IkiWiki/Plugin/smiley.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::smiley;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 3.00;
   7
   8 my %smileys;
   9 my $smiley_regexp;
  10
  11 sub import {
  12         add_underlay("smiley");
  13         hook(type => "getsetup", id => "smiley", call => \&getsetup);
  14         hook(type => "sanitize", id => "smiley", call => \&sanitize);
  15 }
  16
  17 sub getsetup () {
  18         return
  19                 plugin => {
  20                         safe => 1,
  21                         # force a rebuild because turning it off
  22                         # removes the smileys, which would break links
  23                         rebuild => 1,
  24                 },
  25 }
  26
  27 sub build_regexp () {
  28         my $list=readfile(srcfile("smileys.mdwn"));
  29         while ($list =~ m/^\s*\*\s+\\\\([^\s]+)\s+\[\[([^]]+)\]\]/mg) {
  30                 my $smiley=$1;
  31                 my $file=$2;
  32
  33                 $smileys{$smiley}=$file;
  34
  35                 # Add a version with < and > escaped, since they probably
  36                 # will be (by markdown) by the time the sanitize hook runs.
  37                 $smiley=~s/</&lt;/g;
  38                 $smiley=~s/>/&gt;/g;
  39                 $smileys{$smiley}=$file;
  40         }
  41
  42         if (! %smileys) {
  43                 debug(gettext("failed to parse any smileys"));
  44                 $smiley_regexp='';
  45                 return;
  46         }
  47
  48         # sort and reverse so that substrings come after longer strings
  49         # that contain them, in most cases.
  50         $smiley_regexp='('.join('|', map { quotemeta }
  51                 reverse sort keys %smileys).')';
  52         #debug($smiley_regexp);
  53 }
  54
  55 sub sanitize (@) {
  56         my %params=@_;
  57
  58         build_regexp() unless defined $smiley_regexp;
  59
  60         $_=$params{content};
  61         return $_ unless length $smiley_regexp;
  62
  63 MATCH:  while (m{(?:^|(?<=\s|>))(\\?)$smiley_regexp(?:(?=\s|<)|$)}g) {
  64                 my $escape=$1;
  65                 my $smiley=$2;
  66                 my $epos=$-[1];
  67                 my $spos=$-[2];
  68
  69                 # Smilies are not allowed inside <pre> or <code>.
  70                 # For each tag in turn, match forward to find the next <tag>
  71                 # or </tag> after the smiley.
  72                 my $pos=pos;
  73                 foreach my $tag ("pre", "code") {
  74                         if (m/<(\/)?\s*$tag\s*>/isg && defined $1) {
  75                                 # </tag> found first, so the smiley is
  76                                 # inside the tag, so do not expand it.
  77                                 next MATCH;
  78                         }
  79                         # Reset pos back to where it was before this test.
  80                         pos=$pos;
  81                 }
  82
  83                 if ($escape) {
  84                         # Remove escape.
  85                         substr($_, $epos, 1)="";
  86                         pos=$epos+1;
  87                 }
  88                 else {
  89                         # Replace the smiley with its expanded value.
  90                         substr($_, $spos, length($smiley))=
  91                                 htmllink($params{page}, $params{destpage},
  92                                          $smileys{$smiley}, linktext => $smiley);
  93                         pos=$epos+1;
  94                 }
  95         }
  96
  97         return $_;
  98 }
  99
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