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261 lines
8.7 KiB
Python
261 lines
8.7 KiB
Python
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
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# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt
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"""Diagram objects."""
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import astroid
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from astroid import nodes
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from pylint.checkers.utils import decorated_with_property
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from pylint.pyreverse.utils import FilterMixIn, is_interface
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class Figure:
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"""Base class for counter handling."""
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class Relationship(Figure):
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"""A relationship from an object in the diagram to another."""
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def __init__(self, from_object, to_object, relation_type, name=None):
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super().__init__()
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self.from_object = from_object
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self.to_object = to_object
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self.type = relation_type
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self.name = name
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class DiagramEntity(Figure):
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"""A diagram object, i.e. a label associated to an astroid node."""
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def __init__(self, title="No name", node=None):
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super().__init__()
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self.title = title
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self.node = node
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class PackageEntity(DiagramEntity):
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"""A diagram object representing a package."""
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class ClassEntity(DiagramEntity):
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"""A diagram object representing a class."""
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def __init__(self, title, node):
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super().__init__(title=title, node=node)
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self.attrs = None
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self.methods = None
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class ClassDiagram(Figure, FilterMixIn):
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"""Main class diagram handling."""
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TYPE = "class"
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def __init__(self, title, mode):
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FilterMixIn.__init__(self, mode)
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Figure.__init__(self)
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self.title = title
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self.objects = []
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self.relationships = {}
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self._nodes = {}
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self.depends = []
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def get_relationships(self, role):
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# sorted to get predictable (hence testable) results
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return sorted(
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self.relationships.get(role, ()),
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key=lambda x: (x.from_object.fig_id, x.to_object.fig_id),
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)
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def add_relationship(self, from_object, to_object, relation_type, name=None):
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"""Create a relationship."""
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rel = Relationship(from_object, to_object, relation_type, name)
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self.relationships.setdefault(relation_type, []).append(rel)
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def get_relationship(self, from_object, relation_type):
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"""Return a relationship or None."""
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for rel in self.relationships.get(relation_type, ()):
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if rel.from_object is from_object:
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return rel
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raise KeyError(relation_type)
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def get_attrs(self, node):
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"""Return visible attributes, possibly with class name."""
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attrs = []
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properties = [
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(n, m)
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for n, m in node.items()
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if isinstance(m, nodes.FunctionDef) and decorated_with_property(m)
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]
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for node_name, associated_nodes in (
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list(node.instance_attrs_type.items())
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+ list(node.locals_type.items())
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+ properties
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):
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if not self.show_attr(node_name):
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continue
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names = self.class_names(associated_nodes)
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if names:
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node_name = f"{node_name} : {', '.join(names)}"
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attrs.append(node_name)
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return sorted(attrs)
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def get_methods(self, node):
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"""Return visible methods."""
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methods = [
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m
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for m in node.values()
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if isinstance(m, nodes.FunctionDef)
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and not isinstance(m, astroid.objects.Property)
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and not decorated_with_property(m)
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and self.show_attr(m.name)
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]
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return sorted(methods, key=lambda n: n.name)
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def add_object(self, title, node):
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"""Create a diagram object."""
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assert node not in self._nodes
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ent = DiagramEntity(title, node)
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self._nodes[node] = ent
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self.objects.append(ent)
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def class_names(self, nodes_lst):
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"""Return class names if needed in diagram."""
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names = []
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for node in nodes_lst:
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if isinstance(node, astroid.Instance):
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node = node._proxied
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if (
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isinstance(node, (nodes.ClassDef, nodes.Name, nodes.Subscript))
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and hasattr(node, "name")
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and not self.has_node(node)
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):
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if node.name not in names:
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node_name = node.name
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names.append(node_name)
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return names
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def nodes(self):
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"""Return the list of underlying nodes."""
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return self._nodes.keys()
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def has_node(self, node):
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"""Return true if the given node is included in the diagram."""
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return node in self._nodes
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def object_from_node(self, node):
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"""Return the diagram object mapped to node."""
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return self._nodes[node]
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def classes(self):
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"""Return all class nodes in the diagram."""
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return [o for o in self.objects if isinstance(o.node, nodes.ClassDef)]
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def classe(self, name):
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"""Return a class by its name, raise KeyError if not found."""
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for klass in self.classes():
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if klass.node.name == name:
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return klass
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raise KeyError(name)
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def extract_relationships(self):
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"""Extract relationships between nodes in the diagram."""
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for obj in self.classes():
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node = obj.node
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obj.attrs = self.get_attrs(node)
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obj.methods = self.get_methods(node)
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# shape
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if is_interface(node):
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obj.shape = "interface"
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else:
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obj.shape = "class"
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# inheritance link
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for par_node in node.ancestors(recurs=False):
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try:
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par_obj = self.object_from_node(par_node)
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self.add_relationship(obj, par_obj, "specialization")
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except KeyError:
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continue
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# implements link
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for impl_node in node.implements:
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try:
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impl_obj = self.object_from_node(impl_node)
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self.add_relationship(obj, impl_obj, "implements")
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except KeyError:
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continue
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# associations link
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for name, values in list(node.instance_attrs_type.items()) + list(
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node.locals_type.items()
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):
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for value in values:
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if value is astroid.Uninferable:
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continue
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if isinstance(value, astroid.Instance):
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value = value._proxied
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try:
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associated_obj = self.object_from_node(value)
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self.add_relationship(associated_obj, obj, "association", name)
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except KeyError:
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continue
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class PackageDiagram(ClassDiagram):
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"""Package diagram handling."""
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TYPE = "package"
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def modules(self):
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"""Return all module nodes in the diagram."""
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return [o for o in self.objects if isinstance(o.node, nodes.Module)]
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def module(self, name):
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"""Return a module by its name, raise KeyError if not found."""
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for mod in self.modules():
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if mod.node.name == name:
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return mod
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raise KeyError(name)
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def get_module(self, name, node):
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"""Return a module by its name, looking also for relative imports;
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raise KeyError if not found
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"""
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for mod in self.modules():
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mod_name = mod.node.name
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if mod_name == name:
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return mod
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# search for fullname of relative import modules
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package = node.root().name
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if mod_name == f"{package}.{name}":
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return mod
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if mod_name == f"{package.rsplit('.', 1)[0]}.{name}":
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return mod
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raise KeyError(name)
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def add_from_depend(self, node, from_module):
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"""Add dependencies created by from-imports."""
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mod_name = node.root().name
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obj = self.module(mod_name)
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if from_module not in obj.node.depends:
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obj.node.depends.append(from_module)
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def extract_relationships(self):
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"""Extract relationships between nodes in the diagram."""
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super().extract_relationships()
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for obj in self.classes():
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# ownership
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try:
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mod = self.object_from_node(obj.node.root())
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self.add_relationship(obj, mod, "ownership")
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except KeyError:
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continue
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for obj in self.modules():
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obj.shape = "package"
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# dependencies
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for dep_name in obj.node.depends:
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try:
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dep = self.get_module(dep_name, obj.node)
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except KeyError:
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continue
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self.add_relationship(obj, dep, "depends")
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