| import graphviz | |
| import json | |
| from tempfile import NamedTemporaryFile | |
| import os | |
| def generate_class_diagram(json_input: str, output_format: str) -> str: | |
| """ | |
| Generates a class diagram from JSON input. | |
| Args: | |
| json_input (str): A JSON string describing the class diagram structure. | |
| It must follow the Expected JSON Format Example below. | |
| Expected JSON Format Example: | |
| { | |
| "classes": [ | |
| { | |
| "name": "Vehicle", | |
| "type": "abstract", | |
| "attributes": [ | |
| {"name": "id", "type": "String", "visibility": "-"}, | |
| {"name": "brand", "type": "String", "visibility": "#"}, | |
| {"name": "model", "type": "String", "visibility": "#"}, | |
| {"name": "year", "type": "int", "visibility": "#"}, | |
| {"name": "price", "type": "double", "visibility": "+"}, | |
| {"name": "vehicleCount", "type": "int", "visibility": "+", "static": true} | |
| ], | |
| "methods": [ | |
| {"name": "Vehicle", "parameters": [{"name": "brand", "type": "String"}, {"name": "model", "type": "String"}], "return_type": "Vehicle", "visibility": "+"}, | |
| {"name": "startEngine", "return_type": "void", "visibility": "+", "abstract": true}, | |
| {"name": "stopEngine", "return_type": "void", "visibility": "+"}, | |
| {"name": "getPrice", "return_type": "double", "visibility": "+"}, | |
| {"name": "setPrice", "parameters": [{"name": "price", "type": "double"}], "return_type": "void", "visibility": "+"}, | |
| {"name": "getTotalVehicles", "return_type": "int", "visibility": "+", "static": true} | |
| ] | |
| }, | |
| { | |
| "name": "Car", | |
| "type": "class", | |
| "attributes": [ | |
| {"name": "doors", "type": "int", "visibility": "-"}, | |
| {"name": "transmission", "type": "TransmissionType", "visibility": "-"}, | |
| {"name": "fuelType", "type": "FuelType", "visibility": "-"} | |
| ], | |
| "methods": [ | |
| {"name": "Car", "parameters": [{"name": "brand", "type": "String"}, {"name": "model", "type": "String"}, {"name": "doors", "type": "int"}], "return_type": "Car", "visibility": "+"}, | |
| {"name": "startEngine", "return_type": "void", "visibility": "+"}, | |
| {"name": "openTrunk", "return_type": "void", "visibility": "+"}, | |
| {"name": "getDoors", "return_type": "int", "visibility": "+"}, | |
| {"name": "setTransmission", "parameters": [{"name": "transmission", "type": "TransmissionType"}], "return_type": "void", "visibility": "+"} | |
| ] | |
| }, | |
| { | |
| "name": "Motorcycle", | |
| "type": "class", | |
| "attributes": [ | |
| {"name": "engineSize", "type": "int", "visibility": "-"}, | |
| {"name": "hasWindshield", "type": "boolean", "visibility": "-"} | |
| ], | |
| "methods": [ | |
| {"name": "Motorcycle", "parameters": [{"name": "brand", "type": "String"}, {"name": "model", "type": "String"}], "return_type": "Motorcycle", "visibility": "+"}, | |
| {"name": "startEngine", "return_type": "void", "visibility": "+"}, | |
| {"name": "wheelie", "return_type": "void", "visibility": "+"}, | |
| {"name": "getEngineSize", "return_type": "int", "visibility": "+"} | |
| ] | |
| }, | |
| { | |
| "name": "Engine", | |
| "type": "class", | |
| "attributes": [ | |
| {"name": "horsepower", "type": "int", "visibility": "-"}, | |
| {"name": "cylinders", "type": "int", "visibility": "-"}, | |
| {"name": "fuelType", "type": "FuelType", "visibility": "-"} | |
| ], | |
| "methods": [ | |
| {"name": "Engine", "parameters": [{"name": "horsepower", "type": "int"}, {"name": "cylinders", "type": "int"}], "return_type": "Engine", "visibility": "+"}, | |
| {"name": "start", "return_type": "boolean", "visibility": "+"}, | |
| {"name": "stop", "return_type": "void", "visibility": "+"}, | |
| {"name": "getHorsepower", "return_type": "int", "visibility": "+"} | |
| ] | |
| }, | |
| { | |
| "name": "TransmissionType", | |
| "type": "enum", | |
| "attributes": [ | |
| {"name": "MANUAL", "type": "TransmissionType", "visibility": "+", "static": true}, | |
| {"name": "AUTOMATIC", "type": "TransmissionType", "visibility": "+", "static": true}, | |
