cache highlighters to optimise

Setting up a new highlighter object is slightly expensive since it
reads and parses the langfile each time. So cache them.

This also speeds up ext2langfile by avoiding it needing to check for the
existence of a language file in some cases.

diff --git a/IkiWiki/Plugin/highlight.pm b/IkiWiki/Plugin/highlight.pm
index 90e7053d92d42d4b3f4e760c23aa537471e72e44..4c02f6c236e4feca4f6113e73f793bee683fef2c 100644 (file)
--- a/IkiWiki/Plugin/highlight.pm
+++ b/IkiWiki/Plugin/highlight.pm
@@ -74,6 +74,7 @@ sub htmlizefallback {
 
 my %ext2lang;
 my $filetypes_read=0;
+my %highlighters;
 
 # Parse highlight's config file to get extension => language mappings.
 sub read_filetypes () {
@@ -88,23 +89,23 @@ sub read_filetypes () {
        $filetypes_read=1;
 }
 
-sub langfile ($) {
-       return "$langdefdir/$_[0].lang";
-}
 
 # Given a filename extension, determines the language definition to
 # use to highlight it.
 sub ext2langfile ($) {
        my $ext=shift;
 
+       my $langfile="$langdefdir/$ext.lang";
+       return $langfile if exists $highlighters{$langfile};
+
        read_filetypes() unless $filetypes_read;
        if (exists $ext2lang{$ext}) {
-               return langfile($ext2lang{$ext});
+               return "$langdefdir/$ext2lang{$ext}.lang";
        }
        # If a language only has one common extension, it will not
        # be listed in filetypes, so check the langfile.
-       elsif (-e langfile($ext)) {
-               return langfile($ext);
+       elsif (-e $langfile) {
+               return $langfile;
        }
        else {
                return undef;
@@ -122,16 +123,21 @@ sub highlight ($$) {
                return $input;
        }
 
-       my $gen = highlightc::CodeGenerator_getInstance($highlightc::XHTML);
-       $gen->setFragmentCode(1); # generate html fragment
-       $gen->setHTMLEnclosePreTag(1); # include stylish <pre>
-       $gen->initLanguage($langfile);
-       $gen->initTheme("/dev/null"); # theme is not needed because CSS is not emitted
-       $gen->setEncoding("utf-8");
+       my $gen;
+       if (! exists $highlighters{$langfile}) {
+               $gen = highlightc::CodeGenerator_getInstance($highlightc::XHTML);
+               $gen->setFragmentCode(1); # generate html fragment
+               $gen->setHTMLEnclosePreTag(1); # include stylish <pre>
+               $gen->initLanguage($langfile);
+               $gen->initTheme("/dev/null"); # theme is not needed because CSS is not emitted
+               $gen->setEncoding("utf-8");
+               $highlighters{$langfile}=$gen;
+       }
+       else {          
+               $gen=$highlighters{$langfile};
+       }
 
-       my $output=$gen->generateString($input);
-       highlightc::CodeGenerator_deleteInstance($gen);
-       return $output;
+       return $gen->generateString($input);
 }
 
 1