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use League\CommonMark\Block\Element\AbstractStringContainerBlock; use League\CommonMark\Delimiter\Delimiter; use League\CommonMark\Delimiter\Processor\DelimiterProcessorInterface; use League\CommonMark\Inline\AdjacentTextMerger; use League\CommonMark\Inline\Element\Text; use League\CommonMark\Node\Node; use League\CommonMark\Reference\ReferenceMapInterface; use League\CommonMark\Util\RegexHelper; /** * @internal */ final class InlineParserEngine { /** @var EnvironmentInterface */ protected $environment; public function __construct(EnvironmentInterface $environment) { $this->environment = $environment; } /** * @param AbstractStringContainerBlock $container * @param ReferenceMapInterface $referenceMap * * @return void */ public function parse(AbstractStringContainerBlock $container, ReferenceMapInterface $referenceMap) { $inlineParserContext = new InlineParserContext($container, $referenceMap); $cursor = $inlineParserContext->getCursor(); while (($character = $cursor->getCharacter()) !== null) { if (!$this->parseCharacter($character, $inlineParserContext)) { $this->addPlainText($character, $container, $inlineParserContext); } } $this->processInlines($inlineParserContext); AdjacentTextMerger::mergeChildNodes($container); } /** * @param string $character * @param InlineParserContext $inlineParserContext * * @return bool Whether we successfully parsed a character at that position */ private function parseCharacter(string $character, InlineParserContext $inlineParserContext): bool { foreach ($this->environment->getInlineParsersForCharacter($character) as $parser) { if ($parser->parse($inlineParserContext)) { return true; } } if ($delimiterProcessor = $this->environment->getDelimiterProcessors()->getDelimiterProcessor($character)) { return $this->parseDelimiters($delimiterProcessor, $inlineParserContext); } return false; } private function parseDelimiters(DelimiterProcessorInterface $delimiterProcessor, InlineParserContext $inlineContext): bool { $cursor = $inlineContext->getCursor(); $character = $cursor->getCharacter(); $numDelims = 0; $charBefore = $cursor->peek(-1); if ($charBefore === null) { $charBefore = "\n"; } while ($cursor->peek($numDelims) === $character) { ++$numDelims; } if ($numDelims < $delimiterProcessor->getMinLength()) { return false; } $cursor->advanceBy($numDelims); $charAfter = $cursor->getCharacter(); if ($charAfter === null) { $charAfter = "\n"; } list($canOpen, $canClose) = self::determineCanOpenOrClose($charBefore, $charAfter, $character, $delimiterProcessor); $node = new Text(\str_repeat($character, $numDelims), [ 'delim' => true, ]); $inlineContext->getContainer()->appendChild($node); // Add entry to stack to this opener if ($canOpen || $canClose) { $delimiter = new Delimiter($character, $numDelims, $node, $canOpen, $canClose); $inlineContext->getDelimiterStack()->push($delimiter); } return true; } /** * @param InlineParserContext $inlineParserContext * * @return void */ private function processInlines(InlineParserContext $inlineParserContext) { $delimiterStack = $inlineParserContext->getDelimiterStack(); $delimiterStack->processDelimiters(null, $this->environment->getDelimiterProcessors()); // Remove all delimiters $delimiterStack->removeAll(); } /** * @param string $character * @param Node $container * @param InlineParserContext $inlineParserContext * * @return void */ private function addPlainText(string $character, Node $container, InlineParserContext $inlineParserContext) { // We reach here if none of the parsers can handle the input // Attempt to match multiple non-special characters at once $text = $inlineParserContext->getCursor()->match($this->environment->getInlineParserCharacterRegex()); // This might fail if we're currently at a special character which wasn't parsed; if so, just add that character if ($text === null) { $inlineParserContext->getCursor()->advanceBy(1); $text = $character; } $lastInline = $container->lastChild(); if ($lastInline instanceof Text && !isset($lastInline->data['delim'])) { $lastInline->append($text); } else { $container->appendChild(new Text($text)); } } /** * @param string $charBefore * @param string $charAfter * @param string $character * @param DelimiterProcessorInterface $delimiterProcessor * * @return bool[] */ private static function determineCanOpenOrClose(string $charBefore, string $charAfter, string $character, DelimiterProcessorInterface $delimiterProcessor) { $afterIsWhitespace = \preg_match(RegexHelper::REGEX_UNICODE_WHITESPACE_CHAR, $charAfter); $afterIsPunctuation = \preg_match(RegexHelper::REGEX_PUNCTUATION, $charAfter); $beforeIsWhitespace = \preg_match(RegexHelper::REGEX_UNICODE_WHITESPACE_CHAR, $charBefore); $beforeIsPunctuation = \preg_match(RegexHelper::REGEX_PUNCTUATION, $charBefore); $leftFlanking = !$afterIsWhitespace && (!$afterIsPunctuation || $beforeIsWhitespace || $beforeIsPunctuation); $rightFlanking = !$beforeIsWhitespace && (!$beforeIsPunctuation || $afterIsWhitespace || $afterIsPunctuation); if ($character === '_') { $canOpen = $leftFlanking && (!$rightFlanking || $beforeIsPunctuation); $canClose = $rightFlanking && (!$leftFlanking || $afterIsPunctuation); } else { $canOpen = $leftFlanking && $character === $delimiterProcessor->getOpeningCharacter(); $canClose = $rightFlanking && $character === $delimiterProcessor->getClosingCharacter(); } return [$canOpen, $canClose]; } }