HTML::Diff - phpMan

HTML::Diff(3pm) User Contributed Perl Documentation HTML::Diff(3pm)

NAME
HTML::Diff - compare two HTML strings and return a list of differences

SYNOPSIS
use HTML::Diff;

$result = html_word_diff($left_text, $right_text);

DESCRIPTION
This module compares two strings of HTML and returns a list of a chunks which indicate the
diff between the two input strings, where changes in formatting are considered changes.

HTML::Diff does not strictly parse the HTML. Instead, it uses regular expressions to make
a decent effort at understanding the given HTML. As a result, there are many valid HTML
documents for which it will not produce the correct answer. But there may be some invalid
HTML documents for which it gives you the answer you're looking for. Your mileage may
vary; test it on lots of inputs from your domain before relying on it.

Returns a reference to a list of triples [<flag>, <left>, <right>]. Each triple
represents a check of the input texts. The flag tells you whether it represents a
deletion, insertion, a modification, or an unchanged chunk.

Every character of each input text is accounted for by some triple in the output.
Specifically, Concatenating all the <left> members from the return value should produce
$left_text, and likewise the <right> members concatenate together to produce $right_text.

The <flag> is either 'u', '+', '-', or 'c', indicating whether the two chunks are the
same, the $right_text contained this chunk and the left chunk didn't, or vice versa, or
the two chunks are simply different. This follows the usage of Algorithm::Diff.

The difference is computed on a word-by-word basis, "breaking" on visible words in the
HTML text. If a tag only is changed, it will not be returned as an independent chunk but
will be shown as a change to one of the neighboring words. For balanced tags, such as <b>
</b>, it is intended that a change to the tag will be treated as a change to all words in
between.

SEE ALSO
Algorithm::Diff provides the diff algorithm used in this module.

XML::Diff can generate a diff between two XML files, and also patch an XML file, given a
diff.

REPOSITORY
<https://github.com/neilb/html-diff>

AUTHOR
Whipped up by Ezra elias kilty Cooper, <ezra AT ezrakilty.net>.

Patch contributed by Adam <asjo AT koldfront.dk>.

This program is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.

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