implement link parser class

src/Parser/Line/Link.php

@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Gemtext\Parser\Line;
+
+class Link
+{
+    public static function match(
+        \Yggverse\Gemtext\Entity\Line $line,
+        array &$matches = []
+    ): bool
+    {
+        if ($line->isEscaped())
+        {
+            return false;
+        }
+
+        return (bool) preg_match(
+            '/^=>\s*(?<address>[^\s]+)(\s(?<date>\d{4}-\d{2}-\d{2}))?(\s(?<alt>.+))?$/m',
+            $line->getData(),
+            $matches
+        );
+    }
+
+    public static function getAddress(
+        \Yggverse\Gemtext\Entity\Line $line
+    ): ?string
+    {
+        $matches = [];
+
+        if (self::match($line, $matches))
+        {
+            if (isset($matches['address']))
+            {
+                $address = trim(
+                    $matches['address']
+                );
+
+                if ($address)
+                {
+                    return $address;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    public static function getDate(
+        \Yggverse\Gemtext\Entity\Line $line
+    ): ?string
+    {
+        $matches = [];
+
+        if (self::match($line, $matches))
+        {
+            if (isset($matches['date']))
+            {
+                $date = trim(
+                    $matches['date']
+                );
+
+                if ($date)
+                {
+                    return $date;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    public static function getAlt(
+        \Yggverse\Gemtext\Entity\Line $line
+    ): ?string
+    {
+        $matches = [];
+
+        if (self::match($line, $matches))
+        {
+            if (isset($matches['alt']))
+            {
+                $alt = trim(
+                    $matches['alt']
+                );
+
+                if ($alt)
+                {
+                    return $alt;
+                }
+            }
+        }
+
+        return null;
+    }
+}