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#!/usr/bin/env python3
# Copyright 2021 gRPC authors.
#
# 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
#
# http://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.
import sys
# utility: print a big comment block into a set of files
def put_banner(files, banner):
for f in files:
print('/*', file=f)
for line in banner:
print(' * %s' % line, file=f)
print(' */', file=f)
print('', file=f)
with open('src/core/lib/promise/detail/switch.h', 'w') as H:
# copy-paste copyright notice from this file
with open(sys.argv[0]) as my_source:
copyright = []
for line in my_source:
if line[0] != '#':
break
for line in my_source:
if line[0] == '#':
copyright.append(line)
break
for line in my_source:
if line[0] != '#':
break
copyright.append(line)
put_banner([H], [line[2:].rstrip() for line in copyright])
put_banner([H], ["Automatically generated by %s" % sys.argv[0]])
print("#ifndef GRPC_CORE_LIB_PROMISE_DETAIL_SWITCH_H", file=H)
print("#define GRPC_CORE_LIB_PROMISE_DETAIL_SWITCH_H", file=H)
print('', file=H)
print('#include <grpc/impl/codegen/port_platform.h>', file=H)
print('', file=H)
print("#include <stdlib.h>", file=H)
print('', file=H)
print("namespace grpc_core {", file=H)
for n in range(1, 33):
print('', file=H)
print("template <typename R, %s> R Switch(char idx, %s) {" % (
", ".join("typename F%d" % i for i in range(0, n)),
", ".join("F%d f%d" % (i, i) for i in range(0, n)),
),
file=H)
print(" switch (idx) {", file=H)
for i in range(0, n):
print(" case %d: return f%d();" % (i, i), file=H)
print(" }", file=H)
print(" abort();", file=H)
print("}", file=H)
print('', file=H)
print("}", file=H)
print('', file=H)
print("#endif // GRPC_CORE_LIB_PROMISE_DETAIL_SWITCH_H", file=H)
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