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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
* (c) 2015 Martin Hasoň <martin.hason@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace League\CommonMark\Extension\Attributes\Event;
use League\CommonMark\Block\Element\AbstractBlock;
use League\CommonMark\Block\Element\FencedCode;
use League\CommonMark\Block\Element\ListBlock;
use League\CommonMark\Block\Element\ListItem;
use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Extension\Attributes\Node\Attributes;
use League\CommonMark\Extension\Attributes\Node\AttributesInline;
use League\CommonMark\Extension\Attributes\Util\AttributesHelper;
use League\CommonMark\Inline\Element\AbstractInline;
use League\CommonMark\Node\Node;
final class AttributesListener
{
private const DIRECTION_PREFIX = 'prefix';
private const DIRECTION_SUFFIX = 'suffix';
public function processDocument(DocumentParsedEvent $event): void
{
$walker = $event->getDocument()->walker();
while ($event = $walker->next()) {
$node = $event->getNode();
if (!$node instanceof AttributesInline && ($event->isEntering() || !$node instanceof Attributes)) {
continue;
}
[$target, $direction] = self::findTargetAndDirection($node);
if ($target instanceof AbstractBlock || $target instanceof AbstractInline) {
$parent = $target->parent();
if ($parent instanceof ListItem && $parent->parent() instanceof ListBlock && $parent->parent()->isTight()) {
$target = $parent;
}
if ($direction === self::DIRECTION_SUFFIX) {
$attributes = AttributesHelper::mergeAttributes($target, $node->getAttributes());
} else {
$attributes = AttributesHelper::mergeAttributes($node->getAttributes(), $target);
}
$target->data['attributes'] = $attributes;
}
if ($node instanceof AbstractBlock && $node->endsWithBlankLine() && $node->next() && $node->previous()) {
$previous = $node->previous();
if ($previous instanceof AbstractBlock) {
$previous->setLastLineBlank(true);
}
}
$node->detach();
}
}
/**
* @param Node $node
*
* @return array<Node|string|null>
*/
private static function findTargetAndDirection(Node $node): array
{
$target = null;
$direction = null;
$previous = $next = $node;
while (true) {
$previous = self::getPrevious($previous);
$next = self::getNext($next);
if ($previous === null && $next === null) {
if (!$node->parent() instanceof FencedCode) {
$target = $node->parent();
$direction = self::DIRECTION_SUFFIX;
}
break;
}
if ($node instanceof AttributesInline && ($previous === null || ($previous instanceof AbstractInline && $node->isBlock()))) {
continue;
}
if ($previous !== null && !self::isAttributesNode($previous)) {
$target = $previous;
$direction = self::DIRECTION_SUFFIX;
break;
}
if ($next !== null && !self::isAttributesNode($next)) {
$target = $next;
$direction = self::DIRECTION_PREFIX;
break;
}
}
return [$target, $direction];
}
private static function getPrevious(?Node $node = null): ?Node
{
$previous = $node instanceof Node ? $node->previous() : null;
if ($previous instanceof AbstractBlock && $previous->endsWithBlankLine()) {
$previous = null;
}
return $previous;
}
private static function getNext(?Node $node = null): ?Node
{
$next = $node instanceof Node ? $node->next() : null;
if ($node instanceof AbstractBlock && $node->endsWithBlankLine()) {
$next = null;
}
return $next;
}
private static function isAttributesNode(Node $node): bool
{
return $node instanceof Attributes || $node instanceof AttributesInline;
}
}