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import graphviz
import json
from tempfile import NamedTemporaryFile
import os
def generate_class_diagram(json_input: str, output_format: str) -> str:
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(
name='ClassDiagram',
format='png',
graph_attr={
'rankdir': 'TB',
'splines': 'ortho',
'bgcolor': 'white',
'pad': '0.5',
'nodesep': '1.5',
'ranksep': '2.0'
}
)
base_color = '#19191a'
lightening_factor = 0.15
classes = data.get('classes', [])
relationships = data.get('relationships', [])
for i, cls in enumerate(classes):
class_name = cls.get('name')
class_type = cls.get('type', 'class')
attributes = cls.get('attributes', [])
methods = cls.get('methods', [])
if not class_name:
raise ValueError(f"Invalid class: {cls}")
current_depth = i % 6
if not isinstance(base_color, str) or not base_color.startswith('#') or len(base_color) != 7:
base_color_safe = '#19191a'
else:
base_color_safe = base_color
base_r = int(base_color_safe[1:3], 16)
base_g = int(base_color_safe[3:5], 16)
base_b = int(base_color_safe[5:7], 16)
current_r = base_r + int((255 - base_r) * current_depth * lightening_factor)
current_g = base_g + int((255 - base_g) * current_depth * lightening_factor)
current_b = base_b + int((255 - base_b) * current_depth * lightening_factor)
current_r = min(255, current_r)
current_g = min(255, current_g)
current_b = min(255, current_b)
node_color = f'#{current_r:02x}{current_g:02x}{current_b:02x}'
font_color = 'white' if current_depth * lightening_factor < 0.6 else 'black'
class_label = ""
if class_type == 'abstract':
class_label += "<<abstract>>\\n"
elif class_type == 'interface':
class_label += "<<interface>>\\n"
elif class_type == 'enum':
class_label += "<<enumeration>>\\n"
class_label += f"{class_name}\\l"
if attributes:
class_label += "\\l"
for attr in attributes:
visibility = attr.get('visibility', '+')
name = attr.get('name', '')
attr_type = attr.get('type', '')
is_static = attr.get('static', False)
attr_line = f"{visibility} "
if is_static:
attr_line += f"<<static>> "
attr_line += f"{name}"
if attr_type:
attr_line += f" : {attr_type}"
class_label += f"{attr_line}\\l"
if methods:
class_label += "\\l"
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)
method_line = f"{visibility} "
if is_static:
method_line += f"<<static>> "
if is_abstract:
method_line += f"<<abstract>> "
method_line += f"{name}("
if parameters:
param_strs = []
for param in parameters:
param_name = param.get('name', '')
param_type = param.get('type', '')
param_strs.append(f"{param_name}: {param_type}")
method_line += ", ".join(param_strs)
method_line += f") : {return_type}"
class_label += f"{method_line}\\l"
if class_type == 'interface':
style = 'filled,dashed'
else:
style = 'filled'
dot.node(
class_name,
class_label,
shape='record',
style=style,
fillcolor=node_color,
fontcolor=font_color,
fontsize='10',
fontname='Helvetica'
)
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 all([from_class, to_class]):
raise ValueError(f"Invalid relationship: {relationship}")
edge_label = label
if multiplicity_from or multiplicity_to:
edge_label += f"\\n{multiplicity_from} --- {multiplicity_to}"
if rel_type == 'inheritance':
dot.edge(from_class, to_class, arrowhead='empty', color='#4a4a4a', label=edge_label, fontsize='9')
elif rel_type == 'composition':
dot.edge(from_class, to_class, arrowhead='normal', arrowtail='diamond', dir='both', color='#4a4a4a', label=edge_label, fontsize='9')
elif rel_type == 'aggregation':
dot.edge(from_class, to_class, arrowhead='normal', arrowtail='odiamond', dir='both', color='#4a4a4a', label=edge_label, fontsize='9')
elif rel_type == 'realization':
dot.edge(from_class, to_class, arrowhead='empty', style='dashed', color='#4a4a4a', label=edge_label, fontsize='9')
elif rel_type == 'dependency':
dot.edge(from_class, to_class, arrowhead='normal', style='dashed', color='#4a4a4a', label=edge_label, fontsize='9')
else:
dot.edge(from_class, to_class, arrowhead='normal', color='#4a4a4a', label=edge_label, fontsize='9')
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)}" |