From 70f48a6c88bf50ac54353ab42a71fd1ef0fe7936 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Tue, 18 Dec 2018 10:03:53 +0100
Subject: [PATCH 1/4] Add TrieNode tree type.

---
 src/Node/TrieNode.php | 60 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/Node/TrieNode.php

diff --git a/src/Node/TrieNode.php b/src/Node/TrieNode.php
new file mode 100644
index 0000000..1f2586b
--- /dev/null
+++ b/src/Node/TrieNode.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace drupol\phptree\Node;
+
+/**
+ * Class TrieNode
+ */
+class TrieNode extends KeyValueNode
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function add(NodeInterface ...$nodes): NodeInterface
+    {
+        foreach ($nodes as $node) {
+            $data = $node->getValue();
+
+            $hash = \hash('sha256', $node->getKey() . $data);
+
+            $node = new TrieNode($hash, \substr($data, 0, 1));
+            $parent = $this->append($node);
+
+            $dataWithoutFirstLetter = \substr($data, 1);
+            if (!empty($dataWithoutFirstLetter)) {
+                $parent->add(new TrieNode($hash, $dataWithoutFirstLetter));
+            } else {
+                $nodes = [$node->getValue()];
+                foreach ($node->getAncestors() as $ancestor) {
+                    $nodes[] = $ancestor->getValue();
+                }
+                \array_pop($nodes);
+                $node->append(new TrieNode($hash, \strrev(\implode('', $nodes))));
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * @param \drupol\phptree\Node\ValueNodeInterface $node
+     *
+     * @return \drupol\phptree\Node\NodeInterface|\drupol\phptree\Node\ValueNodeInterface
+     */
+    private function append(ValueNodeInterface $node)
+    {
+        /** @var \drupol\phptree\Node\ValueNodeInterface $child */
+        foreach ($this->children() as $child) {
+            /** @var \drupol\phptree\Node\ValueNodeInterface $node */
+            if ($node->getValue() === $child->getValue()) {
+                return $child;
+            }
+        }
+
+        parent::add($node);
+
+        return $node;
+    }
+}

From d1658da9c8aa4377421430a32669e91b496bd8a8 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Tue, 18 Dec 2018 10:04:09 +0100
Subject: [PATCH 2/4] Add related tests.

---
 spec/drupol/phptree/Node/TrieNodeSpec.php | 42 +++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 spec/drupol/phptree/Node/TrieNodeSpec.php

diff --git a/spec/drupol/phptree/Node/TrieNodeSpec.php b/spec/drupol/phptree/Node/TrieNodeSpec.php
new file mode 100644
index 0000000..632b10c
--- /dev/null
+++ b/spec/drupol/phptree/Node/TrieNodeSpec.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace spec\drupol\phptree\Node;
+
+use drupol\phptree\Node\KeyValueNode;
+use drupol\phptree\Node\TrieNode;
+use PhpSpec\ObjectBehavior;
+
+class TrieNodeSpec extends ObjectBehavior
+{
+    public function it_is_initializable()
+    {
+        $this->shouldHaveType(TrieNode::class);
+    }
+
+    public function it_can_add_node()
+    {
+        $this->beConstructedWith('root', 'root');
+
+        $nodes = [
+            'ab',
+            'abc',
+            'abcd',
+            'abcde',
+            'cb',
+            'cba',
+            'dcba',
+            'edcba',
+        ];
+
+        foreach ($nodes as $key => $value) {
+            $nodes[$key] = new KeyValueNode($key, $value);
+        }
+
+        $this
+            ->add(...$nodes)
+            ->count()
+            ->shouldReturn(25);
+    }
+}

From 9dfd69ddc6f305dc626f254ec5d6a80ab3741c99 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Tue, 18 Dec 2018 10:04:36 +0100
Subject: [PATCH 3/4] Add a KeyValueGraph test class for displaying graphs with
 a key and a value.

---
 tests/src/Exporter/KeyValueGraph.php | 40 ++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tests/src/Exporter/KeyValueGraph.php

diff --git a/tests/src/Exporter/KeyValueGraph.php b/tests/src/Exporter/KeyValueGraph.php
new file mode 100644
index 0000000..c80cd95
--- /dev/null
+++ b/tests/src/Exporter/KeyValueGraph.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace drupol\phptree\tests\Exporter;
+
+use drupol\phptree\Node\NodeInterface;
+use Fhaculty\Graph\Vertex;
+
+/**
+ * Class KeyValueGraph
+ */
+class KeyValueGraph extends ValueGraph
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function createVertex(NodeInterface $node): Vertex
+    {
+        $vertex = parent::createVertex($node);
+
+        if (\method_exists($node, 'getValue') && \method_exists($node, 'getKey')) {
+            $vertex->setAttribute('graphviz.label', $node->getValue());
+        }
+
+        return $vertex;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function createVertexId(NodeInterface $node)
+    {
+        if (\method_exists($node, 'getValue') && \method_exists($node, 'getKey')) {
+            return $node->getKey() . $node->getValue();
+        }
+
+        return \sha1((string) parent::createVertexId($node));
+    }
+}

From b3bedaf76029886b5d3b8e3aebf55b7fdc7e85f2 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Wed, 19 Dec 2018 12:59:29 +0100
Subject: [PATCH 4/4] Update phpdoc.

---
 src/Exporter/Graph.php | 8 +-------
 src/Exporter/Text.php  | 8 +-------
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/src/Exporter/Graph.php b/src/Exporter/Graph.php
index c4dd65e..97f2920 100644
--- a/src/Exporter/Graph.php
+++ b/src/Exporter/Graph.php
@@ -59,13 +59,7 @@ public function getTraverser(): TraverserInterface
     }
 
     /**
-     * Export a node into a Graph.
-     *
-     * @param \drupol\phptree\Node\ValueNodeInterface $node
-     *   The node.
-     *
-     * @return \Fhaculty\Graph\Graph
-     *   The graph.
+     * {@inheritdoc}
      */
     public function export(ValueNodeInterface $node): OriginalGraph
     {
diff --git a/src/Exporter/Text.php b/src/Exporter/Text.php
index 2c9d514..1c5887e 100644
--- a/src/Exporter/Text.php
+++ b/src/Exporter/Text.php
@@ -12,13 +12,7 @@
 class Text implements ExporterInterface
 {
     /**
-     * Export the node in a string.
-     *
-     * @param \drupol\phptree\Node\ValueNodeInterface $node
-     *   The node.
-     *
-     * @return string
-     *   The string.
+     * {@inheritdoc}
      */
     public function export(ValueNodeInterface $node): string
     {