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# Copyright (c) 2015-2018, 2020 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2015 Florian Bruhin <me@the-compiler.org>
# Copyright (c) 2016 Ashley Whetter <ashley@awhetter.co.uk>
# Copyright (c) 2018 ssolanki <sushobhitsolanki@gmail.com>
# Copyright (c) 2019, 2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2019 Nick Drozd <nicholasdrozd@gmail.com>
# Copyright (c) 2020 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2020 Damien Baty <damien.baty@polyconseil.fr>
# Copyright (c) 2020 谭九鼎 <109224573@qq.com>
# Copyright (c) 2020 Benjamin Graham <benwilliamgraham@gmail.com>
# Copyright (c) 2021 Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
# Copyright (c) 2021 Marc Mueller <30130371+cdce8p@users.noreply.github.com>
# Copyright (c) 2021 Andreas Finkler <andi.finkler@gmail.com>
# Copyright (c) 2021 Andrew Howe <howeaj@users.noreply.github.com>
# 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
"""Graph manipulation utilities.
(dot generation adapted from pypy/translator/tool/make_dot.py)
"""
import codecs
import os
import shutil
import subprocess
import sys
import tempfile
from typing import Optional
def target_info_from_filename(filename):
"""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 backend."""
def __init__(
self,
graphname,
rankdir=None,
size=None,
ratio=None,
charset="utf-8",
renderer="dot",
additional_param=None,
):
if additional_param is None:
additional_param = {}
self.graphname = graphname
self.renderer = renderer
self.lines = []
self._source = 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):
"""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: Optional[str] = None, mapfile: Optional[str] = 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
"""
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."
)
use_shell = sys.platform == "win32"
if mapfile:
subprocess.call(
[
self.renderer,
"-Tcmapx",
"-o",
mapfile,
"-T",
target,
dot_sourcepath,
"-o",
outputfile,
],
shell=use_shell,
)
else:
subprocess.call(
[self.renderer, "-T", target, dot_sourcepath, "-o", outputfile],
shell=use_shell,
)
os.unlink(dot_sourcepath)
return outputfile
def emit(self, line):
"""Adds <line> to final output."""
self.lines.append(line)
def emit_edge(self, name1, name2, **props):
"""emit an edge from <name1> to <name2>.
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, **props):
"""emit a node with given properties.
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):
"""Returns a suitable DOT node id for `nid`."""
return f'"{nid}"'
def get_cycles(graph_dict, vertices=None):
"""given a dictionary representing an ordered graph (i.e. key are vertices
and values is a list of destination vertices representing edges), return a
list of detected cycles
"""
if not graph_dict:
return ()
result = []
if vertices is None:
vertices = graph_dict.keys()
for vertice in vertices:
_get_cycles(graph_dict, [], set(), result, vertice)
return result
def _get_cycles(graph_dict, path, visited, result, vertice):
"""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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