I've flagged this as a performance issue because the current re-parsing of Comcode within search results is a performance hit.

Here's a messy diff to implement this, made on a v9 site and using https://markjs.io/...

diff --git a/site/pages/modules/search.php b/site/pages/modules/search.php
index 45bf567..7272be5 100644
--- a/site/pages/modules/search.php
+++ b/site/pages/modules/search.php
@@ -558,7 +558,40 @@ class Module_search
}
}

- return do_template('SEARCH_FORM_SCREEN',array('_GUID'=>'8bb208185740183323a6fe6e89d55de5','SEARCH_TERM'=>is_null($content)?'':$content,'HAS_TEMPLATE_SEARCH'=>$has_template_search,'NUM_RESULTS'=>integer_format($num_results),'CAN_ORDER_BY_RATING'=>$can_order_by_rating,'EXTRA_SORT_FIELDS'=>$extra_sort_fields,'USER_LABEL'=>$user_label,'DAYS_LABEL'=>$days_label,'BOOLEAN_SEARCH'=>$this->_is_boolean_search(),'AND'=>$boolean_operator=='AND','ONLY_TITLES'=>$only_titles,'DAYS'=>strval($days),'SORT'=>$sort,'DIRECTION'=>$direction,'CONTENT'=>$content,'RESULTS'=>$out,'PAGINATION'=>$pagination,'OLD_MYSQL'=>$old_mysql,'TITLE'=>$title,'AUTHOR'=>$author,'SPECIALISATION'=>$specialisation,'URL'=>$url));
+ if (get_value('js_highlight')==='1') {
+ require_javascript('javascript_mark');
+
+ global $SEARCH__CONTENT_BITS;
+ $search_keywords = $SEARCH__CONTENT_BITS;
+ } else {
+ $search_keywords = null;
+ }
+
+ return do_template('SEARCH_FORM_SCREEN',array(
+ '_GUID'=>'8bb208185740183323a6fe6e89d55de5',
+ 'SEARCH_TERM'=>is_null($content)?'':$content,
+ 'HAS_TEMPLATE_SEARCH'=>$has_template_search,
+ 'NUM_RESULTS'=>integer_format($num_results),
+ 'CAN_ORDER_BY_RATING'=>$can_order_by_rating,
+ 'EXTRA_SORT_FIELDS'=>$extra_sort_fields,
+ 'USER_LABEL'=>$user_label,
+ 'DAYS_LABEL'=>$days_label,
+ 'BOOLEAN_SEARCH'=>$this->_is_boolean_search(),
+ 'AND'=>$boolean_operator=='AND',
+ 'ONLY_TITLES'=>$only_titles,
+ 'DAYS'=>strval($days),
+ 'SORT'=>$sort,
+ 'DIRECTION'=>$direction,
+ 'CONTENT'=>$content,
+ 'RESULTS'=>$out,
+ 'PAGINATION'=>$pagination,
+ 'OLD_MYSQL'=>$old_mysql,
+ 'TITLE'=>$title,
+ 'AUTHOR'=>$author,
+ 'SPECIALISATION'=>$specialisation,
+ 'URL'=>$url,
+ 'SEARCH_KEYWORDS'=>$search_keywords,
+ ));
}

/**
@@ -612,7 +645,7 @@ class Module_search
$_content_bits=explode(' ',str_replace('"','',preg_replace('#(^|\s)\+#','',preg_replace('#(^|\s)\-#','',$content))));
$SEARCH__CONTENT_BITS=array();
require_code('textfiles');
- $too_common_words=explode(chr(10),read_text_file('too_common_words','',true));
+ $too_common_words=(get_value('js_highlight')==='1')?array():explode(chr(10),read_text_file('too_common_words','',true));
foreach ($_content_bits as $content_bit)
{
$content_bit=trim($content_bit);
diff --git a/sources/lang.php b/sources/lang.php
index 1b77963..3568198 100644
--- a/sources/lang.php
+++ b/sources/lang.php
@@ -1164,7 +1164,7 @@ function get_translated_tempcode($table,$row,$field_name,$connection=NULL,$lang=
}

