62 lines
1.8 KiB
Python
62 lines
1.8 KiB
Python
"""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 = []
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for dep in useful_deps:
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proto_rules = proto_rules + dep.proto_rules
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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 = []
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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 = [target[CcInfo]]
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found = 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_infos = []
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for dep in ctx.attr.deps:
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for dep_proto_rule in dep.proto_rules:
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cc_infos.append(dep_proto_rule)
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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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