From cc67272cba35e50afa73cfec856c1677b204ae7e Mon Sep 17 00:00:00 2001
From: Joshua Peek <josh@joshpeek.com>
Date: Sat, 22 Nov 2008 14:33:00 -0600
Subject: Vendor rack 0.4.0

---
 .../vendor/rack-0.4.0/rack/builder.rb              | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 actionpack/lib/action_controller/vendor/rack-0.4.0/rack/builder.rb

(limited to 'actionpack/lib/action_controller/vendor/rack-0.4.0/rack/builder.rb')

diff --git a/actionpack/lib/action_controller/vendor/rack-0.4.0/rack/builder.rb b/actionpack/lib/action_controller/vendor/rack-0.4.0/rack/builder.rb
new file mode 100644
index 0000000000..e708b52aee
--- /dev/null
+++ b/actionpack/lib/action_controller/vendor/rack-0.4.0/rack/builder.rb
@@ -0,0 +1,56 @@
+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
+  #  }
+  #
+  # +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 use(middleware, *args, &block)
+      @ins << if block_given?
+        lambda { |app| middleware.new(app, *args, &block) }
+      else
+        lambda { |app| middleware.new(app, *args) }
+      end
+    end
+
+    def run(app)
+      @ins << app #lambda { |nothing| app }
+    end
+
+    def map(path, &block)
+      if @ins.last.kind_of? Hash
+        @ins.last[path] = Rack::Builder.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
-- 
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