Class: Bmg::Sql::Processor::Transform

Inherits:
Bmg::Sql::Processor show all
Defined in:
lib/bmg/sql/processor/transform.rb

Defined Under Namespace

Modules: SplitSupported

Constant Summary

Constants inherited from Bmg::Sql::Processor

UnexpectedError

Instance Attribute Summary collapse

Attributes inherited from Bmg::Sql::Processor

#builder

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Bmg::Sql::Processor

#on_select_exp, #on_set_operator, #on_with_exp

Constructor Details

#initialize(transformation, options, builder) ⇒ Transform

module SplitSupported

Raises:



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# File 'lib/bmg/sql/processor/transform.rb', line 42

def initialize(transformation, options, builder)
  raise NotSupportedError unless options.empty?
  super(builder)
  @transformation = transformation
end

Instance Attribute Details

#transformation ⇒ Object (readonly)

Returns the value of attribute transformation.



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# File 'lib/bmg/sql/processor/transform.rb', line 47

def transformation
  @transformation
end

Class Method Details

.split_supported(*args, &bl) ⇒ Object 



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# File 'lib/bmg/sql/processor/transform.rb', line 49

def self.split_supported(*args, &bl)
  SplitSupported.split_supported(*args, &bl)
end

Instance Method Details

#on_select_item(sexpr) ⇒ Object 



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# File 'lib/bmg/sql/processor/transform.rb', line 59

def on_select_item(sexpr)
  as = sexpr.as_name.to_sym
  case t = transformation_for(as)
  when NilClass
    sexpr
  when Class, Array
    sexpr([:select_item,
      func_call_node(sexpr, Array(t).reverse),
      sexpr[2]
    ])
  else
    raise NotSupportedError
  end
end

#on_select_list(sexpr) ⇒ Object 



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# File 'lib/bmg/sql/processor/transform.rb', line 53

def on_select_list(sexpr)
  sexpr.each_with_index.map{|child,index|
    index == 0 ? child : apply(child)
  }
end