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Simplify generate_fontconfig_pattern. #24303

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merged 1 commit into from
Nov 1, 2022
Merged

Simplify generate_fontconfig_pattern. #24303

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50 changes: 13 additions & 37 deletions lib/matplotlib/_fontconfig_pattern.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,6 @@
from functools import lru_cache, partial
import re

import numpy as np
from pyparsing import (
Optional, ParseException, Regex, StringEnd, Suppress, ZeroOrMore)

Expand All @@ -21,16 +20,17 @@

family_punc = r'\\\-:,'
_family_unescape = partial(re.compile(r'\\(?=[%s])' % family_punc).sub, '')
family_escape = re.compile(r'([%s])' % family_punc).sub

_family_escape = partial(re.compile(r'(?=[%s])' % family_punc).sub, r'\\')
value_punc = r'\\=_:,'
_value_unescape = partial(re.compile(r'\\(?=[%s])' % value_punc).sub, '')
value_escape = re.compile(r'([%s])' % value_punc).sub
_value_escape = partial(re.compile(r'(?=[%s])' % value_punc).sub, r'\\')

# Remove after module deprecation elapses (3.8); then remove underscores
# from _family_unescape and _value_unescape.
# from _{family,value}_{un,}escape.
family_unescape = re.compile(r'\\([%s])' % family_punc).sub
value_unescape = re.compile(r'\\([%s])' % value_punc).sub
family_escape = re.compile(r'([%s])' % family_punc).sub
value_escape = re.compile(r'([%s])' % value_punc).sub


class FontconfigPatternParser:
Expand Down Expand Up @@ -127,36 +127,12 @@ def parse(self, pattern):
parse_fontconfig_pattern = lru_cache()(FontconfigPatternParser().parse)


def _escape_val(val, escape_func):
"""
Given a string value or a list of string values, run each value through
the input escape function to make the values into legal font config
strings. The result is returned as a string.
"""
if not np.iterable(val) or isinstance(val, str):
val = [val]

return ','.join(escape_func(r'\\\1', str(x)) for x in val
if x is not None)


def generate_fontconfig_pattern(d):
"""
Given a dictionary of key/value pairs, generates a fontconfig
pattern string.
"""
props = []

# Family is added first w/o a keyword
family = d.get_family()
if family is not None and family != []:
props.append(_escape_val(family, family_escape))

# The other keys are added as key=value
for key in ['style', 'variant', 'weight', 'stretch', 'file', 'size']:
val = getattr(d, 'get_' + key)()
# Don't use 'if not val' because 0 is a valid input.
if val is not None and val != []:
props.append(":%s=%s" % (key, _escape_val(val, value_escape)))

return ''.join(props)
"""Convert a `.FontProperties` to a fontconfig pattern string."""
kvs = [(k, getattr(d, f"get_{k}")())
for k in ["style", "variant", "weight", "stretch", "file", "size"]]
# Families is given first without a leading keyword. Other entries (which
# are necessarily scalar) are given as key=value, skipping Nones.
return (",".join(_family_escape(f) for f in d.get_family())
+ "".join(f":{k}={_value_escape(str(v))}"
for k, v in kvs if v is not None))