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wp-content/plugins/jetpack-boost/compatibility/woocommerce.php

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+<?php
+/**
+ * Compatibility functions for WooCommerce
+ *
+ * @package automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Compatibility\Woocommerce;
+
+/**
+ * Exclude special Woocommerce pages from standard "single page" Critical CSS.
+ *
+ * @param object $args the query args.
+ */
+function exclude_woocommerce_pages_from_query( $args ) {
+
+	// Only do this for page post type.
+	if ( 'page' !== $args['post_type'] ) {
+		return $args;
+	}
+
+	$woocommerce_pages = get_woocommerce_page_ids();
+	if ( empty( $woocommerce_pages ) ) {
+		return $args;
+	}
+
+	if ( ! isset( $args['post__not_in'] ) ) {
+		$args['post__not_in'] = array();
+	}
+
+	$args['post__not_in'] = array_merge( $woocommerce_pages, $args['post__not_in'] );
+
+	return $args;
+}
+
+/**
+ * Get those ol' WooCommerce page IDs
+ */
+function get_woocommerce_page_ids() {
+	if ( ! function_exists( 'wc_get_page_id' ) ) {
+		return array();
+	}
+	$page_slugs = array( 'myaccount', 'shop', 'cart', 'checkout', 'view_order', 'terms' );
+	$ids        = array_map( 'wc_get_page_id', $page_slugs );
+	$ids        = array_filter(
+		$ids,
+		function ( $value ) {
+			return $value > 0;
+		}
+	);
+
+	return $ids;
+}
+
+add_filter( 'jetpack_boost_critical_css_post_type_query', __NAMESPACE__ . '\exclude_woocommerce_pages_from_query' );