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package MojoMojo::Formatter::SyntaxHighlight;
use strict;
use warnings;
use parent qw/MojoMojo::Formatter/;
use HTML::Entities;
eval {require Syntax::Highlight::Engine::Kate};
my $kate_installed = !$@;
=head2 module_loaded
Return true if the module is loaded.
=cut
sub module_loaded { $kate_installed }
my $main_formatter;
eval { $main_formatter = MojoMojo->pref('main_formatter'); };
$main_formatter ||= 'MojoMojo::Formatter::Markdown';
=head1 NAME
MojoMojo::Formatter::SyntaxHighlight - syntax highlighting for code blocks
=head1 DESCRIPTION
This formatter performs syntax highlighting on code blocks.
=head1 METHODS
=head2 format_content_order
The syntax highlight formatter is based on C<< <pre> >> tags entered by the
user, so it must run before other formatters that produce C<< <pre> >> tags.
The earliest such formatter is the main formatter.
=cut
sub format_content_order { 14 }
=head2 format_content
This formatter uses L<Syntax::Highlight::Engine::Kate> to syntax highlight code
inside of C<< <pre lang="language"> ... </pre> >> tags:
<pre lang="Perl">
say "Hello world!";
</pre>
See L<Syntax::Highlight::Engine::Kate/PLUGINS> for a list of supported
languages.
=cut
# The $kate formatter is scoped outside of format_content. Otherwise, memory
# leaks have occurred. This is also faster, as it avoids instantiation for every
# request.
my $kate;
sub format_content {
my ( $class, $content ) = @_;
return unless $class->module_loaded;
my @blocks = ();
my $ph = 0;
my $ph_base = __PACKAGE__ . '::PlaceHolder::';
# new school - consistent with other new syntax, but broke for me to the point of exhaustion
# $$content =~ s/\{\{\s*code\s+lang=""\s*\}\}/<pre>/g;
# while ( $$content =~ s/\{\{\s*code(?:\s+lang=['"]*(.*?)['"]*")?\s*\}\}(.*?)\{\{\s*end\s*\}\}/$ph_base$ph/si ) {
# drop all lang="" -- mateu
$$content =~ s/<\s*pre\s+lang=""\s*>/<pre>/g;
while ( $$content =~ s/<\s*pre(?:\s+lang=['"]*(.*?)['"]*")?\s*>(.*?)<\s*\/pre\s*>/$ph_base$ph/si ) {
my ( $language, $block ) = ( $1, $2 );
# Fix newline issue
$block =~ s/\r//g;
if ($language) {
eval {
$kate->language($language);
} and do {
$block = $kate->highlightText($block);
}
}
push @blocks, $block;
$ph++;
}
for ( my $i = 0 ; $i < $ph ; $i++ ) {
$$content =~ s/$ph_base$i/<pre>$blocks[$i]<\/pre>/;
}
return $content;
}
if (module_loaded) {
$kate = Syntax::Highlight::Engine::Kate->new(
language => 'Perl',
substitutions => {
"<" => "<",
">" => ">",
"&" => "&",
"^" => "ˆ",
" " => " ",
"\t" => " ",
"\n" => "\n",
},
format_table => {
Alert => [ q{<span class="kateAlert">}, "</span>" ],
BaseN => [ q{<span class="kateBaseN">}, "</span>" ],
BString => [ q{<span class="kateBString">}, "</span>" ],
Char => [ q{<span class="kateChar">}, "</span>" ],
Comment => [ q{<span class="kateComment"><i>}, "</i></span>" ],
DataType => [ q{<span class="kateDataType">}, "</span>" ],
DecVal => [ q{<span class="kateDecVal">}, "</span>" ],
Error => [ q{<span class="kateError"><b><i>}, "</i></b></span>" ],
Float => [ q{<span class="kateFloat">}, "</span>" ],
Function => [ q{<span class="kateFunction">}, "</span>" ],
IString => [ q{<span class="kateIString">}, "" ],
Keyword => [ q{<b>}, "</b>" ],
Normal => [ q{}, "" ],
Operator => [ q{<span class="kateOperator">}, "</span>" ],
Others => [ q{<span class="kateOthers">}, "</span>" ],
RegionMarker => [ q{<span class="kateRegionMarker"><i>}, "</i></span>" ],
Reserved => [ q{<span class="kateReserved"><b>}, "</b></span>" ],
String => [ q{<span class="kateString">}, "</span>" ],
Variable => [ q{<span class="kateVariable"><b>}, "</b></span>" ],
Warning => [ q{<span class="kateWarning"><b><i>}, "</b></i></span>" ],
},
);
}
=head1 SEE ALSO
L<MojoMojo>, L<Module::Pluggable::Ordered> and L<Syntax::Highlight::Engine::Kate>.
=head1 AUTHORS
Johannes Plunien E<lt>plu@cpan.orgE<gt>
=head1 LICENSE
This library is free software. You can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
1;
|
