"""Views of core data structures such as nested Mappings (e.g. dict-of-dicts).
These ``Views`` often restrict element access, with either the entire view or
layers of nested mappings being read-only.
"""
from collections.abc import Mapping
__all__ = [
"AtlasView",
"AdjacencyView",
"MultiAdjacencyView",
"UnionAtlas",
"UnionAdjacency",
"UnionMultiInner",
"UnionMultiAdjacency",
"FilterAtlas",
"FilterAdjacency",
"FilterMultiInner",
"FilterMultiAdjacency",
]
[docs]
class AtlasView(Mapping):
"""An AtlasView is a Read-only Mapping of Mappings.
It is a View into a dict-of-dict data structure.
The inner level of dict is read-write. But the
outer level is read-only.
See Also
========
AdjacencyView: View into dict-of-dict-of-dict
MultiAdjacencyView: View into dict-of-dict-of-dict-of-dict
"""
__slots__ = ("_atlas",)
def __getstate__(self):
return {"_atlas": self._atlas}
def __setstate__(self, state):
self._atlas = state["_atlas"]
[docs]
def __init__(self, d):
self._atlas = d
def __len__(self):
return len(self._atlas)
def __iter__(self):
return iter(self._atlas)
def __getitem__(self, key):
return self._atlas[key]
[docs]
def copy(self):
return {n: self[n].copy() for n in self._atlas}
def __str__(self):
return str(self._atlas) # {nbr: self[nbr] for nbr in self})
def __repr__(self):
return f"{self.__class__.__name__}({self._atlas!r})"
[docs]
class AdjacencyView(AtlasView):
"""An AdjacencyView is a Read-only Map of Maps of Maps.
It is a View into a dict-of-dict-of-dict data structure.
The inner level of dict is read-write. But the
outer levels are read-only.
See Also
========
AtlasView: View into dict-of-dict
MultiAdjacencyView: View into dict-of-dict-of-dict-of-dict
"""
__slots__ = () # Still uses AtlasView slots names _atlas
def __getitem__(self, name):
return AtlasView(self._atlas[name])
[docs]
def copy(self):
return {n: self[n].copy() for n in self._atlas}
[docs]
class MultiAdjacencyView(AdjacencyView):
"""An MultiAdjacencyView is a Read-only Map of Maps of Maps of Maps.
It is a View into a dict-of-dict-of-dict-of-dict data structure.
The inner level of dict is read-write. But the
outer levels are read-only.
See Also
========
AtlasView: View into dict-of-dict
AdjacencyView: View into dict-of-dict-of-dict
"""
__slots__ = () # Still uses AtlasView slots names _atlas
def __getitem__(self, name):
return AdjacencyView(self._atlas[name])
[docs]
def copy(self):
return {n: self[n].copy() for n in self._atlas}
[docs]
class UnionAtlas(Mapping):
"""A read-only union of two atlases (dict-of-dict).
The two dict-of-dicts represent the inner dict of
an Adjacency: `G.succ[node]` and `G.pred[node]`.
The inner level of dict of both hold attribute key:value
pairs and is read-write. But the outer level is read-only.
See Also
========
UnionAdjacency: View into dict-of-dict-of-dict
UnionMultiAdjacency: View into dict-of-dict-of-dict-of-dict
"""
__slots__ = ("_succ", "_pred")
def __getstate__(self):
return {"_succ": self._succ, "_pred": self._pred}
def __setstate__(self, state):
self._succ = state["_succ"]
self._pred = state["_pred"]
[docs]
def __init__(self, succ, pred):
self._succ = succ
self._pred = pred
def __len__(self):
return len(self._succ.keys() | self._pred.keys())
def __iter__(self):
return iter(set(self._succ.keys()) | set(self._pred.keys()))
def __getitem__(self, key):
try:
return self._succ[key]
except KeyError:
return self._pred[key]
[docs]
def copy(self):
result = {nbr: dd.copy() for nbr, dd in self._succ.items()}
for nbr, dd in self._pred.items():
if nbr in result:
result[nbr].update(dd)
else:
result[nbr] = dd.copy()
return result
def __str__(self):
return str({nbr: self[nbr] for nbr in self})
def __repr__(self):
return f"{self.__class__.__name__}({self._succ!r}, {self._pred!r})"
[docs]
class UnionAdjacency(Mapping):
"""A read-only union of dict Adjacencies as a Map of Maps of Maps.
