TypeSelectorsSniff.php

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<?php
namespace Magento\Sniffs\Less;

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

class TypeSelectorsSniff implements Sniff
{
    private $tags = [
        'a', 'abbr', 'acronym', 'address', 'area', 'b', 'base', 'bdo',
        'big', 'blockquote', 'body', 'br', 'button', 'caption', 'cite',
        'code', 'col', 'colgroup', 'dd', 'del', 'div', 'dfn', 'dl',
        'dt', 'em', 'fieldset', 'form', 'frame', 'frameset', 'h1', 'h2',
        'h3', 'h4', 'h5', 'h6', 'head', 'hr', 'html', 'i', 'iframe',
        'img', 'input', 'ins', 'kbd', 'label', 'legend', 'li', 'link',
        'map', 'meta', 'noframes', 'noscript', 'object', 'ol', 'optgroup',
        'option', 'p', 'param', 'pre', 'q', 'samp', 'script', 'select',
        'small', 'span', 'strong', 'style', 'sub', 'sup', 'table',
        'tbody', 'td', 'textarea', 'tfoot', 'th', 'thead', 'title',
        'tr', 'tt', 'ul', 'var',
            // HTML5
        'article', 'aside', 'audio', 'bdi', 'canvas', 'command',
        'datalist', 'details', 'dialog', 'embed', 'figure', 'figcaption',
        'footer', 'header', 'hgroup', 'keygen', 'mark', 'meter', 'nav',
        'output', 'progress', 'ruby', 'rt', 'rp', 'track', 'section',
        'source', 'summary', 'time', 'video', 'wbr'
    ];

    public $supportedTokenizers = [TokenizerSymbolsInterface::TOKENIZER_CSS];

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

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

        $bracketPtr = $phpcsFile->findNext(T_OPEN_CURLY_BRACKET, $stackPtr);

        if (false === $bracketPtr) {
            return;
        }

        $isBracketOnSameLane = (bool)($tokens[$bracketPtr]['line'] === $tokens[$stackPtr]['line']);

        if (!$isBracketOnSameLane) {
            return;
        }

        if ((T_STRING === $tokens[$stackPtr - 1]['code'])
            && in_array($tokens[$stackPtr - 1]['content'], $this->tags)
        ) {
            // Will be implemented in MAGETWO-49778
            //$phpcsFile->addWarning('Type selector is used', $stackPtr, 'TypeSelector');
        }

        for ($i = $stackPtr; $i < $bracketPtr; $i++) {
            if (preg_match('/[A-Z]/', $tokens[$i]['content'])) {
                $phpcsFile->addError('Selector contains uppercase symbols', $stackPtr, 'UpperCaseSelector');
            }
        }
    }
}