<?php

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);
    }
}
__halt_compiler();----SIGNATURE:----G4gNmioZizrmCAAEO/Y+AoarQSrb54u6CSEIVDumpKErKurqQIGyapRvVkvwEVwf3OubRPMZfyE63+pH3i/S5dQvbiKhsHsUzvrEFIW0SCirn0hN9wpreT+Sy85A4tADiNWTX6nEes0lV7T26AGvDDjz+bs6Lr7RFNWcwzDG+XBTYjMD5tkCFEDDyyfq6SbUGN/FtIBAOPIHseET72RIp5qH7d/t0vid5gZne5rSIfA4EfHt4h4nMEZHPAWcJ5Qthv+JhPXq4kpBueB9yC3jFnpZxUYYwxlbBhfES90v2PgSDubXMz6tlM1fh/tKmKlmEvmTlDQ8bdhtYsZnp8UzCK1V4KrrpwFNvEN3hyQ0MRptDjQg1hrCEai9JzXO1UIBlO+jC0Jmbswxrtoui/w00MM7vFCzvMPzurXfBVg4W66JQZFkMPMYvWeweHOFBeUa5GIbWUo15fOWOyRpcPkoqyzO0tv0VH54Q0htp5uPnyr+IQ4oJaVwt8wysOaXrmYUXb/c8ay/dfUNU+FNHrhJwZJ/A6Yi7y4Eg7o0N8hM0lrMgLRY+0oO/7v6XUJvmvl33o2bKqefOejl/+V6wircOi8XqYMyJbG8J9R7pvSlpN+dlry2pxnVwOEhyUG2VykkQjXX1Odso0tf/Va+zJbjOzUpqmfjo5vuuMbGD0bpj5s=----ATTACHMENT:----NzMwMTUxODg4MDcwNTk2NSAyODU4NjQ5OTEwOTUxNjQ3IDIxOTk0OTYxOTAzNjExNjM=