silverstripe / silverstripe-fulltextsearch

        foreach ($searchQuery->require as $field => $values) {

            $requireq = array();

            foreach ($values as $value) {

                if ($value === SearchQuery::$missing) {

                    $requireq[] = "(*:* -{$field}:[* TO *])";

                } elseif ($value === SearchQuery::$present) {

                    $requireq[] = "{$field}:[* TO *]";

                } elseif ($value instanceof SearchQuery_Range) {

                    $start = $value->start;

                    if ($start === null) {

                        $start = '*';

                    }

                    $end = $value->end;

                    if ($end === null) {

                        $end = '*';

                    }

                    $requireq[] = "$field:[$start TO $end]";

                } else {

                    $requireq[] = $field.':"'.$value.'"';

                }

            }

            $fq[] = '+('.implode(' ', $requireq).')';

        }

            $excludeq = [];

            $missing = false;

            foreach ($values as $value) {

                if ($value === SearchQuery::$missing) {

                    $missing = true;

                } elseif ($value === SearchQuery::$present) {

                    $excludeq[] = "{$field}:[* TO *]";

                } elseif ($value instanceof SearchQuery_Range) {

                    $start = $value->start;

                    if ($start === null) {

                        $start = '*';

                    }

                    $end = $value->end;

                    if ($end === null) {

                        $end = '*';

                    }

                    $excludeq[] = "$field:[$start TO $end]";

                } else {

                    $excludeq[] = $field.':"'.$value.'"';

                }

            }

            $fq[] = ($missing ? "+{$field}:[* TO *] " : '') . '-('.implode(' ', $excludeq).')';

        }