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<?php
/*
* 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 (http://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\Extension\SmartPunct;
use League\CommonMark\Delimiter\Delimiter;
use League\CommonMark\Inline\Parser\InlineParserInterface;
use League\CommonMark\InlineParserContext;
use League\CommonMark\Util\RegexHelper;
final class QuoteParser implements InlineParserInterface
{
public const DOUBLE_QUOTES = [Quote::DOUBLE_QUOTE, Quote::DOUBLE_QUOTE_OPENER, Quote::DOUBLE_QUOTE_CLOSER];
public const SINGLE_QUOTES = [Quote::SINGLE_QUOTE, Quote::SINGLE_QUOTE_OPENER, Quote::SINGLE_QUOTE_CLOSER];
/**
* @return string[]
*/
public function getCharacters(): array
{
return array_merge(self::DOUBLE_QUOTES, self::SINGLE_QUOTES);
}
/**
* Normalizes any quote characters found and manually adds them to the delimiter stack
*/
public function parse(InlineParserContext $inlineContext): bool
{
$cursor = $inlineContext->getCursor();
$normalizedCharacter = $this->getNormalizedQuoteCharacter($cursor->getCharacter());
$charBefore = $cursor->peek(-1);
if ($charBefore === null) {
$charBefore = "\n";
}
$cursor->advance();
$charAfter = $cursor->getCharacter();
if ($charAfter === null) {
$charAfter = "\n";
}
[$leftFlanking, $rightFlanking] = $this->determineFlanking($charBefore, $charAfter);
$canOpen = $leftFlanking && !$rightFlanking;
$canClose = $rightFlanking;
$node = new Quote($normalizedCharacter, ['delim' => true]);
$inlineContext->getContainer()->appendChild($node);
// Add entry to stack to this opener
$inlineContext->getDelimiterStack()->push(new Delimiter($normalizedCharacter, 1, $node, $canOpen, $canClose));
return true;
}
private function getNormalizedQuoteCharacter(string $character): string
{
if (in_array($character, self::DOUBLE_QUOTES)) {
return Quote::DOUBLE_QUOTE;
} elseif (in_array($character, self::SINGLE_QUOTES)) {
return Quote::SINGLE_QUOTE;
}
return $character;
}
/**
* @param string $charBefore
* @param string $charAfter
*
* @return bool[]
*/
private function determineFlanking(string $charBefore, string $charAfter)
{
$afterIsWhitespace = preg_match('/\pZ|\s/u', $charAfter);
$afterIsPunctuation = preg_match(RegexHelper::REGEX_PUNCTUATION, $charAfter);
$beforeIsWhitespace = preg_match('/\pZ|\s/u', $charBefore);
$beforeIsPunctuation = preg_match(RegexHelper::REGEX_PUNCTUATION, $charBefore);
$leftFlanking = !$afterIsWhitespace &&
!($afterIsPunctuation &&
!$beforeIsWhitespace &&
!$beforeIsPunctuation);
$rightFlanking = !$beforeIsWhitespace &&
!($beforeIsPunctuation &&
!$afterIsWhitespace &&
!$afterIsPunctuation);
return [$leftFlanking, $rightFlanking];
}
}
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