Add an array importer and its tests.

Author: drupol

spec/drupol/phptree/Importer/SimpleArraySpec.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace spec\drupol\phptree\Importer;
+
+use drupol\phptree\Importer\SimpleArray;
+use drupol\phptree\Node\NodeInterface;
+use PhpSpec\ObjectBehavior;
+
+class SimpleArraySpec extends ObjectBehavior
+{
+    public function it_is_initializable()
+    {
+        $this->shouldHaveType(SimpleArray::class);
+    }
+
+    public function it_can_import()
+    {
+        $array = [
+            'value' => 'root',
+            'children' => [
+                0 => [
+                    'value' => 'child1',
+                ],
+                1 => [
+                    'value' => 'child2',
+                ],
+            ],
+        ];
+
+        $this
+            ->import($array)
+            ->shouldImplement(NodeInterface::class);
+
+        $this
+            ->import($array)
+            ->count()
+            ->shouldReturn(2);
+
+        $this
+            ->import($array)
+            ->isRoot()
+            ->shouldReturn(TRUE);
+    }
+}

src/Importer/SimpleArray.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace drupol\phptree\Importer;
+
+use drupol\phptree\Node\Node;
+use drupol\phptree\Node\NodeInterface;
+
+/**
+ * Class SimpleArray
+ */
+class SimpleArray implements ImporterInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function import($data): NodeInterface
+    {
+        return $this->arrayToTree($data);
+    }
+
+    /**
+     * Convert an array into a tree.
+     *
+     * @param array $data
+     *
+     * @return \drupol\phptree\Node\NodeInterface
+     *   The tree.
+     */
+    protected function arrayToTree(array $data): NodeInterface
+    {
+        $data += [
+            'children' => [],
+        ];
+
+        $node = $this->createNode($data['value']);
+
+        foreach ($data['children'] as $key => $child) {
+            $node->add($this->arrayToTree($child));
+        }
+
+        return $node;
+    }
+
+    /**
+     * Create a node.
+     *
+     * @param mixed $data
+     *   The arguments.
+     *
+     * @return \drupol\phptree\Node\NodeInterface
+     *   The node.
+     */
+    protected function createNode($data): NodeInterface
+    {
+        return new Node();
+    }
+}