lib/dom/examples/checker.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # This file is free software, which comes along with NIT.  This software is
   4 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
   5 # without  even  the implied warranty of  MERCHANTABILITY or  FITNESS FOR A
   6 # PARTICULAR PURPOSE.  You can modify it is you want,  provided this header
   7 # is kept unaltered, and a notification of the changes is added.
   8 # You  are  allowed  to  redistribute it and sell it, alone or is a part of
   9 # another product.
  10
  11 # Simple XML validity checker using the `dom` module
  12 module checker
  13
  14 import dom
  15
  16 # Check arguments
  17 if args.length != 1 then
  18         print_error "Usage: checker xml_file"
  19         exit 2
  20 end
  21
  22 var path = args.first
  23 if not path.file_exists then
  24         print_error "Path '{path}' does not exist"
  25         exit 3
  26 end
  27
  28 # Read file
  29 var content = path.to_path.read_all
  30
  31 # Parse XML
  32 var xml = content.to_xml
  33
  34 # Check for errors
  35 if xml isa XMLError then
  36         print_error "XML file at '{path}' is invalid:"
  37         print_error xml.message
  38         var loc = xml.location
  39         if loc != null then print_error loc
  40         exit 1
  41 else
  42         print "XML file at '{path}' is valid"
  43 end