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module Arel
module Predicates
class Binary < Predicate
def eval(row)
operand1.eval(row).send(operator, operand2.eval(row))
end
end
class Unary < Predicate
def eval(row)
operand.eval(row).send(operator)
end
end
class Not < Unary
def operator; '!' end
end
class CompoundPredicate < Binary
def eval(row)
eval "operand1.eval(row) #{operator} operand2.eval(row)"
end
end
class Or < CompoundPredicate
def operator; :or end
end
class And < CompoundPredicate
def operator; :and end
end
class GroupedPredicate < Polyadic
def eval(row)
group = additional_operands.inject([]) do |results, operand|
results << operator.new(operand1, operand)
end
group.send(compounder) do |operation|
operation.eval(row)
end
end
end
class Any < GroupedPredicate
def compounder; :any? end
end
class All < GroupedPredicate
def compounder; :all? end
end
class Equality < Binary
def operator; :== end
end
class Inequality < Equality
def eval(row)
operand1.eval(row) != operand2.eval(row)
end
end
class GreaterThanOrEqualTo < Binary
def operator; :>= end
end
class GreaterThan < Binary
def operator; :> end
end
class LessThanOrEqualTo < Binary
def operator; :<= end
end
class LessThan < Binary
def operator; :< end
end
class Match < Binary
def operator; :=~ end
end
class NotMatch < Binary
def eval(row)
operand1.eval(row) !~ operand2.eval(row)
end
end
class In < Binary
def eval(row)
operand2.eval(row).include?(operand1.eval(row))
end
end
class NotIn < Binary
def eval(row)
!(operand2.eval(row).include?(operand1.eval(row)))
end
end
end
end
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