1<?php
  2/**
  3 * Server-side rendering of the `core/post-excerpt` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 * Renders the `core/post-excerpt` block on the server.
 10 *
 11 * @since 5.8.0
 12 *
 13 * @param array    $attributes Block attributes.
 14 * @param string   $content    Block default content.
 15 * @param WP_Block $block      Block instance.
 16 * @return string Returns the filtered post excerpt for the current post wrapped inside "p" tags.
 17 */
 18function render_block_core_post_excerpt( $attributes, $content, $block ) {
 19	if ( ! isset( $block->context['postId'] ) ) {
 20		return '';
 21	}
 22
 23	$more_text           = ! empty( $attributes['moreText'] ) ? '<a class="wp-block-post-excerpt__more-link" href="' . esc_url( get_the_permalink( $block->context['postId'] ) ) . '">' . wp_kses_post( $attributes['moreText'] ) . '</a>' : '';
 24	$filter_excerpt_more = static function ( $more ) use ( $more_text ) {
 25		return empty( $more_text ) ? $more : '';
 26	};
 27	/**
 28	 * Some themes might use `excerpt_more` filter to handle the
 29	 * `more` link displayed after a trimmed excerpt. Since the
 30	 * block has a `more text` attribute we have to check and
 31	 * override if needed the return value from this filter.
 32	 * So if the block's attribute is not empty override the
 33	 * `excerpt_more` filter and return nothing. This will
 34	 * result in showing only one `read more` link at a time.
 35	 *
 36	 * This hook needs to be applied before the excerpt is retrieved with get_the_excerpt.
 37	 * Otherwise, the read more link filter from the theme is not removed.
 38	 */
 39	add_filter( 'excerpt_more', $filter_excerpt_more );
 40
 41	/*
 42	* The purpose of the excerpt length setting is to limit the length of both
 43	* automatically generated and user-created excerpts.
 44	* Because the excerpt_length filter only applies to auto generated excerpts,
 45	* wp_trim_words is used instead.
 46	*/
 47	$excerpt_length = $attributes['excerptLength'];
 48	$excerpt        = get_the_excerpt( $block->context['postId'] );
 49	if ( isset( $excerpt_length ) ) {
 50		$excerpt = wp_trim_words( $excerpt, $excerpt_length );
 51	}
 52
 53	$classes = array();
 54	if ( isset( $attributes['textAlign'] ) ) {
 55		$classes[] = 'has-text-align-' . $attributes['textAlign'];
 56	}
 57	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
 58		$classes[] = 'has-link-color';
 59	}
 60	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );
 61
 62	$content               = '<p class="wp-block-post-excerpt__excerpt">' . $excerpt;
 63	$show_more_on_new_line = ! isset( $attributes['showMoreOnNewLine'] ) || $attributes['showMoreOnNewLine'];
 64	if ( $show_more_on_new_line && ! empty( $more_text ) ) {
 65		$content .= '</p><p class="wp-block-post-excerpt__more-text">' . $more_text . '</p>';
 66	} else {
 67		$content .= " $more_text</p>";
 68	}
 69	remove_filter( 'excerpt_more', $filter_excerpt_more );
 70	return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $content );
 71}
 72
 73/**
 74 * Registers the `core/post-excerpt` block on the server.
 75 *
 76 * @since 5.8.0
 77 */
 78function register_block_core_post_excerpt() {
 79	register_block_type_from_metadata(
 80		__DIR__ . '/post-excerpt',
 81		array(
 82			'render_callback' => 'render_block_core_post_excerpt',
 83		)
 84	);
 85}
 86add_action( 'init', 'register_block_core_post_excerpt' );
 87
 88/**
 89 * If themes or plugins filter the excerpt_length, we need to
 90 * override the filter in the editor, otherwise
 91 * the excerpt length block setting has no effect.
 92 * Returns 100 because 100 is the max length in the setting.
 93 */
 94if ( is_admin() ||
 95	defined( 'REST_REQUEST' ) && REST_REQUEST ) {
 96	add_filter(
 97		'excerpt_length',
 98		static function () {
 99			return 100;
100		},
101		PHP_INT_MAX
102	);
103}
104