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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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* @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 = isset( $attributes['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( array( 'class' => $classes ) ); |
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// Set default values. |
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$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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// 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">' . esc_html( $label ) . '</span> %link'; |
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} |
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$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">' . esc_html( $label ) . '</span> <span class="post-navigation-link__title">%title</title>'; |
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} else { |
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/* |
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* If the label link option is enabled and there is no custom label, |
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* add a colon between the label and the post title. |
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*/ |
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$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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esc_html( $label ), |
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'%title' |
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); |
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} |
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} |
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} |
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|
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// The dynamic portion of the function name, `$navigation_type`, |
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// refers to the type of adjacency, 'next' or 'previous'. |
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$get_link_function = "get_{$navigation_type}_post_link"; |
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$content = $get_link_function( $format, $link ); |
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return sprintf( |
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'<div %1$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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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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|
