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vcg_printer.py
# 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 """Functions to generate files readable with George Sander's vcg (Visualization of Compiler Graphs). You can download vcg at https://rw4.cs.uni-sb.de/~sander/html/gshome.html Note that vcg exists as a debian package. See vcg's documentation for explanation about the different values that maybe used for the functions parameters. """ from __future__ import annotations from collections.abc import Mapping from typing import Any from pylint.pyreverse.printer import EdgeType, Layout, NodeProperties, NodeType, Printer ATTRS_VAL = { "algos": ( "dfs", "tree", "minbackward", "left_to_right", "right_to_left", "top_to_bottom", "bottom_to_top", "maxdepth", "maxdepthslow", "mindepth", "mindepthslow", "mindegree", "minindegree", "minoutdegree", "maxdegree", "maxindegree", "maxoutdegree", ), "booleans": ("yes", "no"), "colors": ( "black", "white", "blue", "red", "green", "yellow", "magenta", "lightgrey", "cyan", "darkgrey", "darkblue", "darkred", "darkgreen", "darkyellow", "darkmagenta", "darkcyan", "gold", "lightblue", "lightred", "lightgreen", "lightyellow", "lightmagenta", "lightcyan", "lilac", "turquoise", "aquamarine", "khaki", "purple", "yellowgreen", "pink", "orange", "orchid", ), "shapes": ("box", "ellipse", "rhomb", "triangle"), "textmodes": ("center", "left_justify", "right_justify"), "arrowstyles": ("solid", "line", "none"), "linestyles": ("continuous", "dashed", "dotted", "invisible"), } # meaning of possible values: # O -> string # 1 -> int # list -> value in list GRAPH_ATTRS = { "title": 0, "label": 0, "color": ATTRS_VAL["colors"], "textcolor": ATTRS_VAL["colors"], "bordercolor": ATTRS_VAL["colors"], "width": 1, "height": 1, "borderwidth": 1, "textmode": ATTRS_VAL["textmodes"], "shape": ATTRS_VAL["shapes"], "shrink": 1, "stretch": 1, "orientation": ATTRS_VAL["algos"], "vertical_order": 1, "horizontal_order": 1, "xspace": 1, "yspace": 1, "layoutalgorithm": ATTRS_VAL["algos"], "late_edge_labels": ATTRS_VAL["booleans"], "display_edge_labels": ATTRS_VAL["booleans"], "dirty_edge_labels": ATTRS_VAL["booleans"], "finetuning": ATTRS_VAL["booleans"], "manhattan_edges": ATTRS_VAL["booleans"], "smanhattan_edges": ATTRS_VAL["booleans"], "port_sharing": ATTRS_VAL["booleans"], "edges": ATTRS_VAL["booleans"], "nodes": ATTRS_VAL["booleans"], "splines": ATTRS_VAL["booleans"], } NODE_ATTRS = { "title": 0, "label": 0, "color": ATTRS_VAL["colors"], "textcolor": ATTRS_VAL["colors"], "bordercolor": ATTRS_VAL["colors"], "width": 1, "height": 1, "borderwidth": 1, "textmode": ATTRS_VAL["textmodes"], "shape": ATTRS_VAL["shapes"], "shrink": 1, "stretch": 1, "vertical_order": 1, "horizontal_order": 1, } EDGE_ATTRS = { "sourcename": 0, "targetname": 0, "label": 0, "linestyle": ATTRS_VAL["linestyles"], "class": 1, "thickness": 0, "color": ATTRS_VAL["colors"], "textcolor": ATTRS_VAL["colors"], "arrowcolor": ATTRS_VAL["colors"], "backarrowcolor": ATTRS_VAL["colors"], "arrowsize": 1, "backarrowsize": 1, "arrowstyle": ATTRS_VAL["arrowstyles"], "backarrowstyle": ATTRS_VAL["arrowstyles"], "textmode": ATTRS_VAL["textmodes"], "priority": 1, "anchor": 1, "horizontal_order": 1, } SHAPES: dict[NodeType, str] = { NodeType.PACKAGE: "box", NodeType.CLASS: "box", NodeType.INTERFACE: "ellipse", } # pylint: disable-next=consider-using-namedtuple-or-dataclass ARROWS: dict[EdgeType, dict[str, str | int]] = { EdgeType.USES: { "arrowstyle": "solid", "backarrowstyle": "none", "backarrowsize": 0, }, EdgeType.INHERITS: { "arrowstyle": "solid", "backarrowstyle": "none", "backarrowsize": 10, }, EdgeType.IMPLEMENTS: { "arrowstyle": "solid", "backarrowstyle": "none", "linestyle": "dotted", "backarrowsize": 10, }, EdgeType.ASSOCIATION: { "arrowstyle": "solid", "backarrowstyle": "none", "textcolor": "green", }, EdgeType.AGGREGATION: { "arrowstyle": "solid", "backarrowstyle": "none", "textcolor": "green", }, } ORIENTATION: dict[Layout, str] = { Layout.LEFT_TO_RIGHT: "left_to_right", Layout.RIGHT_TO_LEFT: "right_to_left", Layout.TOP_TO_BOTTOM: "top_to_bottom", Layout.BOTTOM_TO_TOP: "bottom_to_top", } # Misc utilities ############################################################### class VCGPrinter(Printer): def _open_graph(self) -> None: """Emit the header lines.""" self.emit("graph:{\n") self._inc_indent() self._write_attributes( GRAPH_ATTRS, title=self.title, layoutalgorithm="dfs", late_edge_labels="yes", port_sharing="no", manhattan_edges="yes", ) if self.layout: self._write_attributes(GRAPH_ATTRS, orientation=ORIENTATION[self.layout]) def _close_graph(self) -> None: """Emit the lines needed to properly close the graph.""" self._dec_indent() self.emit("}") def emit_node( self, name: str, type_: NodeType, properties: NodeProperties | None = None, ) -> None: """Create a new node. Nodes can be classes, packages, participants etc. """ if properties is None: properties = NodeProperties(label=name) elif properties.label is None: properties.label = name self.emit(f'node: {{title:"{name}"', force_newline=False) self._write_attributes( NODE_ATTRS, label=self._build_label_for_node(properties), shape=SHAPES[type_], ) self.emit("}") @staticmethod def _build_label_for_node(properties: NodeProperties) -> str: fontcolor = "\f09" if properties.fontcolor == "red" else "" label = rf"\fb{fontcolor}{properties.label}\fn" if properties.attrs is None and properties.methods is None: # return a compact form which only displays the classname in a box return label attrs = properties.attrs or [] methods = properties.methods or [] method_names = [func.name for func in methods] # box width for UML like diagram maxlen = max(len(name) for name in [properties.label] + method_names + attrs) line = "_" * (maxlen + 2) label = rf"{label}\n\f{line}" for attr in attrs: label = rf"{label}\n\f08{attr}" if attrs: label = rf"{label}\n\f{line}" for func in method_names: label = rf"{label}\n\f10{func}()" return label def emit_edge( self, from_node: str, to_node: str, type_: EdgeType, label: str | None = None, ) -> None: """Create an edge from one node to another to display relationships.""" self.emit( f'edge: {{sourcename:"{from_node}" targetname:"{to_node}"', force_newline=False, ) attributes = ARROWS[type_] if label: attributes["label"] = label self._write_attributes( EDGE_ATTRS, **attributes, ) self.emit("}") def _write_attributes( self, attributes_dict: Mapping[str, Any], **args: Any ) -> None: """Write graph, node or edge attributes.""" for key, value in args.items(): try: _type = attributes_dict[key] except KeyError as e: raise AttributeError( f"no such attribute {key}\npossible attributes are {attributes_dict.keys()}" ) from e if not _type: self.emit(f'{key}:"{value}"\n') elif _type == 1: self.emit(f"{key}:{int(value)}\n") elif value in _type: self.emit(f"{key}:{value}\n") else: raise ValueError( f"value {value} isn't correct for attribute {key} correct values are {type}" )
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