| 24 | 24 | |
| 25 | 25 | class Graph: |
| 26 | 26 | def __init__(self, data: list | None = None): |
| 27 | | pass |
| 27 | # Edge Case: Validate that data is a list |
| 28 | if not isinstance(data, list): |
| 29 | raise TypeError("Graph data malformed") |
| 30 | |
| 31 | self.nodes = [] |
| 32 | self.edges = [] |
| 33 | self.attrs = {} |
| 34 | |
| 35 | # Process each item in the data list |
| 36 | for item in data: |
| 37 | # Edge Case: Validate that each item is a tuple |
| 38 | if not isinstance(item, tuple): |
| 39 | raise TypeError("Graph item malformed") |
| 40 | |
| 41 | # Edge Case: Validate that each tuple has at least one element |
| 42 | if len(item) < 1: |
| 43 | raise TypeError("Graph item malformed") |
| 44 | |
| 45 | item_type = item[0] |
| 46 | |
| 47 | # Edge Case: Handle NODE type |
| 48 | if item_type == NODE: |
| 49 | # Edge Case: Validate NODE tuple structure (3 elements: type, name, attrs) |
| 50 | if len(item) != 3: |
| 51 | raise TypeError("Graph item malformed") |
| 52 | |
| 53 | name, attrs = item[1], item[2] |
| 54 | # Edge Case: Validate that node name is a string |
| 55 | if not isinstance(name, str): |
| 56 | raise TypeError("Graph item malformed") |
| 57 | # Edge Case: Validate that node attrs is a dict |
| 58 | if not isinstance(attrs, dict): |
| 59 | raise TypeError("Graph item malformed") |
| 60 | |
| 61 | self.nodes.append(Node(name, attrs)) |
| 62 | |
| 63 | # Edge Case: Handle EDGE type |
| 64 | elif item_type == EDGE: |
| 65 | # Edge Case: Validate EDGE tuple structure (4 elements: type, src, dst, attrs) |
| 66 | if len(item) != 4: |
| 67 | raise TypeError("Graph item malformed") |
| 68 | |
| 69 | src, dst, attrs = item[1], item[2], item[3] |
| 70 | # Edge Case: Validate that edge src and dst are strings |
| 71 | if not isinstance(src, str) or not isinstance(dst, str): |
| 72 | raise TypeError("Graph item malformed") |
| 73 | # Edge Case: Validate that edge attrs is a dict |
| 74 | if not isinstance(attrs, dict): |
| 75 | raise TypeError("Graph item malformed") |
| 76 | |
| 77 | self.edges.append(Edge(src, dst, attrs)) |
| 78 | |
| 79 | # Edge Case: Handle ATTR type |
| 80 | elif item_type == ATTR: |
| 81 | # Edge Case: Validate ATTR tuple structure (3 elements: type, key, value) |
| 82 | if len(item) != 3: |
| 83 | raise TypeError("Graph item malformed") |
| 84 | |
| 85 | key, value = item[1], item[2] |
| 86 | # Edge Case: Validate that attribute key and value are strings |
| 87 | if not isinstance(key, str) or not isinstance(value, str): |
| 88 | raise TypeError("Graph item malformed") |
| 89 | |
| 90 | self.attrs[key] = value |
| 91 | |
| 92 | # Edge Case: Handle unknown item types |
| 93 | else: |
| 94 | raise ValueError("Unknown item") |
| 95 | |