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class-schema-graph.php
69 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Schema.org `@graph` document assembler. |
| 4 | * |
| 5 | * Collects the individual JSON-LD nodes that apply to the current request |
| 6 | * (site-level entities such as Organization plus the page node such as Article) |
| 7 | * and serializes them into a single `@graph` document. This is the reusable |
| 8 | * foundation the site-level schema types build on: each node builder returns an |
| 9 | * array (or null when it has nothing valid to emit), and the graph stitches the |
| 10 | * non-empty ones together. |
| 11 | * |
| 12 | * @package automattic/jetpack-seo-package |
| 13 | */ |
| 14 | |
| 15 | namespace Automattic\Jetpack\SEO; |
| 16 | |
| 17 | /** |
| 18 | * Accumulates schema nodes and renders the `@graph` document. |
| 19 | */ |
| 20 | class Schema_Graph { |
| 21 | |
| 22 | /** |
| 23 | * Collected nodes, in insertion order. |
| 24 | * |
| 25 | * @var array<int, array> |
| 26 | */ |
| 27 | private $nodes = array(); |
| 28 | |
| 29 | /** |
| 30 | * Add a node to the graph. Null/empty nodes are ignored, so callers can pass |
| 31 | * a builder result straight through without guarding it first. |
| 32 | * |
| 33 | * @param array|null $node A JSON-LD node, or null/empty to skip. |
| 34 | * @return static The graph, for chaining. |
| 35 | */ |
| 36 | public function add( $node ) { |
| 37 | if ( is_array( $node ) && ! empty( $node ) ) { |
| 38 | $this->nodes[] = $node; |
| 39 | } |
| 40 | return $this; |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Whether the graph has no nodes to emit. |
| 45 | * |
| 46 | * @return bool |
| 47 | */ |
| 48 | public function is_empty() { |
| 49 | return empty( $this->nodes ); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Render the full JSON-LD document, or null when there is nothing to emit so |
| 54 | * the caller can skip output entirely rather than print an empty graph. |
| 55 | * |
| 56 | * @return array|null |
| 57 | */ |
| 58 | public function to_document() { |
| 59 | if ( $this->is_empty() ) { |
| 60 | return null; |
| 61 | } |
| 62 | |
| 63 | return array( |
| 64 | '@context' => 'https://schema.org', |
| 65 | '@graph' => array_values( $this->nodes ), |
| 66 | ); |
| 67 | } |
| 68 | } |
| 69 |