<?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);
    }
}

• [F] AbstractInline.php
  Delete
• [F] AbstractStringContainer.php
  Delete
• [F] AdjacentTextMerger.php
  Delete
• [F] DelimitedInterface.php
  Delete
• [F] Newline.php
  Delete
• [F] Text.php
  Delete

Blog Section

Discover the Latest in Digital Payments and NFC Technology

Dive into our blog to explore the cutting-edge trends in digital payments and NFC technology. Stay updated on the innovations that are revolutionizing transactions, boosting security, and making payments quicker and more convenient. Learn how these advancements are shaping the future of financial interactions and driving the global transition towards a cashless world.

The Rise of Contactless Payments:...

In recent years, contactless payments have surged in popularity, driven...

Visit Blog

March 27, 2024

Enhancing Payment Security: The Role...

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational...

Visit Blog

March 27, 2024

The Future of Digital Wallets:...

Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly...

Visit Blog

March 27, 2024