function search_simplify_excerpt_match

Find words in the original text that matched via search_simplify().

This is called in search_excerpt() if an exact match is not found in the text, so that we can find the derived form that matches.

Parameters

$key: The keyword to find.

$text: The text to search for the keyword.

$offset: Offset position in $text to start searching at.

$boundary: Text to include in a regular expression that will match a word boundary.

Return value

FALSE if no match is found. If a match is found, return an associative array with element 'where' giving the position of the match, and element 'keyword' giving the actual word found in the text at that position.

File

modules/search/search.module, line 1291

Code

function search_simplify_excerpt_match($key, $text, $offset, $boundary) {
    $pos = NULL;
    $simplified_key = search_simplify($key);
    $simplified_text = search_simplify($text);
    // Return immediately if simplified key or text are empty.
    if (!$simplified_key || !$simplified_text) {
        return FALSE;
    }
    // Check if we have a match after simplification in the text.
    if (!preg_match('/' . $boundary . $simplified_key . $boundary . '/iu', $simplified_text, $match, PREG_OFFSET_CAPTURE, $offset)) {
        return FALSE;
    }
    // If we get here, we have a match. Now find the exact location of the match
    // and the original text that matched. Start by splitting up the text by all
    // potential starting points of the matching text and iterating through them.
    $split = array_filter(preg_split('/' . $boundary . '/iu', $text, -1, PREG_SPLIT_OFFSET_CAPTURE), '_search_excerpt_match_filter');
    foreach ($split as $value) {
        // Skip starting points before the offset.
        if ($value[1] < $offset) {
            continue;
        }
        // Check a window of 80 characters after the starting point for a match,
        // based on the size of the excerpt window.
        $window = substr($text, $value[1], 80);
        $simplified_window = search_simplify($window);
        if (strpos($simplified_window, $simplified_key) === 0) {
            // We have a match in this window. Store the position of the match.
            $pos = $value[1];
            // Iterate through the text in the window until we find the full original
            // matching text.
            $length = strlen($window);
            for ($i = 1; $i <= $length; $i++) {
                $keyfound = substr($text, $value[1], $i);
                if ($simplified_key == search_simplify($keyfound)) {
                    break;
                }
            }
            break;
        }
    }
    return $pos ? array(
        'where' => $pos,
        'keyword' => $keyfound,
    ) : FALSE;
}