/usr/lib/python2.7/dist-packages/pyqtgraph/flowchart/NodeLibrary.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | from ..pgcollections import OrderedDict
from .Node import Node
def isNodeClass(cls):
try:
if not issubclass(cls, Node):
return False
except:
return False
return hasattr(cls, 'nodeName')
class NodeLibrary:
"""
A library of flowchart Node types. Custom libraries may be built to provide
each flowchart with a specific set of allowed Node types.
"""
def __init__(self):
self.nodeList = OrderedDict()
self.nodeTree = OrderedDict()
def addNodeType(self, nodeClass, paths, override=False):
"""
Register a new node type. If the type's name is already in use,
an exception will be raised (unless override=True).
============== =========================================================
**Arguments:**
nodeClass a subclass of Node (must have typ.nodeName)
paths list of tuples specifying the location(s) this
type will appear in the library tree.
override if True, overwrite any class having the same name
============== =========================================================
"""
if not isNodeClass(nodeClass):
raise Exception("Object %s is not a Node subclass" % str(nodeClass))
name = nodeClass.nodeName
if not override and name in self.nodeList:
raise Exception("Node type name '%s' is already registered." % name)
self.nodeList[name] = nodeClass
for path in paths:
root = self.nodeTree
for n in path:
if n not in root:
root[n] = OrderedDict()
root = root[n]
root[name] = nodeClass
def getNodeType(self, name):
try:
return self.nodeList[name]
except KeyError:
raise Exception("No node type called '%s'" % name)
def getNodeTree(self):
return self.nodeTree
def copy(self):
"""
Return a copy of this library.
"""
lib = NodeLibrary()
lib.nodeList = self.nodeList.copy()
lib.nodeTree = self.treeCopy(self.nodeTree)
return lib
@staticmethod
def treeCopy(tree):
copy = OrderedDict()
for k,v in tree.items():
if isNodeClass(v):
copy[k] = v
else:
copy[k] = NodeLibrary.treeCopy(v)
return copy
def reload(self):
"""
Reload Node classes in this library.
"""
raise NotImplementedError()
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