<?php

namespace League\CommonMark\Delimiter\Processor;

use League\CommonMark\Delimiter\DelimiterInterface;
use League\CommonMark\Exception\InvalidArgumentException;
use League\CommonMark\Node\Inline\AbstractStringContainer;

/**
 * An implementation of DelimiterProcessorInterface that dispatches all calls to two or more other DelimiterProcessors
 * depending on the length of the delimiter run. All child DelimiterProcessors must have different minimum
 * lengths. A given delimiter run is dispatched to the child with the largest acceptable minimum length. If no
 * child is applicable, the one with the largest minimum length is chosen.
 *
 * @internal
 */
final class StaggeredDelimiterProcessor implements DelimiterProcessorInterface
{
    /** @psalm-readonly */
    private string $delimiterChar;

    /** @psalm-readonly-allow-private-mutation */
    private int $minLength = 0;

    /**
     * @var array<int, DelimiterProcessorInterface>|DelimiterProcessorInterface[]
     *
     * @psalm-readonly-allow-private-mutation
     */
    private array $processors = [];

    public function __construct(string $char, DelimiterProcessorInterface $processor)
    {
        $this->delimiterChar = $char;
        $this->add($processor);
    }

    public function getOpeningCharacter(): string
    {
        return $this->delimiterChar;
    }

    public function getClosingCharacter(): string
    {
        return $this->delimiterChar;
    }

    public function getMinLength(): int
    {
        return $this->minLength;
    }

    /**
     * Adds the given processor to this staggered delimiter processor
     *
     * @throws InvalidArgumentException if attempting to add another processors for the same character and minimum length
     */
    public function add(DelimiterProcessorInterface $processor): void
    {
        $len = $processor->getMinLength();

        if (isset($this->processors[$len])) {
            throw new InvalidArgumentException(\sprintf('Cannot add two delimiter processors for char "%s" and minimum length %d', $this->delimiterChar, $len));
        }

        $this->processors[$len] = $processor;
        \krsort($this->processors);

        $this->minLength = \min($this->minLength, $len);
    }

    public function getDelimiterUse(DelimiterInterface $opener, DelimiterInterface $closer): int
    {
        return $this->findProcessor($opener->getLength())->getDelimiterUse($opener, $closer);
    }

    public function process(AbstractStringContainer $opener, AbstractStringContainer $closer, int $delimiterUse): void
    {
        $this->findProcessor($delimiterUse)->process($opener, $closer, $delimiterUse);
    }

    private function findProcessor(int $len): DelimiterProcessorInterface
    {
        // Find the "longest" processor which can handle this length
        foreach ($this->processors as $processor) {
            if ($processor->getMinLength() <= $len) {
                return $processor;
            }
        }

        // Just use the first one in our list
        $first = \reset($this->processors);
        \assert($first instanceof DelimiterProcessorInterface);

        return $first;
    }
}
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