Instead of just removing an empty node, convert it to an '&nbsp' for …

[wheelerlaw]

…when dynamically prettifying code.

When prettifying code that has been dynamically inserted into the <pre> block when line numbering is enabled, blank lines (only consisting of a newline and/or carriage return) are erroneously removed from the DOM, when they should actually be preserved and converted into &nbsp elements to prevent browsers from not displaying them, which causes inconsistencies with the line numbering. Here is an example:

Original python script:

# Script Name   : test.py
# Author        : Wheeler Law
# Created       : 2 March 2016
# Last Modified : 
# Version       : 1.0

# Modifications : 

# Description   : Sample python script to test the script uploader/syntax highlighter. 

import sys      # Import the Modules
import os       # Import the Modules

# Readfile Functions which open the file that is passed to the script

def readfile(filename):
    line = open(filename, 'r').read()
    print line

def main():
  if len(sys.argv) == 2:        # Check the arguments passed to the script
    filename = sys.argv[1]      # The filename is the first argument
    if not os.path.isfile(filename):    # Check the File exists
      print '[-] ' + filename + ' does not exist.'
      exit(0)
    if not os.access(filename, os.R_OK):    # Check you can read the file
      print '[-] ' + filename + ' access denied'
      exit(0)
  else:
    print '[-] Usage: ' + str(sys.argv[0]) + ' <filename>' # Print usage if not all parameters passed/Checked
    exit(0)
  print '[+] Reading from : ' + filename    # Display Message and read the file contents
  readfile(filename)

if __name__ == '__main__':
  main()

This is the output:

You'll notice that the lines in the script that do not have any content in them are removed from the DOM, which causes inconsistencies with the line numbering.

[amroamroamro]

I can't reproduce the problem described. Here are two examples that highlight code dynamically inserted:

• using prettyPrint: https://jsfiddle.net/amroamroamro/39uxqgvm/
• using prettyPrintOne: https://jsfiddle.net/amroamroamro/pch5hwd1/

Both working fine with correct line numbers.