1 files changed, 105 insertions, 0 deletions
diff --git a/lib/bundler/vendor/pub_grub/lib/pub_grub/term.rb b/lib/bundler/vendor/pub_grub/lib/pub_grub/term.rb
new file mode 100644
index 0000000000..1d0f763378
--- /dev/null
+++ b/lib/bundler/vendor/pub_grub/lib/pub_grub/term.rb
@@ -0,0 +1,105 @@
+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