 = 'test1.json'

contains

    subroutine test_1(error_cnt)

    !! Read a sample JSON file and retrieve some data from it

    implicit none

    integer,intent(out) :: error_cnt
    type(json_file) :: json    !the JSON structure read from the file:
    integer :: ival
    character(kind=CK,len=:),allocatable :: cval
    real(wp) :: rval
    logical :: found
    type(json_value),pointer :: p

    error_cnt = 0
    call json_initialize()
    if (json_failed()) then
      call json_print_error_message(error_unit)
      error_cnt = error_cnt + 1
    end if

    write(error_unit,'(A)') ''
    write(error_unit,'(A)') '================================='
    write(error_unit,'(A)') '   TEST 1'
    write(error_unit,'(A)') '================================='
    write(error_unit,'(A)') ''

    ! parse the json file:
    write(error_unit,'(A)') ''
    write(error_unit,'(A)') 'parsing file '//dir//filename1

    call json%load_file(filename = dir//filename1)

    if (json_failed()) then    !if there was an error reading the file

      call json_print_error_message(error_unit)
      error_cnt = error_cnt + 1

    else

      ! print the parsed data to the console
      write(error_unit,'(A)') ''
      write(error_unit,'(A)') 'printing the file...'
      write(output_unit,'(A)') '{ "part a" :' !Wrap 3 outputs to make stdout valid json
      call json%print_file()
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      ! extract data from the parsed value
      write(error_unit,'(A)') ''
      write(error_unit,'(A)') 'get some data from the file...'

      write(error_unit,'(A)') ''
      call json%get('version.svn', ival)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A,I5)') 'version.svn = ',ival
      end if

      write(error_unit,'(A)') ''
      call json%get('data(1).array(2)', cval)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A)') 'data(1).array(2) = '//trim(cval)
      end if

      write(error_unit,'(A)') ''
      call json%get('files(1)', cval)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A)') 'files(1) = '//trim(cval)
      end if

      write(error_unit,'(A)') ''
      call json%get('files(2)', cval)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A)') 'files(2) = '//trim(cval)
      end if

      write(error_unit,'(A)') ''
      call json%get('files(3)', cval)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A)') 'files(3) = '//trim(cval)
      end if

      write(error_unit,'(A)') ''
      call json%get('data(2).real', rval)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A,E30.16)') 'data(2).real = ',rval
      end if

      write(error_unit,'(A)') ''
      call json%get('files[4]', cval)      !has hex characters
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A)') 'files[4] = '//trim(cval)
      end if

      write(error_unit,'(A)') ''
      call json%get('files[5]', cval)      !string with spaces and no escape characters
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      else
        write(error_unit,'(A)') 'files[5] = '//trim(cval)
      end if

      !
      ! Test of values that aren't there:
      ! Note: when using the "found" output, the exceptions are cleared automatically.
      !

      write(error_unit,'(A)') ''
      call json%get('files[10]', cval, found)      !value that isn't there
      if (.not. found) then
        write(error_unit,'(A)') 'files[10] not in file.'
      else
        write(error_unit,'(1x,A)') 'files[10] = '//trim(cval)
        error_cnt = error_cnt + 1
      end if

      write(error_unit,'(A)') ''
      call json%get('version.blah', ival, found)      !value that isn't there
      if (.not. found) then
        write(error_unit,'(A)') 'version.blah not in file.'
      else
        write(error_unit,'(A)') 'version.blah = ',ival
        error_cnt = error_cnt + 1
      end if

      write(error_unit,'(A)') ''
      write(error_unit,'(A)') ' Test removing data from the json structure:'

      call json%get('files', p)         !in the middle of a list
      call json_remove(p)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      call json%get('data(1).array', p)   !at the end of a list
      call json_remove(p)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      call json%get('data(2).number', p)  !at the beginning of a list
      call json_remove(p)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      write(error_unit,'(A)') ''
      write(error_unit,'(A)') 'printing the modified structure...'
      write(output_unit,'(A)') ', "part b" : '
      call json%print_file()
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      write(error_unit,'(A)') ''
      write(error_unit,'(A)') ' Test replacing data from the json structure:'

      call json%get('data(1)', p)
      call json_update(p,'name','Cuthbert',found)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      !call json%get('data(2)', p)
      !call json_update(p,'real',[1.0_wp, 2.0_wp, 3.0_wp],found)   !don't have one like this yet...

      !use the json_file procedure to update a variable:
      call json%update('version.svn',999,found)
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

      write(error_unit,'(A)') ''
      write(error_unit,'(A)') 'printing the modified structure...'
      write(output_unit,'(A)') ', "part c" : '
      call json%print_file()
      write(output_unit,'(A)') '}'
      if (json_failed()) then
        call json_print_error_message(error_unit)
        error_cnt = error_cnt + 1
      end if

    end if

    ! clean up
    write(error_unit,'(A)') ''
    write(error_unit,'(A)') 'destroy...'
    call json%destroy()
    if (json_failed()) then
      call json_print_error_message(error_unit)
      error_cnt = error_cnt + 1
    end if

    end subroutine test_1

end module jf_test_1_mod
!*****************************************************************************************

!*****************************************************************************************
program jf_test_1

    !! First unit test.
    
    use jf_test_1_mod , only: test_1
    implicit none
    integer :: n_errors
    n_errors = 0
    call test_1(n_errors)
    if (n_errors /= 0) stop 1
    
end program jf_test_1
!*****************************************************************************************