The two input dict-of-dict-of-dicts represent the union of
`G.succ` and `G.pred`. Return values are UnionAtlas
The inner level of dict is read-write. But the
middle and outer levels are read-only.
succ : a dict-of-dict-of-dict {node: nbrdict}
pred : a dict-of-dict-of-dict {node: nbrdict}
The keys for the two dicts should be the same
See Also
========
UnionAtlas: View into dict-of-dict
UnionMultiAdjacency: View into dict-of-dict-of-dict-of-dict
"""
__slots__ = ("_succ", "_pred")
def __getstate__(self):
return {"_succ": self._succ, "_pred": self._pred}
def __setstate__(self, state):
self._succ = state["_succ"]
self._pred = state["_pred"]
[docs]
def __init__(self, succ, pred):
# keys must be the same for two input dicts
assert len(set(succ.keys()) ^ set(pred.keys())) == 0
self._succ = succ
self._pred = pred
def __len__(self):
return len(self._succ) # length of each dict should be the same
def __iter__(self):
return iter(self._succ)
def __getitem__(self, nbr):
return UnionAtlas(self._succ[nbr], self._pred[nbr])
[docs]
def copy(self):
return {n: self[n].copy() for n in self._succ}
def __str__(self):
return str({nbr: self[nbr] for nbr in self})
def __repr__(self):
return f"{self.__class__.__name__}({self._succ!r}, {self._pred!r})"
[docs]
class UnionMultiInner(UnionAtlas):
"""A read-only union of two inner dicts of MultiAdjacencies.
The two input dict-of-dict-of-dicts represent the union of
`G.succ[node]` and `G.pred[node]` for MultiDiGraphs.
Return values are UnionAtlas.
The inner level of dict is read-write. But the outer levels are read-only.
See Also
========
UnionAtlas: View into dict-of-dict
UnionAdjacency: View into dict-of-dict-of-dict
UnionMultiAdjacency: View into dict-of-dict-of-dict-of-dict
"""
__slots__ = () # Still uses UnionAtlas slots names _succ, _pred
def __getitem__(self, node):
in_succ = node in self._succ
in_pred = node in self._pred
if in_succ:
if in_pred:
return UnionAtlas(self._succ[node], self._pred[node])
return UnionAtlas(self._succ[node], {})
return UnionAtlas({}, self._pred[node])
[docs]
def copy(self):
nodes = set(self._succ.keys()) | set(self._pred.keys())
return {n: self[n].copy() for n in nodes}
[docs]
class UnionMultiAdjacency(UnionAdjacency):
"""A read-only union of two dict MultiAdjacencies.
The two input dict-of-dict-of-dict-of-dicts represent the union of
`G.succ` and `G.pred` for MultiDiGraphs. Return values are UnionAdjacency.
The inner level of dict is read-write. But the outer levels are read-only.
See Also
========
UnionAtlas: View into dict-of-dict
UnionMultiInner: View into dict-of-dict-of-dict
"""
__slots__ = () # Still uses UnionAdjacency slots names _succ, _pred
def __getitem__(self, node):
return UnionMultiInner(self._succ[node], self._pred[node])
[docs]
class FilterAtlas(Mapping): # nodedict, nbrdict, keydict
"""A read-only Mapping of Mappings with filtering criteria for nodes.
It is a view into a dict-of-dict data structure, and it selects only
nodes that meet the criteria defined by ``NODE_OK``.
See Also
========
FilterAdjacency
FilterMultiInner
FilterMultiAdjacency
"""
[docs]
def __init__(self, d, NODE_OK):
self._atlas = d
self.NODE_OK = NODE_OK
def __len__(self):
# check whether NODE_OK stores the number of nodes as `length`
# or the nodes themselves as a set `nodes`. If not, count the nodes.
if hasattr(self.NODE_OK, "length"):
return self.NODE_OK.length
if hasattr(self.NODE_OK, "nodes"):
return len(self.NODE_OK.nodes & self._atlas.keys())
return sum(1 for n in self._atlas if self.NODE_OK(n))
def __iter__(self):
try: # check that NODE_OK has attr 'nodes'
node_ok_shorter = 2 * len(self.NODE_OK.nodes) < len(self._atlas)
except AttributeError:
node_ok_shorter = False
if node_ok_shorter:
return (n for n in self.NODE_OK.nodes if n in self._atlas)
return (n for n in self._atlas if self.NODE_OK(n))
def __getitem__(self, key):
if key in self._atlas and self.NODE_OK(key):
return self._atlas[key]
raise KeyError(f"Key {key} not found")
def __str__(self):
return str({nbr: self[nbr] for nbr in self})
def __repr__(self):
return f"{self.__class__.__name__}({self._atlas!r}, {self.NODE_OK!r})"
[docs]
class FilterAdjacency(Mapping): # edgedict
"""A read-only Mapping of Mappings with filtering criteria for nodes and edges.
