PropertiesLineBreakSniff.php

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<?php
namespace Magento\Sniffs\Less;

use PHP_CodeSniffer\Sniffs\Sniff;
use PHP_CodeSniffer\Files\File;

class PropertiesLineBreakSniff implements Sniff
{
    public $supportedTokenizers = [TokenizerSymbolsInterface::TOKENIZER_CSS];

    public function register()
    {
        return [T_SEMICOLON];
    }

    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

        $prevPtr = $phpcsFile->findPrevious(T_SEMICOLON, ($stackPtr - 1));
        if (false === $prevPtr) {
            return;
        }

        if ($tokens[$prevPtr]['line'] === $tokens[$stackPtr]['line']) {
            $error = 'Each property must be on a line by itself';
            $phpcsFile->addError($error, $stackPtr, 'SameLine');
        }
    }
}