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# itex2MML
# version 2.0
# copyright 2003-2019, Jacques Distler
#
package MT::Plugin::itex2MML;
use MT;
use MathML::itex2MML qw( itex_html_filter );
use vars qw( $VERSION );
$VERSION = '2.0';
eval{ require MT::Plugin;};
unless ($@) {
my $plugin = {
name => "itex2MML",
version => $VERSION,
description => "A Text-Filter, translating embedded itex equations into MathML",
doc_link => 'http://golem.ph.utexas.edu/~distler/blog/itex2MML.html',
};
MT->add_plugin(new MT::Plugin($plugin));
}
MT->add_text_filter(itexToMML => {
label => 'itex to MathML',
on_format => sub { &itexToMML; },
});
MT->add_text_filter(itexToMMLpara => {
label => 'itex to MathML with parbreaks',
on_format => sub { &itexToMMLpara; },
});
my $itex2mml_number_equations = 1;
sub itexToMML {
$_=shift;
$ctx = shift;
$_=~ s/\r//g;
$_ = number_equations($_, $itex2mml_number_equations, $ctx);
my $text = itex_html_filter($_);
"<div><a href=\"http://golem.ph.utexas.edu/~distler/blog/mathml.html\" onclick=\"window.open\(this.href, \'MathML\', \'width=310,height=150,scrollbars=no,resizable=yes,status=no\'\); return false;\" onkeypress=\"if\(window.event.keyCode == 13\)\{window.open\(this.href, \'MathML\', \'width=310,height=150,scrollbars=no,resizable=yes,status=no\'\); return false;\}\"><img class=\"mathlogo\" src=\"https://golem.ph.utexas.edu/~distler/blog/images/MathML.png\" alt=\"MathML-enabled post \(click for more details\).\" title=\"MathML-enabled post \(click for details\).\" /></a></div>\n" . $text;
}
sub itexToMMLpara {
$_ = shift;
$ctx = shift;
$_=~ s/\r//g;
$_ = number_equations($_, $itex2mml_number_equations, $ctx);
$_ = splitparas($_);
my $text = itex_html_filter($_);
"<div><a href=\"http://golem.ph.utexas.edu/~distler/blog/mathml.html\" onclick=\"window.open\(this.href, \'MathML\', \'width=310,height=150,scrollbars=no,resizable=yes,status=no\'\); return false;\" onkeypress=\"if\(window.event.keyCode == 13\)\{window.open\(this.href, \'MathML\', \'width=310,height=150,scrollbars=no,resizable=yes,status=no\'\); return false;\}\"><img class=\"mathlogo\" src=\"https://golem.ph.utexas.edu/~distler/blog/images/MathML.png\" alt=\"MathML-enabled post \(click for more details\).\" title=\"MathML-enabled post \(click for details\).\" /></a></div>\n" . $text;
}
sub splitparas {
my $str = shift;
$str ||= '';
my @paras = split /\n{2,}/, $str;
for my $p (@paras) {
if ($p !~ m@^</?(?:h1|h2|h3|h4|h5|h6|table|ol|dl|ul|menu|dir|p|pre|center|form|fieldset|select|blockquote|address|div|hr)@) {
# if ($p !~ m@^\s*</?(?:h1|h2|h3|h4|h5|h6|table|ol|dl|ul|menu|dir|p|pre|center|form|fieldset|select|blockquote|address|div|hr)@) {
$p = "<p>$p</p>";
}
}
join "\n\n", @paras;
}
sub number_equations {
$_ = shift;
my $arg_value = shift;
my $ctx = shift;
if ($arg_value == 0) {return $_;}
my $prefix = "eq";
if ((defined $ctx) && (ref($ctx) eq 'MT::Template::Context')) {
if ($ctx->stash('comment') ) {
$prefix = "c" . $ctx->stash('comment')->id;
} elsif ($ctx->stash('entry') ) {
$prefix = "e" . $ctx->stash('entry')->id;
}
}
my $cls = "numberedEq";
my %eqnumber;
my $eqno=1;
# add equation numbers to \[...\]
# - introduce a wrapper-<div> and a <span> with the equation number
# while (s/(^\s*)?\\\[(.*?)\\\]/\n\n$1<div class=\"$cls\"><span>\($eqno\)<\/span>\$\$$2\$\$<\/div>\n\n/s) {
while (s/\\\[(.*?)\\\]/\n\n<div class=\"$cls\"><span>\($eqno\)<\/span>\$\$$1\$\$<\/div>\n\n/s) {
$eqno++;
}
# assemble equation labels into a hash
# - remove the \label{} command, collapse surrounding whitespace
# - add an ID to the wrapper-<div>. prefix it to give a fighting chance
# for the ID to be unique
# - hash key is the equation label, value is the equation number
while (s/<div class=\"$cls\"><span>\((\d+)\)<\/span>\$\$((?:[^\$]|\\\$)*)\s*\\label{(\w*)}\s*((?:[^\$]|\\\$)*)\$\$<\/div>/<div class=\"$cls\" id=\"$prefix:$3\"><span>\($1\)<\/span>\$\$$2$4\$\$<\/div>/s) {
$eqnumber{"$3"} = $1;
}
# add cross-references
# - they can be either (eq:foo) or \eqref{foo}
s/\(eq:(\w+)\)/\(<a href=\"#$prefix:$1\">$eqnumber{"$1"}<\/a>\)/g;
s/\\eqref\{(\w+)\}/\(<a href=\'#$prefix:$1\'>$eqnumber{"$1"}<\/a>\)/g;
return $_;
}
1;
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