# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt
"""Handle diagram generation options for class diagram or default diagrams."""
from __future__ import annotations
import argparse
from collections.abc import Generator
from typing import Any
import astroid
from astroid import nodes
from pylint.pyreverse.diagrams import ClassDiagram, PackageDiagram
from pylint.pyreverse.inspector import Linker, Project
from pylint.pyreverse.utils import LocalsVisitor
# diagram generators ##########################################################
class DiaDefGenerator:
"""Handle diagram generation options."""
def __init__(self, linker: Linker, handler: DiadefsHandler) -> None:
"""Common Diagram Handler initialization."""
self.config = handler.config
self.module_names: bool = False
self._set_default_options()
self.linker = linker
self.classdiagram: ClassDiagram # defined by subclasses
def get_title(self, node: nodes.ClassDef) -> str:
"""Get title for objects."""
title = node.name
if self.module_names:
title = f"{node.root().name}.{title}"
return title # type: ignore[no-any-return]
def _set_option(self, option: bool | None) -> bool:
"""Activate some options if not explicitly deactivated."""
# if we have a class diagram, we want more information by default;
# so if the option is None, we return True
if option is None:
return bool(self.config.classes)
return option
def _set_default_options(self) -> None:
"""Set different default options with _default dictionary."""
self.module_names = self._set_option(self.config.module_names)
all_ancestors = self._set_option(self.config.all_ancestors)
all_associated = self._set_option(self.config.all_associated)
anc_level, association_level = (0, 0)
if all_ancestors:
anc_level = -1
if all_associated:
association_level = -1
if self.config.show_ancestors is not None:
anc_level = self.config.show_ancestors
if self.config.show_associated is not None:
association_level = self.config.show_associated
self.anc_level, self.association_level = anc_level, association_level
def _get_levels(self) -> tuple[int, int]:
"""Help function for search levels."""
return self.anc_level, self.association_level
def show_node(self, node: nodes.ClassDef) -> bool:
"""True if builtins and not show_builtins."""
if self.config.show_builtin:
return True
return node.root().name != "builtins" # type: ignore[no-any-return]
def add_class(self, node: nodes.ClassDef) -> None:
"""Visit one class and add it to diagram."""
self.linker.visit(node)
self.classdiagram.add_object(self.get_title(node), node)
def get_ancestors(
self, node: nodes.ClassDef, level: int
) -> Generator[nodes.ClassDef, None, None]:
"""Return ancestor nodes of a class node."""
if level == 0:
return
for ancestor in node.ancestors(recurs=False):
if not self.show_node(ancestor):
continue
yield ancestor
def get_associated(
self, klass_node: nodes.ClassDef, level: int
) -> Generator[nodes.ClassDef, None, None]:
"""Return associated nodes of a class node."""
if level == 0:
return
for association_nodes in list(klass_node.instance_attrs_type.values()) + list(
klass_node.locals_type.values()
):
for node in association_nodes:
if isinstance(node, astroid.Instance):
node = node._proxied
if not (isinstance(node, nodes.ClassDef) and self.show_node(node)):
continue
yield node
def extract_classes(
self, klass_node: nodes.ClassDef, anc_level: int, association_level: int
) -> None:
"""Extract recursively classes related to klass_node."""
if self.classdiagram.has_node(klass_node) or not self.show_node(klass_node):
return
self.add_class(klass_node)
for ancestor in self.get_ancestors(klass_node, anc_level):
self.extract_classes(ancestor, anc_level - 1, association_level)
for node in self.get_associated(klass_node, association_level):
self.extract_classes(node, anc_level, association_level - 1)
class DefaultDiadefGenerator(LocalsVisitor, DiaDefGenerator):
"""Generate minimum diagram definition for the project :
* a package diagram including project's modules
* a class diagram including project's classes
"""
def __init__(self, linker: Linker, handler: DiadefsHandler) -> None:
DiaDefGenerator.__init__(self, linker, handler)
LocalsVisitor.__init__(self)
def visit_project(self, node: Project) -> None:
"""Visit a pyreverse.utils.Project node.
create a diagram definition for packages
"""
mode = self.config.mode
if len(node.modules) > 1:
self.pkgdiagram: PackageDiagram | None = PackageDiagram(
f"packages {node.name}", mode
)
else:
self.pkgdiagram = None
self.classdiagram = ClassDiagram(f"classes {node.name}", mode)
def leave_project(self, _: Project) -> Any:
"""Leave the pyreverse.utils.Project node.
return the generated diagram definition
"""
if self.pkgdiagram:
return self.pkgdiagram, self.classdiagram
return (self.classdiagram,)
def visit_module(self, node: nodes.Module) -> None:
"""Visit an astroid.Module node.
add this class to the package diagram definition
"""
if self.pkgdiagram:
self.linker.visit(node)
self.pkgdiagram.add_object(node.name, node)
def visit_classdef(self, node: nodes.ClassDef) -> None:
"""Visit an astroid.Class node.
add this class to the class diagram definition
"""
anc_level, association_level = self._get_levels()
self.extract_classes(node, anc_level, association_level)
def visit_importfrom(self, node: nodes.ImportFrom) -> None:
"""Visit astroid.ImportFrom and catch modules for package diagram."""
if self.pkgdiagram:
self.pkgdiagram.add_from_depend(node, node.modname)
class ClassDiadefGenerator(DiaDefGenerator):
"""Generate a class diagram definition including all classes related to a
given class.
"""
def class_diagram(self, project: Project, klass: nodes.ClassDef) -> ClassDiagram:
"""Return a class diagram definition for the class and related classes."""
self.classdiagram = ClassDiagram(klass, self.config.mode)
if len(project.modules) > 1:
module, klass = klass.rsplit(".", 1)
module = project.get_module(module)
else:
module = project.modules[0]
klass = klass.split(".")[-1]
klass = next(module.ilookup(klass))
anc_level, association_level = self._get_levels()
self.extract_classes(klass, anc_level, association_level)
return self.classdiagram
# diagram handler #############################################################
class DiadefsHandler:
"""Get diagram definitions from user (i.e. xml files) or generate them."""
def __init__(self, config: argparse.Namespace) -> None:
self.config = config
def get_diadefs(self, project: Project, linker: Linker) -> list[ClassDiagram]:
"""Get the diagram's configuration data.
:param project:The pyreverse project
:type project: pyreverse.utils.Project
:param linker: The linker
:type linker: pyreverse.inspector.Linker(IdGeneratorMixIn, LocalsVisitor)
:returns: The list of diagram definitions
:rtype: list(:class:`pylint.pyreverse.diagrams.ClassDiagram`)
"""
# read and interpret diagram definitions (Diadefs)
diagrams = []
generator = ClassDiadefGenerator(linker, self)
for klass in self.config.classes:
diagrams.append(generator.class_diagram(project, klass))
if not diagrams:
diagrams = DefaultDiadefGenerator(linker, self).visit(project)
for diagram in diagrams:
diagram.extract_relationships()
return diagrams
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