class NamedColoursSniff

class NamedColoursSniff implements Sniff {
    
    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = [
        'CSS',
    ];
    
    /**
     * A list of named colours.
     *
     * This is the list of standard colours defined in the CSS specification.
     *
     * @var array
     */
    protected $colourNames = [
        'aqua' => 'aqua',
        'black' => 'black',
        'blue' => 'blue',
        'fuchsia' => 'fuchsia',
        'gray' => 'gray',
        'green' => 'green',
        'lime' => 'lime',
        'maroon' => 'maroon',
        'navy' => 'navy',
        'olive' => 'olive',
        'orange' => 'orange',
        'purple' => 'purple',
        'red' => 'red',
        'silver' => 'silver',
        'teal' => 'teal',
        'white' => 'white',
        'yellow' => 'yellow',
    ];
    
    /**
     * Returns the token types that this sniff is interested in.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_STRING,
        ];
    }
    
    //end register()
    
    /**
     * Processes the tokens that this sniff is interested in.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file where the token was found.
     * @param int                         $stackPtr  The position in the stack where
     *                                               the token was found.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        if ($tokens[$stackPtr - 1]['code'] === T_HASH || $tokens[$stackPtr - 1]['code'] === T_STRING_CONCAT) {
            // Class name.
            return;
        }
        if (isset($this->colourNames[strtolower($tokens[$stackPtr]['content'])]) === true) {
            $error = 'Named colours are forbidden; use hex, rgb, or rgba values instead';
            $phpcsFile->addError($error, $stackPtr, 'Forbidden');
        }
    }
    
    //end process()

}