class GlobalConstantSniff

class GlobalConstantSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_CONST,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The current file being processed.
     * @param int                         $stackPtr  The position of the current token
     *                                               in the stack passed in $tokens.
     *
     * @return void|int
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        // Only check constants in the global scope.
        if (empty($tokens[$stackPtr]['conditions']) === false) {
            return;
        }
        $coreVersion = Project::getCoreVersion($phpcsFile);
        if ($coreVersion < 8) {
            // No need to check this file again, mark it as done.
            return $phpcsFile->numTokens + 1;
        }
        // Allow constants if they are deprecated.
        $commentEnd = $phpcsFile->findPrevious(T_WHITESPACE, $stackPtr - 1, null, true);
        if ($commentEnd !== null && $tokens[$commentEnd]['code'] === T_DOC_COMMENT_CLOSE_TAG) {
            // Go through all comment tags and check if one is @deprecated.
            $commentTag = $commentEnd;
            while ($commentTag !== null && $commentTag > $tokens[$commentEnd]['comment_opener']) {
                if ($tokens[$commentTag]['content'] === '@deprecated') {
                    return;
                }
                $commentTag = $phpcsFile->findPrevious(T_DOC_COMMENT_TAG, $commentTag - 1, $tokens[$commentEnd]['comment_opener']);
            }
        }
        $warning = 'Global constants should not be used, move it to a class or interface';
        $phpcsFile->addWarning($warning, $stackPtr, 'GlobalConstant');
    }
    
    //end process()

}