<?php

/**

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

 *

 * @package WordPress

 */

/**

 * Renders the `core/post-excerpt` block on the server.

 *

 * @param array    $attributes Block attributes.

 * @param string   $content    Block default content.

 * @param WP_Block $block      Block instance.

 * @return string Returns the filtered post excerpt for the current post wrapped inside "p" tags.

 */

function render_block_core_post_excerpt( $attributes, $content, $block ) {

	if ( ! isset( $block->context['postId'] ) ) {

		return '';

	}

	$filter_excerpt_more = function( $more ) use ( $more_text ) {

		return empty( $more_text ) ? $more : '';

	};

	/**

	 * Some themes might use `excerpt_more` filter to handle the

	 * `more` link displayed after a trimmed excerpt. Since the

	 * block has a `more text` attribute we have to check and

	 * override if needed the return value from this filter.

	 * So if the block's attribute is not empty override the

	 * `excerpt_more` filter and return nothing. This will

	 * result in showing only one `read more` link at a time.

	 */

	add_filter( 'excerpt_more', $filter_excerpt_more );

	$classes = '';

	if ( isset( $attributes['textAlign'] ) ) {

		$classes .= "has-text-align-{$attributes['textAlign']}";

	}

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );

	$show_more_on_new_line = ! isset( $attributes['showMoreOnNewLine'] ) || $attributes['showMoreOnNewLine'];

	if ( $show_more_on_new_line && ! empty( $more_text ) ) {

		$content .= '</p><p class="wp-block-post-excerpt__more-text">' . $more_text . '</p>';

	} else {

		$content .= " $more_text</p>";

	}

	remove_filter( 'excerpt_more', $filter_excerpt_more );

	return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $content );

}

/**

 * Registers the `core/post-excerpt` block on the server.

 */

function register_block_core_post_excerpt() {

	register_block_type_from_metadata(

		__DIR__ . '/post-excerpt',

		array(

			'render_callback' => 'render_block_core_post_excerpt',

		)

	);

}

add_action( 'init', 'register_block_core_post_excerpt' );