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Viewing changes to ivle/webapp/base/xhtml.py

  • Committer: William Grant
  • Date: 2012-06-28 01:52:02 UTC
  • Revision ID: me@williamgrant.id.au-20120628015202-f6ru7o367gt6nvgz
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ivle/webapp/base/xhtml.py
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from ivle.webapp.publisher import NoPath
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from ivle.webapp.breadcrumbs import Breadcrumber
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class XHTMLView(BaseView):
 
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class GenshiLoaderMixin(object):
 
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    """Mixin for classes which need to render Genshi templates.
 
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    A TemplateLoader is shared between all instances, so templates are
 
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    cached across multiple instances and therefore also requests.
 
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    """
 
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    _loader = None
 
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    def __init__(self, *args, **kwargs):
 
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        super(GenshiLoaderMixin, self).__init__(*args, **kwargs)
 
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        # We use a single loader for all views, so we can cache the
 
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        # parsed templates. auto_reload is convenient and has a minimal
 
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        # performance penalty, so we'll leave it on.
 
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        if GenshiLoaderMixin._loader is None:
 
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            GenshiLoaderMixin._loader = genshi.template.TemplateLoader(
 
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                ".", auto_reload=True,
 
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                max_cache_size=100)
 
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class XHTMLView(GenshiLoaderMixin, BaseView):
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    """
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    A view which provides a base class for views which need to return XHTML
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    It is expected that apps which use this view will be written using Genshi
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        # view.
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        app_template = os.path.join(os.path.dirname(
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                        inspect.getmodule(self).__file__), self.template) 
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        loader = genshi.template.TemplateLoader(".", auto_reload=True)
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        tmpl = loader.load(app_template)
 
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        tmpl = self._loader.load(app_template)
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        app = self.filter(tmpl.generate(viewctx), viewctx)
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        view_scripts = []
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        crumber = Breadcrumber(req)
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        ctx['breadcrumbs'] = []
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        for ancestor in ancestry:
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            crumb = crumber.crumb(ancestor)
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            if crumb is None:
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                continue
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            if hasattr(crumb, 'extra_breadcrumbs_before'):
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                ctx['breadcrumbs'].extend(crumb.extra_breadcrumbs_before)
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            ctx['breadcrumbs'].append(crumb)
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            if hasattr(crumb, 'extra_breadcrumbs_after'):
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                ctx['breadcrumbs'].extend(crumb.extra_breadcrumbs_after)
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        # If the view has specified text for a breadcrumb, add one.
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        if self.breadcrumb_text:
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            ctx['breadcrumbs'].append(ViewBreadcrumb(req, self))
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        # Allow the view to add its own fake breadcrumbs.
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        ctx['breadcrumbs'].extend(self.extra_breadcrumbs)
 
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        if not req.publicmode:
 
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            for ancestor in ancestry:
 
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                crumb = crumber.crumb(ancestor)
 
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                if crumb is None:
 
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                    continue
 
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                if hasattr(crumb, 'extra_breadcrumbs_before'):
 
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                    ctx['breadcrumbs'].extend(crumb.extra_breadcrumbs_before)
 
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                ctx['breadcrumbs'].append(crumb)
 
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                if hasattr(crumb, 'extra_breadcrumbs_after'):
 
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                    ctx['breadcrumbs'].extend(crumb.extra_breadcrumbs_after)
 
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            # If the view has specified text for a breadcrumb, add one.
 
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            if self.breadcrumb_text:
 
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                ctx['breadcrumbs'].append(ViewBreadcrumb(req, self))
 
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            # Allow the view to add its own fake breadcrumbs.
 
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            ctx['breadcrumbs'].extend(self.extra_breadcrumbs)
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        self.populate_headings(req, ctx)
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        tmpl = loader.load(os.path.join(os.path.dirname(__file__), 
 
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        tmpl = self._loader.load(os.path.join(os.path.dirname(__file__), 
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                                                        'ivle-headings.html'))
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        req.write(tmpl.generate(ctx).render('xhtml', doctype='xhtml'))
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    def populate(self, req, ctx):
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        ctx['req'] = req
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        ctx['exception'] = self.context
 
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        req.headers_out['X-IVLE-Error'] = self.context.message
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class XHTMLUnauthorizedView(XHTMLErrorView):
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    template = 'xhtmlunauthorized.html'