| {"name": "CVT", "type": "TransmissionType", "visibility": "+", "static": true} | |
| ], | |
| "methods": [] | |
| }, | |
| { | |
| "name": "FuelType", | |
| "type": "enum", | |
| "attributes": [ | |
| {"name": "GASOLINE", "type": "FuelType", "visibility": "+", "static": true}, | |
| {"name": "DIESEL", "type": "FuelType", "visibility": "+", "static": true}, | |
| {"name": "ELECTRIC", "type": "FuelType", "visibility": "+", "static": true}, | |
| {"name": "HYBRID", "type": "FuelType", "visibility": "+", "static": true} | |
| ], | |
| "methods": [] | |
| }, | |
| { | |
| "name": "VehicleService", | |
| "type": "interface", | |
| "attributes": [], | |
| "methods": [ | |
| {"name": "maintenance", "parameters": [{"name": "vehicle", "type": "Vehicle"}], "return_type": "void", "visibility": "+", "abstract": true}, | |
| {"name": "repair", "parameters": [{"name": "vehicle", "type": "Vehicle"}, {"name": "issue", "type": "String"}], "return_type": "boolean", "visibility": "+", "abstract": true}, | |
| {"name": "inspectVehicle", "parameters": [{"name": "vehicle", "type": "Vehicle"}], "return_type": "InspectionReport", "visibility": "+", "abstract": true} | |
| ] | |
| }, | |
| { | |
| "name": "GarageService", | |
| "type": "class", | |
| "attributes": [ | |
| {"name": "garageName", "type": "String", "visibility": "-"}, | |
| {"name": "location", "type": "String", "visibility": "-"} | |
| ], | |
| "methods": [ | |
| {"name": "GarageService", "parameters": [{"name": "name", "type": "String"}], "return_type": "GarageService", "visibility": "+"}, | |
| {"name": "maintenance", "parameters": [{"name": "vehicle", "type": "Vehicle"}], "return_type": "void", "visibility": "+"}, | |
| {"name": "repair", "parameters": [{"name": "vehicle", "type": "Vehicle"}, {"name": "issue", "type": "String"}], "return_type": "boolean", "visibility": "+"}, | |
| {"name": "inspectVehicle", "parameters": [{"name": "vehicle", "type": "Vehicle"}], "return_type": "InspectionReport", "visibility": "+"} | |
| ] | |
| } | |
| ], | |
| "relationships": [ | |
| { | |
| "from": "Car", | |
| "to": "Vehicle", | |
| "type": "inheritance" | |
| }, | |
| { | |
| "from": "Motorcycle", | |
| "to": "Vehicle", | |
| "type": "inheritance" | |
| }, | |
| { | |
| "from": "Car", | |
| "to": "Engine", | |
| "type": "composition", | |
| "multiplicity_from": "1", | |
| "multiplicity_to": "1" | |
| }, | |
| { | |
| "from": "Motorcycle", | |
| "to": "Engine", | |
| "type": "composition", | |
| "multiplicity_from": "1", | |
| "multiplicity_to": "1" | |
| }, | |
| { | |
| "from": "Car", | |
| "to": "TransmissionType", | |
| "type": "association", | |
| "multiplicity_from": "1", | |
| "multiplicity_to": "1" | |
| }, | |
| { | |
| "from": "Vehicle", | |
| "to": "FuelType", | |
| "type": "association", | |
| "multiplicity_from": "1", | |
| "multiplicity_to": "1" | |
| }, | |
| { | |
| "from": "GarageService", | |
| "to": "VehicleService", | |
| "type": "realization" | |
| }, | |
| { | |
| "from": "GarageService", | |
| "to": "Vehicle", | |
| "type": "dependency", | |
| "multiplicity_from": "1", | |
| "multiplicity_to": "*" | |
| } | |
| ] | |
| } | |
| Returns: | |
| str: The filepath to the generated PNG image file. | |
| """ | |
| try: | |
| if not json_input.strip(): | |
| return "Error: Empty input" | |
| data = json.loads(json_input) | |
| if 'classes' not in data: | |
| raise ValueError("Missing required field: classes") | |
| dot = graphviz.Digraph(comment='Class Diagram') | |
| dot.attr(rankdir='TB', bgcolor='white', pad='0.5', nodesep='0.8', ranksep='1.2', splines='ortho') | |
| dot.attr('node', shape='plaintext', fontname='Arial', fontsize='11') | |
| dot.attr('edge', color='black', fontname='Arial', fontsize='9', minlen='1') | |
| classes = data.get('classes', []) | |
| relationships = data.get('relationships', []) | |
| for cls in classes: | |
| class_name = cls.get('name') | |
| class_type = cls.get('type', 'class') | |
| attributes = cls.get('attributes', []) | |
