Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

The synopsis for Unicode::Collate does a reasonable job of setting the stage, but there is a nice discussion in chapter 6 of Programming Perl (the camel book), 4th edition as well. You might also look at the Unicode Technical Standard #10: Unicode Collation Algorithm.

Here's a brief example of doing comparisons at a lower (more relaxed) level using Unicode::Collate.

use strict;
use warnings FATAL => 'utf8';
use utf8;

use Unicode::Collate;
binmode STDOUT, ':encoding(UTF-8)';

my( $x, $y, $z ) = qw( α ά ὰ );

my $c = Unicode::Collate->new;

print "\nStrict collation rules: Level 4 (default)\n";
print "\t cmp('α','ά'): ", $c->cmp( $x, $y ), "\n";
print "\t cmp('ά','ὰ'): ", $c->cmp( $y, $z ), "\n";
print "\t cmp('α','ὰ'): ", $c->cmp( $x, $z ), "\n";

my $rc = Unicode::Collate->new( level => 1 );

print "\nRelaxed collation rules: Level 1\n";
print "\t cmp('α','ά'): ", $rc->cmp( $x, $y ), "\n";
print "\t cmp('ά','ὰ'): ", $rc->cmp( $y, $z ), "\n";
print "\t cmp('α','ὰ'): ", $rc->cmp( $x, $z ), "\n\n";

And the output...


Strict collation rules: Level 4 (default)
	 cmp('α','ά'): -1
	 cmp('ά','ὰ'): -1
	 cmp('α','ὰ'): -1

Relaxed collation rules: Level 1
	 cmp('α','ά'): 0
	 cmp('ά','ὰ'): 0
	 cmp('α','ὰ'): 0

And if the reason for doing comparisons is to handle sorting, Unicode::Collate does that too (you don't need to explicitly use Perl's core sort).


Dave


In reply to Re^3: getting Unicode character names from string by davido
in thread getting Unicode character names from string by csthflk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (4)
    As of 2014-07-24 02:46 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (156 votes), past polls