AvoidIdSniff.php

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<?php
namespace Magento\Sniffs\Less;

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

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

    private $selectorTokens = [
        T_HASH,
        T_WHITESPACE,
        T_STRING_CONCAT,
        T_OPEN_PARENTHESIS,
        T_CLOSE_PARENTHESIS,
        T_OPEN_SQUARE_BRACKET,
        T_CLOSE_SQUARE_BRACKET,
        T_DOUBLE_QUOTED_STRING,
        T_CONSTANT_ENCAPSED_STRING,
        T_DOUBLE_COLON,
        T_COLON,
        T_EQUAL,
        T_MUL_EQUAL,
        T_OR_EQUAL,
        T_STRING,
        T_NONE,
        T_DOLLAR,
        T_GREATER_THAN,
        T_PLUS,
        T_NS_SEPARATOR,
        T_LNUMBER,
    ];

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

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

        // Find the next non-selector token
        $nextToken = $phpcsFile->findNext($this->selectorTokens, $stackPtr + 1, null, true);

        // Anything except a { or a , means this is not a selector
        if ($nextToken !== false && in_array($tokens[$nextToken]['code'], [T_OPEN_CURLY_BRACKET, T_COMMA])) {
            $phpcsFile->addError('Id selector is used', $stackPtr, 'IdSelectorUsage');
        }
    }
}