| methods = cls.get('methods', []) | |
| if not class_name: | |
| continue | |
| html_label = '<TABLE BORDER="1" CELLBORDER="0" CELLSPACING="0" CELLPADDING="5" BGCOLOR="white">' | |
| if class_type == 'abstract': | |
| html_label += f'<TR><TD ALIGN="CENTER"><B><<abstract>><BR/>{class_name}</B></TD></TR>' | |
| elif class_type == 'interface': | |
| html_label += f'<TR><TD ALIGN="CENTER"><B><<interface>><BR/>{class_name}</B></TD></TR>' | |
| elif class_type == 'enum': | |
| html_label += f'<TR><TD ALIGN="CENTER"><B><<enumeration>><BR/>{class_name}</B></TD></TR>' | |
| else: | |
| html_label += f'<TR><TD ALIGN="CENTER"><B>{class_name}</B></TD></TR>' | |
| html_label += '<HR/>' | |
| if attributes: | |
| for attr in attributes: | |
| visibility = attr.get('visibility', '+') | |
| name = attr.get('name', '') | |
| attr_type = attr.get('type', '') | |
| is_static = attr.get('static', False) | |
| line = f"{visibility} {name}" | |
| if attr_type: | |
| line += f" : {attr_type}" | |
| if is_static: | |
| line = f"<U>{line}</U>" | |
| html_label += f'<TR><TD ALIGN="LEFT">{line}</TD></TR>' | |
| else: | |
| html_label += '<TR><TD ALIGN="LEFT"> </TD></TR>' | |
| html_label += '<HR/>' | |
| if methods: | |
| for method in methods: | |
| visibility = method.get('visibility', '+') | |
| name = method.get('name', '') | |
| parameters = method.get('parameters', []) | |
| return_type = method.get('return_type', 'void') | |
| is_static = method.get('static', False) | |
| is_abstract = method.get('abstract', False) | |
| line = f"{visibility} {name}(" | |
| if parameters: | |
| params = [] | |
| for param in parameters: | |
| param_name = param.get('name', '') | |
| param_type = param.get('type', '') | |
| params.append(f"{param_name}: {param_type}") | |
| line += ", ".join(params) | |
| line += f") : {return_type}" | |
| if is_static: | |
| line = f"<U>{line}</U>" | |
| if is_abstract: | |
| line = f"<I>{line}</I>" | |
| html_label += f'<TR><TD ALIGN="LEFT">{line}</TD></TR>' | |
| else: | |
| html_label += '<TR><TD ALIGN="LEFT"> </TD></TR>' | |
| html_label += '</TABLE>' | |
| dot.node(class_name, f'<{html_label}>') | |
| for relationship in relationships: | |
| from_class = relationship.get('from') | |
| to_class = relationship.get('to') | |
| rel_type = relationship.get('type', 'association') | |
| label = relationship.get('label', '') | |
| multiplicity_from = relationship.get('multiplicity_from', '') | |
| multiplicity_to = relationship.get('multiplicity_to', '') | |
| if not from_class or not to_class: | |
| continue | |
| edge_attrs = { | |
| 'color': 'black' | |
| } | |
| if multiplicity_from: | |
| edge_attrs['taillabel'] = multiplicity_from | |
| if multiplicity_to: | |
| edge_attrs['headlabel'] = multiplicity_to | |
| if rel_type == 'inheritance': | |
| edge_attrs['arrowhead'] = 'empty' | |
| edge_attrs['color'] = 'black' | |
| elif rel_type == 'composition': | |
| edge_attrs['arrowhead'] = 'normal' | |
| edge_attrs['arrowtail'] = 'diamond' | |
| edge_attrs['dir'] = 'both' | |
| edge_attrs['color'] = 'black' | |
| elif rel_type == 'aggregation': | |
| edge_attrs['arrowhead'] = 'normal' | |
| edge_attrs['arrowtail'] = 'odiamond' | |
| edge_attrs['dir'] = 'both' | |
| edge_attrs['color'] = 'black' | |
| elif rel_type == 'realization': | |
| edge_attrs['arrowhead'] = 'empty' | |
| edge_attrs['style'] = 'dashed' | |
| edge_attrs['color'] = 'black' | |
| elif rel_type == 'dependency': | |
| edge_attrs['arrowhead'] = 'normal' | |
| edge_attrs['style'] = 'dashed' | |
| edge_attrs['color'] = 'black' | |
| else: | |
| edge_attrs['arrowhead'] = 'normal' | |
| edge_attrs['color'] = 'black' | |
| dot.edge(from_class, to_class, **edge_attrs) | |
| with NamedTemporaryFile(delete=False, suffix=f'.{output_format}') as tmp: | |
| dot.render(tmp.name, format=output_format, cleanup=True) | |
| return f"{tmp.name}.{output_format}" | |
| except json.JSONDecodeError: | |
| return "Error: Invalid JSON format" | |
| except Exception as e: | |
| return f"Error: {str(e)}" |