HTML::Clean(3) Cleans up HTML code for web browsers, not humans

SYNOPSIS


use HTML::Clean;
$h = new HTML::Clean($filename); # or..
$h = new HTML::Clean($htmlcode);

$h->compat();
$h->strip();
$data = $h->data();
print $$data;

DESCRIPTION

The HTML::Clean module encapsulates a number of common techniques for minimizing the size of HTML files. You can typically save between 10% and 50% of the size of a HTML file using these methods. It provides the following features:
Remove unneeded whitespace (beginning of line, etc)
Remove unneeded META elements.
Remove HTML comments (except for styles, javascript and SSI)
Replace tags with equivalent shorter tags (<strong> --> <b>)
etc.

The entire process is configurable, so you can pick and choose what you want to clean.

THE HTML::Clean CLASS

$h = new HTML::Clean($dataorfile, [$level]);

This creates a new HTML::Clean object. A Prerequisite for all other functions in this module.

The $dataorfile parameter supplies the input HTML, either a filename, or a reference to a scalar value holding the HTML, for example: 

  $h = new HTML::Clean("/htdocs/index.html");
  $html = "<strong>Hello!</strong>";
  $h = new HTML::Clean(\$html);

An optional 'level' parameter controls the level of optimization performed. Levels range from 1 to 9. Level 1 includes only simple fast optimizations. Level 9 includes all optimizations.

$h->initialize($dataorfile)

This function allows you to reinitialize the HTML data used by the current object. This is useful if you are processing many files.

$dataorfile has the same usage as the new method.

Return 0 for an error, 1 for success.

$h->level([$level])

Get/set the optimization level. $level is a number from 1 to 9.

$myref = $h->data()

Returns the current HTML data as a scalar reference.

strip(\%options);

Removes excess space from HTML

You can control the optimizations used by specifying them in the %options hash reference.

The following options are recognized:

boolean values (0 or 1 values)
  whitespace    Remove excess whitespace
  shortertags   <strong> -> <b>, etc..
  blink         No blink tags.
  contenttype   Remove default contenttype.
  comments      Remove excess comments.
  entities      &quot; -> ", etc.
  dequote       remove quotes from tag parameters where possible.
  defcolor      recode colors in shorter form. (#ffffff -> white, etc.)
  javascript    remove excess spaces and newlines in javascript code.
  htmldefaults  remove default values for some html tags
  lowercasetags translate all HTML tags to lowercase
parameterized values
  meta        Takes a space separated list of meta tags to remove, 
              default "GENERATOR FORMATTER"
  emptytags   Takes a space separated list of tags to remove when there is no
              content between the start and end tag, like this: <b></b>. 
              The default is 'b i font center'

Please note that if your HTML includes preformatted regions (this means, if it includes <pre>...</pre>, we do not suggest removing whitespace, as it will alter the rendered defaults.

HTML::Clean will print out a warning if it finds a preformatted region and is requested to strip whitespace. In order to prevent this, specify that you don't want to strip whitespace - i.e. 

  $h->strip( {whitespace => 0} );

compat()

This function improves the cross-platform compatibility of your HTML. Currently checks for the following problems:
Insuring all IMG tags have ALT elements.
Use of Arial, Futura, or Verdana as a font face.
Positioning the <TITLE> tag immediately after the <head> tag.

defrontpage();

This function converts pages created with Microsoft Frontpage to something a Unix server will understand a bit better. This function currently does the following:
Converts Frontpage 'hit counters' into a unix specific format.
Removes some frontpage specific html comments

Modules

FrontPage::Web, FrontPage::File

Web Sites

Distribution Site - http://people.itu.int/~lindner/

AUTHORS

Paul Lindner for the International Telecommunication Union (ITU)

COPYRIGHT

The HTML::Strip module is Copyright (c) 1998,99 by the ITU, Geneva Switzerland. All rights reserved.

You may distribute under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file.

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