google-cloud-cpp/generator/internal/codegen_utils.cc at main · unforced/google-cloud-cpp · GitHub

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// 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.

#include "generator/internal/codegen_utils.h"

#include "google/cloud/internal/absl_str_cat_quiet.h"

#include "google/cloud/internal/absl_str_join_quiet.h"

#include "google/cloud/internal/absl_str_replace_quiet.h"

#include "absl/container/flat_hash_set.h"

#include "absl/strings/str_split.h"

#include "absl/time/clock.h"

#include "absl/time/time.h"

#include <google/protobuf/compiler/code_generator.h>

#include <cctype>

#include <string>

namespace google {

namespace cloud {

namespace generator_internal {

namespace {

std::vector<std::pair<std::string, std::string>> const& SnakeCaseExceptions() {

static const std::vector<std::pair<std::string, std::string>> kExceptions = {

{"big_query", "bigquery"}};

return kExceptions;

}

Status ProcessArgProductPath(

std::vector<std::pair<std::string, std::string>>& command_line_args) {

auto product_path =

std::find_if(command_line_args.begin(), command_line_args.end(),

[](std::pair<std::string, std::string> const& p) {

return p.first == "product_path";

});

if (product_path == command_line_args.end() || product_path->second.empty()) {

return Status(StatusCode::kInvalidArgument,

"--cpp_codegen_opt=product_path=<path> must be specified.");

}

auto& path = product_path->second;

if (path.front() == '/') {

path = path.substr(1);

}

if (path.back() != '/') {

path += '/';

}

return {};

}

Status ProcessArgGoogleapisCommitHash(

std::vector<std::pair<std::string, std::string>>& command_line_args) {

auto googleapis_commit_hash =

std::find_if(command_line_args.begin(), command_line_args.end(),

[](std::pair<std::string, std::string> const& p) {

return p.first == "googleapis_commit_hash";

});

if (googleapis_commit_hash == command_line_args.end() ||

googleapis_commit_hash->second.empty()) {

return Status(

StatusCode::kInvalidArgument,

"--cpp_codegen_opt=googleapis_commit_hash=<hash> must be specified.");

}

return {};

}

void ProcessArgCopyrightYear(

std::vector<std::pair<std::string, std::string>>& command_line_args) {

auto copyright_year =

std::find_if(command_line_args.begin(), command_line_args.end(),

[](std::pair<std::string, std::string> const& p) {

return p.first == "copyright_year";

});

if (copyright_year == command_line_args.end()) {

command_line_args.emplace_back("copyright_year", CurrentCopyrightYear());

} else if (copyright_year->second.empty()) {

copyright_year->second = CurrentCopyrightYear();

}

void ProcessArgOmitRpc(

std::vector<std::pair<std::string, std::string>>& command_line_args) {

absl::flat_hash_set<std::string> omitted_rpcs;

auto iter = std::find_if(command_line_args.begin(), command_line_args.end(),

[](std::pair<std::string, std::string> const& p) {

return p.first == "omit_rpc";

});

while (iter != command_line_args.end()) {

omitted_rpcs.insert(iter->second);

command_line_args.erase(iter);

iter = std::find_if(command_line_args.begin(), command_line_args.end(),

[](std::pair<std::string, std::string> const& p) {

return p.first == "omit_rpc";

});

}

if (!omitted_rpcs.empty()) {

command_line_args.emplace_back(

"omitted_rpcs",

absl::StrJoin(omitted_rpcs.begin(), omitted_rpcs.end(), ","));

}

} // namespace

std::string CurrentCopyrightYear() {

static std::string const kCurrentCopyrightYear =

absl::FormatTime("%Y", absl::Now(), absl::UTCTimeZone());

return kCurrentCopyrightYear;

}

std::string LocalInclude(absl::string_view header) {

if (header.empty()) return {};

return absl::StrCat("#include \"", header, "\"\n");

}

std::string SystemInclude(absl::string_view header) {

if (header.empty()) return {};

return absl::StrCat("#include <", header, ">\n");

}

std::string CamelCaseToSnakeCase(absl::string_view input) {

std::string output;

for (auto i = 0U; i < input.size(); ++i) {

auto const uc = static_cast<unsigned char>(input[i]);

auto const lower = static_cast<char>(std::tolower(uc));

if (input[i] != '_' && i + 2 < input.size()) {

if (std::isupper(static_cast<unsigned char>(input[i + 1])) &&

std::islower(static_cast<unsigned char>(input[i + 2]))) {

output += lower;

output += '_';

continue;

}

if (input[i] != '_' && i + 1 < input.size()) {

if ((std::islower(static_cast<unsigned char>(input[i])) ||

std::isdigit(static_cast<unsigned char>(input[i]))) &&

std::isupper(static_cast<unsigned char>(input[i + 1]))) {

output += lower;

output += '_';

continue;

}

output += lower;

}

output = absl::StrReplaceAll(output, SnakeCaseExceptions());

return output;

}

std::string ServiceNameToFilePath(absl::string_view service_name) {

std::vector<absl::string_view> components = absl::StrSplit(service_name, ".");

absl::ConsumeSuffix(&components.back(), "Service");

auto formatter = [](std::string* s, absl::string_view sv) {

*s += CamelCaseToSnakeCase(sv);

};

return absl::StrJoin(components, "/", formatter);

}

std::string ProtoNameToCppName(absl::string_view proto_name) {

return absl::StrReplaceAll(proto_name, {{".", "::"}});

}

std::vector<std::string> BuildNamespaces(std::string const& product_path,

NamespaceType ns_type) {

std::vector<std::string> v =

absl::StrSplit(product_path, '/', absl::SkipEmpty());

std::string name =

absl::StrJoin(v.begin() + (v.size() > 2 ? 2 : 0), v.end(), "_");

if (ns_type == NamespaceType::kInternal) {

absl::StrAppend(&name, "_internal");

}

if (ns_type == NamespaceType::kMocks) {

absl::StrAppend(&name, "_mocks");

}

return std::vector<std::string>{"google", "cloud", name,

"GOOGLE_CLOUD_CPP_GENERATED_NS"};

}

StatusOr<std::vector<std::pair<std::string, std::string>>>

ProcessCommandLineArgs(std::string const& parameters) {

std::vector<std::pair<std::string, std::string>> command_line_args;

google::protobuf::compiler::ParseGeneratorParameter(parameters,

&command_line_args);

auto status = ProcessArgProductPath(command_line_args);

if (!status.ok()) return status;

status = ProcessArgGoogleapisCommitHash(command_line_args);

if (!status.ok()) return status;

ProcessArgCopyrightYear(command_line_args);

ProcessArgOmitRpc(command_line_args);

return command_line_args;

}

std::string CopyrightLicenseFileHeader() {

static auto constexpr kHeader = // clang-format off

"// Copyright $copyright_year$ Google LLC\n"

"//\n"

"// Licensed under the Apache License, Version 2.0 (the \"License\");\n"

"// you may not use this file except in compliance with the License.\n"

"// You may obtain a copy of the License at\n"

"//\n"

"// https://www.apache.org/licenses/LICENSE-2.0\n"

"//\n"

"// Unless required by applicable law or agreed to in writing, software\n"

"// distributed under the License is distributed on an \"AS IS\" BASIS,\n"

"// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n"

"// See the License for the specific language governing permissions and\n"

"// limitations under the License.\n\n";

// clang-format on

return kHeader;

}

} // namespace generator_internal

} // namespace cloud

} // namespace google

google-cloud-cpp/generator/internal/codegen_utils.cc at main · unforced/google-cloud-cpp · GitHub

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