1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
# 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 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/master/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
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("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: str = None, mapfile: 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
pdot = codecs.open(dot_sourcepath, "w", encoding="utf8") # type: ignore
pdot.write(self.source) # type: ignore
pdot.close() # type: ignore
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("{} -> {} [{}];".format(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("{} [{}];".format(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()
|
