Divmod : Nevow : Context Removal

Step 1

Change Resource Inheritance

The Page class is now imported from nevow.page instead of nevow.rend. class declarations change as indicated below.

From:

class Root(rend.Page):
...

To:

class Root(page.Page):
...

Step 2

Change child_ Class Attributes

Class child_* class attributes change in that the prefix is no longer needed and all child_s are stored together in a dict.

From:

...
  child_foo = RendPageInstance
...

To:

...
  children = { 
    'foo': PagePageInstance,
  ...}  
...

Step 3

Remove Context from Signatures

The context object is no longer passed in the method signatures. Passed parameters changes as indicated below.

From:

...
  def render_foo(self, context, data):
  ...

To:

...
  def render_foo(self, request, tag):
  ...

Step 4

Use Decorators

The method names no longer need to contain render_ and child_. Method names change as indicated below.

From:

...
  def render_foo(self, context, data):
  ...
...
  def child_bar(self, context):
  ...

To:

...
  def foo(self, request, tag):
  ...
  page.renderer(foo)
...
  def bar(self, request):
  ...
  page.child(bar)

Or, for a version of python that supports the decorator syntax:

...
  @page.renderer
  def foo(self, request, tag):
  ...
...
  @page.child
  def bar(self, request):
  ...

Step 5

Change Fill Slot Calls

The fillSlots() calls are still tag methods, but tag is now passed directly to render methods and not accessed as a context attribute. Make changes as indicated below.

From:

...
  def render_entries(self, ctx, data):
    ctx.tag.fillSlots('author', 'The Humble Author')
    ctx.tag.fillSlots('title', 'The Excellent Title')
    ctx.tag.fillSlots('content', 'The Interesting Content')
    return ctx.tag

To:

...
  def entries(self, request, tag):
    tag.fillSlots('author', 'The Humble Author')
    tag.fillSlots('title', 'The Excellent Title')
    tag.fillSlots('content', 'The Interesting Content')
    return tag
  page.renderer(entries)