<?php

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declare( strict_types = 1 );

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namespace Automattic\WooCommerce\Internal\Utilities;

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/**

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* Helper functions for working with blocks.

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*/

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class BlocksUtil {

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/**

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* Return blocks with their inner blocks flattened.

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*

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* @param array $blocks Array of blocks as returned by parse_blocks().

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* @return array All blocks.

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*/

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public static function flatten_blocks( $blocks ) {

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return array_reduce(

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$blocks,

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function ( $carry, $block ) {

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array_push( $carry, array_diff_key( $block, array_flip( array( 'innerBlocks' ) ) ) );

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if ( isset( $block['innerBlocks'] ) ) {

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$inner_blocks = self::flatten_blocks( $block['innerBlocks'] );

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return array_merge( $carry, $inner_blocks );

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}

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return $carry;

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},

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array()

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);

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}

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/**

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* Get all instances of the specified block from the widget area.

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*

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* @param array $block_name The name (id) of a block, e.g. `woocommerce/mini-cart`.

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* @return array Array of blocks as returned by parse_blocks().

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*/

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public static function get_blocks_from_widget_area( $block_name ) {

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$blocks = get_option( 'widget_block' );

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if ( ! is_array( $blocks ) || empty( $blocks ) ) {

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return array();

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}

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return array_reduce(

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$blocks,

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function ( $acc, $block ) use ( $block_name ) {

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$parsed_blocks = ! empty( $block['content'] ) ? parse_blocks( $block['content'] ) : array();

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if ( ! empty( $parsed_blocks ) && $block_name === $parsed_blocks[0]['blockName'] ) {

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array_push( $acc, $parsed_blocks[0] );

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}

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return $acc;

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},

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array()

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);

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}

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/**

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* Get all instances of the specified block on a specific template part.

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*

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* @param string $block_name The name (id) of a block, e.g. `woocommerce/mini-cart`.

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* @param string $template_part_slug The woo page to search, e.g. `header`.

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* @return array Array of blocks as returned by parse_blocks().

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*/

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public static function get_block_from_template_part( $block_name, $template_part_slug ) {

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$template = get_block_template( get_stylesheet() . '//' . $template_part_slug, 'wp_template_part' );

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$blocks = parse_blocks( $template->content );

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$flatten_blocks = self::flatten_blocks( $blocks );

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return array_values(

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array_filter(

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$flatten_blocks,

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function ( $block ) use ( $block_name ) {

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return ( $block_name === $block['blockName'] );

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}

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)

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);

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}

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}

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