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This commit is contained in:
ladeng07
2022-05-06 15:45:57 +08:00
parent 12f390949b
commit 51552904f9
2347 changed files with 120102 additions and 53549 deletions
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venv/Lib/site-packages/django/utils/tree.py
+36 -36
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@@ -14,10 +14,9 @@ class Node:
connection (the root) with the children being either leaf nodes or other
Node instances.
"""
# Standard connector type. Clients usually won't use this at all and
# subclasses will usually override the value.
default = "DEFAULT"
default = 'DEFAULT'
def __init__(self, children=None, connector=None, negated=False):
"""Construct a new Node. If no connector is given, use the default."""
@@ -42,8 +41,8 @@ class Node:
return obj
def __str__(self):
template = "(NOT (%s: %s))" if self.negated else "(%s: %s)"
return template % (self.connector, ", ".join(str(c) for c in self.children))
template = '(NOT (%s: %s))' if self.negated else '(%s: %s)'
return template % (self.connector, ', '.join(str(c) for c in self.children))
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self)
@@ -68,23 +67,15 @@ class Node:
def __eq__(self, other):
return (
self.__class__ == other.__class__
and self.connector == other.connector
and self.negated == other.negated
and self.children == other.children
self.__class__ == other.__class__ and
(self.connector, self.negated) == (other.connector, other.negated) and
self.children == other.children
)
def __hash__(self):
return hash(
(
self.__class__,
self.connector,
self.negated,
*make_hashable(self.children),
)
)
return hash((self.__class__, self.connector, self.negated, *make_hashable(self.children)))
def add(self, data, conn_type):
def add(self, data, conn_type, squash=True):
"""
Combine this tree and the data represented by data using the
connector conn_type. The combine is done by squashing the node other
@@ -95,29 +86,38 @@ class Node:
Return a node which can be used in place of data regardless if the
node other got squashed or not.
If `squash` is False the data is prepared and added as a child to
this tree without further logic.
"""
if self.connector != conn_type:
obj = self._new_instance(self.children, self.connector, self.negated)
if self.connector == conn_type and data in self.children:
return data
if not squash:
self.children.append(data)
return data
if self.connector == conn_type:
# We can reuse self.children to append or squash the node other.
if (isinstance(data, Node) and not data.negated and
(data.connector == conn_type or len(data) == 1)):
# We can squash the other node's children directly into this
# node. We are just doing (AB)(CD) == (ABCD) here, with the
# addition that if the length of the other node is 1 the
# connector doesn't matter. However, for the len(self) == 1
# case we don't want to do the squashing, as it would alter
# self.connector.
self.children.extend(data.children)
return self
else:
# We could use perhaps additional logic here to see if some
# children could be used for pushdown here.
self.children.append(data)
return data
else:
obj = self._new_instance(self.children, self.connector,
self.negated)
self.connector = conn_type
self.children = [obj, data]
return data
elif (
isinstance(data, Node)
and not data.negated
and (data.connector == conn_type or len(data) == 1)
):
# We can squash the other node's children directly into this node.
# We are just doing (AB)(CD) == (ABCD) here, with the addition that
# if the length of the other node is 1 the connector doesn't
# matter. However, for the len(self) == 1 case we don't want to do
# the squashing, as it would alter self.connector.
self.children.extend(data.children)
return self
else:
# We could use perhaps additional logic here to see if some
# children could be used for pushdown here.
self.children.append(data)
return data
def negate(self):
"""Negate the sense of the root connector."""