59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
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# Copyright 2020 Google LLC
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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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# https://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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"""A trivial rule to turn a string into a C++ constant."""
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def _constant_gen_impl(ctx):
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# Turn text into a C++ constant.
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outputs = [ctx.outputs.src_out]
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ctx.actions.run(
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mnemonic = "GenerateConstant",
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progress_message = "Generating %s" % ctx.attr.var,
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outputs = outputs,
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executable = ctx.executable._generator,
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arguments = [ctx.outputs.src_out.path, ctx.attr.var, ctx.attr.text],
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)
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return [DefaultInfo(files = depset(outputs))]
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_constant_gen = rule(
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implementation = _constant_gen_impl,
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attrs = {
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"src_out": attr.output(mandatory = True),
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"text": attr.string(mandatory = True),
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"var": attr.string(mandatory = False),
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"_generator": attr.label(
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default = Label("@rules_license//examples/vndor/constant_gen:constant_generator"),
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executable = True,
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allow_files = True,
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cfg = "exec",
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),
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},
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)
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def constant_gen(name, text, var):
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# Generate the code
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_constant_gen(
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name = name + "_src_",
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src_out = name + "_src_.cc",
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text = text,
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var = var,
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applicable_licenses = ["@rules_license//examples/vndor/constant_gen:license_for_emitted_code"],
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)
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# And turn it into a library we can link against
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native.cc_library(
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name = name,
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srcs = [name + "_src_"],
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applicable_licenses = ["@rules_license//examples/vndor/constant_gen:license_for_emitted_code"],
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)
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