Viewing file:  AdjacentTextMerger.php (2.88 KB) -rw-r--r--
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<?php
declare(strict_types=1);
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* Additional emphasis processing code based on commonmark-java (https://github.com/atlassian/commonmark-java)
* - (c) Atlassian Pty Ltd
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Node\Inline;
use League\CommonMark\Node\Node;
/**
* @internal
*/
final class AdjacentTextMerger
{
public static function mergeChildNodes(Node $node): void
{
// No children or just one child node, no need for merging
if ($node->firstChild() === $node->lastChild() || $node->firstChild() === null || $node->lastChild() === null) {
return;
}
/** @psalm-suppress PossiblyNullArgument */
self::mergeTextNodesInclusive($node->firstChild(), $node->lastChild());
}
public static function mergeTextNodesBetweenExclusive(Node $fromNode, Node $toNode): void
{
// No nodes between them
if ($fromNode === $toNode || $fromNode->next() === $toNode || $fromNode->next() === null || $toNode->previous() === null) {
return;
}
/** @psalm-suppress PossiblyNullArgument */
self::mergeTextNodesInclusive($fromNode->next(), $toNode->previous());
}
public static function mergeWithDirectlyAdjacentNodes(Text $node): void
{
$start = ($previous = $node->previous()) instanceof Text ? $previous : $node;
$end = ($next = $node->next()) instanceof Text ? $next : $node;
self::mergeIfNeeded($start, $end);
}
private static function mergeTextNodesInclusive(Node $fromNode, Node $toNode): void
{
$first = null;
$last = null;
$node = $fromNode;
while ($node !== null) {
if ($node instanceof Text) {
if ($first === null) {
$first = $node;
}
$last = $node;
} else {
self::mergeIfNeeded($first, $last);
$first = null;
$last = null;
}
if ($node === $toNode) {
break;
}
$node = $node->next();
}
self::mergeIfNeeded($first, $last);
}
private static function mergeIfNeeded(?Text $first, ?Text $last): void
{
if ($first === null || $last === null || $first === $last) {
// No merging needed
return;
}
$s = $first->getLiteral();
$node = $first->next();
$stop = $last->next();
while ($node !== $stop && $node instanceof Text) {
$s .= $node->getLiteral();
$unlink = $node;
$node = $node->next();
$unlink->detach();
}
$first->setLiteral($s);
}
}
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