<?php

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/**

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* Server-side rendering of the `core/file` block.

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*

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* @package WordPress

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*/

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/**

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* When the `core/file` block is rendering, check if we need to enqueue the `wp-block-file-view` script.

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*

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* @since 5.8.0

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*

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* @param array $attributes The block attributes.

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* @param string $content The block content.

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*

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* @return string Returns the block content.

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*/

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function render_block_core_file( $attributes, $content ) {

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if ( empty( $attributes['displayPreview'] ) ) {

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return $content;

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}

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// If it's interactive, enqueue the script module and add the directives.

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wp_enqueue_script_module( '@wordpress/block-library/file/view' );

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$processor = new WP_HTML_Tag_Processor( $content );

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if ( $processor->next_tag() ) {

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$processor->set_attribute( 'data-wp-interactive', 'core/file' );

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}

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// If there are no OBJECT elements, something might have already modified the block.

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if ( ! $processor->next_tag( 'OBJECT' ) ) {

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return $content;

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}

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$processor->set_attribute( 'data-wp-bind--hidden', '!state.hasPdfPreview' );

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$processor->set_attribute( 'hidden', true );

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$filename = $processor->get_attribute( 'aria-label' );

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$has_filename = is_string( $filename ) && ! empty( $filename ) && 'PDF embed' !== $filename;

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$label = $has_filename ? sprintf(

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/* translators: %s: filename. */

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__( 'Embed of %s.' ),

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$filename

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) : __( 'PDF embed' );

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// Update object's aria-label attribute if present in block HTML.

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// Match an aria-label attribute from an object tag.

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$processor->set_attribute( 'aria-label', $label );

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return $processor->get_updated_html();

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}

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/**

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

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*

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* @since 5.8.0

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*/

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function register_block_core_file() {

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register_block_type_from_metadata(

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__DIR__ . '/file',

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array(

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'render_callback' => 'render_block_core_file',

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)

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);

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}

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add_action( 'init', 'register_block_core_file' );

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