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paoloar77
237
vendor/league/commonmark/src/DocParser.php
vendored
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237
vendor/league/commonmark/src/DocParser.php
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<?php
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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 <colinodell@gmail.com>
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*
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* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
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* - (c) John MacFarlane
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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;
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use League\CommonMark\Block\Element\AbstractBlock;
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use League\CommonMark\Block\Element\AbstractStringContainerBlock;
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use League\CommonMark\Block\Element\Document;
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use League\CommonMark\Block\Element\Paragraph;
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use League\CommonMark\Block\Element\StringContainerInterface;
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use League\CommonMark\Event\DocumentParsedEvent;
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use League\CommonMark\Event\DocumentPreParsedEvent;
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use League\CommonMark\Input\MarkdownInput;
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final class DocParser implements DocParserInterface
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{
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/**
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* @var EnvironmentInterface
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*/
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private $environment;
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/**
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* @var InlineParserEngine
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*/
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private $inlineParserEngine;
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/**
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* @var int|float
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*/
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private $maxNestingLevel;
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/**
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* @param EnvironmentInterface $environment
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*/
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public function __construct(EnvironmentInterface $environment)
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{
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$this->environment = $environment;
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$this->inlineParserEngine = new InlineParserEngine($environment);
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$this->maxNestingLevel = $environment->getConfig('max_nesting_level', \PHP_INT_MAX);
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if (\is_float($this->maxNestingLevel)) {
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if ($this->maxNestingLevel === \INF) {
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@\trigger_error('Using the "INF" constant for the "max_nesting_level" configuration option is deprecated in league/commonmark 1.6 and will not be allowed in 2.0; use "PHP_INT_MAX" instead', \E_USER_DEPRECATED);
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} else {
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@\trigger_error('Using a float for the "max_nesting_level" configuration option is deprecated in league/commonmark 1.6 and will not be allowed in 2.0', \E_USER_DEPRECATED);
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}
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}
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}
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/**
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* @param string $input
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*
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* @throws \RuntimeException
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*
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* @return Document
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*/
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public function parse(string $input): Document
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{
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$document = new Document();
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$preParsedEvent = new DocumentPreParsedEvent($document, new MarkdownInput($input));
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$this->environment->dispatch($preParsedEvent);
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$markdown = $preParsedEvent->getMarkdown();
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$context = new Context($document, $this->environment);
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foreach ($markdown->getLines() as $line) {
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$context->setNextLine($line);
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$this->incorporateLine($context);
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}
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$lineCount = $markdown->getLineCount();
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while ($tip = $context->getTip()) {
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$tip->finalize($context, $lineCount);
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}
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$this->processInlines($context);
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$this->environment->dispatch(new DocumentParsedEvent($document));
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return $document;
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}
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private function incorporateLine(ContextInterface $context): void
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{
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$context->getBlockCloser()->resetTip();
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$context->setBlocksParsed(false);
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$cursor = new Cursor($context->getLine());
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$this->resetContainer($context, $cursor);
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$context->getBlockCloser()->setLastMatchedContainer($context->getContainer());
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$this->parseBlocks($context, $cursor);
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// What remains at the offset is a text line. Add the text to the appropriate container.
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// First check for a lazy paragraph continuation:
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if ($this->handleLazyParagraphContinuation($context, $cursor)) {
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return;
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}
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// not a lazy continuation
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// finalize any blocks not matched
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$context->getBlockCloser()->closeUnmatchedBlocks();
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// Determine whether the last line is blank, updating parents as needed
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$this->setAndPropagateLastLineBlank($context, $cursor);
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// Handle any remaining cursor contents
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if ($context->getContainer() instanceof StringContainerInterface) {
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$context->getContainer()->handleRemainingContents($context, $cursor);
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} elseif (!$cursor->isBlank()) {
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// Create paragraph container for line
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$p = new Paragraph();
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$context->addBlock($p);
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$cursor->advanceToNextNonSpaceOrTab();
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$p->addLine($cursor->getRemainder());
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}
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}
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private function processInlines(ContextInterface $context): void
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{
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$walker = $context->getDocument()->walker();
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while ($event = $walker->next()) {
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if (!$event->isEntering()) {
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continue;
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}
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$node = $event->getNode();
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if ($node instanceof AbstractStringContainerBlock) {
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$this->inlineParserEngine->parse($node, $context->getDocument()->getReferenceMap());
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}
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}
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}
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/**
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* Sets the container to the last open child (or its parent)
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*
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* @param ContextInterface $context
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* @param Cursor $cursor
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*/
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private function resetContainer(ContextInterface $context, Cursor $cursor): void
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{
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$container = $context->getDocument();
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while ($lastChild = $container->lastChild()) {
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if (!($lastChild instanceof AbstractBlock)) {
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break;
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}
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if (!$lastChild->isOpen()) {
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break;
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}
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$container = $lastChild;
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if (!$container->matchesNextLine($cursor)) {
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$container = $container->parent(); // back up to the last matching block
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break;
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}
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}
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$context->setContainer($container);
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}
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/**
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* Parse blocks
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*
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* @param ContextInterface $context
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* @param Cursor $cursor
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*/
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private function parseBlocks(ContextInterface $context, Cursor $cursor): void
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{
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while (!$context->getContainer()->isCode() && !$context->getBlocksParsed()) {
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$parsed = false;
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foreach ($this->environment->getBlockParsers() as $parser) {
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if ($parser->parse($context, $cursor)) {
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$parsed = true;
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break;
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}
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}
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if (!$parsed || $context->getContainer() instanceof StringContainerInterface || (($tip = $context->getTip()) && $tip->getDepth() >= $this->maxNestingLevel)) {
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$context->setBlocksParsed(true);
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break;
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}
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}
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}
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private function handleLazyParagraphContinuation(ContextInterface $context, Cursor $cursor): bool
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{
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$tip = $context->getTip();
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if ($tip instanceof Paragraph &&
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!$context->getBlockCloser()->areAllClosed() &&
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!$cursor->isBlank() &&
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\count($tip->getStrings()) > 0) {
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// lazy paragraph continuation
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$tip->addLine($cursor->getRemainder());
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return true;
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}
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return false;
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}
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private function setAndPropagateLastLineBlank(ContextInterface $context, Cursor $cursor): void
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{
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$container = $context->getContainer();
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if ($cursor->isBlank() && $lastChild = $container->lastChild()) {
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if ($lastChild instanceof AbstractBlock) {
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$lastChild->setLastLineBlank(true);
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}
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}
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$lastLineBlank = $container->shouldLastLineBeBlank($cursor, $context->getLineNumber());
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// Propagate lastLineBlank up through parents:
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while ($container instanceof AbstractBlock && $container->endsWithBlankLine() !== $lastLineBlank) {
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$container->setLastLineBlank($lastLineBlank);
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$container = $container->parent();
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}
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}
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}
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