<?php

namespace League\CommonMark\Parser\Block;

use League\CommonMark\Parser\Cursor;
use League\CommonMark\Parser\MarkdownParserStateInterface;
use League\CommonMark\Util\RegexHelper;

/**
 * @internal
 *
 * This "parser" is actually a performance optimization.
 *
 * Most lines in a typical Markdown document probably won't match a block start. This is especially true for lines starting
 * with letters - nothing in the core CommonMark spec or our supported extensions will match those lines as blocks. Therefore,
 * if we can identify those lines and skip block start parsing, we can optimize performance by ~10%.
 *
 * Previously this optimization was hard-coded in the MarkdownParser but did not allow users to override this behavior.
 * By implementing this optimization as a block parser instead, users wanting custom blocks starting with letters
 * can instead register their block parser with a higher priority to ensure their parser is always called first.
 */
final class SkipLinesStartingWithLettersParser implements BlockStartParserInterface
{
    public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
    {
        if (! $cursor->isIndented() && RegexHelper::isLetter($cursor->getNextNonSpaceCharacter())) {
            $cursor->advanceToNextNonSpaceOrTab();

            return BlockStart::abort();
        }

        return BlockStart::none();
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----ODI1MDAxNjU0MzA4NDYzIDM4NzU2ODMxNzE3MzU4MDMgOTE0MTk2MzA5Nzc5MjA3Mg==