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Edit File: TokenStream.php

<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Neon;

/** @internal */
final class TokenStream
{
	/** @var Token[] */
	private $tokens;

/** @var int */
	private $pos = 0;

public function __construct(array $tokens)
	{
		$this->tokens = $tokens;
	}

public function getPos(): int
	{
		return $this->pos;
	}

/** @return Token[] */
	public function getTokens(): array
	{
		return $this->tokens;
	}

public function isNext(...$types): bool
	{
		while (in_array($this->tokens[$this->pos]->type ?? null, [Token::Comment, Token::Whitespace], true)) {
			$this->pos++;
		}

return $types
			? in_array($this->tokens[$this->pos]->type ?? null, $types, true)
			: isset($this->tokens[$this->pos]);
	}

public function consume(...$types): ?Token
	{
		return $this->isNext(...$types)
			? $this->tokens[$this->pos++]
			: null;
	}

public function getIndentation(): string
	{
		return in_array($this->tokens[$this->pos - 2]->type ?? null, [Token::Newline, null], true)
			&& ($this->tokens[$this->pos - 1]->type ?? null) === Token::Whitespace
			? $this->tokens[$this->pos - 1]->value
			: '';
	}

/** @return never */
	public function error(?string $message = null, ?int $pos = null): void
	{
		$pos = $pos ?? $this->pos;
		$input = '';
		foreach ($this->tokens as $i => $token) {
			if ($i >= $pos) {
				break;
			}

$input .= $token->value;
		}

$line = substr_count($input, "\n") + 1;
		$col = strlen($input) - strrpos("\n" . $input, "\n") + 1;
		$token = $this->tokens[$pos] ?? null;
		$message = $message ?? 'Unexpected ' . ($token === null
			? 'end'
			: "'" . str_replace("\n", '<new line>', substr($this->tokens[$pos]->value, 0, 40)) . "'");
		throw new Exception("$message on line $line, column $col.");
	}
}