<?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:----MzgxMTk4MTA3MjI2ODc4NiA1Mjk1MzA0NTE0OTAwMzk2IDU0MDgxNzg0NTYzNDI1MjA=