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