ColourDefinitionSniff.php

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<?php
namespace Magento\Sniffs\Less;

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

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

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

    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();
        $colour = $tokens[$stackPtr]['content'];

        $variablePtr = $phpcsFile->findPrevious(T_ASPERAND, $stackPtr);
        if ((false === $variablePtr) || ($tokens[$stackPtr]['line'] !== $tokens[$variablePtr]['line'])) {
            $phpcsFile->addError('Hexadecimal value should be used for variable', $stackPtr, 'NotInVariable');
        }

        $expected = strtolower($colour);
        if ($colour !== $expected) {
            $error = 'CSS colours must be defined in lowercase; expected %s but found %s';
            $phpcsFile->addError($error, $stackPtr, 'NotLower', [$expected, $colour]);
        }

        // Now check if shorthand can be used.
        if (strlen($colour) !== 7) {
            return;
        }

        if ($colour[1] === $colour[2] && $colour[3] === $colour[4] && $colour[5] === $colour[6]) {
            $expected = '#' . $colour[1] . $colour[3] . $colour[5];
            $error = 'CSS colours must use shorthand if available; expected %s but found %s';
            $phpcsFile->addError($error, $stackPtr, 'Shorthand', [$expected, $colour]);
        }
    }
}