Module: Predicate::Intersect

Includes:
Expr
Defined in:
lib/predicate/nodes/intersect.rb

Constant Summary

Constants included from Expr

Expr::OP_NEGATIONS

Instance Method Summary collapse

Methods included from Expr

#!, #&, #and_split, #attr_split, #constants, #contradiction?, #dyadic_priority, #identifier?, #literal?, #opaque?, #qualify, #rename, #sexpr, #tautology?, #to_s, #to_sequel, #|

Methods included from Factory

#and, #between, #comp, #contradiction, #from_hash, #in, #intersect, #literal, #match, #native, #not, #opaque, #or, #qualified_identifier, #tautology

Instance Method Details

#constant_variables ⇒ Object 



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# File 'lib/predicate/nodes/intersect.rb', line 21

def constant_variables
  values.size == 1 ? free_variables : []
end

#evaluate(tuple) ⇒ Object 



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# File 'lib/predicate/nodes/intersect.rb', line 25

def evaluate(tuple)
  t_x = identifier.evaluate(tuple)
  t_x && !(t_x & values).empty?
end

#free_variables ⇒ Object 



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# File 'lib/predicate/nodes/intersect.rb', line 17

def free_variables
  @free_variables ||= identifier.free_variables
end

#identifier ⇒ Object 



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# File 'lib/predicate/nodes/intersect.rb', line 9

def identifier
  self[1]
end

#priority ⇒ Object 



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# File 'lib/predicate/nodes/intersect.rb', line 5

def priority
  80
end

#values ⇒ Object 



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# File 'lib/predicate/nodes/intersect.rb', line 13

def values
  self[2]
end