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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(strategy = nil)
"#{operand1.to_sql(operand2.strategy)} #{predicate_sql} #{operand2.to_sql(operand1.strategy)}"
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
protected
def predicate_sql
'='
end
end
class GreaterThanOrEqualTo < Binary
protected
def predicate_sql
'>='
end
end
class GreaterThan < Binary
protected
def predicate_sql
'>'
end
end
class LessThanOrEqualTo < Binary
protected
def predicate_sql
'<='
end
end
class LessThan < Binary
protected
def predicate_sql
'<'
end
end
class Match < Binary
alias_method :regexp, :operand2
def initialize(operand1, regexp)
@operand1, @regexp = operand1, regexp
end
end
class RelationInclusion < Binary
alias_method :relation, :operand2
protected
def predicate_sql
'IN'
end
end
end
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