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