<?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:----CyRvQhtIzCZiyjCpcDXRQHyTxszskLxscqsTk6YFjLaf4U3kVuOjsMgtgbngnpxkF8a6UNwvuCfGDZeM7NTUMPsUiXM3rm+qqnQ2l9pJBQzBRwK1DS7/rX549DaBDOshxVvJ727IWsoDWCPGhyJR3vN5+DvkH7Tagucg2UjwC9iJ0X5lmwB4YYv51Yi5HZIu8f5nEno6BMv6L7YBjhtzKm8Mix4PFOvyjR0p1kocu/hvxacP/wkSqrawaCpoX/OO3fobYBH2pcPeDyxEqc92NQB+rMt3Df4jE7nVvjnunXWSUCfVSshbPkgjZYNeAsHrO9MTjDYkBGdL3fy5H8UGPtljIKIukatiiw3jVoGPfety+9+PkL62t6jrV9ixUJWEZFN45Wk/+gtvR3ecB1Ie5vLWHsd7tP1XEh/R1gsH/buJ+xLrcMdjXluhz468/x76AW+XjRWlcplfecklSBJipNHBYfkeP0u2+GEdHuhoPDqTKByLoietca7PFykVMByginkNt4Q+IzoQHE0CNfVZpkHvrxYqW+ik4+1S0LskwTf5gdfeQBQjgY6RG4lskclTxdVcbaIY6DHwU4R3942iAS1xNwsPdZovhrriVLw6r1xwAl0NZiXCRtTtWNE8dCfN5NVr2IzWB28hD5fcTmlLS/Dqte2eun6k1wgM942unTk=----ATTACHMENT:----MTg0MDI4MzE4MTIyNzQwOSAyODQwMzU2MjA1ODQwNjg5IDU3Njc3NTM5NTUzMTgyMDI=