protected function positionOfToc() {

		$search = array_keys( $this->manifest );

		if ( false === $this->frontMatterLastPos ) {

			$array_pos = array_search( 'copyright', $search, true );
			if ( false === $array_pos ) {
				$array_pos = -1;
			}
		} else {

			$array_pos = -1;
			$preg = '/^front-matter-' . sprintf( '%03s', $this->frontMatterLastPos ) . '$/';
			foreach ( $search as $key => $val ) {
				if ( preg_match( $preg, $val ) ) {
					$array_pos = $key;
					break;
				}
			}
		}

		return $array_pos;
	}