new_contents: #!/usr/bin/python
  #    Copyright 2017 Dhvani Patel
  #
  #    This file is part of UnnaturalCode.
  #    
  #    UnnaturalCode is free software: you can redistribute it and/or modify
  #    it under the terms of the GNU Affero General Public License as published by
  #    the Free Software Foundation, either version 3 of the License, or
  #    (at your option) any later version.
  #
  #    UnnaturalCode is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU Affero General Public License for more details.
  #
  #    You should have received a copy of the GNU Affero General Public License
  #    along with UnnaturalCode.  If not, see <http://www.gnu.org/licenses/>.
  
  # Takes in a string of JavaScript code and checks for errors
  # NOTE: FOR BABEL
  
  import os
  import subprocess
  import sys
  import tempfile
  from compile_error import CompileError
  
  
  # Method for finding index of certain characters in a string, n being the n'th occurence of the character/string
  def find_nth(haystack, needle, n):
      start = haystack.find(needle)
      while start >= 0 and n > 1:
          start = haystack.find(needle, start+len(needle))
          n -= 1
      return start	
  
  # Main method
  def checkBabelSyntax(src):
  		myFile = open("toCheck.js", "w")
  		myFile.write(src)
  		myFile.close()
  		proc = subprocess.Popen(['node_modules/.bin/babel', 'toCheck.js', '-o', '/dev/null'], stderr=subprocess.PIPE)
  		streamdata, err = proc.communicate()
  		rc = proc.returncode
  		if rc == 0:
  			# No errors, all good
  			os.remove("toCheck.js")
  			return None
  		else:
  			# Error, disect data for constructor		
  			colonFirInd = find_nth(err, ':', 1)
  			colonSecInd = find_nth(err, ':', 2)
  			colonThirInd = find_nth(err, ':', 3)		
  			lineBegin = find_nth(err, '(', 1)		
  			lineEnd = find_nth(err, ')', 1)	
  
  			fileName = err[colonFirInd+2:colonSecInd]
  			line = int(err[lineBegin+1:colonThirInd])
  			column = int(err[colonThirInd+1:lineEnd])
  
  			errorname = err[0:colonFirInd]
  
  			flagStart = find_nth(err, '>', 1)
  
  			temp = err[flagStart:]
  			ind = find_nth(temp, '\n', 1)
  
  			textBefore = err[colonSecInd+2:lineBegin-1]
  			textAfter = err[flagStart+26:flagStart+ind]
  			text = textBefore + ' ' + textAfter
  			
  			errorObj = CompileError(fileName, line, column, None, text, errorname)
  			os.remove("toCheck.js")
  			return [errorObj]	
  
  
subject: Add check_babel_syntax ; see extended note