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# Copyright (c) 2015-2018 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 Nick Drozd <nicholasdrozd@gmail.com>
# Copyright (c) 2019 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2020 Benjamin Graham <benwilliamgraham@gmail.com>
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
"""Graph manipulation utilities.
(dot generation adapted from pypy/translator/tool/make_dot.py)
"""
import codecs
import os
import subprocess
import sys
import tempfile
from os import path as osp
def target_info_from_filename(filename):
"""Transforms /some/path/foo.png into ('/some/path', 'foo.png', 'png')."""
basename = osp.basename(filename)
storedir = osp.dirname(osp.abspath(filename))
target = filename.split(".")[-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("digraph %s {" % normalize_node_id(graphname))
if rankdir:
self.emit("rankdir=%s" % rankdir)
if ratio:
self.emit("ratio=%s" % ratio)
if size:
self.emit('size="%s"' % size)
if charset:
assert charset.lower() in ("utf-8", "iso-8859-1", "latin1"), (
"unsupported charset %s" % charset
)
self.emit('charset="%s"' % 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=None, mapfile=None):
"""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
"""
name = self.graphname
if outputfile is not None:
_, _, target = target_info_from_filename(outputfile)
if target != "dot":
pdot, dot_sourcepath = tempfile.mkstemp(".dot", name)
os.close(pdot)
else:
dot_sourcepath = outputfile
else:
target = "png"
pdot, dot_sourcepath = tempfile.mkstemp(".dot", name)
ppng, outputfile = tempfile.mkstemp(".png", name)
os.close(pdot)
os.close(ppng)
pdot = codecs.open(dot_sourcepath, "w", encoding="utf8")
pdot.write(self.source)
pdot.close()
if target != "dot":
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 = ['%s="%s"' % (prop, value) for prop, value in props.items()]
n_from, n_to = normalize_node_id(name1), normalize_node_id(name2)
self.emit("%s -> %s [%s];" % (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 = ['%s="%s"' % (prop, value) for prop, value in props.items()]
self.emit("%s [%s];" % (normalize_node_id(name), ", ".join(sorted(attrs))))
def normalize_node_id(nid):
"""Returns a suitable DOT node id for `nid`."""
return '"%s"' % 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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