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package IkiWiki::Plugin::mathjax;
use warnings;
use strict;
use IkiWiki 3.00;
use MIME::Base64;
# Strategy:
## - filter replaces normal TeX delimiters with imath and dmath directives
## (perhaps while considering a mathconf directive); also, it adds a script
## block if there is any math on the page relevant.
## - preprocess handles the directives themselves.
##
## Later: config hooks for mathjax script tag and mathjax config block
##
sub import {
hook(type => "filter", id => "mathjax", call => \&filter);
hook(type => "format", id=>"mathjax", call=> \&format);
}
sub format {
my %params = @_;
my $content = $params{content};
return $content unless $content =~ /\!\!mathjaxbegin/; #]/{{
$content =~ s{\!\!mathjaxbegin-i!! (.*?)\s\!\!mathjaxend-i\!\!}{'\('.decode_base64($1).'\)'}ges; #{
$content =~ s{\!\!mathjaxbegin-d!! (.*?)\s\!\!mathjaxend-d\!\!}{'\['.decode_base64($1).'\]'}ges; #{
my $scripttag = _scripttag();
$content =~ s{(</body>)}{$scripttag\n$1}i; #}{
return $content;
}
sub filter (@) {
my %params=@_;
my $content = $params{content};
return $content unless $content =~ /\$[^\$]+\$|\\[\(\[][\s\S]+\\[\)\]]/;
# first, handle display math...
$content =~ s{(?<!\\)\\\[(.+?)(?<!\\)\\\]}{_escape_mathjax('d', $1)}ges; #};[}
$content =~ s{(?<!\\)\$\$(.+?)(?<!\\)\$\$}{_escape_mathjax('d', $1)}ges; #};[}
# then, the inline math -- note that it must stay on one line
$content =~ s{(?<!\\)\\\((.+?)(?<!\\)\\\)}{_escape_mathjax('i', $1)}ge; #};[}
# note that the 'parsing' of $..$ is extremely fragile
$content =~ s{(?<!\\)\$(.+?)(?<!\\)\$}{_escape_mathjax('i', $1)}ge; #};[}
return $content;
}
sub _escape_mathjax {
my ($mode, $formula) = @_;
my %modes = qw/i inline d display/;
my $directive = "!!mathjaxbegin-$mode!! ";
$formula =~ s/"/"/g;
$formula =~ s/&/&/g; #"/}[{
$formula =~ s/</</g;
$formula =~ s/>/>/g; #{"
$directive .= encode_base64($formula, " ");
$directive .= "!!mathjaxend-$mode!!";
return $directive;
}
sub _scripttag {
my $config = 'TeX-AMS_HTML'; # another possibility: TeX-AMS-MML_HTMLorMML
return '<script type="text/x-mathjax-config">'
. 'MathJax.Hub.Config({ TeX: { equationNumbers: {autoNumber: "AMS"} } });'
. '</script>'
. '<script async="async" type="text/javascript" '
# Serving MathJax script locally
#. 'src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.9/MathJax.js?config='
#. 'src="/js/MathJax.js?config='
. 'src="/vendor/MathJax/es5/tex-chtml.js?config='
. $config
. '"></script>';
}
1;
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