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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      /*
  24      * The purpose of the excerpt length setting is to limit the length of both
  25      * automatically generated and user-created excerpts.
  26      * Because the excerpt_length filter only applies to auto generated excerpts,
  27      * wp_trim_words is used instead.
  28      */
  29      $excerpt_length = $attributes['excerptLength'];
  30      $excerpt        = get_the_excerpt( $block->context['postId'] );
  31      if ( isset( $excerpt_length ) ) {
  32          $excerpt = wp_trim_words( $excerpt, $excerpt_length );
  33      }
  34  
  35      $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>' : '';
  36      $filter_excerpt_more = static function ( $more ) use ( $more_text ) {
  37          return empty( $more_text ) ? $more : '';
  38      };
  39      /**
  40       * Some themes might use `excerpt_more` filter to handle the
  41       * `more` link displayed after a trimmed excerpt. Since the
  42       * block has a `more text` attribute we have to check and
  43       * override if needed the return value from this filter.
  44       * So if the block's attribute is not empty override the
  45       * `excerpt_more` filter and return nothing. This will
  46       * result in showing only one `read more` link at a time.
  47       */
  48      add_filter( 'excerpt_more', $filter_excerpt_more );
  49      $classes = array();
  50      if ( isset( $attributes['textAlign'] ) ) {
  51          $classes[] = 'has-text-align-' . $attributes['textAlign'];
  52      }
  53      if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
  54          $classes[] = 'has-link-color';
  55      }
  56      $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );
  57  
  58      $content               = '<p class="wp-block-post-excerpt__excerpt">' . $excerpt;
  59      $show_more_on_new_line = ! isset( $attributes['showMoreOnNewLine'] ) || $attributes['showMoreOnNewLine'];
  60      if ( $show_more_on_new_line && ! empty( $more_text ) ) {
  61          $content .= '</p><p class="wp-block-post-excerpt__more-text">' . $more_text . '</p>';
  62      } else {
  63          $content .= " $more_text</p>";
  64      }
  65      remove_filter( 'excerpt_more', $filter_excerpt_more );
  66      return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $content );
  67  }
  68  
  69  /**
  70   * Registers the `core/post-excerpt` block on the server.
  71   *
  72   * @since 5.8.0
  73   */
  74  function register_block_core_post_excerpt() {
  75      register_block_type_from_metadata(
  76          __DIR__ . '/post-excerpt',
  77          array(
  78              'render_callback' => 'render_block_core_post_excerpt',
  79          )
  80      );
  81  }
  82  add_action( 'init', 'register_block_core_post_excerpt' );
  83  
  84  /**
  85   * If themes or plugins filter the excerpt_length, we need to
  86   * override the filter in the editor, otherwise
  87   * the excerpt length block setting has no effect.
  88   * Returns 100 because 100 is the max length in the setting.
  89   */
  90  if ( is_admin() ||
  91      defined( 'REST_REQUEST' ) && REST_REQUEST ) {
  92      add_filter(
  93          'excerpt_length',
  94          static function () {
  95              return 100;
  96          },
  97          PHP_INT_MAX
  98      );
  99  }