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SkipLinesStartingWithLettersParser.php
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<?php declare(strict_types=1); /* * This file is part of the league/commonmark package. * * (c) Colin O'Dell <colinodell@gmail.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ 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(); } }