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# Copyright (c) 2003-2016 LOGILAB S.A. (Paris, FRANCE).
# http://www.logilab.fr/ -- mailto:contact@logilab.fr
# 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 os.path as osp
import os
import sys
import tempfile
import codecs
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(object):
"""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, dotfile=None, mapfile=None):
"""Generates a graph file.
:param str outputfile: filename and path [defaults to graphname.png]
:param str dotfile: filename and path [defaults to graphname.dot]
:param str mapfile: filename and path
:rtype: str
:return: a path to the generated file
"""
import subprocess # introduced in py 2.4
name = self.graphname
if not dotfile:
# if 'outputfile' is a dot file use it as 'dotfile'
if outputfile and outputfile.endswith(".dot"):
dotfile = outputfile
else:
dotfile = '%s.dot' % name
if outputfile is not None:
storedir, _, target = target_info_from_filename(outputfile)
if target != "dot":
pdot, dot_sourcepath = tempfile.mkstemp(".dot", name)
os.close(pdot)
else:
dot_sourcepath = osp.join(storedir, dotfile)
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 http://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 http://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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