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88 lines
2.3 KiB
Python
88 lines
2.3 KiB
Python
from ..helpers import quote_string
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class Node:
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"""
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A node within the graph.
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"""
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def __init__(self, node_id=None, alias=None, label=None, properties=None):
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"""
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Create a new node.
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"""
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self.id = node_id
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self.alias = alias
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if isinstance(label, list):
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label = [inner_label for inner_label in label if inner_label != ""]
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if (
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label is None
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or label == ""
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or (isinstance(label, list) and len(label) == 0)
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):
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self.label = None
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self.labels = None
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elif isinstance(label, str):
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self.label = label
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self.labels = [label]
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elif isinstance(label, list) and all(
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[isinstance(inner_label, str) for inner_label in label]
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):
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self.label = label[0]
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self.labels = label
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else:
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raise AssertionError(
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"label should be either None, string or a list of strings"
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)
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self.properties = properties or {}
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def to_string(self):
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res = ""
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if self.properties:
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props = ",".join(
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key + ":" + str(quote_string(val))
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for key, val in sorted(self.properties.items())
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)
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res += "{" + props + "}"
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return res
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def __str__(self):
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res = "("
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if self.alias:
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res += self.alias
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if self.labels:
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res += ":" + ":".join(self.labels)
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if self.properties:
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props = ",".join(
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key + ":" + str(quote_string(val))
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for key, val in sorted(self.properties.items())
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)
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res += "{" + props + "}"
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res += ")"
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return res
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def __eq__(self, rhs):
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# Type checking
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if not isinstance(rhs, Node):
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return False
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# Quick positive check, if both IDs are set.
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if self.id is not None and rhs.id is not None and self.id != rhs.id:
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return False
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# Label should match.
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if self.label != rhs.label:
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return False
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# Quick check for number of properties.
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if len(self.properties) != len(rhs.properties):
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return False
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# Compare properties.
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if self.properties != rhs.properties:
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return False
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return True
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