first version

.gitignore

@@ -1,6 +1,4 @@
 composer.phar
 /vendor/
-
-# Commit your application's lock file http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file
-# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
-# composer.lock
+composer.lock
+.idea

composer.json

@@ -0,0 +1,20 @@
+{
+  "name": "bavix/diff",
+  "description": "diff",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "REZ1DENT3",
+      "email": "info@babichev.net"
+    }
+  ],
+  "autoload": {
+    "psr-4": {
+      "Bavix\\": "src/"
+    }
+  },
+  "require": {
+    "yetanotherape/diff-match-patch": "^1.0",
+    "bavix/exceptions": "^1.0"
+  }
+}

demo/differ.php

@@ -0,0 +1,11 @@
+<?php
+
+include_once dirname(__DIR__) . '/vendor/autoload.php';
+
+//$differ = new \Bavix\Diff\Differ();
+$differ = new \Bavix\Diff\Native();
+
+$patch = $differ->diff('foo', 'bar');
+
+print $patch . PHP_EOL;
+print $differ->patch('foo', $patch) . PHP_EOL . PHP_EOL;

src/Diff/Differ.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Bavix\Diff;
+
+use DiffMatchPatch\DiffMatchPatch;
+
+class Differ implements Driver
+{
+
+    /**
+     * @var DiffMatchPatch
+     */
+    protected $dmp;
+
+    /**
+     * Diff constructor.
+     */
+    public function __construct()
+    {
+        $this->dmp = new DiffMatchPatch();
+    }
+
+    /**
+     * @param string $oldData
+     * @param string $newData
+     *
+     * @return string
+     */
+    public function diff($oldData, $newData)
+    {
+        return $this->dmp->patch_toText(
+            $this->dmp->patch_make($oldData, $newData)
+        );
+    }
+
+    /**
+     * @param string $data
+     * @param string $patch
+     *
+     * @return string
+     */
+    public function patch($data, $patch)
+    {
+        return $this->dmp->patch_apply(
+            $this->dmp->patch_fromText($patch),
+            $data
+        )[0] ?? '';
+    }
+
+}

src/Diff/Driver.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Bavix\Diff;
+
+interface Driver
+{
+    public function diff($oldData, $newData);
+    public function patch($data, $patch);
+}

src/Diff/Native.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Bavix\Diff;
+
+use Bavix\Exceptions\Runtime;
+
+class Native implements Driver
+{
+
+    /**
+     * Native constructor.
+     *
+     * @throws Runtime
+     */
+    public function __construct()
+    {
+        if (!function_exists('xdiff_string_diff'))
+        {
+            throw new Runtime('Extension `xdiff` not found');
+        }
+    }
+
+    /**
+     * @param string $oldData
+     * @param string $newData
+     *
+     * @return string
+     */
+    public function diff($oldData, $newData)
+    {
+        return \xdiff_string_diff($oldData, $newData);
+    }
+
+    /**
+     * @param string $data
+     * @param string $patch
+     *
+     * @return string
+     */
+    public function patch($data, $patch)
+    {
+        return \xdiff_string_patch($data, $patch);
+    }
+
+}