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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Extension\CommonMark\Parser\Block; |
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use League\CommonMark\Parser\Block\BlockStart; |
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use League\CommonMark\Parser\Block\BlockStartParserInterface; |
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use League\CommonMark\Parser\Cursor; |
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use League\CommonMark\Parser\MarkdownParserStateInterface; |
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use League\CommonMark\Util\RegexHelper; |
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class HeadingStartParser implements BlockStartParserInterface |
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{ |
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2289 |
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public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart |
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{ |
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2289 |
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if ($cursor->isIndented()) { |
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195 |
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return BlockStart::none(); |
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} |
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2190 |
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$cursor->advanceToNextNonSpaceOrTab(); |
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2190 |
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if ($atxHeading = self::getAtxHeader($cursor)) { |
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171 |
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return BlockStart::of($atxHeading)->at($cursor); |
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} |
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2049 |
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$setextHeadingLevel = self::getSetextHeadingLevel($cursor); |
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2049 |
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if ($setextHeadingLevel > 0) { |
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$content = $parserState->getParagraphContent(); |
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if ($content !== null) { |
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$cursor->advanceToEnd(); |
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return BlockStart::of(new HeadingParser($setextHeadingLevel, $content)) |
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->at($cursor) |
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->replaceActiveBlockParser(); |
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} |
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} |
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return BlockStart::none(); |
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} |
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2190 |
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private static function getAtxHeader(Cursor $cursor): ?HeadingParser |
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{ |
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2190 |
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$match = RegexHelper::matchFirst('/^#{1,6}(?:[ \t]+|$)/', $cursor->getLine(), $cursor->getNextNonSpacePosition()); |
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2190 |
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if (! $match) { |
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return null; |
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} |
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171 |
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$cursor->advanceToNextNonSpaceOrTab(); |
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171 |
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$cursor->advanceBy(\strlen($match[0])); |
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171 |
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$level = \strlen(\trim($match[0])); |
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171 |
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$str = $cursor->getRemainder(); |
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171 |
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$str = \preg_replace('/^[ \t]*#+[ \t]*$/', '', $str); |
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\assert(\is_string($str)); |
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171 |
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$str = \preg_replace('/[ \t]+#+[ \t]*$/', '', $str); |
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\assert(\is_string($str)); |
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return new HeadingParser($level, $str); |
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} |
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2049 |
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private static function getSetextHeadingLevel(Cursor $cursor): int |
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{ |
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2049 |
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$match = RegexHelper::matchFirst('/^(?:=+|-+)[ \t]*$/', $cursor->getLine(), $cursor->getNextNonSpacePosition()); |
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2049 |
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if ($match === null) { |
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return 0; |
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} |
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return $match[0][0] === '=' ? 1 : 2; |
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} |
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} |
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thephpleague /
commonmark
