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/*
* Copyright (C) 2015 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 "Flags.h"
#include "util/StringPiece.h"
#include "util/Util.h"
#include <iomanip>
#include <iostream>
#include <string>
#include <vector>
namespace aapt {
Flags& Flags::requiredFlag(const StringPiece& name, const StringPiece& description,
std::string* value) {
auto func = [value](const StringPiece& arg) -> bool {
*value = arg.toString();
return true;
};
mFlags.push_back(Flag{ name.toString(), description.toString(), func, true, 1, false});
return *this;
}
Flags& Flags::requiredFlagList(const StringPiece& name, const StringPiece& description,
std::vector<std::string>* value) {
auto func = [value](const StringPiece& arg) -> bool {
value->push_back(arg.toString());
return true;
};
mFlags.push_back(Flag{ name.toString(), description.toString(), func, true, 1, false });
return *this;
}
Flags& Flags::optionalFlag(const StringPiece& name, const StringPiece& description,
Maybe<std::string>* value) {
auto func = [value](const StringPiece& arg) -> bool {
*value = arg.toString();
return true;
};
mFlags.push_back(Flag{ name.toString(), description.toString(), func, false, 1, false });
return *this;
}
Flags& Flags::optionalFlagList(const StringPiece& name, const StringPiece& description,
std::vector<std::string>* value) {
auto func = [value](const StringPiece& arg) -> bool {
value->push_back(arg.toString());
return true;
};
mFlags.push_back(Flag{ name.toString(), description.toString(), func, false, 1, false });
return *this;
}
Flags& Flags::optionalSwitch(const StringPiece& name, const StringPiece& description,
bool* value) {
auto func = [value](const StringPiece& arg) -> bool {
*value = true;
return true;
};
mFlags.push_back(Flag{ name.toString(), description.toString(), func, false, 0, false });
return *this;
}
void Flags::usage(const StringPiece& command, std::ostream* out) {
constexpr size_t kWidth = 50;
*out << command << " [options]";
for (const Flag& flag : mFlags) {
if (flag.required) {
*out << " " << flag.name << " arg";
}
}
*out << " files...\n\nOptions:\n";
for (const Flag& flag : mFlags) {
std::string argLine = flag.name;
if (flag.numArgs > 0) {
argLine += " arg";
}
// Split the description by newlines and write out the argument (which is empty after
// the first line) followed by the description line. This will make sure that multiline
// descriptions are still right justified and aligned.
for (StringPiece line : util::tokenize<char>(flag.description, '\n')) {
*out << " " << std::setw(kWidth) << std::left << argLine << line << "\n";
argLine = " ";
}
}
*out << " " << std::setw(kWidth) << std::left << "-h" << "Displays this help menu\n";
out->flush();
}
bool Flags::parse(const StringPiece& command, const std::vector<StringPiece>& args,
std::ostream* outError) {
for (size_t i = 0; i < args.size(); i++) {
StringPiece arg = args[i];
if (*(arg.data()) != '-') {
mArgs.push_back(arg.toString());
continue;
}
if (arg == "-h" || arg == "--help") {
usage(command, outError);
return false;
}
bool match = false;
for (Flag& flag : mFlags) {
if (arg == flag.name) {
if (flag.numArgs > 0) {
i++;
if (i >= args.size()) {
*outError << flag.name << " missing argument.\n\n";
usage(command, outError);
return false;
}
flag.action(args[i]);
} else {
flag.action({});
}
flag.parsed = true;
match = true;
break;
}
}
if (!match) {
*outError << "unknown option '" << arg << "'.\n\n";
usage(command, outError);
return false;
}
}
for (const Flag& flag : mFlags) {
if (flag.required && !flag.parsed) {
*outError << "missing required flag " << flag.name << "\n\n";
usage(command, outError);
return false;
}
}
return true;
}
const std::vector<std::string>& Flags::getArgs() {
return mArgs;
}
} // namespace aapt
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