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vendor/symfony/form/AbstractExtension.php

@@ -0,0 +1,198 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form;
+
+use Symfony\Component\Form\Exception\InvalidArgumentException;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+abstract class AbstractExtension implements FormExtensionInterface
+{
+    /**
+     * The types provided by this extension.
+     *
+     * @var FormTypeInterface[]
+     */
+    private $types;
+
+    /**
+     * The type extensions provided by this extension.
+     *
+     * @var FormTypeExtensionInterface[][]
+     */
+    private $typeExtensions;
+
+    /**
+     * The type guesser provided by this extension.
+     *
+     * @var FormTypeGuesserInterface|null
+     */
+    private $typeGuesser;
+
+    /**
+     * Whether the type guesser has been loaded.
+     *
+     * @var bool
+     */
+    private $typeGuesserLoaded = false;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getType(string $name)
+    {
+        if (null === $this->types) {
+            $this->initTypes();
+        }
+
+        if (!isset($this->types[$name])) {
+            throw new InvalidArgumentException(sprintf('The type "%s" cannot be loaded by this extension.', $name));
+        }
+
+        return $this->types[$name];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasType(string $name)
+    {
+        if (null === $this->types) {
+            $this->initTypes();
+        }
+
+        return isset($this->types[$name]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTypeExtensions(string $name)
+    {
+        if (null === $this->typeExtensions) {
+            $this->initTypeExtensions();
+        }
+
+        return $this->typeExtensions[$name]
+            ?? [];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasTypeExtensions(string $name)
+    {
+        if (null === $this->typeExtensions) {
+            $this->initTypeExtensions();
+        }
+
+        return isset($this->typeExtensions[$name]) && \count($this->typeExtensions[$name]) > 0;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTypeGuesser()
+    {
+        if (!$this->typeGuesserLoaded) {
+            $this->initTypeGuesser();
+        }
+
+        return $this->typeGuesser;
+    }
+
+    /**
+     * Registers the types.
+     *
+     * @return FormTypeInterface[]
+     */
+    protected function loadTypes()
+    {
+        return [];
+    }
+
+    /**
+     * Registers the type extensions.
+     *
+     * @return FormTypeExtensionInterface[]
+     */
+    protected function loadTypeExtensions()
+    {
+        return [];
+    }
+
+    /**
+     * Registers the type guesser.
+     *
+     * @return FormTypeGuesserInterface|null
+     */
+    protected function loadTypeGuesser()
+    {
+        return null;
+    }
+
+    /**
+     * Initializes the types.
+     *
+     * @throws UnexpectedTypeException if any registered type is not an instance of FormTypeInterface
+     */
+    private function initTypes()
+    {
+        $this->types = [];
+
+        foreach ($this->loadTypes() as $type) {
+            if (!$type instanceof FormTypeInterface) {
+                throw new UnexpectedTypeException($type, FormTypeInterface::class);
+            }
+
+            $this->types[\get_class($type)] = $type;
+        }
+    }
+
+    /**
+     * Initializes the type extensions.
+     *
+     * @throws UnexpectedTypeException if any registered type extension is not
+     *                                 an instance of FormTypeExtensionInterface
+     */
+    private function initTypeExtensions()
+    {
+        $this->typeExtensions = [];
+
+        foreach ($this->loadTypeExtensions() as $extension) {
+            if (!$extension instanceof FormTypeExtensionInterface) {
+                throw new UnexpectedTypeException($extension, FormTypeExtensionInterface::class);
+            }
+
+            foreach ($extension::getExtendedTypes() as $extendedType) {
+                $this->typeExtensions[$extendedType][] = $extension;
+            }
+        }
+    }
+
+    /**
+     * Initializes the type guesser.
+     *
+     * @throws UnexpectedTypeException if the type guesser is not an instance of FormTypeGuesserInterface
+     */
+    private function initTypeGuesser()
+    {
+        $this->typeGuesserLoaded = true;
+
+        $this->typeGuesser = $this->loadTypeGuesser();
+        if (null !== $this->typeGuesser && !$this->typeGuesser instanceof FormTypeGuesserInterface) {
+            throw new UnexpectedTypeException($this->typeGuesser, FormTypeGuesserInterface::class);
+        }
+    }
+}