<?php

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namespace Yoast\WP\SEO\Helpers;

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use WP_Block_Parser_Block;

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/**

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* A helper object for blocks.

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*/

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class Blocks_Helper {

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/**

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* Holds the Post_Helper instance.

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*

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* @var Post_Helper

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*/

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private $post;

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/**

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* Constructs a Blocks_Helper instance.

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*

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* @codeCoverageIgnore It handles dependencies.

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*

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* @param Post_Helper $post The post helper.

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*/

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public function __construct( Post_Helper $post ) {

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$this->post = $post;

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}

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/**

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* Returns all blocks in a given post.

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*

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* @param int $post_id The post id.

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*

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* @return array The blocks in a block-type => WP_Block_Parser_Block[] format.

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*/

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public function get_all_blocks_from_post( $post_id ) {

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if ( ! $this->has_blocks_support() ) {

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return [];

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}

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$post = $this->post->get_post( $post_id );

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return $this->get_all_blocks_from_content( $post->post_content );

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}

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/**

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* Returns all blocks in a given content.

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*

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* @param string $content The content.

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*

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* @return array The blocks in a block-type => WP_Block_Parser_Block[] format.

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*/

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public function get_all_blocks_from_content( $content ) {

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if ( ! $this->has_blocks_support() ) {

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return [];

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}

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$collection = [];

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$blocks = \parse_blocks( $content );

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return $this->collect_blocks( $blocks, $collection );

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}

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/**

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* Checks if the installation has blocks support.

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*

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* @codeCoverageIgnore It only checks if a WordPress function exists.

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*

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* @return bool True when function parse_blocks exists.

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*/

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protected function has_blocks_support() {

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return \function_exists( 'parse_blocks' );

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}

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/**

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* Collects an array of blocks into an organised collection.

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*

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* @param WP_Block_Parser_Block[] $blocks The blocks.

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* @param array $collection The collection.

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*

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* @return array The blocks in a block-type => WP_Block_Parser_Block[] format.

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*/

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private function collect_blocks( $blocks, $collection ) {

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foreach ( $blocks as $block ) {

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if ( ! isset( $collection[ $block['blockName'] ] ) || ! \is_array( $collection[ $block['blockName'] ] ) ) {

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$collection[ $block['blockName'] ] = [];

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}

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$collection[ $block['blockName'] ][] = $block;

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

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$collection = $this->collect_blocks( $block['innerBlocks'], $collection );

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}

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}

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return $collection;

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}

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}

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