tarantool-php / mapper

            $states = [];

            foreach ($timeaxis as $state) {

                foreach ($changeaxis as $changes) {

                    foreach ($changes as $change) {

                        if ($change->begin > $state->begin) {

                            // future override

                            continue;

                        }

                        if ($change->end && ($change->end < $state->end || !$state->end)) {

                            // complete override

                            continue;

                        }

                        $state->data[] = $change->data;

                    }

                }

                if (count($state->data)) {

                    $states[] = (object) array_merge(get_object_vars($state), $params);

                }

        // calculate states

        $states = [];

        foreach ($slices as $slice) {

            foreach ($changes as $change) {

                if ($change->begin > $slice->begin) {

                    // future change

                    continue;

                }

                if ($change->end && ($change->end < $slice->end || !$slice->end)) {

                    // complete change

                    continue;

                }

                $callback($slice, $change);

            }

            if (count((array) $slice->data)) {

                $states[] = $slice;

            }