/**
* Return a string with highlighted matched queries and relevant context
* Determins context based upon occurance and distance of words with each other.
*
* @param string $haystack
* @param string $query
* @param int $min_match_context = 30
* @param int $max_length = 300
* @return string
*/
function search_get_highlighted_relevant_substrings($haystack, $query, $min_match_context = 30, $max_length = 300)
{
global $CONFIG;
$haystack = strip_tags($haystack);
$haystack_length = elgg_strlen($haystack);
$haystack_lc = elgg_strtolower($haystack);
$words = search_remove_ignored_words($query, 'array');
// if haystack < $max_length return the entire haystack w/formatting immediately
if ($haystack_length <= $max_length) {
$return = search_highlight_words($words, $haystack);
return $return;
}
// get the starting positions and lengths for all matching words
$starts = array();
$lengths = array();
foreach ($words as $word) {
$word = elgg_strtolower($word);
$count = elgg_substr_count($haystack_lc, $word);
$word_len = elgg_strlen($word);
// find the start positions for the words
if ($count > 1) {
$offset = 0;
while (FALSE !== ($pos = elgg_strpos($haystack_lc, $word, $offset))) {
$start = $pos - $min_match_context > 0 ? $pos - $min_match_context : 0;
$starts[] = $start;
$stop = $pos + $word_len + $min_match_context;
$lengths[] = $stop - $start;
$offset += $pos + $word_len;
}
} else {
$pos = elgg_strpos($haystack_lc, $word);
$start = $pos - $min_match_context > 0 ? $pos - $min_match_context : 0;
$starts[] = $start;
$stop = $pos + $word_len + $min_match_context;
$lengths[] = $stop - $start;
}
}
$offsets = search_consolidate_substrings($starts, $lengths);
// figure out if we can adjust the offsets and lengths
// in order to return more context
$total_length = array_sum($offsets);
$add_length = 0;
if ($total_length < $max_length) {
$add_length = floor(($max_length - $total_length) / count($offsets) / 2);
$starts = array();
$lengths = array();
foreach ($offsets as $offset => $length) {
$start = $offset - $add_length > 0 ? $offset - $add_length : 0;
$length = $length + $add_length;
$starts[] = $start;
$lengths[] = $length;
}
$offsets = search_consolidate_substrings($starts, $lengths);
}
// sort by order of string size descending (which is roughly
// the proximity of matched terms) so we can keep the
// substrings with terms closest together and discard
// the others as needed to fit within $max_length.
arsort($offsets);
$return_strs = array();
$total_length = 0;
foreach ($offsets as $start => $length) {
$string = trim(elgg_substr($haystack, $start, $length));
// continue past if adding this substring exceeds max length
if ($total_length + $length > $max_length) {
continue;
}
$total_length += $length;
$return_strs[$start] = $string;
}
// put the strings in order of occurence
ksort($return_strs);
// add ...s where needed
$return = implode('...', $return_strs);
if (!array_key_exists(0, $return_strs)) {
$return = "...{$return}";
}
// add to end of string if last substring doesn't hit the end.
$starts = array_keys($return_strs);
$last_pos = $starts[count($starts) - 1];
if ($last_pos + elgg_strlen($return_strs[$last_pos]) < $haystack_length) {
$return .= '...';
}
$return = search_highlight_words($words, $return);
return $return;
}
$(function () {
// initialise picker
$("div#friends-picker<?php
echo $friendspicker;
?>
").friendsPicker(<?php
echo $friendspicker;
?>
);
// manually add class to corresponding tab for panels that have content
<?php
if (sizeof($activeletters) > 0) {
$chararray .= "*";
foreach ($activeletters as $letter) {
$tab = elgg_strpos($chararray, $letter) + 1;
?>
$("div#friends-picker-navigation<?php
echo $friendspicker;
?>
li.tab<?php
echo $tab;
?>
a").addClass("tabHasContent");
<?php
}
}
?>
});
});
</script>