Re: filter to break urls in HTML

[BP Jonsson <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

Den 2014-12-17 21:56, Pablo Rodríguez skrev:
> I would need a filter that parses the following url:
> 
>      <http://www.link.com#a=b.php?what>
> 
> in HTML as:
> 
>      <a href="http://www.link.com#a=b.php?what">http://&#8203;
>      www&#8203;.&#8203;link&#8203;.&#8203;com&#8203;#&#8203;a&#8203;=
>      &#8203;b&#8203;.&#8203;php&#8203;?&#8203;what</a>

Are you not afraid that someone who copypastes that URL will get angry at you? :-)

Actually I wrote such a filter in Perl just for kicks since I ralized that the main action could be compacted into a single substitution:

    $_->{c}[0][0]{c} =~ s{ (^.+?://) | (?= [^-:a-z0-9%] ) | (?<= [-:] ) }{ $1 || "\x{200b}" }egix;

I figured that I would like to have breaks after hyphens and colons but before other punctuation, except for percent-encoded characters/bytes where I wouldn't want any breaks at all, hence the three-way alternation in the search pattern. 

BTW Matthew, isnt `nb = '\x8203'` in your Haskell version a mistake. Codepoint 8203 *hex* is U+8203 CJK UNIFIED IDEOGRAPH-8203 while 8203 *decimal* is U+200B ZERO WIDTH SPACE!

/bpj

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