Subversion-Projekte lars-tiefland.laravel_shop

<?php

declare(strict_types=1);

/*

 * This file is part of the league/commonmark package.

 *

 * (c) Colin O'Dell <colinodell@gmail.com>

 *

 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)

 *  - (c) John MacFarlane

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace League\CommonMark\Parser;

use League\CommonMark\Environment\EnvironmentInterface;

use League\CommonMark\Node\Block\AbstractBlock;

use League\CommonMark\Node\Inline\AdjacentTextMerger;

use League\CommonMark\Node\Inline\Text;

use League\CommonMark\Parser\Inline\InlineParserInterface;

use League\CommonMark\Reference\ReferenceMapInterface;

/**

 * @internal

 */

final class InlineParserEngine implements InlineParserEngineInterface

{

    /** @psalm-readonly */

    private EnvironmentInterface $environment;

    /** @psalm-readonly */

    private ReferenceMapInterface $referenceMap;

    /**

     * @var array<int, InlineParserInterface|string|bool>

     * @psalm-var list<array{0: InlineParserInterface, 1: string, 2: bool}>

     * @phpstan-var array<int, array{0: InlineParserInterface, 1: string, 2: bool}>

     */

    private array $parsers = [];

    public function __construct(EnvironmentInterface $environment, ReferenceMapInterface $referenceMap)

    {

        $this->environment  = $environment;

        $this->referenceMap = $referenceMap;

        foreach ($environment->getInlineParsers() as $parser) {

            \assert($parser instanceof InlineParserInterface);

            $regex = $parser->getMatchDefinition()->getRegex();

            $this->parsers[] = [$parser, $regex, \strlen($regex) !== \mb_strlen($regex, 'UTF-8')];

        }

    }

    public function parse(string $contents, AbstractBlock $block): void

    {

        $contents = \trim($contents);

        $cursor   = new Cursor($contents);

        $inlineParserContext = new InlineParserContext($cursor, $block, $this->referenceMap);

        // Have all parsers look at the line to determine what they might want to parse and what positions they exist at

        foreach ($this->matchParsers($contents) as $matchPosition => $parsers) {

            $currentPosition = $cursor->getPosition();

            // We've already gone past this point

            if ($currentPosition > $matchPosition) {

                continue;

            }

            // We've skipped over some uninteresting text that should be added as a plain text node

            if ($currentPosition < $matchPosition) {

                $cursor->advanceBy($matchPosition - $currentPosition);

                $this->addPlainText($cursor->getPreviousText(), $block);

            }

            // We're now at a potential start - see which of the current parsers can handle it

            $parsed = false;

            foreach ($parsers as [$parser, $matches]) {

                \assert($parser instanceof InlineParserInterface);

                if ($parser->parse($inlineParserContext->withMatches($matches))) {

                    // A parser has successfully handled the text at the given position; don't consider any others at this position

                    $parsed = true;

                    break;

                }

            }

            if ($parsed) {

                continue;

            }

            // Despite potentially being interested, nothing actually parsed text here, so add the current character and continue onwards

            $this->addPlainText((string) $cursor->getCurrentCharacter(), $block);

            $cursor->advance();

        }

        // Add any remaining text that wasn't parsed

        if (! $cursor->isAtEnd()) {

            $this->addPlainText($cursor->getRemainder(), $block);

        }

        // Process any delimiters that were found

        $delimiterStack = $inlineParserContext->getDelimiterStack();

        $delimiterStack->processDelimiters(null, $this->environment->getDelimiterProcessors());

        $delimiterStack->removeAll();

        // Combine adjacent text notes into one

        AdjacentTextMerger::mergeChildNodes($block);

    }

    private function addPlainText(string $text, AbstractBlock $container): void

    {

        $lastInline = $container->lastChild();

        if ($lastInline instanceof Text && ! $lastInline->data->has('delim')) {

            $lastInline->append($text);

        } else {

            $container->appendChild(new Text($text));

        }

    }

    /**

     * Given the current line, ask all the parsers which parts of the text they would be interested in parsing.

     *

     * The resulting array provides a list of character positions, which parsers are interested in trying to parse

     * the text at those points, and (for convenience/optimization) what the matching text happened to be.

     *

     * @return array<array<int, InlineParserInterface|string>>

     *

     * @psalm-return array<int, list<array{0: InlineParserInterface, 1: non-empty-array<string>}>>

     *

     * @phpstan-return array<int, array<int, array{0: InlineParserInterface, 1: non-empty-array<string>}>>

     */

    private function matchParsers(string $contents): array

    {

        $contents    = \trim($contents);

        $isMultibyte = ! \mb_check_encoding($contents, 'ASCII');

        $ret = [];

        foreach ($this->parsers as [$parser, $regex, $isRegexMultibyte]) {

            if ($isMultibyte || $isRegexMultibyte) {

                $regex .= 'u';

            }

            // See if the parser's InlineParserMatch regex matched against any part of the string

            if (! \preg_match_all($regex, $contents, $matches, \PREG_OFFSET_CAPTURE | \PREG_SET_ORDER)) {

                continue;

            }

            // For each part that matched...

            foreach ($matches as $match) {

                if ($isMultibyte) {

                    // PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying

                    $offset = \mb_strlen(\substr($contents, 0, $match[0][1]), 'UTF-8');

                } else {

                    $offset = \intval($match[0][1]);

                }

                // Remove the offsets, keeping only the matched text

                $m = \array_column($match, 0);

                if ($m === []) {

                    continue;

                }

                // Add this match to the list of character positions to stop at

                $ret[$offset][] = [$parser, $m];

            }

        }

        // Sort matches by position so we visit them in order

        \ksort($ret);

        return $ret;

    }

}