82 lines
2.3 KiB
PHP
82 lines
2.3 KiB
PHP
<?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\Block\Parser;
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use League\CommonMark\Block\Element\Heading;
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use League\CommonMark\Block\Element\Paragraph;
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use League\CommonMark\ContextInterface;
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use League\CommonMark\Cursor;
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use League\CommonMark\Reference\ReferenceParser;
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use League\CommonMark\Util\RegexHelper;
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final class SetExtHeadingParser implements BlockParserInterface
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{
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public function parse(ContextInterface $context, Cursor $cursor): bool
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{
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if ($cursor->isIndented()) {
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return false;
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}
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if (!($context->getContainer() instanceof Paragraph)) {
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return false;
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}
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$match = RegexHelper::matchAll('/^(?:=+|-+)[ \t]*$/', $cursor->getLine(), $cursor->getNextNonSpacePosition());
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if ($match === null) {
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return false;
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}
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$level = $match[0][0] === '=' ? 1 : 2;
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$strings = $context->getContainer()->getStrings();
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$strings = $this->resolveReferenceLinkDefinitions($strings, $context->getReferenceParser());
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if (empty($strings)) {
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return false;
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}
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$context->replaceContainerBlock(new Heading($level, $strings));
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return true;
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}
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/**
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* Resolve reference link definition
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*
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* @see https://github.com/commonmark/commonmark.js/commit/993bbe335931af847460effa99b2411eb643577d
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*
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* @param string[] $strings
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* @param ReferenceParser $referenceParser
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*
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* @return string[]
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*/
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private function resolveReferenceLinkDefinitions(array $strings, ReferenceParser $referenceParser): array
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{
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foreach ($strings as &$string) {
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$cursor = new Cursor($string);
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while ($cursor->getCharacter() === '[' && $referenceParser->parse($cursor)) {
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$string = $cursor->getRemainder();
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}
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if ($string !== '') {
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break;
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}
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}
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return \array_filter($strings, function ($s) {
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return $s !== '';
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});
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}
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}
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