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<?php |
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/** |
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* Server-side rendering of the `core/post-navigation-link` block. |
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* |
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* @package WordPress |
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*/ |
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|
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/** |
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* Renders the `core/post-navigation-link` block on the server. |
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* |
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* @since 5.9.0 |
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* |
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* @param array $attributes Block attributes. |
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* @param string $content Block default content. |
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* |
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* @return string Returns the next or previous post link that is adjacent to the current post. |
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*/ |
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function gutenberg_render_block_core_post_navigation_link( $attributes, $content ) { |
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if ( ! is_singular() ) { |
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return ''; |
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} |
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|
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// Get the navigation type to show the proper link. Available options are `next|previous`. |
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$navigation_type = $attributes['type'] ?? 'next'; |
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// Allow only `next` and `previous` in `$navigation_type`. |
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if ( ! in_array( $navigation_type, array( 'next', 'previous' ), true ) ) { |
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return ''; |
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} |
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$classes = "post-navigation-link-$navigation_type"; |
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if ( isset( $attributes['textAlign'] ) ) { |
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$classes .= " has-text-align-{$attributes['textAlign']}"; |
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} |
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$wrapper_attributes = get_block_wrapper_attributes( |
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array( |
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'class' => $classes, |
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) |
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); |
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// Set default values. |
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$format = '%link'; |
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$link = 'next' === $navigation_type ? _x( 'Next', 'label for next post link' ) : _x( 'Previous', 'label for previous post link' ); |
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$label = ''; |
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|
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// Only use hardcoded values here, otherwise we need to add escaping where these values are used. |
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$arrow_map = array( |
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'none' => '', |
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'arrow' => array( |
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'next' => '→', |
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'previous' => '←', |
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), |
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'chevron' => array( |
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'next' => '»', |
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'previous' => '«', |
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), |
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); |
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|
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// If a custom label is provided, make this a link. |
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// `$label` is used to prepend the provided label, if we want to show the page title as well. |
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if ( isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ) { |
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$label = "{$attributes['label']}"; |
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$link = $label; |
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} |
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|
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// If we want to also show the page title, make the page title a link and prepend the label. |
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if ( isset( $attributes['showTitle'] ) && $attributes['showTitle'] ) { |
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/* |
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* If the label link option is not enabled but there is a custom label, |
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* display the custom label as text before the linked title. |
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*/ |
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if ( ! $attributes['linkLabel'] ) { |
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if ( $label ) { |
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$format = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> %link'; |
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} |
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$link = '%title'; |
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} elseif ( isset( $attributes['linkLabel'] ) && $attributes['linkLabel'] ) { |
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// If the label link option is enabled and there is a custom label, display it before the title. |
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if ( $label ) { |
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$link = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> <span class="post-navigation-link__title">%title</span>'; |
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} else { |
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/* |
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* If the label link option is enabled and there is no custom label, |
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* add a colon between the label and the post title. |
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*/ |
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$label = 'next' === $navigation_type ? _x( 'Next:', 'label before the title of the next post' ) : _x( 'Previous:', 'label before the title of the previous post' ); |
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$link = sprintf( |
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'<span class="post-navigation-link__label">%1$s</span> <span class="post-navigation-link__title">%2$s</span>', |
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wp_kses_post( $label ), |
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'%title' |
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); |
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} |
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} |
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} |
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|
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// Display arrows. |
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if ( isset( $attributes['arrow'] ) && 'none' !== $attributes['arrow'] && isset( $arrow_map[ $attributes['arrow'] ] ) ) { |
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$arrow = $arrow_map[ $attributes['arrow'] ][ $navigation_type ]; |
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|
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if ( 'next' === $navigation_type ) { |
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$format = '%link<span class="wp-block-post-navigation-link__arrow-next is-arrow-' . $attributes['arrow'] . '" aria-hidden="true">' . $arrow . '</span>'; |
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} else { |
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$format = '<span class="wp-block-post-navigation-link__arrow-previous is-arrow-' . $attributes['arrow'] . '" aria-hidden="true">' . $arrow . '</span>%link'; |
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} |
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} |
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|
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/* |
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* The dynamic portion of the function name, `$navigation_type`, |
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* Refers to the type of adjacency, 'next' or 'previous'. |
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* |
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* @see https://developer.wordpress.org/reference/functions/get_previous_post_link/ |
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* @see https://developer.wordpress.org/reference/functions/get_next_post_link/ |
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*/ |
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$get_link_function = "get_{$navigation_type}_post_link"; |
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|
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if ( ! empty( $attributes['taxonomy'] ) ) { |
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$content = $get_link_function( $format, $link, true, '', $attributes['taxonomy'] ); |
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} else { |
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$content = $get_link_function( $format, $link ); |
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} |
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|
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return sprintf( |
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'<div %1$s>%2$s</div>', |
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$wrapper_attributes, |
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$content |
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); |
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} |
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|
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/** |
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* Registers the `core/post-navigation-link` block on the server. |
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* |
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* @since 5.9.0 |
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*/ |
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function gutenberg_register_block_core_post_navigation_link() { |
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register_block_type_from_metadata( |
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__DIR__ . '/post-navigation-link', |
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array( |
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'render_callback' => 'gutenberg_render_block_core_post_navigation_link', |
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) |
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); |
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} |
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add_action( 'init', 'gutenberg_register_block_core_post_navigation_link', 20 ); |
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|