global $SEARCH__CONTENT_BITS;
- if ($SEARCH__CONTENT_BITS!==NULL) // Doing a search so we need to reparse, with highlighting on
+ if (($SEARCH__CONTENT_BITS!==NULL) && (get_value('js_highlight')!=='1')) // Doing a search so we need to reparse, with highlighting on
{
$_result=$connection->query_select('translate',array('text_original','source_user'),array('id'=>$entry,'language'=>$lang),'',1);
if (array_key_exists(0,$_result))
@@ -1198,7 +1198,7 @@ function get_translated_tempcode($table,$row,$field_name,$connection=NULL,$lang=
} else
{
global $SEARCH__CONTENT_BITS;
- if ($SEARCH__CONTENT_BITS!==NULL) // Doing a search so we need to reparse, with highlighting on
+ if (($SEARCH__CONTENT_BITS!==NULL) && (get_value('js_highlight')!=='1')) // Doing a search so we need to reparse, with highlighting on
{
global $LAX_COMCODE;
$temp=$LAX_COMCODE;
diff --git a/sources/tempcode_compiler.php b/sources/tempcode_compiler.php
index e887e53..d5860b2 100644
--- a/sources/tempcode_compiler.php
+++ b/sources/tempcode_compiler.php
@@ -601,7 +601,7 @@ function _do_template($theme,$path,$codename,$_codename,$lang,$suffix,$theme_ori
$_path=$base_dir.filter_naughty($theme.$path.$codename).$suffix;
$tmp=fopen($_path,'rb');
flock($tmp,LOCK_SH);
- $html=unixify_line_format(file_get_contents($_path));
+ $html=unixify_line_format(file_get_contents($_path),($codename=='JAVASCRIPT_MARK')?'utf-8':null);
flock($tmp,LOCK_UN);
fclose($tmp);
}
diff --git a/themes/VWGolf-2015/templates_custom/SEARCH_FORM_SCREEN.tpl b/themes/VWGolf-2015/templates_custom/SEARCH_FORM_SCREEN.tpl
index 7962755..ada1fda 100644
--- a/themes/VWGolf-2015/templates_custom/SEARCH_FORM_SCREEN.tpl
+++ b/themes/VWGolf-2015/templates_custom/SEARCH_FORM_SCREEN.tpl
@@ -172,4 +172,23 @@
</div>
</div></div>
</form>
-{+END}
\ No newline at end of file
+{+END}
+
+{+START,IF_PASSED,SEARCH_KEYWORDS}
+ <script>
+ // https://markjs.io/
+
+ var element = document.querySelectorAll('.search_result');
+ var instance = new Mark(element);
+ instance.mark(
+ [
+ {+START,LOOP,SEARCH_KEYWORDS}
+ '{_loop_var;}',
+ {+END}
+ ],
+ {
+ 'className': 'comcode_highlight',
+ }
+ );
+ </script>
+{+END}
diff --git a/themes/default/templates/JAVASCRIPT_NEED.tpl b/themes/default/templates/JAVASCRIPT_NEED.tpl
index acc50f1..c133a0e 100644
--- a/themes/default/templates/JAVASCRIPT_NEED.tpl
+++ b/themes/default/templates/JAVASCRIPT_NEED.tpl
@@ -1 +1 @@
-<script type="text/javascript" src="{$CUSTOM_BASE_URL*}/themes/{$THEME*}/templates_cached/{$LANG*}/{CODE*}.js{+START,IF_PASSED,SUP}?{SUP*}{+END}"></script>
+<script{+START,IF,{$EQ,{CODE},javascript_mark}} charset="utf-8"{+END} type="text/javascript" src="{$CUSTOM_BASE_URL*}/themes/{$THEME*}/templates_cached/{$LANG*}/{CODE*}.js{+START,IF_PASSED,SUP}?{SUP*}{+END}"></script>


I'm not putting into v11 just because it requires JS code to be done neatly to the new framework, and we have a bottleneck in that area at the moment.


When done, the mark.js dependency will need tracking properly.