It is a view into a dict-of-dict-of-dict data structure, and it selects nodes
and edges that satisfy specific criteria defined by ``NODE_OK`` and ``EDGE_OK``,
respectively.
See Also
========
FilterAtlas
FilterMultiInner
FilterMultiAdjacency
"""
[docs]
def __init__(self, d, NODE_OK, EDGE_OK):
self._atlas = d
self.NODE_OK = NODE_OK
self.EDGE_OK = EDGE_OK
def __len__(self):
# check whether NODE_OK stores the number of nodes as `length`
# or the nodes themselves as a set `nodes`. If not, count the nodes.
if hasattr(self.NODE_OK, "length"):
return self.NODE_OK.length
if hasattr(self.NODE_OK, "nodes"):
return len(self.NODE_OK.nodes & self._atlas.keys())
return sum(1 for n in self._atlas if self.NODE_OK(n))
def __iter__(self):
try: # check that NODE_OK has attr 'nodes'
node_ok_shorter = 2 * len(self.NODE_OK.nodes) < len(self._atlas)
except AttributeError:
node_ok_shorter = False
if node_ok_shorter:
return (n for n in self.NODE_OK.nodes if n in self._atlas)
return (n for n in self._atlas if self.NODE_OK(n))
def __getitem__(self, node):
if node in self._atlas and self.NODE_OK(node):
def new_node_ok(nbr):
return self.NODE_OK(nbr) and self.EDGE_OK(node, nbr)
return FilterAtlas(self._atlas[node], new_node_ok)
raise KeyError(f"Key {node} not found")
def __str__(self):
return str({nbr: self[nbr] for nbr in self})
def __repr__(self):
name = self.__class__.__name__
return f"{name}({self._atlas!r}, {self.NODE_OK!r}, {self.EDGE_OK!r})"
[docs]
class FilterMultiInner(FilterAdjacency): # muliedge_seconddict
"""A read-only Mapping of Mappings with filtering criteria for nodes and edges.
It is a view into a dict-of-dict-of-dict-of-dict data structure, and it selects nodes
and edges that meet specific criteria defined by ``NODE_OK`` and ``EDGE_OK``.
See Also
========
FilterAtlas
FilterAdjacency
FilterMultiAdjacency
"""
def __iter__(self):
try: # check that NODE_OK has attr 'nodes'
node_ok_shorter = 2 * len(self.NODE_OK.nodes) < len(self._atlas)
except AttributeError:
node_ok_shorter = False
if node_ok_shorter:
my_nodes = (n for n in self.NODE_OK.nodes if n in self._atlas)
else:
my_nodes = (n for n in self._atlas if self.NODE_OK(n))
for n in my_nodes:
some_keys_ok = False
for key in self._atlas[n]:
if self.EDGE_OK(n, key):
some_keys_ok = True
break
if some_keys_ok is True:
yield n
def __getitem__(self, nbr):
if nbr in self._atlas and self.NODE_OK(nbr):
def new_node_ok(key):
return self.EDGE_OK(nbr, key)
return FilterAtlas(self._atlas[nbr], new_node_ok)
raise KeyError(f"Key {nbr} not found")
[docs]
class FilterMultiAdjacency(FilterAdjacency): # multiedgedict
"""A read-only Mapping of Mappings with filtering criteria
for nodes and edges.
It is a view into a dict-of-dict-of-dict-of-dict data structure,
and it selects nodes and edges that satisfy specific criteria
defined by ``NODE_OK`` and ``EDGE_OK``, respectively.
See Also
========
FilterAtlas
FilterAdjacency
FilterMultiInner
"""
def __getitem__(self, node):
if node in self._atlas and self.NODE_OK(node):
def edge_ok(nbr, key):
return self.NODE_OK(nbr) and self.EDGE_OK(node, nbr, key)
return FilterMultiInner(self._atlas[node], self.NODE_OK, edge_ok)
raise KeyError(f"Key {node} not found")
