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module Bundler::PubGrub
class Term
attr_reader :package, :constraint, :positive
def initialize(constraint, positive)
@constraint = constraint
@package = @constraint.package
@positive = positive
end
def to_s(allow_every: false)
if positive
@constraint.to_s(allow_every: allow_every)
else
"not #{@constraint}"
end
end
def hash
constraint.hash ^ positive.hash
end
def eql?(other)
positive == other.positive &&
constraint.eql?(other.constraint)
end
def invert
self.class.new(@constraint, !@positive)
end
alias_method :inverse, :invert
def intersect(other)
raise ArgumentError, "packages must match" if package != other.package
if positive? && other.positive?
self.class.new(constraint.intersect(other.constraint), true)
elsif negative? && other.negative?
self.class.new(constraint.union(other.constraint), false)
else
positive = positive? ? self : other
negative = negative? ? self : other
self.class.new(positive.constraint.intersect(negative.constraint.invert), true)
end
end
def difference(other)
intersect(other.invert)
end
def relation(other)
if positive? && other.positive?
constraint.relation(other.constraint)
elsif negative? && other.positive?
if constraint.allows_all?(other.constraint)
:disjoint
else
:overlap
end
elsif positive? && other.negative?
if !other.constraint.allows_any?(constraint)
:subset
elsif other.constraint.allows_all?(constraint)
:disjoint
else
:overlap
end
elsif negative? && other.negative?
if constraint.allows_all?(other.constraint)
:subset
else
:overlap
end
else
raise
end
end
def normalized_constraint
@normalized_constraint ||= positive ? constraint : constraint.invert
end
def satisfies?(other)
raise ArgumentError, "packages must match" unless package == other.package
relation(other) == :subset
end
def positive?
@positive
end
def negative?
!positive?
end
def empty?
@empty ||= normalized_constraint.empty?
end
def inspect
"#<#{self.class} #{self}>"
end
end
end
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