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module ActiveRelation
class Predicate
def ==(other)
self.class == other.class
end
end
class Binary < Predicate
attr_reader :operand1, :operand2
def initialize(operand1, operand2)
@operand1, @operand2 = operand1, operand2
end
def ==(other)
super and @operand1 == other.operand1 and @operand2 == other.operand2
end
def bind(relation)
descend { |x| x.bind(relation) }
end
def qualify
descend(&:qualify)
end
def to_sql(formatter = nil)
"#{operand2.format(operand1)} #{predicate_sql} #{operand1.format(operand2)}"
end
def descend
self.class.new(yield(operand1), yield(operand2))
end
end
class Equality < Binary
def ==(other)
self.class == other.class and
((operand1 == other.operand1 and operand2 == other.operand2) or
(operand1 == other.operand2 and operand2 == other.operand1))
end
def predicate_sql
'='
end
end
class GreaterThanOrEqualTo < Binary
def predicate_sql
'>='
end
end
class GreaterThan < Binary
def predicate_sql
'>'
end
end
class LessThanOrEqualTo < Binary
def predicate_sql
'<='
end
end
class LessThan < Binary
def predicate_sql
'<'
end
end
class Match < Binary
alias_method :regexp, :operand2
end
class In < Binary
delegate :predicate_sql, :to => :operand2
end
end
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