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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 OrderedDeclarationDict(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 DeclarationsHolder(object):
"""Holds all declarations, ordered and unordered."""
def __init__(self, defaults=None):
if not defaults:
defaults = {}
self._ordered = OrderedDeclarationDict()
self._unordered = {}
self.update_base(defaults)
def update_base(self, attrs):
"""Updates the DeclarationsHolder from a class definition.
Takes into account all public attributes and OrderedDeclaration
instances; ignores all attributes starting with '_'.
Returns a dict containing all remaining elements.
"""
remaining = {}
for key, value in attrs.iteritems():
if isinstance(value, OrderedDeclaration):
self._ordered[key] = value
elif not key.startswith('_'):
self._unordered[key] = value
else:
remaining[key] = value
return remaining
def __contains__(self, key):
return key in self._ordered or key in self._unordered
def __getitem__(self, key):
try:
return self._unordered[key]
except KeyError:
return self._ordered[key]
def iteritems(self):
for pair in self._unordered.iteritems():
yield pair
for pair in self._ordered.iteritems():
yield pair
def items(self):
return list(self.iteritems())
def _extract_sub_fields(self, base):
"""Extract all subfields declaration from a given dict-like object.
Will compare with attributes declared in the current object, and
will pop() values from the given base.
"""
sub_fields = dict()
for key in list(base):
if ATTR_SPLITTER in key:
cls_name, attr_name = key.split(ATTR_SPLITTER, 1)
if cls_name in self:
sub_fields.setdefault(cls_name, {})[attr_name] = base.pop(key)
return sub_fields
def build_attributes(self, factory, create=False, extra=None):
"""Build the list of attributes based on class attributes."""
if not extra:
extra = {}
factory.sequence = factory._generate_next_sequence()
attributes = {}
sub_fields = {}
for base in (self._unordered, self._ordered, extra):
sub_fields.update(self._extract_sub_fields(base))
def make_value(key, val):
if key in extra:
val = extra.pop(key)
if isinstance(val, SubFactory):
new_val = val.evaluate(factory, create, sub_fields.get(key, {}))
elif isinstance(val, OrderedDeclaration):
wrapper = ObjectParamsWrapper(attributes)
new_val = val.evaluate(factory, wrapper)
else:
new_val = val
return new_val
# For fields in _unordered, use the value from extra if any; otherwise,
# use the default value.
for key, value in self._unordered.iteritems():
attributes[key] = make_value(key, value)
for key, value in self._ordered.iteritems():
attributes[key] = make_value(key, value)
attributes.update(extra)
return attributes
class StubObject(object):
"""A generic container."""
pass
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