110 lines
3.4 KiB
Python
110 lines
3.4 KiB
Python
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"""Starlark implementation of zig_proto_library"""
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load("@rules_proto//proto:defs.bzl", "proto_common")
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load(
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"@rules_zig//zig/private/providers:zig_module_info.bzl",
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"ZigModuleInfo",
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"zig_module_info",
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)
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def _zig_proto_library_impl(ctx):
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if len(ctx.attr.deps) != 1:
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fail("zig_proto_library '{}' requires exactly one 'deps'".format(ctx.label.name))
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(dep,) = ctx.attr.deps
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# the aspect already generated for us the Zig module
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# we just change the import name to make it match what the user chose.
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module = dep[ZigModuleInfo]
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import_name = ctx.attr.import_name or ctx.label.name
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if import_name:
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keys = ["canonical_name", "cdeps", "copts", "deps", "extra_srcs", "linkopts", "main", "srcs"]
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args = {k: getattr(module, k) for k in keys}
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args["name"] = import_name
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module = zig_module_info(**args)
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return [module]
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def zig_proto_library_aspect_impl(target, ctx):
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"""
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For each `.proto` in the given target dependencies,
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generate a `.pb.zig` file, and a `zig_module` to import it.
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"""
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toolchain = ctx.attr._zig_proto_toolchain[proto_common.ProtoLangToolchainInfo]
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proto_info = target[ProtoInfo]
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# assert len(proto_info.direct_sources) == 1, "Can only compile .proto files one by one"
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(proto_src,) = proto_info.direct_sources
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pb_zig_name = proto_src.basename[:-len(".proto")] + ".pb.zig"
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zig_src = ctx.actions.declare_file(pb_zig_name, sibling = proto_src)
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ctx.actions.run
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proto_common.compile(
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ctx.actions,
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proto_info = proto_info,
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proto_lang_toolchain_info = toolchain,
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generated_files = [zig_src],
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)
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zig_proto_modules = [p[ZigModuleInfo] for p in ctx.rule.attr.deps]
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import_name = get_import_name(target, proto_src)
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module = zig_module_info(
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name = import_name,
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canonical_name = str(target.label),
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main = zig_src,
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srcs = [],
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extra_srcs = [],
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copts = [],
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linkopts = [],
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deps = [toolchain.runtime[ZigModuleInfo]] + zig_proto_modules,
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cdeps = [],
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)
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return [module]
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def get_import_name(target, proto_src):
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"""
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When the Zig protoc plugin is generating .pb.zig files,
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it generates import names based on the path received from protoc.
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We need to create Zig modules with the same name.
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"""
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name = str(target.label)
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# special handling of builtin types
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if "com_google_protobuf//:" in name:
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name = "google_protobuf_" + proto_src.basename
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else:
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name = name.rsplit("//")[-1]
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name = name.rsplit("//")[-1]
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return name.replace(".", "_").replace(":", "_").replace("/", "_")
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zig_proto_library_aspect = aspect(
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attrs = {
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"_zig_proto_toolchain": attr.label(
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default = "@zig-protobuf//:zig_toolchain",
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providers = [proto_common.ProtoLangToolchainInfo],
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),
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},
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implementation = zig_proto_library_aspect_impl,
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provides = [ZigModuleInfo],
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attr_aspects = ["deps"],
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)
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zig_proto_library = rule(
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doc = """
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Converts a single `proto_library` into a zig module.
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""",
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implementation = _zig_proto_library_impl,
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attrs = {
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"deps": attr.label_list(
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aspects = [zig_proto_library_aspect],
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providers = [ProtoInfo],
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),
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"import_name": attr.string(
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doc = "The import name of the Zig module.",
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default = "",
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),
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},
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provides = [ZigModuleInfo],
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)
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