renderer

Author: sokil

.gitignore

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+vendor

composer.json

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+{
+    "require": {
+        "sebastian/diff": "^1.4"
+    },
+    "autoload": {
+        "psr-4": {
+            "Sokil\\Diff\\": "src/"
+        }
+    }
+}

composer.lock

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+<?php
+
+namespace Sokil\Diff;
+
+use SebastianBergmann\Diff\Differ;
+
+class Renderer
+{
+    private $differ;
+
+    public function __construct()
+    {
+        $this->differ = new Differ('', false);
+    }
+
+    /**
+     * @param array|string $from
+     * @param array|string $to
+     * @return string highlighted diff
+     */
+    public function render($from, $to)
+    {
+        $diff = $this->differ->diffToArray($from, $to);
+
+        foreach ($diff as &$line) {
+            switch ($line[1]) {
+                case 0: // NOT CHANGED
+                    $line = $line[0];
+                    break;
+                case 1: // ADDED
+                    $line = '<ins>' . $line[0] . '</ins>';
+                    break;
+                case 2: // REMOVED
+                    $line = '<del>' . $line[0] . '</del>';
+                    break;
+            }
+        }
+
+        return implode(PHP_EOL, $diff);
+    }
+}

src/Renderer.php

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+<?php
+
+namespace Sokil\Diff;
+
+class RendererTest extends \PHPUnit_Framework_TestCase
+{
+    public function testRender()
+    {
+        $expectedDiff = implode(PHP_EOL, [
+            'line1',
+            '<del>line2</del>',
+            '<ins>line2changed</ins>',
+            'line3'
+        ]);
+
+        $diffRenderer = new Renderer();
+        $actualDiff = $diffRenderer->render(
+            implode(PHP_EOL, ['line1', 'line2', 'line3']),
+            implode(PHP_EOL, ['line1', 'line2changed', 'line3'])
+        );
+
+        $this->assertEquals($expectedDiff, $actualDiff);
+    }
+}

tests/RendererTest.php

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+<?xml version="1.0"?>
+<phpunit colors="true" bootstrap="../vendor/autoload.php">
+    <testsuites>
+        <testsuite name="AllTests">
+            <directory>.</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>