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

comment on

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

I keep thinking that this can be done using string-wise boolean operations, but I cannot see how?

Like this:

sub compatible { my( $l, $r ) = @_; # underscores are insignificant tr/_/\0/ for $l, $r; # cancel out identical values my $xor = $l ^ $r; # convert to bitmasks tr/\0/\377/c for $l, $r; my $mask = $l & $r; # masked chars must be identical return !1 if ( $xor & $mask ) =~ tr/\0//c; # and there may not be dupes of non-identical characters return 0 == grep { my $char = substr( $xor, $_, 1 ); $char ne "\0" and index( $xor, $char, $_ + 1 ) != -1 } 0 .. length( $xor ) - 1; }

Test suite in the readmore.

#!/usr/bin/perl use strict; use warnings; use Test::More; my @testcase = ( 1 => [ '_8__3__19', '48____7__', ], 1 => [ '_8__3__19', '48__3_7__', ], !1 => [ '_8__3__19', '4_8___7__', ], !1 => [ '____3__19', '3________', ], !1 => [ '____3__19', '________8', ], !1 => [ '_8__3__19', '48_____7_', ], !1 => [ '__8_3__19', '84____7__', ], ); plan tests => @testcase / 2; while( my( $result, $strings ) = splice @testcase, 0, 2 ) { my $testname = join "\n" . ( " " x 18 ), ( ( $result ? 'compatible' : 'conflicting' ) . ':', @$strings ); is( compatible( @$strings ), $result, $testname ); }

Makeshifts last the longest.


In reply to Re: Comparison by position and value by Aristotle
in thread Comparison by position and value by BrowserUk

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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 chilling in the Monastery: (2)
    As of 2020-10-21 02:26 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      My favourite web site is:












      Results (212 votes). Check out past polls.

      Notices?