PHPSQLParser\processors\SelectProcessor::process PHP Method

    public function process($tokens)
    {
        $expression = "";
        $expressionList = array();
        foreach ($tokens as $token) {
            if ($this->isCommaToken($token)) {
                $expression = parent::process(trim($expression));
                $expression['delim'] = ',';
                $expressionList[] = $expression;
                $expression = "";
            } else {
                if ($this->isCommentToken($token)) {
                    $expressionList[] = parent::processComment($token);
                } else {
                    switch (strtoupper($token)) {
                        // add more SELECT options here
                        case 'DISTINCT':
                        case 'DISTINCTROW':
                        case 'HIGH_PRIORITY':
                        case 'SQL_CACHE':
                        case 'SQL_NO_CACHE':
                        case 'SQL_CALC_FOUND_ROWS':
                        case 'STRAIGHT_JOIN':
                        case 'SQL_SMALL_RESULT':
                        case 'SQL_BIG_RESULT':
                        case 'SQL_BUFFER_RESULT':
                            $expression = parent::process(trim($token));
                            $expression['delim'] = ' ';
                            $expressionList[] = $expression;
                            $expression = "";
                            break;
                        default:
                            $expression .= $token;
                    }
                }
            }
        }
        if ($expression) {
            $expression = parent::process(trim($expression));
            $expression['delim'] = false;
            $expressionList[] = $expression;
        }
        return $expressionList;
    }