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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\Fixer\LanguageConstruct;

use PhpCsFixer\AbstractFunctionReferenceFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Vladimir Reznichenko <[email protected]>
 */
final class DirConstantFixer extends AbstractFunctionReferenceFixer
{
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Replaces `dirname(__FILE__)` expression with equivalent `__DIR__` constant.',
            [new CodeSample("<?php\n\$a = dirname(__FILE__);\n")],
            null,
            'Risky when the function `dirname` is overridden.'
        );
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isAllTokenKindsFound([T_STRING, T_FILE]);
    }

    /**
     * {@inheritdoc}
     *
     * Must run before CombineNestedDirnameFixer.
     */
    public function getPriority(): int
    {
        return 40;
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        $currIndex = 0;

        do {
            $boundaries = $this->find('dirname', $tokens, $currIndex, $tokens->count() - 1);
            if (null === $boundaries) {
                return;
            }

            [$functionNameIndex, $openParenthesis, $closeParenthesis] = $boundaries;

            // analysing cursor shift, so nested expressions kept processed
            $currIndex = $openParenthesis;

            // ensure __FILE__ is in between (...)

            $fileCandidateRightIndex = $tokens->getPrevMeaningfulToken($closeParenthesis);
            $trailingCommaIndex = null;

            if ($tokens[$fileCandidateRightIndex]->equals(',')) {
                $trailingCommaIndex = $fileCandidateRightIndex;
                $fileCandidateRightIndex = $tokens->getPrevMeaningfulToken($fileCandidateRightIndex);
            }

            $fileCandidateRight = $tokens[$fileCandidateRightIndex];

            if (!$fileCandidateRight->isGivenKind(T_FILE)) {
                continue;
            }

            $fileCandidateLeftIndex = $tokens->getNextMeaningfulToken($openParenthesis);
            $fileCandidateLeft = $tokens[$fileCandidateLeftIndex];

            if (!$fileCandidateLeft->isGivenKind(T_FILE)) {
                continue;
            }

            // get rid of root namespace when it used
            $namespaceCandidateIndex = $tokens->getPrevMeaningfulToken($functionNameIndex);
            $namespaceCandidate = $tokens[$namespaceCandidateIndex];

            if ($namespaceCandidate->isGivenKind(T_NS_SEPARATOR)) {
                $tokens->removeTrailingWhitespace($namespaceCandidateIndex);
                $tokens->clearAt($namespaceCandidateIndex);
            }

            if (null !== $trailingCommaIndex) {
                if (!$tokens[$tokens->getNextNonWhitespace($trailingCommaIndex)]->isComment()) {
                    $tokens->removeTrailingWhitespace($trailingCommaIndex);
                }

                $tokens->clearTokenAndMergeSurroundingWhitespace($trailingCommaIndex);
            }

            // closing parenthesis removed with leading spaces
            if (!$tokens[$tokens->getNextNonWhitespace($closeParenthesis)]->isComment()) {
                $tokens->removeLeadingWhitespace($closeParenthesis);
            }

            $tokens->clearTokenAndMergeSurroundingWhitespace($closeParenthesis);

            // opening parenthesis removed with trailing and leading spaces
            if (!$tokens[$tokens->getNextNonWhitespace($openParenthesis)]->isComment()) {
                $tokens->removeLeadingWhitespace($openParenthesis);
            }

            $tokens->removeTrailingWhitespace($openParenthesis);
            $tokens->clearTokenAndMergeSurroundingWhitespace($openParenthesis);

            // replace constant and remove function name
            $tokens[$fileCandidateLeftIndex] = new Token([T_DIR, '__DIR__']);
            $tokens->clearTokenAndMergeSurroundingWhitespace($functionNameIndex);
        } while (null !== $currIndex);
    }
}