(#3) - templating

modules/Templating/RsvTemplateRegistry.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Reservair\Templating;
+
+/** Holds the mapping from custom element tag names to their handlers. */
+class RsvTemplateRegistry {
+    /** @var array<string, RsvTemplateElement> */
+    private array $elements = [];
+
+    public function register(string $tag, RsvTemplateElement $element): void {
+        $this->elements[$tag] = $element;
+    }
+
+    public function get(string $tag): ?RsvTemplateElement {
+        return $this->elements[$tag] ?? null;
+    }
+
+    /** @return array<string, RsvTemplateElement> */
+    public function all(): array {
+        return $this->elements;
+    }
+
+    /**
+     * Extends a wp_kses allowlist so the registered custom elements survive
+     * sanitization of admin HTML. Each element contributes its tag and the
+     * attributes it declares via symbols().
+     *
+     * @param array<string, mixed> $base A wp_kses allowed-html map to extend.
+     * @return array<string, mixed>
+     */
+    public function kses_allowed(array $base = []): array {
+        foreach ($this->elements as $tag => $element) {
+            $attributes = [];
+            foreach ($element->symbols() as $name) {
+                $attributes[$name] = true;
+            }
+            $base[$tag] = $attributes;
+        }
+        return $base;
+    }
+}