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1 <?php |
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2 /** |
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3 * Server-side rendering of the `core/post-navigation-link` block. |
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4 * |
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5 * @package WordPress |
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6 */ |
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7 |
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8 /** |
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9 * Renders the `core/post-navigation-link` block on the server. |
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10 * |
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11 * @param array $attributes Block attributes. |
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12 * @param string $content Block default content. |
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13 * |
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14 * @return string Returns the next or previous post link that is adjacent to the current post. |
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15 */ |
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16 function render_block_core_post_navigation_link( $attributes, $content ) { |
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17 if ( ! is_singular() ) { |
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18 return ''; |
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19 } |
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20 |
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21 // Get the navigation type to show the proper link. Available options are `next|previous`. |
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22 $navigation_type = isset( $attributes['type'] ) ? $attributes['type'] : 'next'; |
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23 // Allow only `next` and `previous` in `$navigation_type`. |
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24 if ( ! in_array( $navigation_type, array( 'next', 'previous' ), true ) ) { |
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25 return ''; |
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26 } |
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27 $classes = "post-navigation-link-$navigation_type"; |
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28 if ( isset( $attributes['textAlign'] ) ) { |
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29 $classes .= " has-text-align-{$attributes['textAlign']}"; |
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30 } |
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31 $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) ); |
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32 // Set default values. |
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33 $format = '%link'; |
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34 $link = 'next' === $navigation_type ? _x( 'Next', 'label for next post link' ) : _x( 'Previous', 'label for previous post link' ); |
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35 $label = ''; |
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36 |
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37 // If a custom label is provided, make this a link. |
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38 // `$label` is used to prepend the provided label, if we want to show the page title as well. |
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39 if ( isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ) { |
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40 $label = "{$attributes['label']}"; |
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41 $link = $label; |
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42 } |
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43 |
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44 // If we want to also show the page title, make the page title a link and prepend the label. |
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45 if ( isset( $attributes['showTitle'] ) && $attributes['showTitle'] ) { |
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46 /* |
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47 * If the label link option is not enabled but there is a custom label, |
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48 * display the custom label as text before the linked title. |
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49 */ |
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50 if ( ! $attributes['linkLabel'] ) { |
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51 if ( $label ) { |
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52 $format = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> %link'; |
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53 } |
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54 $link = '%title'; |
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55 } elseif ( isset( $attributes['linkLabel'] ) && $attributes['linkLabel'] ) { |
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56 // If the label link option is enabled and there is a custom label, display it before the title. |
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57 if ( $label ) { |
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58 $link = '<span class="post-navigation-link__label">' . wp_kses_post( $label ) . '</span> <span class="post-navigation-link__title">%title</span>'; |
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59 } else { |
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60 /* |
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61 * If the label link option is enabled and there is no custom label, |
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62 * add a colon between the label and the post title. |
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63 */ |
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64 $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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65 $link = sprintf( |
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66 '<span class="post-navigation-link__label">%1$s</span> <span class="post-navigation-link__title">%2$s</span>', |
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67 wp_kses_post( $label ), |
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68 '%title' |
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69 ); |
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70 } |
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71 } |
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72 } |
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73 |
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74 // The dynamic portion of the function name, `$navigation_type`, |
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75 // refers to the type of adjacency, 'next' or 'previous'. |
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76 $get_link_function = "get_{$navigation_type}_post_link"; |
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77 $content = $get_link_function( $format, $link ); |
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78 return sprintf( |
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79 '<div %1$s>%2$s</div>', |
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80 $wrapper_attributes, |
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81 $content |
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82 ); |
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83 } |
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84 |
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85 /** |
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86 * Registers the `core/post-navigation-link` block on the server. |
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87 */ |
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88 function register_block_core_post_navigation_link() { |
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89 register_block_type_from_metadata( |
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90 __DIR__ . '/post-navigation-link', |
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91 array( |
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92 'render_callback' => 'render_block_core_post_navigation_link', |
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93 ) |
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94 ); |
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95 } |
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96 add_action( 'init', 'register_block_core_post_navigation_link' ); |