Manual Reference Pages - HTML_SCORE (1)
"html_score" - Show complexity metric and other stats for web page
html_score [--html] [uri|file]
html_score --html http://perl6.org
Given a URI or a file name,
treats its referent as HTML
and prints a complexity metric,
the maximum element depth, and per-element statistics.
The per-element statistics appear in rows, one per tag name.
For each tag name, its row contains:
The argument to html_score can be either a URI or a file
name. If it starts with alphanumerics followed by a colon, it is treated
as a URI. Otherwise it is treated as file name.
If the --html option is specified, the output is written
as an HTML table.
The maximum nesting depth of elements with
that tag name.
This is per-tag-name nesting depth,
and does not take
into account nesting within other elements with
other tag names.
A count of the elements with that tag name in the document.
The total number of characters in elements with that tag name.
Characters in nested elements are counted multiple times.
For example, if a page contains a table within a table,
characters in the inner table will be counted twice.
The average size of elements with this tag name, in characters.
The complexity metric is the average depth (or nesting level), in elements, of a character,
divided by the logarithm of the length of the HTML.
Whitespace and comments are ignored in calculating the complexity metric.
The division by the logarithm of the HTML length is based on the idea that,
all else being equal,
it is reasonable for the nesting to increase logarithmically as
a web page grows in length.
Here is the first part of the output for http://perl.org.
Complexity Score = 0.873
Maximum Depth = 12
Maximum Number of Size in Average
Element Nesting Elements Characters Size
a 1 56 3533 63
body 1 1 7615 7615
div 5 30 24695 823
em 1 1 13 13
h1 1 1 37 37
h4 1 11 559 50
INTERPRETING THE COMPLEXITY METRIC
the complexity metric can be used as a self-assessment
of website quality.
Well designed websites often have low numbers,
particularly if fast loading is an important goal.
But high values of the complexity metric do not necessarily mean low quality.
Everything depends on what the mission is, and how well
complexity is being used to serve the sites mission.
This program is a demo of a demo.
It purpose is to show how easy it is to write applications which look
at the structure of web pages using Marpa::HTML.
And the purpose of Marpa::HTML
is to demonstrate the power of its parse engine,
Marpa::HTML was written in a few days,
and its logic
is a straightforward,
natural expression of the structure of HTML.
The starting template for this code was
HTML::TokeParser, by Gisle Aas.
See also the
acknowledgments for Marpa as a whole.
LICENSE AND COPYRIGHT
Copyright 2007-2010 Jeffrey Kegler, all rights reserved.
Marpa is free software under the Perl license.
For details see the LICENSE file in the Marpa distribution.
|perl v5.20.3 ||HTML_SCORE (1) ||2016-04-05 |
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