Subversion-Projekte lars-tiefland.laravel_shop

<?php

declare(strict_types=1);

namespace League\CommonMark\Delimiter;

use League\CommonMark\Delimiter\Processor\DelimiterProcessorCollection;

use League\CommonMark\Delimiter\Processor\DelimiterProcessorInterface;

use League\CommonMark\Node\Inline\Text;

use League\CommonMark\Parser\Inline\InlineParserInterface;

use League\CommonMark\Parser\Inline\InlineParserMatch;

use League\CommonMark\Parser\InlineParserContext;

use League\CommonMark\Util\RegexHelper;

/**

 * Delimiter parsing is implemented as an Inline Parser with the lowest-possible priority

 *

 * @internal

 */

final class DelimiterParser implements InlineParserInterface

{

    private DelimiterProcessorCollection $collection;

    public function __construct(DelimiterProcessorCollection $collection)

    {

        $this->collection = $collection;

    }

    public function getMatchDefinition(): InlineParserMatch

    {

        return InlineParserMatch::oneOf(...$this->collection->getDelimiterCharacters());

    }

    public function parse(InlineParserContext $inlineContext): bool

    {

        $character = $inlineContext->getFullMatch();

        $numDelims = 0;

        $cursor    = $inlineContext->getCursor();

        $processor = $this->collection->getDelimiterProcessor($character);

        if ($processor === null) {

            throw new \LogicException('Delimiter processor should never be null here');

        }

        $charBefore = $cursor->peek(-1);

        if ($charBefore === null) {

            $charBefore = "\n";

        }

        while ($cursor->peek($numDelims) === $character) {

            ++$numDelims;

        }

        if ($numDelims < $processor->getMinLength()) {

            return false;

        }

        $cursor->advanceBy($numDelims);

        $charAfter = $cursor->getCurrentCharacter();

        if ($charAfter === null) {

            $charAfter = "\n";

        }

        [$canOpen, $canClose] = self::determineCanOpenOrClose($charBefore, $charAfter, $character, $processor);

        $node = new Text(\str_repeat($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;

    }

    /**

     * @return bool[]

     */

    private static function determineCanOpenOrClose(string $charBefore, string $charAfter, string $character, DelimiterProcessorInterface $delimiterProcessor): array

    {

        $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];

    }

}