ControlSignatureSniff.php

<?php

if (class_exists('PHP_CodeSniffer_Standards_AbstractPatternSniff', true) === false) {
    throw new PHP_CodeSniffer_Exception('Class PHP_CodeSniffer_Standards_AbstractPatternSniff not found');
}


class SilverStripe_Sniffs_ControlStructures_ControlSignatureSniff implements PHP_CodeSniffer_Sniff
{

    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = array(
                                   'PHP',
                                   'JS',
                                  );


    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array
     */
    public function register()
    {
        return array(
                T_IF,
                T_ELSE,
                T_ELSEIF,
                T_FOREACH,
                T_WHILE,
                T_DO,
                T_SWITCH,
                T_FOR,
                T_TRY,
                T_CATCH,
               );

    }

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

        // Ignore the ELSE in ELSE IF. We'll process the IF part later when the parser gets to it
        if(($tokens[$stackPtr]['code'] === T_ELSE) && ($tokens[($stackPtr + 2)]['code'] === T_IF)) {
            return;
        }

        // If the control structure has parenthesis, get the position of the opening one
        // If not, we ain't interested, so return
        if(isset($tokens[$stackPtr]['parenthesis_opener']) === true) {
            $checkPosition = $tokens[$stackPtr]['parenthesis_opener'];
        } else {
            return;
        }

        if($tokens[$checkPosition-1]['code'] === T_WHITESPACE) {
            $phpcsFile->addError('Control structures with whitespace before parenthesis are not allowed.', $stackPtr, 'NotAllowed');
            return;
        }

        return;

    }


}