MKDoc::XML::Tokenizer(3) Tokenize XML the REX way


my $tokens = MKDoc::XML::Tokenizer->process_data ($some_xml);
foreach my $token (@{$tokens})
print "'" . $token->as_string() . "' is text\n" if (defined $token->text());
print "'" . $token->as_string() . "' is a self closing tag\n" if (defined $token->tag_self_close());
print "'" . $token->as_string() . "' is an opening tag\n" if (defined $token->tag_open());
print "'" . $token->as_string() . "' is a closing tag\n" if (defined $token->tag_close());
print "'" . $token->as_string() . "' is a processing instruction\n" if (defined $token->pi());
print "'" . $token->as_string() . "' is a declaration\n" if (defined $token->declaration());
print "'" . $token->as_string() . "' is a comment\n" if (defined $token->comment());
print "'" . $token->as_string() . "' is a tag\n" if (defined $token->tag());
print "'" . $token->as_string() . "' is a pseudo-tag (NOT text and NOT tag)\n" if (defined $token->pseudotag());
print "'" . $token->as_string() . "' is a leaf token (NOT opening tag)\n" if (defined $token->leaf());


MKDoc::XML::Tokenizer is a module which uses Robert D. Cameron REX technique to parse XML (ignore the carriage returns):

  *]+(?:[^\]>][^\]]*](?:[^\]]+])*]+)*>)?|DOCTYPE(?:[ \n\t\r]+(?:[A-Za-z_:]|[^\
  x00-\x7F])(?:[A-Za-z0-9_:.-]|[^\x00-\x7F])*(?:[ \n\t\r]+(?:(?:[A-Za-z_:]|[^\
  x00-\x7F])(?:[A-Za-z0-9_:.-]|[^\x00-\x7F])*|"[^"]*"|'[^']*'))*(?:[ \n\t\r]+)
  n\r\t ][^?]*\?+(?:[^>?][^?]*\?+)*>))|%(?:[A-Za-z_:]|[^\x00-\x7F])(?:[A-Za-z0
  -9_:.-]|[^\x00-\x7F])*;|[ \n\t\r]+)*](?:[ \n\t\r]+)?)?>?)?)?|\?(?:(?:[A-Za-z
  _:]|[^\x00-\x7F])(?:[A-Za-z0-9_:.-]|[^\x00-\x7F])*(?:\?>|[\n\r\t ][^?]*\?+(?
  00-\x7F])*(?:[ \n\t\r]+)?>?)?|(?:(?:[A-Za-z_:]|[^\x00-\x7F])(?:[A-Za-z0-9_:.
  -]|[^\x00-\x7F])*(?:[ \n\t\r]+(?:[A-Za-z_:]|[^\x00-\x7F])(?:[A-Za-z0-9_:.-]|
  [^\x00-\x7F])*(?:[ \n\t\r]+)?=(?:[ \n\t\r]+)?(?:"[^<"]*"|'[^<']*'))*(?:[ \n\

That's right. One big regex, and it works rather well.


This module does low level XML manipulation. It will somehow parse even broken XML and try to do something with it. Do not use it unless you know what you're doing.


my $tokens = MKDoc::XML::Tokenizer->process_data ($some_xml);

Splits $some_xml into a list of MKDoc::XML::Token objects and returns an array reference to the list of tokens.

my $tokens = MKDoc::XML::Tokenizer->process_file ('/some/file.xml');

Same as MKDoc::XML::Tokenizer->process_data ($some_xml), except that it reads $some_xml from '/some/file.xml'.


MKDoc::XML::Tokenizer works with MKDoc::XML::Token, which can be used when building a full tree is not necessary. If you need to build a tree, look at MKDoc::XML::TreeBuilder.


Copyright 2003 - MKDoc Holdings Ltd.

Author: Jean-Michel Hiver

This module is free software and is distributed under the same license as Perl itself. Use it at your own risk.