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<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <[email protected]>
 *     Dariusz Rumiński <[email protected]>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer;

use PhpCsFixer\ConfigurationException\RequiredFixerConfigurationException;
use PhpCsFixer\Fixer\ConfigurableFixerInterface;
use PhpCsFixer\Fixer\FixerInterface;
use PhpCsFixer\Fixer\WhitespacesAwareFixerInterface;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Dariusz Rumiński <[email protected]>
 *
 * @internal
 */
abstract class AbstractFixer implements FixerInterface
{
    /**
     * @var WhitespacesFixerConfig
     */
    protected $whitespacesConfig;

    public function __construct()
    {
        if ($this instanceof ConfigurableFixerInterface) {
            try {
                $this->configure([]);
            } catch (RequiredFixerConfigurationException $e) {
                // ignore
            }
        }

        if ($this instanceof WhitespacesAwareFixerInterface) {
            $this->whitespacesConfig = $this->getDefaultWhitespacesFixerConfig();
        }
    }

    final public function fix(\SplFileInfo $file, Tokens $tokens): void
    {
        if ($this instanceof ConfigurableFixerInterface && property_exists($this, 'configuration') && null === $this->configuration) {
            throw new RequiredFixerConfigurationException($this->getName(), 'Configuration is required.');
        }

        if (0 < $tokens->count() && $this->isCandidate($tokens) && $this->supports($file)) {
            $this->applyFix($file, $tokens);
        }
    }

    public function isRisky(): bool
    {
        return false;
    }

    public function getName(): string
    {
        $nameParts = explode('\\', static::class);
        $name = substr(end($nameParts), 0, -\strlen('Fixer'));

        return Utils::camelCaseToUnderscore($name);
    }

    public function getPriority(): int
    {
        return 0;
    }

    public function supports(\SplFileInfo $file): bool
    {
        return true;
    }

    public function setWhitespacesConfig(WhitespacesFixerConfig $config): void
    {
        if (!$this instanceof WhitespacesAwareFixerInterface) {
            throw new \LogicException('Cannot run method for class not implementing "PhpCsFixer\Fixer\WhitespacesAwareFixerInterface".');
        }

        $this->whitespacesConfig = $config;
    }

    abstract protected function applyFix(\SplFileInfo $file, Tokens $tokens): void;

    private function getDefaultWhitespacesFixerConfig(): WhitespacesFixerConfig
    {
        static $defaultWhitespacesFixerConfig = null;

        if (null === $defaultWhitespacesFixerConfig) {
            $defaultWhitespacesFixerConfig = new WhitespacesFixerConfig('    ', "\n");
        }

        return $defaultWhitespacesFixerConfig;
    }
}