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POPerl Unicode internals - mess with utf8
 

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  1. POPerl Unicode internals - mess with utf8
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    <p>Before anyone will tells me to RTFM, I must say - I have digged through:</p> <ul> <li><a href="https://stackoverflow.com/questions/6162484/why-does-modern-perl-avoid-utf-8-by-default">Why does modern Perl avoid UTF-8 by default?</a></li> <li><a href="https://stackoverflow.com/q/3735721/632407">Checklist for going the Unicode way with Perl</a></li> <li><a href="https://stackoverflow.com/questions/7429964/how-to-match-string-with-diacritic-in-perl">How to match string with diacritic in perl?</a></li> <li><a href="https://stackoverflow.com/questions/6412799/perl-how-to-make-use-mydefaults-with-modern-perl-utf8-defaults">How to make &quot;use My::defaults&quot; with modern perl &amp; utf8 defaults?</a></li> <li>and many others (like <a href="http://perldoc.perl.org/perluniintro.html" rel="nofollow noreferrer">perluniintro</a> and others) - but - <em>sure</em>, missed something</li> </ul> <p>So, the basic code:</p> <pre><code>use 5.014; #getting 'unicode_strings' feature use uni::perl; #turning on many utf8 things use Unicode::Normalize qw(NFD NFC); use warnings; while(&lt;&gt;) { chomp; my $data = NFD($_); say "OK" if utf8::is_utf8($data); } </code></pre> <p>At this point, <em>from</em> the <em>utf8</em> encoded STDIN I got a correct <em>unicode</em> string in <code>$data</code>, e.g. "\w" will match multibyte <code>[\p{Alphabetic}\p{Decimal_Number}\p{Letter_Number}]</code> (maybe something more). That's ok and works.</p> <p>AFAIK <code>$data</code> does <strong>not</strong> contain utf8, but a string in <code>perl's internal Unicode</code> format.</p> <p>Now the questions:</p> <ul> <li>HOW can I ensure (test it), that any <code>$other_data</code> contains valid Unicode string?</li> <li>For what purpose is the utf8::is_utf8($data)? The whole <a href="http://perldoc.perl.org/utf8.html" rel="nofollow noreferrer">utf8</a> pragma is a mystery for me.</li> </ul> <p>I understand that the <code>use utf8;</code> is only for the purpose of telling Perl that my source code is in utf8 (so do similar things as when my script starts with BOM flag - for BigEndian) - from Perl's point of view, my source code is like an external file - and Perl should know in what encoding it is...</p> <p>In the above example <code>utf8::is_utf8($data)</code> will print OK - but I don't understand WHY.</p> <p>Internally Perl does not use utf8, so my utf8 data-file is converted into Perl's internal Unicode, so why does the <code>utf8::is_utf8($data)</code> return true for <code>$data</code>, which is <em>not</em> in utf8 format? Or it is misnamed and the function should be named as uni::is_unicode($data)???</p> <p>Thanks in advance for clarification.</p> <p>Ps: @brian d foy - yes, I still don't have the <em>Effective Perl Programming</em> book - I will get it - I promise :) /joking/</p>
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