ANN: Nevow 0.3 released
Valentino Volonghi aka Dialtone
dialton3#NOSPAM.JJJJKIKK at virgilio.it
Mon Sep 27 18:17:05 CEST 2004
GET it here: http://www.nevow.com/releases/0.3.0/nevow-0.3.tar.gz
Nevow (pronounced nou-veau) is a web application construction kit written
in Python. It is designed to allow the programmer to express as much of
the view logic as desired in Python, and includes a pure Python XML
expression syntax named stan to facilitate this. However it also provides
rich support for designer-edited templates, using a very small XML
attribute language to provide bi-directional template manipulation
Nevow also includes formless, a declarative syntax for specifying the
types of method parameters and exposing these methods to the web. Forms
can be rendered automatically, and form posts will be validated and input
coerced, rendering error pages if appropriate. Once a form post has
validated successfully, the method will be called with the coerced values.
a browser and Python on the server. For 0.3, LivePage has been updated to
operate on Mozilla, Firefox, Windows Internet Explorer 6, and Safari on
implementation details are hidden from the programmer, with Nevow taking
care of routing data to and from the server using XmlHttpRequest.
* XHTML templates: contain no programming logic, only nodes tagged
with nevow attributes
* data/render methods: simplify the task of separating data from
presentation and writing view logic
* stan: An s-expression-like syntax for expressing xml in pure python
* formless: For describing the types of objects which may be passed to
methods of your classes, validating and coercing string input from
either web or command-line sources, and calling your methods
automatically once validation passes
* webform: For rendering web forms based on formless type
descriptions, accepting form posts and passing them to formless
validators, and rendering error forms in the event validation fails
events to the server and server side events to the client after the
page has loaded, without causing the entire page to refresh
Bug Tracker: http://divmod.org/users/roundup.twistd/nevow/
What's New in Nevow 0.3:
2004-09-26 Donovan Preston <dp at divmod.org>
* Added nevow.inevow.IQ interface, an interface for querying the
stan DOM. Eventually, this interface will contain APIs for doing
traditional DOM introspection, such as iterating children,
examining tag names, and examining attributes. For now, it contains
only the patternGenerator, onePattern, and allPatterns APIs. These
APIs have been deprecated from Context.
The main benefit of this is the ability to do:
which would be nice for creating "pattern library" files containing
common skin idioms which can then be copied and used throughout
2004-09-25 Donovan Preston <dp at divmod.org>
* Chatola received a major facelift, bringing it from cool demo
up to almost a full fledged web-based chat server. The helper API
LiveEvil.call(...) was added, which deprecates
2004-09-23 Tommi Virtanen <tv at twistedmatrix.com>
* Make guard.SessionWrapper store its URL location in all requests it
passes to its children. This allows the children know where to post
the __login__ and __logout__ forms, even deep inside the resource
tree (fixes issue59).
* Guard now works as a non-root resource, with help from the above
change. Semantics of __login__ clarified in unit tests; if your guard
is at /foo, posting to /foo/__login__ redirects to /foo, and posting
to /foo/__login__/ redirects to /foo/. The two unit tests that failed
earlier now pass (with that change in their __login__ URLs).
* If URL-based sessions are used, login no longer loses session
information due to redirect to / (fixes issue56).
2004-09-20 Matt Goodall <matt at pollenation.net>
* Added URL.secure() method to make switching between http and
2004-09-08 Donovan Preston <dp at divmod.org>
* Nevow now includes a very simple proof-of-concept WSGI Application
implementation, and can be used with no Twisted dependency. Nevow can
also be used to write CGIs, either using a simple CGI WSGI gateway
(which supports URL traversal), or by using Page.renderString (which does not).
* Two new context interfaces, ICurrentSegments and IRemainingSegments,
replace the need to examine the Request prepath and postpath attributes
* ISerializable is deprecated, and has been replaced with a simple
Flattener registry. nevow.flat.registerFlattener and
nevow.flat.getFlattener have been added to support this.
