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require 'pp' class Coset @@routes = [] unless defined? @@routes def call(env) path = env["PATH_INFO"] path = "/" if path.empty? @res = Rack::Response.new @req = Rack::Request.new(env) run path, env["REQUEST_METHOD"] @res.finish end def run(path, everb=//) @@routes.each { |rx, verb, fields, meth| if path =~ rx && everb === verb fields.each_with_index { |field, index| instance_variable_set "@#{field}", $~[index+1] } return __send__(meth) end } res.status = 404 req.env["rack.showstatus.detail"] = "<h2>Routes:</h2><pre><code>#{Rack::Utils.escape_html PP.pp(@@routes, '')}</code></pre>" end attr_reader :res, :req class << self def call(env) new.call(env) end def define(desc, &block) meth = method_name desc verb, fields, rx = *tokenize(desc) @@routes << [rx, verb, fields, meth] define_method(meth, &block) end def GET(desc, &block) define("GET #{desc}", &block) end def POST(desc, &block) define("POST #{desc}", &block) end def PUT(desc, &block) define("PUT #{desc}", &block) end def DELETE(desc, &block) define("DELETE #{desc}", &block) end def tokenize(desc) verb, path = desc.split(" ", 2) if verb.nil? || path.nil? raise ArgumentError, "Invalid description string #{desc}" end verb.upcase! fields = [] rx = Regexp.new "\\A" + path.gsub(/\{(.*?)(:.*?)?\}/) { fields << $1 case $2 when "numeric" "(\d+)" when "all" "(.*?)" when "", nil "([^/]*?)" else raise ArgumentError, "Invalid qualifier #$2 for #$1" end } + "\\z" [verb, fields, rx] end def method_name(desc) desc.gsub(/\{(.*?)\}/) { $1.upcase }.delete(" ").gsub(/[^\w-]/, '_') end end end

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