Merged updates from trunk into stable branch

[feedcatcher.git] / vendor / rails / actionpack / lib / action_controller / vendor / rack-1.0 / rack / builder.rb

diff --git a/vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/builder.rb b/vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/builder.rb
new file mode 100644 (file)
index 0000000..295235e
--- /dev/null
+++ b/vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/builder.rb
@@ -0,0 +1,63 @@
+module Rack
+  # Rack::Builder implements a small DSL to iteratively construct Rack
+  # applications.
+  #
+  # Example:
+  #
+  #  app = Rack::Builder.new {
+  #    use Rack::CommonLogger
+  #    use Rack::ShowExceptions
+  #    map "/lobster" do
+  #      use Rack::Lint
+  #      run Rack::Lobster.new
+  #    end
+  #  }
+  #
+  # Or
+  #
+  #  app = Rack::Builder.app do
+  #    use Rack::CommonLogger
+  #    lambda { |env| [200, {'Content-Type' => 'text/plain'}, 'OK'] }
+  #  end
+  #
+  # +use+ adds a middleware to the stack, +run+ dispatches to an application.
+  # You can use +map+ to construct a Rack::URLMap in a convenient way.
+
+  class Builder
+    def initialize(&block)
+      @ins = []
+      instance_eval(&block) if block_given?
+    end
+
+    def self.app(&block)
+      self.new(&block).to_app
+    end
+
+    def use(middleware, *args, &block)
+      @ins << lambda { |app| middleware.new(app, *args, &block) }
+    end
+
+    def run(app)
+      @ins << app #lambda { |nothing| app }
+    end
+
+    def map(path, &block)
+      if @ins.last.kind_of? Hash
+        @ins.last[path] = self.class.new(&block).to_app
+      else
+        @ins << {}
+        map(path, &block)
+      end
+    end
+
+    def to_app
+      @ins[-1] = Rack::URLMap.new(@ins.last)  if Hash === @ins.last
+      inner_app = @ins.last
+      @ins[0...-1].reverse.inject(inner_app) { |a, e| e.call(a) }
+    end
+
+    def call(env)
+      to_app.call(env)
+    end
+  end
+end