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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\Phpdoc;

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

/**
 * @author Graham Campbell <[email protected]>
 */
final class NoBlankLinesAfterPhpdocFixer extends AbstractFixer
{
    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isTokenKindFound(T_DOC_COMMENT);
    }

    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'There should not be blank lines between docblock and the documented element.',
            [
                new CodeSample(
                    '<?php

/**
 * This is the bar class.
 */


class Bar {}
'
                ),
            ]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run before HeaderCommentFixer, PhpdocAlignFixer.
     * Must run after AlignMultilineCommentFixer, CommentToPhpdocFixer, PhpdocIndentFixer, PhpdocScalarFixer, PhpdocToCommentFixer, PhpdocTypesFixer.
     */
    public function getPriority(): int
    {
        return -20;
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        static $forbiddenSuccessors = [
            T_BREAK,
            T_COMMENT,
            T_CONTINUE,
            T_DECLARE,
            T_DOC_COMMENT,
            T_GOTO,
            T_INCLUDE,
            T_INCLUDE_ONCE,
            T_NAMESPACE,
            T_REQUIRE,
            T_REQUIRE_ONCE,
            T_RETURN,
            T_THROW,
            T_USE,
            T_WHITESPACE,
        ];

        foreach ($tokens as $index => $token) {
            if (!$token->isGivenKind(T_DOC_COMMENT)) {
                continue;
            }
            // get the next non-whitespace token inc comments, provided
            // that there is whitespace between it and the current token
            $next = $tokens->getNextNonWhitespace($index);
            if ($index + 2 === $next && false === $tokens[$next]->isGivenKind($forbiddenSuccessors)) {
                $this->fixWhitespace($tokens, $index + 1);
            }
        }
    }

    /**
     * Cleanup a whitespace token.
     */
    private function fixWhitespace(Tokens $tokens, int $index): void
    {
        $content = $tokens[$index]->getContent();
        // if there is more than one new line in the whitespace, then we need to fix it
        if (substr_count($content, "\n") > 1) {
            // the final bit of the whitespace must be the next statement's indentation
            $tokens[$index] = new Token([T_WHITESPACE, substr($content, strrpos($content, "\n"))]);
        }
    }
}