Class: SQLTree::Node::Ordering

Inherits:
Base
  • Object
show all
Defined in:
lib/sql_tree/node/ordering.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

[], #inspect, #quote_str, #quote_var

Constructor Details

#initialize(expression, direction = nil) ⇒ Ordering

Returns a new instance of Ordering.



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# File 'lib/sql_tree/node/ordering.rb', line 7

def initialize(expression, direction = nil)
  @expression, @direction = expression, direction
end

Instance Attribute Details

#direction ⇒ Object

Returns the value of attribute direction.



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# File 'lib/sql_tree/node/ordering.rb', line 5

def direction
  @direction
end

#expression ⇒ Object

Returns the value of attribute expression.



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# File 'lib/sql_tree/node/ordering.rb', line 5

def expression
  @expression
end

Class Method Details

.parse(tokens) ⇒ Object 



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# File 'lib/sql_tree/node/ordering.rb', line 17

def self.parse(tokens)
  ordering = self.new(SQLTree::Node::Expression.parse(tokens))
  if tokens.peek && tokens.peek.direction?
    ordering.direction = tokens.next.literal.downcase.to_sym
  end
  return ordering
end

Instance Method Details

#to_sql ⇒ Object 



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# File 'lib/sql_tree/node/ordering.rb', line 11

def to_sql
  sql = expression.to_sql
  sql << " #{direction.to_s.upcase}" if direction
  sql
end