[Twisted-web] Standard sequence renderer "loosing" tags?

[A. Goryunov]

Nevermind that - I figured out that the sequence renderer only returns 
those tags that have either "pattern" or "render" specials, so it  seems 
to randomly loose stuff.

A. Goryunov wrote:
> I've noticed that Page.renderString() "swallows" some of the stan 
> nodes. I've also tried the example below in an actual Twisted service 
> and got the same result. Doing it with an XML template also yields 
> erroneous output. Namely, it looses "table", "tr", a couple of "td" 
> tags were MIA too I believe, as well as two "input"s.
>
> The code I was using for testing is attached. It's supposed to be a 
> library of widgets that are constructed using Fragments and 
> render_sequence.
>
> ------------------------------------------------------------------------
>
> from nevow import tags as T
> from nevow import flat, rend, loaders
>
>
>
>
> class TestPage(rend.Page):
>     docFactory = loaders.stan(
>         T.html[
>             T.body[
>                 T.invisible(render=T.directive("widget"))[
>                     T.invisible(pattern="widget_name")['PortalContent'],
>                     T.invisible(pattern="widget_slot")['main_content'],
>                     T.invisible(pattern="widget_slot")[
>                         T.invisible(render=T.directive("widget"))[
>                             T.invisible(pattern="widget_name")['PortalBarVert'],
>                             T.invisible(pattern="widget_slot")[
>                                 T.invisible(render=T.directive("widget"))[
>                                     T.invisible(pattern="widget_name")['LoginForm'],
>                                     T.invisible(pattern="widget_slot")['Sign in'],
>                                     T.invisible(pattern="widget_slot")['User: '],
>                                     T.invisible(pattern="widget_slot")['Password: '],
>                                     T.invisible(pattern="widget_slot")[T.input(type="submit", name="null", value="Submit")]
>                                 ]
>                             ]
>                         ]
>                     ]
>                 ]
>             ]])
>
>     def render_widget(self,ctx,data):
>         wName = ctx.tag.onePattern("widget_name").children[0].strip('\n\t ')
>         attrs = ctx.tag.allPatterns("widget_slot")
>         args = []
>         for attr in attrs:
>             args.append(T.xml(attr.children))
>         try:
>             wdgt = globals()[wName](args)
>             return ctx.tag[wdgt]
>         except IndexError:
>             return ctx.tag[T.p(style="font-color : red")["Unknown widget name: %s" % wName]]
>         
>         
> class LoginForm(rend.Fragment):
>     docFactory = loaders.stan(
>         T.div(class_="login-form", render=T.directive("sequence"))[
>             T.p(class_="small-form-title", pattern="item", render=T.directive('arg')),
>             T.form(action="_submit", method="post")[
>                 T.table(id="login-form-table")[
>                     T.tr[
>                         T.td(align="right")[
>                             T.label(for_="user", pattern="item", render=T.directive('arg'))
>                             ],
>                         T.td(align="left")[
>                             T.input(type="text", name="user",
>                                     class_="login-input")
>                             ]
>                         ],
>                     T.tr[
>                         T.td(align="right")[
>                             T.label(for_="pass", pattern="item", render=T.directive('arg'))
>                             ],
>                         T.td(align="left")[
>                             T.input(type="password", name="pass",
>                                     class_="login-input")
>                             ]
>                         ],
>                     T.tr[T.td(colspan="2")],
>                     T.tr[
>                         T.td(colspan="2", align="center", pattern="item", render=T.directive('arg'))
>                         ]
>                     ]
>                 ]
>             ])
>
>     def render_arg(self,ctx,data):
>         return ctx.tag[data]
>
> class PortalContent(rend.Fragment):
>     docFactory = loaders.stan(
>         T.table(id="portal-content", render=T.directive("sequence"))[
>             T.tr[
>                 T.td(class_="portal-content-main", pattern='item', render=T.directive('arg')),
>                 T.td(class_="portal-content-sidebar", id="portal-sidebar-right",
>                      pattern="item", render=T.directive("arg"))
>                 ]
>             ])
>
>     def render_arg(self,ctx,data):
>         return ctx.tag[data]
>     
> class PortalBarVert(rend.Fragment):
>     docFactory = loaders.stan(
>         T.table(class_="portal-bar-vertical", render=T.directive('sequence'))[
>             T.tr(pattern='item', render=T.directive('arg'))
>             ])
>
>     def render_arg(self,ctx,data):
>         return ctx.tag[T.td(class_='vert-sidebar-slot')[data]]
>
>
>
> page = TestPage()
> df = page.renderString()
> def printPage(result):
>     print result
>
> def printErr(err):
>     print err
> df.addCallback(printPage)
> df.addErrback(printErr)
>   
> ------------------------------------------------------------------------
>
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