Automattic / jetpack

		return $tag;

	}

	private function should_concat_script( $script ) {

		// only concat local scripts

		$is_local       = $this->is_local_url( $script->src );

		// don't concat conditional scripts

		$is_conditional = isset( $script->extra['conditional'] );

		return apply_filters( 'jetpack_perf_concat_script', $is_local && ! $is_conditional, $script->handle, $script->src );

	}

	private function buffer_script( $script ) {

		$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0;

		$this->concat_style_groups[$group][$media][] = $style;

	}

	private function should_concat_style( $style ) {

		// only concat local styles

		$is_local       = $this->is_local_url( $style->src );

		// don't concat conditional styles

		$is_conditional = isset( $style->extra['conditional'] );

		return apply_filters( 'jetpack_perf_concat_style', $is_local && ! $is_conditional, $style->handle, $style->src );

	}

	private function is_local_url( $url ) {

		$site_url = site_url();