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# Copyright (c) 2010 Mark Sandstrom
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from declarations import OrderedDeclaration, SubFactory
ATTR_SPLITTER = '__'
class ObjectParamsWrapper(object):
"""A generic container that allows for getting but not setting of attributes.
Attributes are set at initialization time."""
initialized = False
def __init__(self, attrs):
self.attrs = attrs
self.initialized = True
def __setattr__(self, name, value):
if not self.initialized:
return super(ObjectParamsWrapper, self).__setattr__(name, value)
else:
raise AttributeError('Setting of object attributes is not allowed')
def __getattr__(self, name):
try:
return self.attrs[name]
except KeyError:
raise AttributeError("The param '{0}' does not exist. Perhaps your declarations are out of order?".format(name))
class OrderedDict(object):
def __init__(self, **kwargs):
self._order = {}
self._values = {}
for k, v in kwargs.iteritems():
self[k] = v
def __contains__(self, key):
return key in self._values
def __getitem__(self, key):
return self._values[key]
def __setitem__(self, key, val):
if key in self:
del self[key]
self._values[key] = val
self._order[val.order] = key
def __delitem__(self, key):
self.pop(key)
def pop(self, key):
val = self._values.pop(key)
del self._order[val.order]
return val
def items(self):
return list(self.iteritems())
def iteritems(self):
order = sorted(self._order.keys())
for i in order:
key = self._order[i]
yield (key, self._values[key])
def __iter__(self):
order = sorted(self._order.keys())
for i in order:
yield self._order[i]
class DeclarationDict(object):
"""Holds a dict of declarations, keeping OrderedDeclaration at the end."""
def __init__(self, extra=None):
if not extra:
extra = {}
self._ordered = OrderedDict()
self._unordered = {}
self.update(extra)
def __setitem__(self, key, value):
if key in self:
del self[key]
if isinstance(value, OrderedDeclaration):
self._ordered[key] = value
else:
self._unordered[key] = value
def __getitem__(self, key):
"""Try in _unordered first, then in _ordered."""
try:
return self._unordered[key]
except KeyError:
return self._ordered[key]
def __delitem__(self, key):
if key in self._unordered:
del self._unordered[key]
else:
del self._ordered[key]
def pop(self, key, *args):
assert len(args) <= 1
try:
return self._unordered.pop(key)
except KeyError:
return self._ordered.pop(key, *args)
def update(self, d):
for k in d:
self[k] = d[k]
def update_with_public(self, d):
"""Updates the DeclarationDict from a class definition dict.
Takes into account all public attributes and OrderedDeclaration
instances; ignores all attributes starting with '_'.
Returns a dict containing all remaining elements.
"""
remaining = {}
for k, v in d.iteritems():
if k.startswith('_') and not isinstance(v, OrderedDeclaration):
remaining[k] = v
else:
self[k] = v
return remaining
def copy(self, extra=None):
new = DeclarationDict()
new.update(self)
if extra:
new.update(extra)
return new
def __contains__(self, key):
return key in self._unordered or key in self._ordered
def items(self):
return list(self.iteritems())
def iteritems(self):
for pair in self._unordered.iteritems():
yield pair
for pair in self._ordered.iteritems():
yield pair
def __iter__(self):
for k in self._unordered:
yield k
for k in self._ordered:
yield k
class AttributeBuilder(object):
"""Builds attributes from a factory and extra data."""
def __init__(self, factory, extra=None):
if not extra:
extra = {}
self.factory = factory
self._attrs = factory.declarations(extra)
self._subfield = self._extract_subfields()
def _extract_subfields(self):
sub_fields = {}
for key in list(self._attrs):
if ATTR_SPLITTER in key:
cls_name, attr_name = key.split(ATTR_SPLITTER, 1)
if cls_name in self._attrs:
sub_fields.setdefault(cls_name, {})[attr_name] = self._attrs.pop(key)
return sub_fields
def build(self, create):
self.factory.sequence = self.factory._generate_next_sequence()
attributes = {}
for key, val in self._attrs.iteritems():
if isinstance(val, SubFactory):
val = val.evaluate(self.factory, create, self._subfield.get(key, {}))
elif isinstance(val, OrderedDeclaration):
wrapper = ObjectParamsWrapper(attributes)
val = val.evaluate(self.factory, wrapper)
attributes[key] = val
return attributes
class StubObject(object):
"""A generic container."""
pass
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