Add builtins exports keys for py_binary, py_test, and py_library

This allows starting the builtin-Starlark based implementation of the rules
for Bazel (which is really mostly copy/refactoring the Google code).

Work towards bazelbuild#15897

PiperOrigin-RevId: 490246272
Change-Id: I528f347d9f9ead8311fc5d365a6a343eba0af735

src/main/starlark/builtins_bzl/common/exports.bzl

@@ -25,8 +25,11 @@ load("@_builtins//:common/objc/linking_support.bzl", "linking_support")
 load("@_builtins//:common/proto/proto_common.bzl", "proto_common_do_not_use")
 load("@_builtins//:common/proto/proto_library.bzl", "proto_library")
 load("@_builtins//:common/proto/proto_lang_toolchain_wrapper.bzl", "proto_lang_toolchain")
-load("@_builtins//:common/python/py_runtime_macro.bzl", "py_runtime")
+load("@_builtins//:common/python/py_binary_macro.bzl", "py_binary")
 load("@_builtins//:common/python/py_internal.bzl", "py_internal")
+load("@_builtins//:common/python/py_library_macro.bzl", "py_library")
+load("@_builtins//:common/python/py_runtime_macro.bzl", "py_runtime")
+load("@_builtins//:common/python/py_test_macro.bzl", "py_test")
 load("@_builtins//:common/python/providers.bzl", "PyInfo", "PyRuntimeInfo")
 load("@_builtins//:common/java/proto/java_lite_proto_library.bzl", "java_lite_proto_library")
 load("@_builtins//:common/cc/cc_library.bzl", "cc_library")
@@ -62,6 +65,9 @@ exported_rules = {
     "+cc_library": cc_library,
     "proto_lang_toolchain": proto_lang_toolchain,
     "+py_runtime": py_runtime,
+    "-py_binary": py_binary,
+    "-py_test": py_test,
+    "-py_library": py_library,
 }
 
 # A list of Starlark functions callable from native rules implementation.

src/main/starlark/builtins_bzl/common/python/py_binary_macro.bzl

@@ -0,0 +1,18 @@
+# Copyright 2022 The Bazel Authors. 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.
+"""Implementation of macro-half of py_binary rule."""
+
+def py_binary(**kwargs):
+    _ = kwargs  # @unused
+    pass

src/main/starlark/builtins_bzl/common/python/py_library_macro.bzl

@@ -0,0 +1,18 @@
+# Copyright 2022 The Bazel Authors. 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.
+"""Implementation of macro-half of py_library rule."""
+
+def py_library(**kwargs):
+    _ = kwargs  # @unused
+    pass

src/main/starlark/builtins_bzl/common/python/py_test_macro.bzl

@@ -0,0 +1,18 @@
+# Copyright 2022 The Bazel Authors. 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.
+"""Implementation of macro-half of py_test rule."""
+
+def py_test(**kwargs):
+    _ = kwargs  # @unused
+    pass