Add font_fallback.xml generator script
This script is not used in production yet.
These scripts are tested in unittest.
Test: atest frameworks/base/data/fonts/script/test
Bug: 360820050
Flag: EXEMPT Build infra and tools
Change-Id: Ibe6f6d3a7245949f38465766b83e36421dd3f59f
diff --git a/data/fonts/script/alias_builder.py b/data/fonts/script/alias_builder.py
new file mode 100755
index 0000000..cfc5d67
--- /dev/null
+++ b/data/fonts/script/alias_builder.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+#
+# Copyright (C) 2024 The Android Open Source Project
+#
+# 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.
+#
+
+"""Build Alias instance with validating JSON contents."""
+
+import dataclasses
+
+from custom_json import _load_json_with_comment
+from validators import check_str
+from validators import check_weight_or_none
+
+
+@dataclasses.dataclass
+class Alias:
+ name: str
+ to: str
+ weight: int | None
+
+
+_ALIAS_KEYS = set(["name", "to", "weight"])
+
+
+def parse_alias(obj) -> Alias:
+ """Convert given dict object to Alias instance."""
+ unknown_keys = obj.keys() - _ALIAS_KEYS
+ assert not unknown_keys, "Unknown keys found: %s" % unknown_keys
+ alias = Alias(
+ name=check_str(obj, "name"),
+ to=check_str(obj, "to"),
+ weight=check_weight_or_none(obj, "weight"),
+ )
+
+ assert alias.name != alias.to, "name and to must not be equal"
+
+ return alias
+
+
+def parse_alias_from_json(json_str) -> Alias:
+ """For testing purposes."""
+ return parse_alias(_load_json_with_comment(json_str))
+
+
+def parse_aliases(objs) -> [Alias]:
+ assert isinstance(objs, list), "aliases must be list"
+ return [parse_alias(obj) for obj in objs]
+
+
+def parse_aliases_from_json(json_str) -> [Alias]:
+ return parse_aliases(_load_json_with_comment(json_str))