<?php

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/**

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* Adds the wp-block-list class to the rendered list block.

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*

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* @package WordPress

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*/

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/**

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* Adds the wp-block-list class to the rendered list block.

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* Ensures that pre-existing list blocks use the class name on the front.

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* For example, <ol> is transformed to <ol class="wp-block-list">.

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*

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* @since 6.6.0

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*

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* @see https://github.com/WordPress/gutenberg/issues/12420

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*

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* @param array $attributes Attributes of the block being rendered.

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* @param string $content Content of the block being rendered.

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*

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* @return string The content of the block being rendered.

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*/

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function block_core_list_render( $attributes, $content ) {

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if ( ! $content ) {

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return $content;

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}

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$processor = new WP_HTML_Tag_Processor( $content );

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$list_tags = array( 'OL', 'UL' );

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while ( $processor->next_tag() ) {

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if ( in_array( $processor->get_tag(), $list_tags, true ) ) {

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$processor->add_class( 'wp-block-list' );

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break;

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}

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}

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return $processor->get_updated_html();

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}

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/**

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* Registers the `core/list` block on server.

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*

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* @since 6.6.0

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*/

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function register_block_core_list() {

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register_block_type_from_metadata(

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__DIR__ . '/list',

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array(

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'render_callback' => 'block_core_list_render',

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)

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);

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}

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add_action( 'init', 'register_block_core_list' );

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