From eda778b328aa3d0d84acd9c6d7e93e66e9ab08e7 Mon Sep 17 00:00:00 2001
From: Mansoor <beingdeveloper96@gmail.com>
Date: Fri, 8 Mar 2024 19:25:58 +0500
Subject: [PATCH 1/2] Feat/Add getStatistics method to Diff class

---
 src/Diff.php       | 34 ++++++++++++++++++++-
 tests/DiffTest.php | 73 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+), 1 deletion(-)

diff --git a/src/Diff.php b/src/Diff.php
index 713e7d8..6874b94 100644
--- a/src/Diff.php
+++ b/src/Diff.php
@@ -3,6 +3,8 @@
 namespace Overtrue\LaravelVersionable;
 
 use Illuminate\Support\Arr;
+use Illuminate\Support\Collection;
+use Jfcherng\Diff\Differ;
 use Jfcherng\Diff\DiffHelper;
 
 /**
@@ -58,7 +60,7 @@ public function toSideBySideHtml(array $differOptions = [], array $renderOptions
         return $this->render('SideBySide', $differOptions, $renderOptions);
     }
 
-    public function render(?string $renderer = null, array $differOptions = [], array $renderOptions = []): array
+    public function render(string $renderer = null, array $differOptions = [], array $renderOptions = []): array
     {
         if (empty($differOptions)) {
             $differOptions = $this->differOptions;
@@ -92,4 +94,34 @@ public function render(?string $renderer = null, array $differOptions = [], arra
 
         return $diff;
     }
+
+    public function getStatistics(array $differOptions = []): array
+    {
+        if (empty($differOptions)) {
+            $differOptions = $this->differOptions;
+        }
+
+        $oldContents = $this->fromVersion->contents;
+        $newContents = $this->toVersion->contents;
+
+        $diffStats = new Collection;
+
+        foreach ($oldContents as $key => $value) {
+            if ($newContents[$key] !== $oldContents[$key]) {
+                $diffStats->push(
+                    (new Differ(
+                        explode("\n", $newContents[$key]),
+                        explode("\n", $oldContents[$key]),
+                    ))->getStatistics()
+                );
+            }
+        }
+
+        return [
+            'inserted' => $diffStats->sum('inserted'),
+            'deleted' => $diffStats->sum('deleted'),
+            'unmodified' => $diffStats->sum('unmodified'),
+            'changedRatio' => $diffStats->sum('changedRatio'),
+        ];
+    }
 }
diff --git a/tests/DiffTest.php b/tests/DiffTest.php
index 7c0fe60..33ad189 100644
--- a/tests/DiffTest.php
+++ b/tests/DiffTest.php
@@ -140,6 +140,79 @@ public function test_diff_to_side_by_side_html()
         );
     }
 
+    /**
+     * @test
+     */
+    public function it_can_return_the_diff_statistics()
+    {
+        $old = new Version(['contents' => ['title' => 'example title', 'content' => 'example content']]);
+
+        // we are modifying everything
+        $new = new Version(['contents' => ['title' => 'changing the title', 'content' => 'changing the content']]);
+
+        $stats = (new Diff($new, $old))->getStatistics();
+
+        $this->assertIsArray($stats);
+        $this->assertArrayHasKey('inserted', $stats);
+        $this->assertArrayHasKey('deleted', $stats);
+        $this->assertArrayHasKey('unmodified', $stats);
+
+        $this->assertEquals(2, $stats['inserted']); // two new lines inserted
+        $this->assertEquals(2, $stats['deleted']); // two lines deleted
+        $this->assertEquals(0, $stats['unmodified']); // modified everything
+    }
+
+    /**
+     * @test
+     */
+    public function it_can_return_correct_statistics_for_new_line_insertions()
+    {
+        $old = new Version(['contents' => ['title' => 'example title', 'content' => 'example content']]);
+
+        // we are adding two new lines
+        $new = new Version(['contents' => ['content' => "example content\n adding new line \n another new line"]]);
+
+        $stats = (new Diff($new, $old))->getStatistics();
+
+        $this->assertEquals(2, $stats['inserted']); // two new lines inserted
+        $this->assertEquals(0, $stats['deleted']); // no deletions
+        $this->assertEquals(1, $stats['unmodified']); // one line unmodified
+    }
+
+    /**
+     * @test
+     */
+    public function it_can_return_correct_statistics_for_deleted_lines()
+    {
+        $old = new Version(['contents' => ['title' => 'example title', 'content' => "example content\n adding new line \n another new line"]]);
+
+        // we are removing last two lines
+        $new = new Version(['contents' => ['content' => 'example content']]);
+
+        $stats = (new Diff($new, $old))->getStatistics();
+
+        $this->assertEquals(0, $stats['inserted']); // no insertions
+        $this->assertEquals(2, $stats['deleted']); // two lines deleted
+        $this->assertEquals(1, $stats['unmodified']); // one line unmodified
+    }
+
+    /**
+     * @test
+     */
+    public function it_can_return_correct_statistics_for_unmodified_lines()
+    {
+        $old = new Version(['contents' => ['title' => 'example title', 'content' => "example content\n adding new line \n another new line"]]);
+
+        // we are just removing the last line
+        $new = new Version(['contents' => ['content' => "example content\n adding new line "]]);
+
+        $stats = (new Diff($new, $old))->getStatistics();
+
+        $this->assertEquals(0, $stats['inserted']); // no insertions
+        $this->assertEquals(1, $stats['deleted']); // one line deleted
+        $this->assertEquals(2, $stats['unmodified']); // two lines unmodified
+    }
+
     public function test_diff_nested_array_to_array()
     {
         $oldContent = [

From 9f99034777bc1e630f733a12e2dd0a954e1b3f63 Mon Sep 17 00:00:00 2001
From: Mansoor <beingdeveloper96@gmail.com>
Date: Fri, 8 Mar 2024 19:32:22 +0500
Subject: [PATCH 2/2] fix code styling

---
 src/Diff.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Diff.php b/src/Diff.php
index 6874b94..7c0e11c 100644
--- a/src/Diff.php
+++ b/src/Diff.php
@@ -60,7 +60,7 @@ public function toSideBySideHtml(array $differOptions = [], array $renderOptions
         return $this->render('SideBySide', $differOptions, $renderOptions);
     }
 
-    public function render(string $renderer = null, array $differOptions = [], array $renderOptions = []): array
+    public function render(?string $renderer = null, array $differOptions = [], array $renderOptions = []): array
     {
         if (empty($differOptions)) {
             $differOptions = $this->differOptions;