Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Wow, so many answers already. :-)

The best way to find out if this should be a separate module is probably to let you guys decide, so here's the code...
This code parses some special list markup (similar to Wiki markup).
The scalarref ($text) is directly modified (I don't want to copy it and go $$text = $newtext).
If I wanted to write another parser function which does even more complicated modifications (which cannot be replaced by a regex), I'd have some duplicate code if this loop was not a separate module.
I know this isn't the prettiest piece of code mankind has written, but it seems to work (even with 3 byte UTF-8 characters / note that the line length changes).
I'd be happy if you could help me improve my code (even if there's a one-line alternative).

sub parseLists { my $self = shift; my $text = \$self->{_text}; # So we want to loop through the text line by line # and be able to modify some lines, # but we don't want to rebuild/copy the whole text. my $lf = "\n"; # linebreak my $lflen = length $lf; # 1 my $pos1 = 0; # left line offset my $pos2 = 0; # right line offset (1st char after line) my $len = 0; # line length my $lendif = 0; # line length difference my $inlist; open my $fh, "<:utf8", $text; # Note how we open in UTF-8 mode # while (<$fh>) # Gets confused when line length changes # Using seek() is risky, because it reads bytes, not chars! # However, substr() always counts chars, not bytes. while (<$fh>) { # Get line string without newline character my $line = substr $_, 0, -$lflen; my $oldline = $line; # Calculate offsets $len = length $line; $pos1 = $pos2; $pos2 += $len + $lflen; # Modify line # START (not part of loop structure) my $isasterisk = $line =~ m/^\* /; my $isindented = $line =~ m/^\ /; my $isfirst; if (!$inlist) { if ($isasterisk) { $isfirst = 1; $inlist = 1; } } if ($inlist) { if (!$isindented && !$isasterisk) { substr $line, 0, 0, "</ul>\n"; $inlist = 0; } elsif ($isindented) { $line =~ s/^\ (.*)/<li class="nobullet">$1<\/li>/; } elsif ($isasterisk) { $line =~ s/^\* (.*)/<li>$1<\/li>/; substr $line, 0, 0, "<ul>\n" if $isfirst; } } # END # Write new line back substr $$text, $pos1, $len, $line; # Calculate diff $lendif = (length $line) - ((length $_) - ($lflen)); # Adjust our and Perl's (!) position counter $pos2 += $lendif; # That's our counter seek $fh, $lendif, 1; # That's from Perl / SEEK_CUR } }

In reply to Re^2: Where to put self-made loop logic (separate module)? by basic6
in thread Where to put self-made loop logic (separate module)? by basic6

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
  • 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 about the Monastery: (11)
    As of 2015-07-31 11:27 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (276 votes), past polls