ImportantPropertySniff.php

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<?php
namespace Magento\Sniffs\Less;

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

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

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

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

        // Will be implemented in MAGETWO-49778
        //$phpcsFile->addWarning('!important is used', $stackPtr, '!ImportantIsUsed');

        if (($tokens[$stackPtr + 1]['content'] === 'important')
            && ($tokens[$stackPtr - 1]['content'] !== TokenizerSymbolsInterface::WHITESPACE)
        ) {
            $phpcsFile->addError('Space before !important is missing', $stackPtr, 'NoSpace');
        }
    }
}