mirror of
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161 lines
5.5 KiB
Python
161 lines
5.5 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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"""Class to generate files in dot format and image formats supported by Graphviz."""
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from __future__ import annotations
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import os
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import subprocess
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import sys
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import tempfile
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from pathlib import Path
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from astroid import nodes
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from pylint.pyreverse.printer import EdgeType, Layout, NodeProperties, NodeType, Printer
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from pylint.pyreverse.utils import get_annotation_label
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ALLOWED_CHARSETS: frozenset[str] = frozenset(("utf-8", "iso-8859-1", "latin1"))
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SHAPES: dict[NodeType, str] = {
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NodeType.PACKAGE: "box",
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NodeType.INTERFACE: "record",
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NodeType.CLASS: "record",
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}
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ARROWS: dict[EdgeType, dict[str, str]] = {
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EdgeType.INHERITS: dict(arrowtail="none", arrowhead="empty"),
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EdgeType.IMPLEMENTS: dict(arrowtail="node", arrowhead="empty", style="dashed"),
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EdgeType.ASSOCIATION: dict(
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fontcolor="green", arrowtail="none", arrowhead="diamond", style="solid"
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),
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EdgeType.USES: dict(arrowtail="none", arrowhead="open"),
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}
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class DotPrinter(Printer):
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DEFAULT_COLOR = "black"
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def __init__(
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self,
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title: str,
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layout: Layout | None = None,
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use_automatic_namespace: bool | None = None,
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):
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layout = layout or Layout.BOTTOM_TO_TOP
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self.charset = "utf-8"
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super().__init__(title, layout, use_automatic_namespace)
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def _open_graph(self) -> None:
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"""Emit the header lines."""
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self.emit(f'digraph "{self.title}" {{')
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if self.layout:
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self.emit(f"rankdir={self.layout.value}")
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if self.charset:
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assert (
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self.charset.lower() in ALLOWED_CHARSETS
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), f"unsupported charset {self.charset}"
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self.emit(f'charset="{self.charset}"')
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def emit_node(
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self,
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name: str,
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type_: NodeType,
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properties: NodeProperties | None = None,
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) -> None:
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"""Create a new node.
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Nodes can be classes, packages, participants etc.
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"""
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if properties is None:
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properties = NodeProperties(label=name)
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shape = SHAPES[type_]
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color = properties.color if properties.color is not None else self.DEFAULT_COLOR
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style = "filled" if color != self.DEFAULT_COLOR else "solid"
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label = self._build_label_for_node(properties)
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label_part = f', label="{label}"' if label else ""
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fontcolor_part = (
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f', fontcolor="{properties.fontcolor}"' if properties.fontcolor else ""
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)
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self.emit(
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f'"{name}" [color="{color}"{fontcolor_part}{label_part}, shape="{shape}", style="{style}"];'
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)
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def _build_label_for_node(
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self, properties: NodeProperties, is_interface: bool | None = False
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) -> str:
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if not properties.label:
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return ""
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label: str = properties.label
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if is_interface:
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# add a stereotype
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label = "<<interface>>\\n" + label
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if properties.attrs is None and properties.methods is None:
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# return a "compact" form which only displays the class name in a box
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return label
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# Add class attributes
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attrs: list[str] = properties.attrs or []
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label = "{" + label + "|" + r"\l".join(attrs) + r"\l|"
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# Add class methods
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methods: list[nodes.FunctionDef] = properties.methods or []
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for func in methods:
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args = self._get_method_arguments(func)
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label += rf"{func.name}({', '.join(args)})"
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if func.returns:
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label += ": " + get_annotation_label(func.returns)
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label += r"\l"
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label += "}"
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return label
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def emit_edge(
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self,
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from_node: str,
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to_node: str,
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type_: EdgeType,
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label: str | None = None,
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) -> None:
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"""Create an edge from one node to another to display relationships."""
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arrowstyle = ARROWS[type_]
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attrs = [f'{prop}="{value}"' for prop, value in arrowstyle.items()]
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if label:
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attrs.append(f'label="{label}"')
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self.emit(f'"{from_node}" -> "{to_node}" [{", ".join(sorted(attrs))}];')
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def generate(self, outputfile: str) -> None:
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self._close_graph()
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graphviz_extensions = ("dot", "gv")
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name = self.title
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if outputfile is None:
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target = "png"
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pdot, dot_sourcepath = tempfile.mkstemp(".gv", name)
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ppng, outputfile = tempfile.mkstemp(".png", name)
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os.close(pdot)
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os.close(ppng)
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else:
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target = Path(outputfile).suffix.lstrip(".")
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if not target:
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target = "png"
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outputfile = outputfile + "." + target
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if target not in graphviz_extensions:
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pdot, dot_sourcepath = tempfile.mkstemp(".gv", name)
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os.close(pdot)
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else:
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dot_sourcepath = outputfile
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with open(dot_sourcepath, "w", encoding="utf8") as outfile:
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outfile.writelines(self.lines)
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if target not in graphviz_extensions:
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use_shell = sys.platform == "win32"
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subprocess.call(
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["dot", "-T", target, dot_sourcepath, "-o", outputfile],
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shell=use_shell,
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)
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os.unlink(dot_sourcepath)
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def _close_graph(self) -> None:
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"""Emit the lines needed to properly close the graph."""
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self.emit("}\n")
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