2004-09-06 Donovan Preston <dp at divmod.org>
* BACKWARDS INCOMPATIBLE CHANGE. Page.configurable_ *always* returns
self, and a new Page.configurable_original *always* returns
self.original. If you were relying on Page.configurable_'s
introspection behavior and are now getting errors about adapting
to IConfigurable, change your renderForms() calls to:
This causes Page.configurable_original to be invoked and
introspected for form rendering.
2004-08-23 Donovan Preston <dp at divmod.org>
* LivePage uses a simpler implementation strategy which requires
the browser to make one request per output event. As a result,
LivePage now works on Mozilla, Safari, and Internet Explorer Windows.
2004-08-05 Donovan Preston <dp at divmod.org>
* Implemented support for IFoo(ctx) synonym syntax. It does the
same thing as ctx.locate(IFoo)
* Removed Resource Generators, a feature of NevowSite that nobody
used and wasn't really useful.
* Changed all inevow.IResource apis to take a Context object
where they used to take the request. Remembering objects in
PageContexts is now much easier, and fewer hacks are required to
build the context chain. The context chain now looks like:
2004-7-28 Donovan Preston <dp at divmod.org>
* Parameterize data_* methods in the same way as render_* methods.
Patch by k3mper.
For example, <div nevow:data="foo bar,baz" /> will cause
data_foo(self, bar, baz) to be called with the strings "bar" and
"baz". This data method should return a callable taking ctx, data.
The return value of this callable will be remembered as IData at
this point in the context stack.
* Added list-slicing support to ListContainer. You may now use
list slicing syntax in a data directive in addition to a simple
index. For example:
def data_aList(self, ctx, data):
return ["Buckle", "My", "Shoe"]
<span nevow:data="1:-1" nevow:render="string" />
Will render as <div><span>My</span></div>
2004-7-20 Matt Goodall <matt at pollenation.net>
* Modified sax loader to retain doctypes, comments and xmlns attributes.
It's now possible to build XHTML valid pages :).
xmlns attributes are always kept but there are options to ignore the doctype
and comment (at the request of foom, not sure why yet). Right now, the default
is to retain doctypes and comments but you can use the ignoreDocType and
ignoreComment args to the xml loaders and flatsax parse functions. This bit
* Add a URL -> IResource adapter that performs a HTTP redirect. URLs can then
be returned from locateChild().
2004-06-07 Donovan Preston <dp at divmod.org>
* Added nevow.canvas, an experimental module similar to LivePage
which provides a Python server-side API for drawing arbitrary lines,
curves, and text in the browser. The implementation is socket-based
and asynchronous, so the server can issue drawing commands to the
client at any time.
The idea is to provide a server-side API to the Python programmer
and shield them from implementation details, but the current
implementation uses a pre-compiled Flash movie (which never changes;
we are not generating Flash bytecodes). An implementation using SVG
or Safari's Canvas (nevow.canvas was written before the Safari Canvas
announcement) would be possible.
2004-05-26 Donovan Preston <dp at divmod.org>
* Add URLOverlay.keep, an API which lets you specify which query args
will be carried on from the current page render into the new URL.
2004-05-24 Matt Goodall <matt at pollenation.net>
* Extracted Fragment from Page. Hopefully, it will make it more obvious
that embedding an object with data_ and render_ methods in a stan tree is
possible without using something as "heavy" as Page which is really meant
to be a web resource.
2004-05-23 Donovan Preston <dp at divmod.org>
* Added some useful APIs to LiveEvil for manipulating the client-side
- flt(stan): Flatten some stan, quoting apostrophes as
- set(what, to): Set the contents of the client-side node
with the id 'what' to the stan 'to'.
- append(where, what): Append the stan 'what' to the client-
side node with the id 'where'
- alert(what): Show an alert to the user with the text "what"
Valentino Volonghi aka Dialtone
Linux User #310274, Proud Gentoo User
Home Page: http://xoomer.virgilio.it/dialtone/
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