44a79b1b89
See https://gitlab.com/graphviz/graphviz/issues/1605. * python/spot/aux.py (str_to_svg): Invert the scale parameters if they are both greater than one.
119 lines
3.6 KiB
Python
119 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2016, 2019 Laboratoire de Recherche et Développement de l'Epita
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# (LRDE).
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#
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# This file is part of Spot, a model checking library.
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#
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# Spot is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Spot is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Auxiliary functions for Spot's Python bindings
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"""
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from functools import lru_cache
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import subprocess
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import sys
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import os
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import errno
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import contextlib
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import re
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def extend(*classes):
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"""
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Decorator that extends all the given classes with the contents
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of the class currently being defined.
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"""
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def wrap(this):
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for cls in classes:
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for (name, val) in this.__dict__.items():
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if name not in ('__dict__', '__weakref__') \
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and not (name == '__doc__' and val is None):
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setattr(cls, name, val)
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return classes[0]
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return wrap
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# Work around a bug introduced in GraphViz 2.42.x, where the scale
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# parameter is inverted. https://gitlab.com/graphviz/graphviz/issues/1605
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# In our case, the scale parameters should both be <= 1, so we can
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# detect when that is not the case.
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svgscale_regex = re.compile('transform="scale\(([\d.]+) ([\d.]+)\) rotate')
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def _gvfix(matchobj):
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xs = float(matchobj.group(1))
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ys = float(matchobj.group(2))
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if xs >= 1 and ys >= 1:
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xs = 1/xs
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ys = 1/ys
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return 'transform="scale({} {}) rotate'.format(xs, ys)
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# Add a small LRU cache so that when we display automata into a
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# interactive widget, we avoid some repeated calls to dot for
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# identical inputs.
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@lru_cache(maxsize=64)
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def str_to_svg(str):
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"""
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Send some text to dot for conversion to SVG.
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"""
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try:
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dot = subprocess.Popen(['dot', '-Tsvg'],
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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except FileNotFoundError:
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print("The command 'dot' seems to be missing on your system.\n"
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"Please install the GraphViz package "
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"and make sure 'dot' is in your PATH.", file=sys.stderr)
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raise
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stdout, stderr = dot.communicate(str)
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if stderr:
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print("Calling 'dot' for the conversion to SVG produced the message:\n"
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+ stderr.decode('utf-8'), file=sys.stderr)
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ret = dot.wait()
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if ret:
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raise subprocess.CalledProcessError(ret, 'dot')
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out = stdout.decode('utf-8')
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return svgscale_regex.sub(_gvfix, out)
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def ostream_to_svg(ostr):
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"""
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Encode an ostringstream as utf-8 and send it to dot for cocnversion to SVG.
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"""
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return str_to_svg(ostr.str().encode('utf-8'))
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def rm_f(filename):
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"""
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Remove filename if it exists.
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"""
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try:
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os.remove(filename)
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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@contextlib.contextmanager
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def tmpdir():
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cwd = os.getcwd()
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tmpdir = os.environ.get('SPOT_TMPDIR') or os.environ.get('TMPDIR') or '.'
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try:
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os.chdir(tmpdir)
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yield
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finally:
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os.chdir(cwd)
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