1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/gems/rack-1.1.0/lib/rack/cascade.rb b/vendor/gems/rack-1.1.0/lib/rack/cascade.rb
new file mode 100644
index 000000000..14c3e54d3
--- /dev/null
+++ b/vendor/gems/rack-1.1.0/lib/rack/cascade.rb
@@ -0,0 +1,41 @@
+module Rack
+  # Rack::Cascade tries an request on several apps, and returns the
+  # first response that is not 404 (or in a list of configurable
+  # status codes).
+
+  class Cascade
+    NotFound = [404, {}, []]
+
+    attr_reader :apps
+
+    def initialize(apps, catch=404)
+      @apps = []; @has_app = {}
+      apps.each { |app| add app }
+
+      @catch = {}
+      [*catch].each { |status| @catch[status] = true }
+    end
+
+    def call(env)
+      result = NotFound
+
+      @apps.each do |app|
+        result = app.call(env)
+        break unless @catch.include?(result[0].to_i)
+      end
+
+      result
+    end
+
+    def add app
+      @has_app[app] = true
+      @apps << app
+    end
+
+    def include? app
+      @has_app.include? app
+    end
+
+    alias_method :<<, :add
+  end
+end