Refactor from/toString methods to codecs

src/Codec/StringCodec.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Rhumsaa\Uuid\Codec;
+
+use InvalidArgumentException;
+use Rhumsaa\Uuid\Codec;
+use Rhumsaa\Uuid\UuidInterface;
+use Rhumsaa\Uuid\Uuid;
+
+class StringCodec implements Codec
+{
+
+    public function encode(UuidInterface $uuid)
+    {
+        $fields = array_values($uuid->getFieldsHex());
+
+        return vsprintf(
+            '%08s-%04s-%04s-%02s%02s-%012s',
+            $fields
+        );
+    }
+
+    public function decode($encodedUuid)
+    {
+        $nameParsed = str_replace(array(
+            'urn:',
+            'uuid:',
+            '{',
+            '}',
+            '-'
+        ), '', $encodedUuid);
+
+        // We have stripped out the dashes and are breaking up the string using
+        // substr(). In this way, we can accept a full hex value that doesn't
+        // contain dashes.
+        $components = array(
+            substr($nameParsed, 0, 8),
+            substr($nameParsed, 8, 4),
+            substr($nameParsed, 12, 4),
+            substr($nameParsed, 16, 4),
+            substr($nameParsed, 20)
+        );
+
+        $nameParsed = implode('-', $components);
+
+        if (! Uuid::isValid($nameParsed)) {
+            throw new InvalidArgumentException('Invalid UUID string: ' . $name);
+        }
+
+        $fields = array(
+            'time_low' => sprintf('%08s', $components[0]),
+            'time_mid' => sprintf('%04s', $components[1]),
+            'time_hi_and_version' => sprintf('%04s', $components[2]),
+            'clock_seq_hi_and_reserved' => sprintf('%02s', substr($components[3], 0, 2)),
+            'clock_seq_low' => sprintf('%02s', substr($components[3], 2)),
+            'node' => sprintf('%012s', $components[4])
+        );
+
+        return new Uuid($fields, $this);
+    }
+
+    public function decodeBytes($bytes)
+    {
+        if (strlen($bytes) !== 16) {
+            throw new InvalidArgumentException('$bytes string should contain 16 characters.');
+        }
+
+        $hexUuid = unpack('H*', $bytes);
+
+        return $this->decode($hexUuid);
+    }
+}