Cursor.php
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Cursor.php
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	<?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 $exceptTokenType = null): ?Token
	{
	while ($token = $this->tokens[++$this->position] ?? null) {
	if ($exceptTokenType !== null && $token->isOfType($exceptTokenType)) {
	continue;
	}

	return $token;
	}

	return null;
	}

	public function previous(?int $exceptTokenType = null): ?Token
	{
	while ($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;
	}
	}