add_transcoder: Change parameter order.

This is the first part of making the content type parameter optional

README.rst

@@ -52,8 +52,8 @@ types:
            # insert your handlers here
        ])
 
-       content.add_transcoder(application, 'application/json',
-                              transcoders.JSONTranscoder())
+       content.add_transcoder(application, transcoders.JSONTranscoder(),
+                              'application/json')
 
        return application
 

examples.py

@@ -18,10 +18,10 @@ def make_application(**settings):
     application = web.Application([web.url(r'/', SimpleHandler)], **settings)
     content.set_default_content_type(application, 'application/json',
                                      encoding='utf-8')
-    content.add_transcoder(application, 'application/msgpack',
-                           transcoders.MsgPackTranscoder())
-    content.add_transcoder(application, 'application/json',
-                           transcoders.JSONTranscoder())
+    content.add_transcoder(application, transcoders.MsgPackTranscoder(),
+                           content_type='application/msgpack')
+    content.add_transcoder(application, transcoders.JSONTranscoder(),
+                           content_type='application/json')
     return application
 
 

sprockets/mixins/mediatype/content.py

@@ -131,8 +131,9 @@ def add_binary_content_type(application, content_type, pack, unpack):
         dictionary.  ``unpack(bytes) -> dict``
 
     """
-    add_transcoder(application, content_type,
-                   handlers.BinaryContentHandler(content_type, pack, unpack))
+    add_transcoder(application,
+                   handlers.BinaryContentHandler(content_type, pack, unpack),
+                   content_type)
 
 
 def add_text_content_type(application, content_type, default_encoding,
@@ -155,19 +156,20 @@ def add_text_content_type(application, content_type, default_encoding,
     parsed = headers.parse_content_type(content_type)
     parsed.parameters.pop('charset', None)
     normalized = str(parsed)
-    add_transcoder(application, normalized,
+    add_transcoder(application,
                    handlers.TextContentHandler(normalized, dumps, loads,
-                                               default_encoding))
+                                               default_encoding),
+                   normalized)
 
 
-def add_transcoder(application, content_type, transcoder):
+def add_transcoder(application, transcoder, content_type):
     """
     Register a transcoder for a specific content type.
 
     :param tornado.web.Application application: the application to modify
-    :param str content_type: the content type to add
     :param transcoder: object that translates between :class:`bytes` and
         :class:`object` instances
+    :param str content_type: the content type to add
 
     The `transcoder` instance is required to implement the following
     simple protocol: