<?php

namespace League\CommonMark\Parser\Block;

use League\CommonMark\Parser\Cursor;
use League\CommonMark\Parser\CursorState;

/**
 * Result object for starting parsing of a block; see static methods for constructors
 */
final class BlockStart
{
    /**
     * @var BlockContinueParserInterface[]
     *
     * @psalm-readonly
     */
    private array $blockParsers;

    /** @psalm-readonly-allow-private-mutation */
    private ?CursorState $cursorState = null;

    /** @psalm-readonly-allow-private-mutation */
    private bool $replaceActiveBlockParser = false;
    private bool $isAborting = false;

    private function __construct(BlockContinueParserInterface ...$blockParsers)
    {
        $this->blockParsers = $blockParsers;
    }

    /**
     * @return BlockContinueParserInterface[]
     */
    public function getBlockParsers(): iterable
    {
        return $this->blockParsers;
    }

    public function getCursorState(): ?CursorState
    {
        return $this->cursorState;
    }

    public function isReplaceActiveBlockParser(): bool
    {
        return $this->replaceActiveBlockParser;
    }

    /**
     * @internal
     */
    public function isAborting(): bool
    {
        return $this->isAborting;
    }

    /**
     * Signal that we want to parse at the given cursor position
     *
     * @return $this
     */
    public function at(Cursor $cursor): self
    {
        $this->cursorState = $cursor->saveState();

        return $this;
    }

    /**
     * Signal that we want to replace the active block parser with this one
     *
     * @return $this
     */
    public function replaceActiveBlockParser(): self
    {
        $this->replaceActiveBlockParser = true;

        return $this;
    }

    /**
     * Signal that we cannot parse whatever is here
     *
     * @return null
     */
    public static function none(): ?self
    {
        return null;
    }

    /**
     * Signal that we'd like to register the given parser(s) so they can parse the current block
     */
    public static function of(BlockContinueParserInterface ...$blockParsers): self
    {
        return new self(...$blockParsers);
    }

    /**
     * Signal that the block parsing process should be aborted (no other block starts should be checked)
     *
     * @internal
     */
    public static function abort(): self
    {
        $ret             = new self();
        $ret->isAborting = true;

        return $ret;
    }
}
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