feat: add abstract base Pretty class

Author: adhocore

src/Pretty.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the CLI-SYNTAX package.
+ *
+ * (c) Jitendra Adhikari <[email protected]>
+ *     <https://github.com/adhocore>
+ *
+ * Licensed under MIT license.
+ */
+
+namespace Ahc\CliSyntax;
+
+abstract class Pretty
+{
+    /** @var string The PHP code. */
+    protected $code;
+
+    /** @var bool Indicates if it has been already configured. */
+    protected static $configured;
+
+    public function __construct(string $code = null)
+    {
+        $this->code = $code ?? '';
+    }
+
+    public static function for(string $file): self
+    {
+        if (!\is_file($file)) {
+            throw new \InvalidArgumentException('The given file doesnot exist or is unreadable.');
+        }
+
+        return new static(\file_get_contents($file));
+    }
+
+    public static function configure()
+    {
+        if (static::$configured) {
+            return;
+        }
+
+        foreach (['comment', 'default', 'html', 'keyword', 'string'] as $type) {
+            \ini_set("highlight.$type", \ini_get("highlight.$type") . \sprintf('" data-type="%s', $type));
+        }
+
+        static::$configured = true;
+    }
+
+    protected function parse(string $code = null)
+    {
+        static::configure();
+
+        $html = \highlight_string($code ?? $this->code, true);
+        $html = \str_replace('<br />', "\n", $html);
+
+        $dom = new \DOMDocument;
+        $dom->loadHTML($html);
+
+        foreach ($dom->getElementsByTagName('span') as $el) {
+            if ('html' !== $el->getAttribute('data-type')) {
+                $this->visit($el);
+            }
+        }
+    }
+
+    abstract protected function visit(\DOMElement $el);
+}