Class: Piglet::Field::PrefixExpression

Inherits:
Object
  • Object
show all
Includes:
Field
Defined in:
lib/piglet/field/prefix_expression.rb

Overview

:nodoc:

Constant Summary

Constants included from Field

Field::FUNCTIONS, Field::SYMBOLIC_OPERATORS

Instance Attribute Summary collapse

Attributes included from Field

#name, #predecessors, #type

Instance Method Summary collapse

Methods included from Field

#and, #as, #cast, #diff, #distinct, #empty?, #field, #field_alias, #filter, #flatten, #generate_field_alias, #get, #limit, #matches, #ne, #neg, #not, #not_null?, #null?, #or, #order, #sample

Constructor Details

#initialize(operator, expression, space_between = true, options = nil) ⇒ PrefixExpression

Returns a new instance of PrefixExpression.



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# File 'lib/piglet/field/prefix_expression.rb', line 10

def initialize(operator, expression, space_between=true, options=nil)
  options ||= {}
  @operator, @expression, @space_between = operator, expression, space_between
  @type = options[:type] || expression.type
  @predecessors = [expression]
end

Instance Attribute Details

#operator ⇒ Object (readonly)

Returns the value of attribute operator.



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# File 'lib/piglet/field/prefix_expression.rb', line 8

def operator
  @operator
end

Instance Method Details

#simple? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/piglet/field/prefix_expression.rb', line 17

def simple?
  false
end

#to_s(inner = false) ⇒ Object 



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# File 'lib/piglet/field/prefix_expression.rb', line 21

def to_s(inner=false)
  expr = if inner then @expression.field_alias else @expression end
  
  if @space_between
    "#{@operator} #{parenthesise(expr)}"
  else
    "#{@operator}#{parenthesise(expr)}"
  end
end