77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
# Copyright 2019-2020 The MediaPipe Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Extract a cc_library compatible dependency with only the top level proto rules."""
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ProtoLibsInfo = provider(fields = ["targets", "out"])
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def _get_proto_rules(deps, proto_rules = None):
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useful_deps = [dep for dep in deps if hasattr(dep, "proto_rules")]
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if proto_rules == None:
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proto_rules = depset()
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proto_rules = depset(
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transitive = [proto_rules] + [dep.proto_rules for dep in useful_deps],
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)
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return proto_rules
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def _proto_rules_aspect_impl(target, ctx):
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# Make sure the rule has a srcs attribute.
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proto_rules = depset()
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found_cc_proto = False
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if hasattr(ctx.rule.attr, "srcs") and len(ctx.rule.attr.srcs) == 1:
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for f in ctx.rule.attr.srcs[0].files.to_list():
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if f.basename.endswith(".pb.cc"):
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proto_rules = depset([target[CcInfo]])
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found_cc_proto = True
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break
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if not found_cc_proto:
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deps = ctx.rule.attr.deps[:] if hasattr(ctx.rule.attr, "deps") else []
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proto_rules = _get_proto_rules(deps, proto_rules)
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return struct(
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proto_rules = proto_rules,
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)
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proto_rules_aspect = aspect(
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implementation = _proto_rules_aspect_impl,
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attr_aspects = ["deps"],
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)
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def _transitive_protos_impl(ctx):
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"""Implementation of transitive_protos rule.
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Args:
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ctx: The rule context.
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Returns:
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A proto provider (with transitive_sources and transitive_descriptor_sets filled in),
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and marks all transitive sources as default output.
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"""
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cc_info_sets = []
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for dep in ctx.attr.deps:
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cc_info_sets.append(dep.proto_rules)
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cc_infos = depset(transitive = cc_info_sets).to_list()
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return [cc_common.merge_cc_infos(cc_infos = cc_infos)]
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transitive_protos = rule(
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implementation = _transitive_protos_impl,
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attrs =
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{
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"deps": attr.label_list(
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aspects = [proto_rules_aspect],
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),
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},
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provides = [CcInfo],
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)
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