initial commit; version 22.5.12042

libs/Doctrine/SqlFormatter/Cursor.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\SqlFormatter;
+
+final class Cursor
+{
+    /** @var int */
+    private $position = -1;
+
+    /** @var Token[] */
+    private $tokens;
+
+    /**
+     * @param Token[] $tokens
+     */
+    public function __construct(array $tokens)
+    {
+        $this->tokens = $tokens;
+    }
+
+    public function next(int $exceptTokenType = null)
+    {
+        while ($token = $this->tokens[++$this->position] ?? null) {
+            if ($exceptTokenType !== null && $token->isOfType($exceptTokenType)) {
+                continue;
+            }
+
+            return $token;
+        }
+
+        return null;
+    }
+
+    public function previous(int $exceptTokenType = null)
+    {
+        while ($token = $this->tokens[--$this->position] ?? null) {
+            if ($exceptTokenType !== null && $token->isOfType($exceptTokenType)) {
+                continue;
+            }
+
+            return $token;
+        }
+
+        return null;
+    }
+
+    public function subCursor() : self
+    {
+        $cursor           = new self($this->tokens);
+        $cursor->position = $this->position;
+
+        return $cursor;
+    }
+}