<?php declare(strict_types = 1);

namespace PHPStan\PhpDocParser\Parser;

use PHPStan\PhpDocParser\Lexer\Lexer;
use function array_pop;
use function assert;
use function count;
use function in_array;
use function strlen;

class TokenIterator
{

	/** @var mixed[][] */
	private $tokens;

	/** @var int */
	private $index;

	/** @var int[] */
	private $savePoints = [];

	public function __construct(array $tokens, int $index = 0)
	{
		$this->tokens = $tokens;
		$this->index = $index;

		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== Lexer::TOKEN_HORIZONTAL_WS) {
			return;
		}

		$this->index++;
	}


	public function currentTokenValue(): string
	{
		return $this->tokens[$this->index][Lexer::VALUE_OFFSET];
	}


	public function currentTokenType(): int
	{
		return $this->tokens[$this->index][Lexer::TYPE_OFFSET];
	}


	public function currentTokenOffset(): int
	{
		$offset = 0;
		for ($i = 0; $i < $this->index; $i++) {
			$offset += strlen($this->tokens[$i][Lexer::VALUE_OFFSET]);
		}

		return $offset;
	}


	public function isCurrentTokenValue(string $tokenValue): bool
	{
		return $this->tokens[$this->index][Lexer::VALUE_OFFSET] === $tokenValue;
	}


	public function isCurrentTokenType(int ...$tokenType): bool
	{
		return in_array($this->tokens[$this->index][Lexer::TYPE_OFFSET], $tokenType, true);
	}


	public function isPrecededByHorizontalWhitespace(): bool
	{
		return ($this->tokens[$this->index - 1][Lexer::TYPE_OFFSET] ?? -1) === Lexer::TOKEN_HORIZONTAL_WS;
	}


	/**
	 * @throws ParserException
	 */
	public function consumeTokenType(int $tokenType): void
	{
		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType) {
			$this->throwError($tokenType);
		}

		$this->index++;

		if (($this->tokens[$this->index][Lexer::TYPE_OFFSET] ?? -1) !== Lexer::TOKEN_HORIZONTAL_WS) {
			return;
		}

		$this->index++;
	}


	/**
	 * @throws ParserException
	 */
	public function consumeTokenValue(int $tokenType, string $tokenValue): void
	{
		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType || $this->tokens[$this->index][Lexer::VALUE_OFFSET] !== $tokenValue) {
			$this->throwError($tokenType, $tokenValue);
		}

		$this->index++;

		if (($this->tokens[$this->index][Lexer::TYPE_OFFSET] ?? -1) !== Lexer::TOKEN_HORIZONTAL_WS) {
			return;
		}

		$this->index++;
	}


	/** @phpstan-impure */
	public function tryConsumeTokenValue(string $tokenValue): bool
	{
		if ($this->tokens[$this->index][Lexer::VALUE_OFFSET] !== $tokenValue) {
			return false;
		}

		$this->index++;

		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] === Lexer::TOKEN_HORIZONTAL_WS) {
			$this->index++;
		}

		return true;
	}


	/** @phpstan-impure */
	public function tryConsumeTokenType(int $tokenType): bool
	{
		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType) {
			return false;
		}

		$this->index++;

		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] === Lexer::TOKEN_HORIZONTAL_WS) {
			$this->index++;
		}

		return true;
	}


	public function getSkippedHorizontalWhiteSpaceIfAny(): string
	{
		if ($this->index > 0 && $this->tokens[$this->index - 1][Lexer::TYPE_OFFSET] === Lexer::TOKEN_HORIZONTAL_WS) {
			return $this->tokens[$this->index - 1][Lexer::VALUE_OFFSET];
		}

		return '';
	}


	/** @phpstan-impure */
	public function joinUntil(int ...$tokenType): string
	{
		$s = '';
		while (!in_array($this->tokens[$this->index][Lexer::TYPE_OFFSET], $tokenType, true)) {
			$s .= $this->tokens[$this->index++][Lexer::VALUE_OFFSET];
		}
		return $s;
	}


	public function next(): void
	{
		$this->index++;

		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== Lexer::TOKEN_HORIZONTAL_WS) {
			return;
		}

		$this->index++;
	}

	/** @phpstan-impure */
	public function forwardToTheEnd(): void
	{
		$lastToken = count($this->tokens) - 1;
		$this->index = $lastToken;
	}


	public function pushSavePoint(): void
	{
		$this->savePoints[] = $this->index;
	}


	public function dropSavePoint(): void
	{
		array_pop($this->savePoints);
	}


	public function rollback(): void
	{
		$index = array_pop($this->savePoints);
		assert($index !== null);
		$this->index = $index;
	}


	/**
	 * @throws ParserException
	 */
	private function throwError(int $expectedTokenType, ?string $expectedTokenValue = null): void
	{
		throw new ParserException(
			$this->currentTokenValue(),
			$this->currentTokenType(),
			$this->currentTokenOffset(),
			$expectedTokenType,
			$expectedTokenValue
		);
	}

}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjQ5NjIyOTM5ODA1MzcxNSA5NDg5OTI5Nzg0MzkyOTYyIDM2NzE4NjgwNzAyMzc3OTM=