1 files changed, 115 insertions, 0 deletions
diff --git a/vendor/sebastian/type/src/UnionType.php b/vendor/sebastian/type/src/UnionType.php
new file mode 100644
index 000000000..10c4a49b5
--- /dev/null
+++ b/vendor/sebastian/type/src/UnionType.php
@@ -0,0 +1,115 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/type.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Type;
+
+use function count;
+use function implode;
+use function sort;
+
+final class UnionType extends Type
+{
+    /**
+     * @psalm-var list<Type>
+     */
+    private $types;
+
+    /**
+     * @throws RuntimeException
+     */
+    public function __construct(Type ...$types)
+    {
+        $this->ensureMinimumOfTwoTypes(...$types);
+        $this->ensureOnlyValidTypes(...$types);
+
+        $this->types = $types;
+    }
+
+    public function isAssignable(Type $other): bool
+    {
+        foreach ($this->types as $type) {
+            if ($type->isAssignable($other)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public function asString(): string
+    {
+        return $this->name();
+    }
+
+    /**
+     * @deprecated
+     *
+     * @codeCoverageIgnore
+     */
+    public function getReturnTypeDeclaration(): string
+    {
+        return ': ' . $this->name();
+    }
+
+    public function name(): string
+    {
+        $types = [];
+
+        foreach ($this->types as $type) {
+            $types[] = $type->name();
+        }
+
+        sort($types);
+
+        return implode('|', $types);
+    }
+
+    public function allowsNull(): bool
+    {
+        foreach ($this->types as $type) {
+            if ($type instanceof NullType) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @throws RuntimeException
+     */
+    private function ensureMinimumOfTwoTypes(Type ...$types): void
+    {
+        if (count($types) < 2) {
+            throw new RuntimeException(
+                'A union type must be composed of at least two types'
+            );
+        }
+    }
+
+    /**
+     * @throws RuntimeException
+     */
+    private function ensureOnlyValidTypes(Type ...$types): void
+    {
+        foreach ($types as $type) {
+            if ($type instanceof UnknownType) {
+                throw new RuntimeException(
+                    'A union type must not be composed of an unknown type'
+                );
+            }
+
+            if ($type instanceof VoidType) {
+                throw new RuntimeException(
+                    'A union type must not be composed of a void type'
+                );
+            }
+        }
+    }
+}