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# Copyright 2025 Google LLC
#
# 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
#
# https://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.
"""
Starlark rule for generating descriptors that is compatible with Protolite Messages.
This is an implementation detail. Clients should use 'java_lite_proto_cel_library' instead.
"""
load("@rules_java//java:defs.bzl", "java_library")
load("//publish:cel_version.bzl", "CEL_VERSION")
load("@com_google_protobuf//bazel:java_lite_proto_library.bzl", "java_lite_proto_library")
load("@com_google_protobuf//bazel/common:proto_info.bzl", "ProtoInfo")
def java_lite_proto_cel_library_impl(
name,
deps,
java_proto_library_dep,
constraints = [],
java_descriptor_class_suffix = None,
debug = False):
"""Generates a CelLiteDescriptor
Args:
name: Name of this target.
deps: The list of proto_library rules to generate Java code for.
java_descriptor_class_suffix (optional): Suffix for the Java class name of the generated CEL lite descriptor.
Default is "CelLiteDescriptor".
constraints: (optional) List of strings that denote which environment the produced java_library label is associated in.
java_proto_library_dep: (optional) Uses the provided java_lite_proto_library or java_proto_library to generate the lite descriptors.
If none is provided, java_lite_proto_library is used by default behind the scenes. Most use cases should not need to provide this.
debug: (optional) If true, prints additional information during codegen for debugging purposes.
"""
if not name:
fail("You must provide a name.")
if not deps or len(deps) < 1:
fail("You must provide at least one proto_library dependency.")
generated = name + "_cel_lite_descriptor"
java_lite_proto_cel_library_rule(
name = generated,
debug = debug,
descriptors = deps,
java_descriptor_class_suffix = java_descriptor_class_suffix,
)
if not java_proto_library_dep:
java_proto_library_dep = name + "_java_lite_proto_dep"
java_lite_proto_library(
name = java_proto_library_dep,
deps = deps,
)
descriptor_codegen_deps = [
"//common/annotations",
"//protobuf:cel_lite_descriptor",
java_proto_library_dep,
]
java_library(
name = name,
srcs = [":" + generated],
deps = descriptor_codegen_deps,
)
def _generate_cel_lite_descriptor_class(ctx):
srcjar_output = ctx.actions.declare_file(ctx.attr.name + ".srcjar")
java_file_path = srcjar_output.path
direct_descriptor_set = depset(
direct = [
descriptor[ProtoInfo].direct_descriptor_set
for descriptor in ctx.attr.descriptors
],
)
transitive_descriptor_set = depset(
transitive = [
descriptor[ProtoInfo].transitive_descriptor_sets
for descriptor in ctx.attr.descriptors
],
)
args = ctx.actions.args()
args.add("--version", CEL_VERSION)
args.add_joined("--descriptor_set", direct_descriptor_set, join_with = ",")
args.add_joined("--transitive_descriptor_set", transitive_descriptor_set, join_with = ",")
args.add("--out", java_file_path)
if ctx.attr.java_descriptor_class_suffix:
args.add("--overridden_descriptor_class_suffix", ctx.attr.java_descriptor_class_suffix)
if ctx.attr.debug:
args.add("--debug")
ctx.actions.run(
mnemonic = "CelLiteDescriptorGenerator",
arguments = [args],
inputs = transitive_descriptor_set,
outputs = [srcjar_output],
progress_message = "Generating CelLiteDescriptor for: " + ctx.attr.name,
executable = ctx.executable._tool,
)
return [DefaultInfo(files = depset([srcjar_output]))]
java_lite_proto_cel_library_rule = rule(
implementation = _generate_cel_lite_descriptor_class,
attrs = {
"java_descriptor_class_suffix": attr.string(),
"descriptors": attr.label_list(
providers = [ProtoInfo],
),
"debug": attr.bool(),
"_tool": attr.label(
executable = True,
cfg = "exec",
allow_files = True,
default = Label("//protobuf:cel_lite_descriptor_generator"),
),
},
)