SqlParser\Components\OrderKeyword::parse PHP Method

    public static function parse(Parser $parser, TokensList $list, array $options = array())
    {
        $ret = array();
        $expr = new OrderKeyword();
        /**
         * The state of the parser.
         *
         * Below are the states of the parser.
         *
         *      0 --------------------[ expression ]-------------------> 1
         *
         *      1 ------------------------[ , ]------------------------> 0
         *      1 -------------------[ ASC / DESC ]--------------------> 1
         *
         * @var int $state
         */
        $state = 0;
        for (; $list->idx < $list->count; ++$list->idx) {
            /**
             * Token parsed at this moment.
             *
             * @var Token $token
             */
            $token = $list->tokens[$list->idx];
            // End of statement.
            if ($token->type === Token::TYPE_DELIMITER) {
                break;
            }
            // Skipping whitespaces and comments.
            if ($token->type === Token::TYPE_WHITESPACE || $token->type === Token::TYPE_COMMENT) {
                continue;
            }
            if ($state === 0) {
                $expr->expr = Expression::parse($parser, $list);
                $state = 1;
            } elseif ($state === 1) {
                if ($token->type === Token::TYPE_KEYWORD && ($token->value === 'ASC' || $token->value === 'DESC')) {
                    $expr->type = $token->value;
                } elseif ($token->type === Token::TYPE_OPERATOR && $token->value === ',') {
                    if (!empty($expr->expr)) {
                        $ret[] = $expr;
                    }
                    $expr = new OrderKeyword();
                    $state = 0;
                } else {
                    break;
                }
            }
        }
        // Last iteration was not processed.
        if (!empty($expr->expr)) {
            $ret[] = $expr;
        }
        --$list->idx;
        return $ret;
    }

 /**
  * @param Parser     $parser The instance that requests parsing.
  * @param TokensList $list   The list of tokens to be parsed.
  *
  * @return void
  */
 public function parse(Parser $parser, TokensList $list)
 {
     ++$list->idx;
     // Skipping `DELETE`.
     // parse any options if provided
     $this->options = OptionsArray::parse($parser, $list, static::$OPTIONS);
     ++$list->idx;
     /**
      * The state of the parser.
      *
      * Below are the states of the parser.
      *
      *      0 ---------------------------------[ FROM ]----------------------------------> 2
      *      0 ------------------------------[ table[.*] ]--------------------------------> 1
      *      1 ---------------------------------[ FROM ]----------------------------------> 2
      *      2 --------------------------------[ USING ]----------------------------------> 3
      *      2 --------------------------------[ WHERE ]----------------------------------> 4
      *      2 --------------------------------[ ORDER ]----------------------------------> 5
      *      2 --------------------------------[ LIMIT ]----------------------------------> 6
      *
      * @var int $state
      */
     $state = 0;
     /**
      * If the query is multi-table or not
      *
      * @var bool $multiTable
      */
     $multiTable = false;
     for (; $list->idx < $list->count; ++$list->idx) {
         /**
          * Token parsed at this moment.
          *
          * @var Token $token
          */
         $token = $list->tokens[$list->idx];
         // End of statement.
         if ($token->type === Token::TYPE_DELIMITER) {
             break;
         }
         if ($state === 0) {
             if ($token->type === Token::TYPE_KEYWORD && $token->value !== 'FROM') {
                 $parser->error(__('Unexpected keyword.'), $token);
                 break;
             } elseif ($token->type === Token::TYPE_KEYWORD && $token->value === 'FROM') {
                 ++$list->idx;
                 // Skip 'FROM'
                 $this->from = ExpressionArray::parse($parser, $list);
                 $state = 2;
             } else {
                 $this->columns = ExpressionArray::parse($parser, $list);
                 $state = 1;
             }
         } elseif ($state === 1) {
             if ($token->type === Token::TYPE_KEYWORD && $token->value !== 'FROM') {
                 $parser->error(__('Unexpected keyword.'), $token);
                 break;
             } elseif ($token->type === Token::TYPE_KEYWORD && $token->value === 'FROM') {
                 ++$list->idx;
                 // Skip 'FROM'
                 $this->from = ExpressionArray::parse($parser, $list);
                 $state = 2;
             } else {
                 $parser->error(__('Unexpected token.'), $token);
                 break;
             }
         } elseif ($state === 2) {
             if ($token->type === Token::TYPE_KEYWORD && $token->value === 'USING') {
                 ++$list->idx;
                 // Skip 'USING'
                 $this->using = ExpressionArray::parse($parser, $list);
                 $state = 3;
                 $multiTable = true;
             } elseif ($token->type === Token::TYPE_KEYWORD && $token->value === 'WHERE') {
                 ++$list->idx;
                 // Skip 'WHERE'
                 $this->where = Condition::parse($parser, $list);
                 $state = 4;
             } elseif ($token->type === Token::TYPE_KEYWORD && $token->value === 'ORDER BY') {
                 ++$list->idx;
                 // Skip 'ORDER BY'
                 $this->order = OrderKeyword::parse($parser, $list);
                 $state = 5;
             } elseif ($token->type === Token::TYPE_KEYWORD && $token->value === 'LIMIT') {
                 ++$list->idx;
                 // Skip 'LIMIT'
                 $this->limit = Limit::parse($parser, $list);
                 $state = 6;
             } elseif ($token->type === Token::TYPE_KEYWORD) {
                 $parser->error(__('Unexpected keyword.'), $token);
                 break;
             }
         } elseif ($state === 3) {
             if ($token->type === Token::TYPE_KEYWORD && $token->value === 'WHERE') {
                 ++$list->idx;
                 // Skip 'WHERE'
                 $this->where = Condition::parse($parser, $list);
                 $state = 4;
             } elseif ($token->type === Token::TYPE_KEYWORD) {
                 $parser->error(__('Unexpected keyword.'), $token);
                 break;
             } else {
                 $parser->error(__('Unexpected token.'), $token);
                 break;
             }
         } elseif ($state === 4) {
             if ($multiTable === true && $token->type === Token::TYPE_KEYWORD) {
                 $parser->error(__('This type of clause is not valid in Multi-table queries.'), $token);
                 break;
             }
             if ($token->type === Token::TYPE_KEYWORD && $token->value === 'ORDER BY') {
                 ++$list->idx;
                 // Skip 'ORDER  BY'
                 $this->order = OrderKeyword::parse($parser, $list);
                 $state = 5;
             } elseif ($token->type === Token::TYPE_KEYWORD && $token->value === 'LIMIT') {
                 ++$list->idx;
                 // Skip 'LIMIT'
                 $this->limit = Limit::parse($parser, $list);
                 $state = 6;
             } elseif ($token->type === Token::TYPE_KEYWORD) {
                 $parser->error(__('Unexpected keyword.'), $token);
                 break;
             }
         } elseif ($state === 5) {
             if ($token->type === Token::TYPE_KEYWORD && $token->value === 'LIMIT') {
                 ++$list->idx;
                 // Skip 'LIMIT'
                 $this->limit = Limit::parse($parser, $list);
                 $state = 6;
             } elseif ($token->type === Token::TYPE_KEYWORD) {
                 $parser->error(__('Unexpected keyword.'), $token);
                 break;
             }
         }
     }
     if ($state >= 2) {
         foreach ($this->from as $from_expr) {
             $from_expr->database = $from_expr->table;
             $from_expr->table = $from_expr->column;
             $from_expr->column = null;
         }
     }
     --$list->idx;
 }