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   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   */
  18  function 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   */
  78  function 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  }
  86  add_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   */
  94  if ( 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  }