path: root/IkiWiki/Plugin/smiley.pm

#!/usr/bin/perl
package IkiWiki::Plugin::smiley;

use warnings;
use strict;
use IkiWiki 2.00;

my %smileys;
my $smiley_regexp;

sub import { #{{{
    add_underlay("smiley");
    hook(type => "sanitize", id => "smiley", call => \&sanitize);
} # }}}

sub build_regexp () { #{{{
    my $list=readfile(srcfile("smileys.mdwn"));
    while ($list =~ m/^\s*\*\s+\\([^\s]+)\s+\[\[([^]]+)\]\]/mg) {
        my $smiley=$1;
        my $file=$2;

        $smileys{$smiley}=$file;

        # Add a version with < and > escaped, since they probably
        # will be (by markdown) by the time the sanitize hook runs.
        $smiley=~s/</&lt;/g;
        $smiley=~s/>/&gt;/g;
        $smileys{$smiley}=$file;
    }
    
    if (! %smileys) {
        debug(gettext("failed to parse any smileys"));
        $smiley_regexp='';
        return;
    }
    
    # sort and reverse so that substrings come after longer strings
    # that contain them, in most cases.
    $smiley_regexp='('.join('|', map { quotemeta }
        reverse sort keys %smileys).')';
    #debug($smiley_regexp);
} #}}}

sub sanitize (@) { #{{{
    my %params=@_;

    build_regexp() unless defined $smiley_regexp;
    
    $_=$params{content};
    return $_ unless length $smiley_regexp;
    
MATCH:  while (m{(?:^|(?<=\s|>))(\\?)$smiley_regexp(?:(?=\s|<)|$)}g) {
        my $escape=$1;
        my $smiley=$2;
        my $epos=$-[1];
        my $spos=$-[2];
        
        # Smilies are not allowed inside <pre> or <code>.
        # For each tag in turn, match forward to find the next <tag>
        # or </tag> after the smiley.
        my $pos=pos;
        foreach my $tag ("pre", "code") {
            if (m/<(\/)?\s*$tag\s*>/isg && defined $1) {
                # </tag> found first, so the smiley is
                # inside the tag, so do not expand it.
                next MATCH;
            }
            # Reset pos back to where it was before this test.
            pos=$pos;
        }

        if ($escape) {
            # Remove escape.
            substr($_, $epos, 1)="";
        }
        else {
            # Replace the smiley with its expanded value.
            substr($_, $spos, length($smiley))=
                htmllink($params{page}, $params{page},
                         $smileys{$smiley}, linktext => $smiley);
        }
    }

    return $_;
} # }}}

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