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Convert dviread to use lru_cache. #9646

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Merged
merged 1 commit into from
Nov 1, 2017
+11 −23
Merged

Convert dviread to use lru_cache. #9646

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34 changes: 11 additions & 23 deletions lib/matplotlib/dviread.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,11 @@
import textwrap
import os

try:
from functools import lru_cache
except ImportError: # Py2
from backports.functools_lru_cache import lru_cache

if six.PY3:
def ord(x):
return x
Expand Down Expand Up @@ -1056,36 +1061,19 @@ def find_tex_file(filename, format=None):
'debug')
return result.decode('ascii')


# With multiple text objects per figure (e.g., tick labels) we may end
# up reading the same tfm and vf files many times, so we implement a
# simple cache. TODO: is this worth making persistent?

_tfmcache = {}
_vfcache = {}


def _fontfile(texname, class_, suffix, cache):
try:
return cache[texname]
except KeyError:
pass

@lru_cache()
def _fontfile(cls, suffix, texname):
filename = find_tex_file(texname + suffix)
if filename:
result = class_(filename)
else:
result = None

cache[texname] = result
return result


def _tfmfile(texname):
return _fontfile(texname, Tfm, '.tfm', _tfmcache)
return cls(filename) if filename else None


def _vffile(texname):
return _fontfile(texname, Vf, '.vf', _vfcache)
_tfmfile = partial(_fontfile, Tfm, ".tfm")
_vffile = partial(_fontfile, Vf, ".vf")


if __name__ == '__main__':
Expand Down