µWeb

The following input and template trigger an error and a reset connection,
template:

{{ if isinstance([field], [fieldtypes:decimal] }}
test
{{ endif }}

with a call to the templateparser of:

self.parser.Parse('template',
  field=10,
  fieldtypes={'X':'Y'})

I would expect the keyerror in the eval to trigger a keyerror in the uweb stack, and return at least a debug page.

The log says:

Traceback (most recent call last):
  File "/home/janklopper/uweb/__init__.py", line 125, in RequestHandler
    response = getattr(pages, method)(*args)
  File "/home/janklopper/uweb/pagemaker/admin.py", line 61, in _Admin
    fieldtypes=FIELDTYPES))
  File "/home/janklopper/uweb/templateparser.py", line 324, in Parse
    return SafeString(''.join(tag.Parse(**kwds) for tag in self))
  File "/home/janklopper/uweb/templateparser.py", line 324, in <genexpr>
    return SafeString(''.join(tag.Parse(**kwds) for tag in self))
  File "/home/janklopper/uweb/templateparser.py", line 554, in Parse
    output.append(''.join(tag.Parse(**replacements) for tag in self))
  File "/home/janklopper/uweb/templateparser.py", line 554, in <genexpr>
    output.append(''.join(tag.Parse(**replacements) for tag in self))
  File "/home/janklopper/uweb/templateparser.py", line 493, in Parse
    if self.Expression(expr, **kwds):
  File "/home/janklopper/uweb/templateparser.py", line 474, in Expression
    return eval(''.join(nodes), None, local_vars)
  File "<string>", line 1, in <module>
  File "/home/janklopper/uweb/templateparser.py", line 59, in __getitem__
    return self._tags[key].GetValue(self._values)
  File "/home/janklopper/uweb/templateparser.py", line 627, in GetValue
    value = self._GetIndex(value, index)
  File "/home/janklopper/uweb/templateparser.py", line 716, in _GetIndex
    raise TemplateKeyError('Item has no index, key or attribute %r.' % needle)
TemplateKeyError: Item has no index, key or attribute 'decimal'.