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graph.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 """Graph manipulation utilities. (dot generation adapted from pypy/translator/tool/make_dot.py) """ from __future__ import annotations import codecs import os import shutil import subprocess import tempfile from collections.abc import Sequence from typing import Any def target_info_from_filename(filename: str) -> tuple[str, str, str]: """Transforms /some/path/foo.png into ('/some/path', 'foo.png', 'png').""" basename = os.path.basename(filename) storedir = os.path.dirname(os.path.abspath(filename)) target = os.path.splitext(filename)[-1][1:] return storedir, basename, target class DotBackend: """Dot File back-end.""" def __init__( self, graphname: str, rankdir: str | None = None, size: Any = None, ratio: Any = None, charset: str = "utf-8", renderer: str = "dot", additional_param: dict[str, Any] | None = None, ) -> None: if additional_param is None: additional_param = {} self.graphname = graphname self.renderer = renderer self.lines: list[str] = [] self._source: str | None = None self.emit(f"digraph {normalize_node_id(graphname)} {{") if rankdir: self.emit(f"rankdir={rankdir}") if ratio: self.emit(f"ratio={ratio}") if size: self.emit(f'size="{size}"') if charset: assert charset.lower() in { "utf-8", "iso-8859-1", "latin1", }, f"unsupported charset {charset}" self.emit(f'charset="{charset}"') for param in additional_param.items(): self.emit("=".join(param)) def get_source(self) -> str: """Returns self._source.""" if self._source is None: self.emit("}\n") self._source = "\n".join(self.lines) del self.lines return self._source source = property(get_source) def generate( self, outputfile: str | None = None, mapfile: str | None = None ) -> str: """Generates a graph file. :param str outputfile: filename and path [defaults to graphname.png] :param str mapfile: filename and path :rtype: str :return: a path to the generated file :raises RuntimeError: if the executable for rendering was not found """ # pylint: disable=duplicate-code graphviz_extensions = ("dot", "gv") name = self.graphname if outputfile is None: target = "png" pdot, dot_sourcepath = tempfile.mkstemp(".gv", name) ppng, outputfile = tempfile.mkstemp(".png", name) os.close(pdot) os.close(ppng) else: _, _, target = target_info_from_filename(outputfile) if not target: target = "png" outputfile = outputfile + "." + target if target not in graphviz_extensions: pdot, dot_sourcepath = tempfile.mkstemp(".gv", name) os.close(pdot) else: dot_sourcepath = outputfile with codecs.open(dot_sourcepath, "w", encoding="utf8") as file: file.write(self.source) if target not in graphviz_extensions: if shutil.which(self.renderer) is None: raise RuntimeError( f"Cannot generate `{outputfile}` because '{self.renderer}' " "executable not found. Install graphviz, or specify a `.gv` " "outputfile to produce the DOT source code." ) if mapfile: subprocess.run( [ self.renderer, "-Tcmapx", "-o", mapfile, "-T", target, dot_sourcepath, "-o", outputfile, ], check=True, ) else: subprocess.run( [self.renderer, "-T", target, dot_sourcepath, "-o", outputfile], check=True, ) os.unlink(dot_sourcepath) return outputfile def emit(self, line: str) -> None: """Adds <line> to final output.""" self.lines.append(line) def emit_edge(self, name1: str, name2: str, **props: Any) -> None: """Emit an edge from <name1> to <name2>. For edge properties: see https://www.graphviz.org/doc/info/attrs.html """ attrs = [f'{prop}="{value}"' for prop, value in props.items()] n_from, n_to = normalize_node_id(name1), normalize_node_id(name2) self.emit(f"{n_from} -> {n_to} [{', '.join(sorted(attrs))}];") def emit_node(self, name: str, **props: Any) -> None: """Emit a node with given properties. For node properties: see https://www.graphviz.org/doc/info/attrs.html """ attrs = [f'{prop}="{value}"' for prop, value in props.items()] self.emit(f"{normalize_node_id(name)} [{', '.join(sorted(attrs))}];") def normalize_node_id(nid: str) -> str: """Returns a suitable DOT node id for `nid`.""" return f'"{nid}"' def get_cycles( graph_dict: dict[str, set[str]], vertices: list[str] | None = None ) -> Sequence[list[str]]: """Return a list of detected cycles based on an ordered graph (i.e. keys are vertices and values are lists of destination vertices representing edges). """ if not graph_dict: return () result: list[list[str]] = [] if vertices is None: vertices = list(graph_dict.keys()) for vertice in vertices: _get_cycles(graph_dict, [], set(), result, vertice) return result def _get_cycles( graph_dict: dict[str, set[str]], path: list[str], visited: set[str], result: list[list[str]], vertice: str, ) -> None: """Recursive function doing the real work for get_cycles.""" if vertice in path: cycle = [vertice] for node in path[::-1]: if node == vertice: break cycle.insert(0, node) # make a canonical representation start_from = min(cycle) index = cycle.index(start_from) cycle = cycle[index:] + cycle[0:index] # append it to result if not already in if cycle not in result: result.append(cycle) return path.append(vertice) try: for node in graph_dict[vertice]: # don't check already visited nodes again if node not in visited: _get_cycles(graph_dict, path, visited, result, node) visited.add(node) except KeyError: pass path.pop()
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