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python: LRU cache for the dot->svg conversion

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* wrap/python/spot.py: Here.
This commit is contained in:
Alexandre Duret-Lutz 2015-04-01 14:44:10 +02:00
parent 31b3862f48
commit 54a8ce502d
1 changed files with 11 additions and 2 deletions
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13
wrap/python/spot.py
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@ -20,17 +20,26 @@
from spot_impl import * from spot_impl import *
import subprocess import subprocess
import sys import sys
from functools import lru_cache
# Global BDD dict so that we do not have to create one in user code.
_bdd_dict = make_bdd_dict() _bdd_dict = make_bdd_dict()
def _ostream_to_svg(ostr): # Add a small LRU cache so that when we display automata into a
# interactive widget, we avoid some repeated calls to dot for
# identical inputs.
@lru_cache(maxsize=64)
def _str_to_svg(str):
dotty = subprocess.Popen(['dot', '-Tsvg'], dotty = subprocess.Popen(['dot', '-Tsvg'],
stdin=subprocess.PIPE, stdin=subprocess.PIPE,
stdout=subprocess.PIPE) stdout=subprocess.PIPE)
dotty.stdin.write(ostr.str().encode('utf-8')) dotty.stdin.write(str)
res = dotty.communicate() res = dotty.communicate()
return res[0].decode('utf-8') return res[0].decode('utf-8')
def _ostream_to_svg(ostr):
return _str_to_svg(ostr.str().encode('utf-8'))
def _render_automaton_as_svg(a, opt=None): def _render_automaton_as_svg(a, opt=None):
ostr = ostringstream() ostr = ostringstream()
dotty_reachable(ostr, a, opt) dotty_reachable(ostr, a, opt)