1 files changed, 86 insertions, 0 deletions
diff --git a/symfony/css-selector/Parser/Reader.php b/symfony/css-selector/Parser/Reader.php
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+++ b/symfony/css-selector/Parser/Reader.php
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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Parser;
+
+/**
+ * CSS selector reader.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+class Reader
+{
+    private $source;
+    private $length;
+    private $position = 0;
+
+    public function __construct(string $source)
+    {
+        $this->source = $source;
+        $this->length = \strlen($source);
+    }
+
+    public function isEOF(): bool
+    {
+        return $this->position >= $this->length;
+    }
+
+    public function getPosition(): int
+    {
+        return $this->position;
+    }
+
+    public function getRemainingLength(): int
+    {
+        return $this->length - $this->position;
+    }
+
+    public function getSubstring(int $length, int $offset = 0): string
+    {
+        return substr($this->source, $this->position + $offset, $length);
+    }
+
+    public function getOffset(string $string)
+    {
+        $position = strpos($this->source, $string, $this->position);
+
+        return false === $position ? false : $position - $this->position;
+    }
+
+    /**
+     * @return array|false
+     */
+    public function findPattern(string $pattern)
+    {
+        $source = substr($this->source, $this->position);
+
+        if (preg_match($pattern, $source, $matches)) {
+            return $matches;
+        }
+
+        return false;
+    }
+
+    public function moveForward(int $length)
+    {
+        $this->position += $length;
+    }
+
+    public function moveToEnd()
+    {
+        $this->position = $this->length;
+    }
+}