[natural_translit] Add new Phon class. Add vowels and pulmonic conson…

…ants with dedicated IPA symbols to the multilingual Phon inventory. The default phonological features are derived from the location of the phoneme on the IPA table.

PiperOrigin-RevId: 718116084

nisaba/scripts/natural_translit/phonology/BUILD.bazel

@@ -83,6 +83,30 @@ py_library(
     ],
 )
 
+py_library(
+    name = "phonological_symbol",
+    srcs = ["phonological_symbol.py"],
+    deps = [
+        ":descriptive_features",
+        "//nisaba/scripts/natural_translit/utils:expression",
+        "//nisaba/scripts/natural_translit/utils:feature",
+        "//nisaba/scripts/natural_translit/utils:inventory",
+        "//nisaba/scripts/natural_translit/utils:symbol",
+        "//nisaba/scripts/natural_translit/utils:type_op",
+    ],
+)
+
+py_test(
+    name = "phonological_symbol_test",
+    srcs = ["phonological_symbol_test.py"],
+    main = "phonological_symbol_test.py",
+    deps = [
+        ":phonological_symbol",
+        "//nisaba/scripts/natural_translit/utils:test_op",
+        "@io_abseil_py//absl/testing:absltest",
+    ],
+)
+
 py_library(
     name = "romanizer",
     srcs = ["romanizer.py"],

nisaba/scripts/natural_translit/phonology/inventories/BUILD.bazel

@@ -0,0 +1,38 @@
+# Copyright 2024 Nisaba Authors.
+#
+# 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.
+
+"""Phonological object inventories."""
+
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+py_library(
+    name = "x_mul",
+    srcs = ["x_mul.py"],
+    deps = [
+        "//nisaba/scripts/natural_translit/phonology:phonological_symbol",
+    ],
+)
+
+py_test(
+    name = "x_mul_test",
+    srcs = ["x_mul_test.py"],
+    main = "x_mul_test.py",
+    deps = [
+        ":x_mul",
+        "//nisaba/scripts/natural_translit/utils:test_op",
+        "@io_abseil_py//absl/testing:absltest",
+    ],
+)