blob: 1fd63f7632298e4c1330facf0ad099661073b955 [file] [log] [blame]
# Copyright 2021 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.
"""A Starlark implementation of the proto_lang_toolchain rule."""
load(":common/proto/proto_common.bzl", "ProtoLangToolchainInfo")
load(":common/proto/proto_semantics.bzl", "semantics")
ProtoInfo = _builtins.toplevel.ProtoInfo
def _rule_impl(ctx):
provided_proto_sources = depset(transitive = [bp[ProtoInfo].transitive_proto_sources() for bp in ctx.attr.blacklisted_protos]).to_list()
flag = ctx.attr.command_line
if flag.find("$(PLUGIN_OUT)") > -1:
fail("in attribute 'command_line': Placeholder '$(PLUGIN_OUT)' is not supported.")
flag = flag.replace("$(OUT)", "%s")
plugin = None
if ctx.attr.plugin != None:
plugin = ctx.attr.plugin[DefaultInfo].files_to_run
proto_compiler = getattr(ctx.attr, "proto_compiler", None)
proto_compiler = getattr(ctx.attr, "_proto_compiler", proto_compiler)
return [
DefaultInfo(
files = depset(),
runfiles = ctx.runfiles(),
),
ProtoLangToolchainInfo(
out_replacement_format_flag = flag,
plugin_format_flag = ctx.attr.plugin_format_flag,
plugin = plugin,
runtime = ctx.attr.runtime,
provided_proto_sources = provided_proto_sources,
proto_compiler = proto_compiler.files_to_run,
protoc_opts = ctx.fragments.proto.experimental_protoc_opts,
progress_message = ctx.attr.progress_message,
mnemonic = ctx.attr.mnemonic,
),
]
def make_proto_lang_toolchain(custom_proto_compiler):
return rule(
_rule_impl,
attrs = dict(
{
"progress_message": attr.string(default = "Generating proto_library %{label}"),
"mnemonic": attr.string(default = "GenProto"),
"command_line": attr.string(mandatory = True),
"plugin_format_flag": attr.string(),
"plugin": attr.label(
executable = True,
cfg = "exec",
),
"runtime": attr.label(),
"blacklisted_protos": attr.label_list(
providers = [ProtoInfo],
),
},
**({
"proto_compiler": attr.label(
cfg = "exec",
executable = True,
),
} if custom_proto_compiler else {
"_proto_compiler": attr.label(
cfg = "exec",
executable = True,
allow_files = True,
default = configuration_field("proto", "proto_compiler"),
),
})
),
provides = [ProtoLangToolchainInfo],
fragments = ["proto"] + semantics.EXTRA_FRAGMENTS,
)