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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.
*/
#include <algorithm>
#include <iomanip>
#include <iostream>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include "android-base/macros.h"
#include "idmap2/CommandLineOptions.h"
namespace android::idmap2 {
std::unique_ptr<std::vector<std::string>> CommandLineOptions::ConvertArgvToVector(
int argc, const char** argv) {
return std::make_unique<std::vector<std::string>>(argv + 1, argv + argc);
}
CommandLineOptions& CommandLineOptions::OptionalFlag(const std::string& name,
const std::string& description, bool* value) {
assert(value != nullptr);
auto func = [value](const std::string& arg ATTRIBUTE_UNUSED) -> void { *value = true; };
options_.push_back(Option{name, description, func, Option::COUNT_OPTIONAL, false});
return *this;
}
CommandLineOptions& CommandLineOptions::MandatoryOption(const std::string& name,
const std::string& description,
std::string* value) {
assert(value != nullptr);
auto func = [value](const std::string& arg) -> void { *value = arg; };
options_.push_back(Option{name, description, func, Option::COUNT_EXACTLY_ONCE, true});
return *this;
}
CommandLineOptions& CommandLineOptions::MandatoryOption(const std::string& name,
const std::string& description,
std::vector<std::string>* value) {
assert(value != nullptr);
auto func = [value](const std::string& arg) -> void { value->push_back(arg); };
options_.push_back(Option{name, description, func, Option::COUNT_ONCE_OR_MORE, true});
return *this;
}
CommandLineOptions& CommandLineOptions::OptionalOption(const std::string& name,
const std::string& description,
std::string* value) {
assert(value != nullptr);
auto func = [value](const std::string& arg) -> void { *value = arg; };
options_.push_back(Option{name, description, func, Option::COUNT_OPTIONAL, true});
return *this;
}
bool CommandLineOptions::Parse(const std::vector<std::string>& argv, std::ostream& outError) const {
const auto pivot = std::partition(options_.begin(), options_.end(), [](const Option& opt) {
return opt.count != Option::COUNT_OPTIONAL;
});
std::set<std::string> mandatory_opts;
std::transform(options_.begin(), pivot, std::inserter(mandatory_opts, mandatory_opts.end()),
[](const Option& opt) -> std::string { return opt.name; });
const size_t argv_size = argv.size();
for (size_t i = 0; i < argv_size; i++) {
const std::string arg = argv[i];
if ("--help" == arg || "-h" == arg) {
Usage(outError);
return false;
}
bool match = false;
for (const Option& opt : options_) {
if (opt.name == arg) {
match = true;
if (opt.argument) {
i++;
if (i >= argv_size) {
outError << "error: " << opt.name << ": missing argument" << std::endl;
Usage(outError);
return false;
}
}
opt.action(argv[i]);
mandatory_opts.erase(opt.name);
break;
}
}
if (!match) {
outError << "error: " << arg << ": unknown option" << std::endl;
Usage(outError);
return false;
}
}
if (!mandatory_opts.empty()) {
for (const auto& opt : mandatory_opts) {
outError << "error: " << opt << ": missing mandatory option" << std::endl;
}
Usage(outError);
return false;
}
return true;
}
void CommandLineOptions::Usage(std::ostream& out) const {
size_t maxLength = 0;
out << "usage: " << name_;
for (const Option& opt : options_) {
const bool mandatory = opt.count != Option::COUNT_OPTIONAL;
out << " ";
if (!mandatory) {
out << "[";
}
if (opt.argument) {
out << opt.name << " arg";
maxLength = std::max(maxLength, opt.name.size() + 4);
} else {
out << opt.name;
maxLength = std::max(maxLength, opt.name.size());
}
if (!mandatory) {
out << "]";
}
if (opt.count == Option::COUNT_ONCE_OR_MORE) {
out << " [" << opt.name << " arg [..]]";
}
}
out << std::endl << std::endl;
for (const Option& opt : options_) {
out << std::left << std::setw(maxLength);
if (opt.argument) {
out << (opt.name + " arg");
} else {
out << opt.name;
}
out << " " << opt.description;
if (opt.count == Option::COUNT_ONCE_OR_MORE) {
out << " (can be provided multiple times)";
}
out << std::endl;
}
}
} // namespace android::idmap2
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