add plugins

user/plugins/form/classes/Forms.php

@@ -0,0 +1,92 @@
+<?php
+namespace Grav\Plugin\Form;
+
+use Grav\Common\Page\Interfaces\PageInterface;
+use Grav\Common\Page\Page;
+use Grav\Framework\Form\Interfaces\FormFactoryInterface;
+use Grav\Framework\Form\Interfaces\FormInterface;
+
+class Forms
+{
+    /** @var array|FormFactoryInterface[] */
+    private $types;
+    /** @var FormInterface|null */
+    private $form;
+
+    public function __construct()
+    {
+        $this->registerType('form', new FormFactory());
+    }
+
+    public function registerType(string $type, FormFactoryInterface $factory): void
+    {
+        $this->types[$type] = $factory;
+    }
+
+    public function unregisterType($type): void
+    {
+        unset($this->types[$type]);
+    }
+
+    public function hasType(string $type): bool
+    {
+        return isset($this->types[$type]);
+    }
+
+    public function getTypes(): array
+    {
+        return array_keys($this->types);
+    }
+
+    public function createPageForm(PageInterface $page, string $name = null, array $form = null): ?FormInterface
+    {
+        if (null === $form) {
+            [$name, $form] = $this->getPageParameters($page, $name);
+        }
+
+        if (null === $form) {
+            return null;
+        }
+
+        $type = $form['type'] ?? 'form';
+        $factory = $this->types[$type] ?? null;
+
+        if ($factory) {
+            if (method_exists($factory, 'createFormForPage')) {
+                return $factory->createFormForPage($page, $name, $form);
+            }
+
+            if ($page instanceof Page) {
+                return $factory->createPageForm($page, $name, $form);
+            }
+        }
+
+        return null;
+    }
+
+    public function getActiveForm(): ?FormInterface
+    {
+        return $this->form;
+    }
+
+    public function setActiveForm(FormInterface $form): void
+    {
+        $this->form = $form;
+    }
+
+    protected function getPageParameters(PageInterface $page, ?string $name): array
+    {
+        $forms = $page->forms();
+
+        if ($name) {
+            // If form with given name was found, use that.
+            $form = $forms[$name] ?? null;
+        } else {
+            // Otherwise pick up the first form.
+            $form = reset($forms) ?: null;
+            $name = (string)key($forms);
+        }
+
+        return [$name, $form];
+    }
+}