class ConverterRegistry(object):
"""A registry for converters.
Used to decode/encode URL parameters and path variables used
by the :meth:`morepath.AppBase.path` directive.
Is aware of inheritance.
"""
def __init__(self):
self._map = Map()
def register_converter(self, type, converter):
"""Register a converter for type.
:param type: the Python type for which to register
the converter.
:param converter: a :class:`morepath.Converter` instance.
"""
self._map[ClassMapKey(type)] = converter
def converter_for_type(self, type):
"""Get converter for type.
Is aware of inheritance; if nothing is registered for given
type will return converter registered for base class.
:param type: The type for which to look up the converter.
:returns: a :class:`morepath.Converter` instance.
"""
return self._map.get(ClassMapKey(type))
def converter_for_value(self, v):
"""Get converter for value.
Is aware of inheritance; if nothing is registered for type of
given value will return converter registered for base class.
:param value: The value for which to look up the converter.
:returns: a :class:`morepath.Converter` instance.
"""
if v is None:
return IDENTITY_CONVERTER
return self.converter_for_type(type(v))
class ConverterRegistry(object):
"""A registry for converters.
Used to decode/encode URL parameters and path variables used
by the :meth:`morepath.App.path` directive.
Is aware of inheritance.
"""
def __init__(self):
self._map = Map()
def clear(self):
self._map = Map()
def register_converter(self, type, converter):
"""Register a converter for type.
:param type: the Python type for which to register
the converter.
:param converter: a :class:`morepath.Converter` instance.
"""
self._map[ClassMapKey(type)] = converter
def converter_for_type(self, type):
"""Get converter for type.
Is aware of inheritance; if nothing is registered for given
type it returns the converter registered for its base class.
:param type: The type for which to look up the converter.
:returns: a :class:`morepath.Converter` instance.
"""
result = self._map.get(ClassMapKey(type))
if result is None:
raise DirectiveError(
"Cannot find converter for type: %r" % type)
return result
def converter_for_value(self, v):
"""Get converter for value.
Is aware of inheritance; if nothing is registered for type of
given value it returns the converter registered for its base class.
:param value: The value for which to look up the converter.
:returns: a :class:`morepath.Converter` instance.
"""
if v is None:
return IDENTITY_CONVERTER
try:
return self.converter_for_type(type(v))
except DirectiveError:
raise DirectiveError(
"Cannot find converter for default value: %r (%s)" %
(v, type(v)))
def converter_for_explicit_or_type(self, c):
"""Given a converter or a type, turn it into an explicit one.
"""
if type(c) in [type, ClassType]:
return self.converter_for_type(c)
return c
def converter_for_explicit_or_type_or_list(self, c):
"""Given a converter or type or list, turn it into an explicit one.
:param c: can either be a converter, or a type for which
a converter can be looked up, or a list with a converter or a type
in it.
:returns: a :class:`Converter` instance.
"""
if isinstance(c, list):
if len(c) == 0:
c = IDENTITY_CONVERTER
else:
c = self.converter_for_explicit_or_type(c[0])
return ListConverter(c)
return self.converter_for_explicit_or_type(c)
def explicit_converters(self, converters):
"""Given converter dictionary, make everything in it explicit.
This means types have converters looked up for them, and
lists are turned into :class:`ListConverter`.
"""
return {name: self.converter_for_explicit_or_type_or_list(value) for
name, value in converters.items()}
def argument_and_explicit_converters(self, arguments, converters):
"""Use explict converters unless none supplied, then use default args.
"""
result = self.explicit_converters(converters)
for name, value in arguments.items():
if name not in result:
result[name] = self.converter_for_value(value)
return result
def test_map_get_default():
m = Map()
a = MapKey('a')
assert m.get(a, 'default') == 'default'
def test_map_get():
m = Map()
a = MapKey('a')
m[a] = u'Value for A'
assert m.get(a) == u'Value for A'
def test_map_get_default():
m = Map()
a = MapKey('a')
assert m.get(a, 'default') == 'default'
def test_map_get():
m = Map()
a = MapKey('a')
m[a] = u'Value for A'
assert m.get(a) == u'Value for A'
