#! /usr/bin/env python
#
def s_to_rot13 ( s1 ):

#*****************************************************************************80
#
## S_TO_ROT13 "rotates" the alphabetical characters in a string by 13 positions.
#
#  Discussion:
#
#    Two applications of the routine will return the original string.
#
#  Examples:
#
#    Input:                      Output:
#
#    abcdefghijklmnopqrstuvwxyz  nopqrstuvwxyzabcdefghijklm
#    Cher                        Pure
#    James Thurston Howell       Wnzrf Guhefgba Ubjryy
#    0123456789                  56789012345
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#   30 January 2016
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, string S1, a string to be "rotated".
#
#    Output, string S2, the rotated string.
#
  from ch_to_rot13 import ch_to_rot13

  s1_length = len ( s1 )
  s2 = ''

  for i in range ( 0, s1_length ):
    s2 = s2 + ch_to_rot13 ( s1[i] )
 
  return s2

def s_to_rot13_test ( ):

#*****************************************************************************80
#
## S_TO_ROT13_TEST tests S_TO_ROT13.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    30 January 2016
#
#  Author:
#
#    John Burkardt
#
  import platform
  from s_quote import s_quote

  print ( '' )
  print ( 'S_TO_ROT13_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  S_TO_ROT13 applies the ROT13 cipher to a string.' )

  print ( '' )
  print ( '  S2 = S_TO_ROT13 ( S1 ).' )
  print ( '' )
  print ( '  -------------------S1-------------------  -------------------S2-------------------' )
  print ( '' )

  s1 = 'abcdefghijklmnopqrstuvwxyz'
  s2 = s_to_rot13 ( s1 )
  s1 = s_quote ( s1, '"' )
  s2 = s_quote ( s2, '"' )
  print ( '  %-40s  %-40s' % ( s1, s2 ) )

  s1 = 'Cher'
  s2 = s_to_rot13 ( s1 )
  s1 = s_quote ( s1, '"' )
  s2 = s_quote ( s2, '"' )
  print ( '  %-40s  %-40s' % ( s1, s2 ) )

  s1 = 'James Thurston Howell III'
  s2 = s_to_rot13 ( s1 )
  s1 = s_quote ( s1, '"' )
  s2 = s_quote ( s2, '"' )
  print ( '  %-40s  %-40s' % ( s1, s2 ) )

  s1 = 'The bill is $1,205,837.49 so pay now!'
  s2 = s_to_rot13 ( s1 )
  s1 = s_quote ( s1, '"' )
  s2 = s_quote ( s2, '"' )
  print ( '  %-40s  %-40s' % ( s1, s2 ) )

  print ( '' )
  print ( '  S2 = S_TO_ROT13 ( S1 ).' )
  print ( '  S3 = S_TO_ROT13 ( S2 ).' )
  print ( '' )
  print ( '  -------------------S1-------------------  -------------------S3-------------------' )
  print ( '' )

  s1 = 'abcdefghijklmnopqrstuvwxyz'
  s2 = s_to_rot13 ( s1 )
  s3 = s_to_rot13 ( s2 )
  s1 = s_quote ( s1, '"' )
  s3 = s_quote ( s3, '"' )
  print ( '  %-40s  %-40s' % ( s1, s3 ) )

  s1 = 'Cher'
  s2 = s_to_rot13 ( s1 )
  s3 = s_to_rot13 ( s2 )
  s1 = s_quote ( s1, '"' )
  s3 = s_quote ( s3, '"' )
  print ( '  %-40s  %-40s' % ( s1, s3 ) )

  s1 = 'James Thurston Howell III'
  s2 = s_to_rot13 ( s1 )
  s3 = s_to_rot13 ( s2 )
  s1 = s_quote ( s1, '"' )
  s3 = s_quote ( s3, '"' )
  print ( '  %-40s  %-40s' % ( s1, s3 ) )

  s1 = 'The bill is $1,205,837.49 so pay now!'
  s2 = s_to_rot13 ( s1 )
  s3 = s_to_rot13 ( s2 )
  s1 = s_quote ( s1, '"' )
  s3 = s_quote ( s3, '"' )
  print ( '  %-40s  %-40s' % ( s1, s3 ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'S_TO_ROT13_TEST:' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  s_to_rot13_test ( )
  timestamp ( )