this adds a new accept type

This new class handles various accept strings and makes them available
throught the same API. This way, language and media type feels the same.

3 files changed, 80 insertions, 58 deletions

diff --git a/lib/zero/request.rb b/lib/zero/request.rb
index 6b6ff01..9be17e9 100644
--- a/lib/zero/request.rb
+++ b/lib/zero/request.rb
@@ -55,7 +55,7 @@ module Zero
     # get the media types
     # @return [Accept] on Accept object managing all types and their order
     def media_types
-      @accept ||= Request::Accept.new(@env[CONST_HTTP_ACCEPT])
+      @accept ||= Request::Accept.new(@env)
     end
 
     # get the method of the request
diff --git a/lib/zero/request/accept.rb b/lib/zero/request/accept.rb
index 9ab1dfc..0a97a81 100644
--- a/lib/zero/request/accept.rb
+++ b/lib/zero/request/accept.rb
@@ -1,3 +1,5 @@
+require_relative 'accept_type'
+
 module Zero
   class Request
     # encapsulates the accept header to easier work with
@@ -7,6 +9,10 @@ module Zero
       MEDIA_PARAM_SEPERATOR = ';'
       MEDIA_QUALITY_REGEX   = /q=[01]\./
 
+      KEY_HTTP_ACCEPT = 'HTTP_ACCEPT'
+      KEY_HTTP_ACCEPT_LANGUAGE = 'HTTP_ACCEPT_LANGUAGE'
+      KEY_HTTP_ACCEPT_ENCODING = 'HTTP_ACCEPT_ENCODING'
+
       def self.map=(map)
         @@map = map
       end
@@ -16,65 +22,15 @@ module Zero
       end
 
       # create a new accept object
-      def initialize(accept_string)
-        if accept_string.nil?
-          @types = []
-        else
-          @types = parse_media_types(accept_string)
-        end
-      end
-
-      # return the preferred type
-      # @return String the preferred media type
-      def preferred
-        @types.first
-      end
-
-      # iterate over all media types
-      def each
-        @types.each {|type| yield type}
-      end
-
-      private
-
-      # converts the accept string to a useable array
-      # @param accept_string the string containing media ranges and options
-      def parse_media_types(accept_string = '*/*')
-        accept_string.
-          gsub(/\s/, '').
-          split(MEDIA_TYPE_SEPERATOR).
-          map do |accept_range|
-           extract_order(*accept_range.split(MEDIA_PARAM_SEPERATOR))
-          end.
-          sort_by(&:last).
-          map(&:first)
-      end
-
-      # extract the order of the type
-      # @param media_type the type itself
-      # @param params further options to the type
-      # @return Array the media type and quality in that order
-      def extract_order(media_type, *params)
-        params.each do |param|
-          if param.match(MEDIA_QUALITY_REGEX)
-            return [map_type(media_type), 10 - param[4..-1].to_i] 
-          end
-        end
-        [map_type(media_type), 0]
+      def initialize(environment)
+        @accept_types = AcceptType.new(environment[KEY_HTTP_ACCEPT])
+        @accept_language = AcceptType.new(environment[KEY_HTTP_ACCEPT_LANGUAGE])
+        @accept_encoding = AcceptType.new(environment[KEY_HTTP_ACCEPT_ENCODING])
       end
 
-      # map media types to the type given in the map
-      # @param type [String] the media type
-      # @return the media type of the mapping or the original
-      def map_type(type)
-        return map[type] if map.has_key?(type)
-        type
-      end
-
-      # a small wrapper to the class method
-      def map
-        self.class.map
-      end
+      attr_reader :accept_types
+      attr_reader :accept_language
+      attr_reader :accept_encoding
     end
   end
 end
diff --git a/lib/zero/request/accept_type.rb b/lib/zero/request/accept_type.rb
new file mode 100644
index 0000000..db5a000
--- /dev/null
+++ b/lib/zero/request/accept_type.rb
@@ -0,0 +1,66 @@
+module Zero
+  class Request
+    # This class provides an interface to access information of accept schemas.
+    class AcceptType
+      MEDIA_TYPE_SEPERATOR  = ','
+      MEDIA_PARAM_SEPERATOR = ';'
+      MEDIA_QUALITY_REGEX   = /q=[01]\./
+
+        # create a new instance of AcceptType
+      def initialize(string)
+        if string.nil?
+          @elements = []
+        else
+          @elements = parse_elements(string)
+        end
+      end
+
+      # return the preferred type
+      # @return String the preferred media type
+      def preferred
+        @elements.first
+      end
+
+      # iterate over all media types
+      def each
+        @elements.each {|element| yield element}
+      end
+
+      private
+
+      # converts the accept string to a useable array
+      # @param string the string containing media ranges and options
+      def parse_elements(string = '*/*')
+        string.
+          gsub(/\s/, '').
+          split(MEDIA_TYPE_SEPERATOR).
+          map do |accept_range|
+            extract_order(*accept_range.split(MEDIA_PARAM_SEPERATOR))
+          end.
+          sort_by(&:last).
+          map(&:first)
+      end
+
+      # extract the order of the type
+      # @param media_type the type itself
+      # @param params further options to the type
+      # @return Array the media type and quality in that order
+      def extract_order(media_type, *params)
+        params.each do |param|
+          if param.match(MEDIA_QUALITY_REGEX)
+            return [media_type, 10 - param[4..-1].to_i] 
+          end
+        end
+        [media_type, 0]
+      end
+
+      # map media types to the type given in the map
+      # @param type [String] the media type
+      # @return the media type of the mapping or the original
+      def map_type(type)
+        return map[type] if map.has_key?(type)
+        type
+      end
+    end
+  end
+end