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88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright 2022 The Google Fonts Tools Authors.
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# Copyright 2017,2022 Google LLC All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS-IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# =======================================================================
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# ======= This code-snippet uses hyperglot, which is licensed =======
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# ======= under the GNU GPLv3. So, the resulting license for =======
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# ======= any program using this snippet will also have to be =======
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# ======= the GNU GPLv3. =======
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# =======================================================================
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from gflanguages import LoadLanguages
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from hyperglot import parse as hyperglot_parse
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def _ParseFontChars(path):
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"""
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Open the provided font path and extract the codepoints encoded in the font
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@return list of characters
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"""
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from fontTools.ttLib import TTFont
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font = TTFont(path, lazy=True)
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cmap = font["cmap"].getBestCmap()
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font.close()
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# The cmap keys are int codepoints
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return [chr(c) for c in cmap.keys()]
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def SupportedLanguages(font_path, languages=None):
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"""
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Get languages supported by given font file.
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Languages are pulled from the given set. Based on whether exemplar character
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sets are present in the given font.
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Logic based on Hyperglot:
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https://github.com/rosettatype/hyperglot/blob/3172061ca05a62c0ff330eb802a17d4fad8b1a4d/lib/hyperglot/language.py#L273-L301
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"""
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if languages is None:
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languages = LoadLanguages()
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chars = _ParseFontChars(font_path)
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supported = []
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for lang in languages.values():
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if not lang.HasField('exemplar_chars') or \
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not lang.exemplar_chars.HasField('base'):
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continue
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base = hyperglot_parse.parse_chars(lang.exemplar_chars.base,
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decompose=False,
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retainDecomposed=False)
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if set(base).issubset(chars):
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supported.append(lang)
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return supported
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def portable_path(p):
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import os
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return os.path.join(*p.split('/'))
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def TEST_FILE(f):
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return portable_path("data/test/" + f)
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def test_SupportedLanguages():
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font = TEST_FILE('nunito/Nunito-Regular.ttf')
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supported = SupportedLanguages(font)
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langs = [supported[i].name for i, _ in enumerate(supported)]
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assert len(langs) == 225
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assert 'Lithuanian' in langs
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