Initial commit

vendor/league/uri/UriTemplate/VarSpecifier.php

@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * League.Uri (https://uri.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Uri\UriTemplate;
+
+use League\Uri\Exceptions\SyntaxError;
+
+use function preg_match;
+
+/**
+ * @internal The class exposes the internal representation of a Var Specifier
+ * @link https://www.rfc-editor.org/rfc/rfc6570#section-2.3
+ */
+final class VarSpecifier
+{
+    /**
+     * Variables specification regular expression pattern.
+     *
+     * @link https://tools.ietf.org/html/rfc6570#section-2.3
+     */
+    private const REGEXP_VARSPEC = '/^(?<name>(?:[A-z0-9_\.]|%[0-9a-fA-F]{2})+)(?<modifier>\:(?<position>\d+)|\*)?$/';
+
+    private const MODIFIER_POSITION_MAX_POSITION = 10_000;
+
+    private function __construct(
+        public readonly string $name,
+        public readonly string $modifier,
+        public readonly int $position
+    ) {
+    }
+
+    public static function new(string $specification): self
+    {
+        if (1 !== preg_match(self::REGEXP_VARSPEC, $specification, $parsed)) {
+            throw new SyntaxError('The variable specification "'.$specification.'" is invalid.');
+        }
+
+        $properties = ['name' => $parsed['name'], 'modifier' => $parsed['modifier'] ?? '', 'position' => $parsed['position'] ?? ''];
+
+        if ('' !== $properties['position']) {
+            $properties['position'] = (int) $properties['position'];
+            $properties['modifier'] = ':';
+        }
+
+        if ('' === $properties['position']) {
+            $properties['position'] = 0;
+        }
+
+        if (self::MODIFIER_POSITION_MAX_POSITION <= $properties['position']) {
+            throw new SyntaxError('The variable specification "'.$specification.'" is invalid the position modifier must be lower than 10000.');
+        }
+
+        return new self($properties['name'], $properties['modifier'], $properties['position']);
+    }
+
+    public function toString(): string
+    {
+        return $this->name.$this->modifier.match (true) {
+            0 < $this->position => $this->position,
+            default => '',
+        };
+    }
+}