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Convert _math_style_dict into an Enum. #18555

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Merged
merged 1 commit into from
Sep 25, 2020
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Convert _math_style_dict into an Enum. #18555

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23 changes: 13 additions & 10 deletions lib/matplotlib/_mathtext.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
"""

from collections import namedtuple
import enum
import functools
from io import StringIO
import logging
Expand Down Expand Up @@ -1944,8 +1945,11 @@ class Parser:
The grammar is based directly on that in TeX, though it cuts a few corners.
"""

_math_style_dict = dict(displaystyle=0, textstyle=1,
scriptstyle=2, scriptscriptstyle=3)
class _MathStyle(enum.Enum):
DISPLAYSTYLE = enum.auto()
TEXTSTYLE = enum.auto()
SCRIPTSTYLE = enum.auto()
SCRIPTSCRIPTSTYLE = enum.auto()

Comment on lines +1951 to 1953
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Where are these two used?

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Hmm, apparently nowhere. My guess is they were defined for compatibility with TeX, but never implemented. Looking at commit messages of #8151, I think that was the author's goal but maybe never got back to it.

_binary_operators = set('''
+ * -
Expand Down Expand Up @@ -2798,8 +2802,7 @@ def _genfrac(self, ldelim, rdelim, rule, style, num, den):

rule = float(rule)

# If style != displaystyle == 0, shrink the num and den
if style != self._math_style_dict['displaystyle']:
if style is not self._MathStyle.DISPLAYSTYLE:
num.shrink()
den.shrink()
cnum = HCentered([num])
Expand Down Expand Up @@ -2848,8 +2851,8 @@ def frac(self, s, loc, toks):
state.font, state.fontsize, state.dpi)
num, den = toks[0]

return self._genfrac('', '', thickness,
self._math_style_dict['textstyle'], num, den)
return self._genfrac('', '', thickness, self._MathStyle.TEXTSTYLE,
num, den)

def dfrac(self, s, loc, toks):
assert len(toks) == 1
Expand All @@ -2860,16 +2863,16 @@ def dfrac(self, s, loc, toks):
state.font, state.fontsize, state.dpi)
num, den = toks[0]

return self._genfrac('', '', thickness,
self._math_style_dict['displaystyle'], num, den)
return self._genfrac('', '', thickness, self._MathStyle.DISPLAYSTYLE,
num, den)

def binom(self, s, loc, toks):
assert len(toks) == 1
assert len(toks[0]) == 2
num, den = toks[0]

return self._genfrac('(', ')', 0.0,
self._math_style_dict['textstyle'], num, den)
return self._genfrac('(', ')', 0.0, self._MathStyle.TEXTSTYLE,
num, den)

def sqrt(self, s, loc, toks):
root, body = toks[0]
Expand Down