Dropped hyperglot dependency due to licensing.

- Removed SupportedLanguages method as it relies on hyperglot, which is under the GPLv3, to keep gftranslate under Apache 2.0
 - The method is still available as a separate code-snippet (not part of gflanguages itself), and any program using that snippet will need to comply with the GPLv3.
 - For more details, see: https://github.com/googlefonts/fontbakery/pull/3617#issuecomment-1044898812

CHANGELOG.md

@@ -1,5 +1,13 @@
 Below are the most important changes from each release.
 
+## 0.2.0 (2022-Feb-18)
+### Release notes
+  - dropped hyperglot dependency due to licensing. See below.
+  - Removed SupportedLanguages method as it relies on hyperglot, which is under the GPLv3, to keep gftranslate under Apache 2.0
+  - The method is still available as a separate code-snippet (not part of gflanguages itself), and any program using that snippet will need to comply with the GPLv3.
+  - For more details, see: https://github.com/googlefonts/fontbakery/pull/3617#issuecomment-1044898812
+
+
 ## 0.1.1 (2022-Feb-18)
 ### Bugfix
   - updated and simplified the textproto definition to workaround this kind of problem when using the module on projects that also import `fonts_public_pb2.py`: https://github.com/protocolbuffers/protobuf/issues/3002

Lib/gflanguages/lang_support.py

@@ -23,9 +23,7 @@ data on the Google Fonts collection.
 import glob
 import os
 
-from fontTools.ttLib import TTFont
 from google.protobuf import text_format
-from hyperglot import parse as hyperglot_parse
 from pkg_resources import resource_filename
 
 from gflanguages import languages_public_pb2
@@ -33,19 +31,6 @@ from gflanguages import languages_public_pb2
 DATA_DIR = resource_filename("gflanguages", "data")
 
 
-def _ParseFontChars(path):
-    """
-    Open the provided font path and extract the codepoints encoded in the font
-    @return list of characters
-    """
-    font = TTFont(path, lazy=True)
-    cmap = font["cmap"].getBestCmap()
-    font.close()
-
-    # The cmap keys are int codepoints
-    return [chr(c) for c in cmap.keys()]
-
-
 def LoadLanguages(languages_dir=None):
     if languages_dir is None:
         languages_dir = os.path.join(DATA_DIR, 'languages')
@@ -80,33 +65,3 @@ def LoadRegions(regions_dir=None):
             region = text_format.Parse(f.read(), languages_public_pb2.RegionProto())
             regions[region.id] = region
     return regions
-
-
-def SupportedLanguages(font_path, languages=None):
-    """
-    Get languages supported by given font file.
-
-    Languages are pulled from the given set. Based on whether exemplar character
-    sets are present in the given font.
-
-    Logic based on Hyperglot:
-    https://github.com/rosettatype/hyperglot/blob/3172061ca05a62c0ff330eb802a17d4fad8b1a4d/lib/hyperglot/language.py#L273-L301
-    """
-    if languages is None:
-        languages = LoadLanguages()
-
-    chars = _ParseFontChars(font_path)
-
-    supported = []
-    for lang in languages.values():
-        if not lang.HasField('exemplar_chars') or \
-           not lang.exemplar_chars.HasField('base'):
-            continue
-
-        base = hyperglot_parse.parse_chars(lang.exemplar_chars.base,
-                                           decompose=False,
-                                           retainDecomposed=False)
-        if set(base).issubset(chars):
-            supported.append(lang)
-
-    return supported

requirements.txt

@@ -1,5 +1,3 @@
 --index-url https://pypi.python.org/simple/
-fontTools==4.29.1
-hyperglot==0.3.7
 protobuf==3.19.4
 -e .

setup.py

@@ -53,8 +53,6 @@ setup(
     python_requires=">=3.7",
     setup_requires=['setuptools_scm>=4,<6.1'],
     install_requires=[
-        'FontTools',
-        'hyperglot',
         'protobuf',
         'setuptools'
     ]

snippets/supported_languages.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+#
+# Copyright 2022 The Google Fonts Tools Authors.
+# Copyright 2017,2022 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS-IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# =======================================================================
+# =======   This code-snippet uses hyperglot, which is licensed   =======
+# =======   under the GNU GPLv3. So, the resulting license for    =======
+# =======   any program using this snippet will also have to be   =======
+# =======   the GNU GPLv3.                                        =======
+# =======================================================================
+
+from gflanguages.lang_support import LoadLanguages
+from hyperglot import parse as hyperglot_parse
+
+
+def _ParseFontChars(path):
+    """
+    Open the provided font path and extract the codepoints encoded in the font
+    @return list of characters
+    """
+    from fontTools.ttLib import TTFont
+    font = TTFont(path, lazy=True)
+    cmap = font["cmap"].getBestCmap()
+    font.close()
+
+    # The cmap keys are int codepoints
+    return [chr(c) for c in cmap.keys()]
+
+
+def SupportedLanguages(font_path, languages=None):
+    """
+    Get languages supported by given font file.
+
+    Languages are pulled from the given set. Based on whether exemplar character
+    sets are present in the given font.
+
+    Logic based on Hyperglot:
+    https://github.com/rosettatype/hyperglot/blob/3172061ca05a62c0ff330eb802a17d4fad8b1a4d/lib/hyperglot/language.py#L273-L301
+    """
+    if languages is None:
+        languages = LoadLanguages()
+
+    chars = _ParseFontChars(font_path)
+
+    supported = []
+    for lang in languages.values():
+        if not lang.HasField('exemplar_chars') or \
+           not lang.exemplar_chars.HasField('base'):
+            continue
+
+        base = hyperglot_parse.parse_chars(lang.exemplar_chars.base,
+                                           decompose=False,
+                                           retainDecomposed=False)
+        if set(base).issubset(chars):
+            supported.append(lang)
+
+    return supported
+
+
+def portable_path(p):
+    import os
+    return os.path.join(*p.split('/'))
+
+
+def TEST_FILE(f):
+    return portable_path("data/test/" + f)
+
+
+def test_SupportedLanguages():
+    font = TEST_FILE('nunito/Nunito-Regular.ttf')
+    supported = SupportedLanguages(font)
+    langs = [supported[i].name for i, _ in enumerate(supported)]
+    assert len(langs) == 225
+    assert 'Lithuanian' in langs

tests/test_gflanguages_api.py

@@ -1,15 +1,6 @@
-import os
 from gflanguages import lang_support
 
 
-def portable_path(p):
-    return os.path.join(*p.split('/'))
-
-
-def TEST_FILE(f):
-    return portable_path("data/test/" + f)
-
-
 def test_LoadLanguages():
     langs = lang_support.LoadLanguages()
     numerals = langs["yi_Hebr"].exemplar_chars.numerals
@@ -26,11 +17,3 @@ def test_LoadRegions():
     br = regions["BR"]
     assert br.name == 'Brazil'
     assert br.region_group == ['Americas']
-
-
-def test_SupportedLanguages():
-    font = TEST_FILE('nunito/Nunito-Regular.ttf')
-    supported = lang_support.SupportedLanguages(font)
-    langs = [supported[i].name for i, _ in enumerate(supported)]
-    assert len(langs) == 225
-    assert 'Lithuanian' in langs