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// Copyright 2016 Google Inc.
//
// 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 <algorithm>
#include <cctype>
#include <iostream>
#include <map>
#include <sstream>
#include <string>
#include <utility>
#include "common.h"
#include "config.h"
#include "util.h"
namespace sentencepiece {
namespace flags {
struct Flag {
int type;
void *storage;
const void *default_storage;
std::string help;
};
namespace {
using FlagMap = std::map<std::string, Flag *>;
FlagMap *GetFlagMap() {
static FlagMap flag_map;
return &flag_map;
}
bool SetFlag(const std::string &name, const std::string &value) {
auto it = GetFlagMap()->find(name);
if (it == GetFlagMap()->end()) {
return false;
}
std::string v = value;
Flag *flag = it->second;
// If empty value is set, we assume true or emtpy string is set
// for boolean or string option. With other types, setting fails.
if (value.empty()) {
switch (flag->type) {
case B:
v = "true";
break;
case S:
v = "";
break;
default:
return false;
}
}
#define DEFINE_ARG(FLAG_TYPE, CPP_TYPE) \
case FLAG_TYPE: { \
CPP_TYPE *s = reinterpret_cast<CPP_TYPE *>(flag->storage); \
CHECK(string_util::lexical_cast<CPP_TYPE>(v, s)); \
break; \
}
switch (flag->type) {
DEFINE_ARG(I, int32);
DEFINE_ARG(B, bool);
DEFINE_ARG(I64, int64);
DEFINE_ARG(U64, uint64);
DEFINE_ARG(D, double);
DEFINE_ARG(S, std::string);
default:
break;
}
return true;
} // namespace
bool CommandLineGetFlag(int argc, char **argv, std::string *key,
std::string *value, int *used_args) {
key->clear();
value->clear();
*used_args = 1;
const char *start = argv[0];
if (start[0] != '-') {
return false;
}
++start;
if (start[0] == '-') ++start;
const std::string arg = start;
const size_t n = arg.find("=");
if (n != std::string::npos) {
*key = arg.substr(0, n);
*value = arg.substr(n + 1, arg.size() - n);
return true;
}
key->assign(arg);
value->clear();
if (argc == 1) {
return true;
}
start = argv[1];
if (start[0] == '-') {
return true;
}
*used_args = 2;
value->assign(start);
return true;
}
} // namespace
FlagRegister::FlagRegister(const char *name, void *storage,
const void *default_storage, int shortype,
const char *help)
: flag_(new Flag) {
flag_->type = shortype;
flag_->storage = storage;
flag_->default_storage = default_storage;
flag_->help = help;
GetFlagMap()->insert(std::make_pair(std::string(name), flag_.get()));
}
FlagRegister::~FlagRegister() {}
std::string PrintHelp(const char *programname) {
std::ostringstream os;
os << PACKAGE_STRING << "\n\n";
os << "Usage: " << programname << " [options] files\n\n";
for (const auto &it : *GetFlagMap()) {
os << " --" << it.first << " (" << it.second->help << ")";
const Flag *flag = it.second;
switch (flag->type) {
case I:
os << " type: int32 default: "
<< *(reinterpret_cast<const int *>(flag->default_storage)) << '\n';
break;
case B:
os << " type: bool default: "
<< (*(reinterpret_cast<const bool *>(flag->default_storage))
? "true"
: "false")
<< '\n';
break;
case I64:
os << " type: int64 default: "
<< *(reinterpret_cast<const int64 *>(flag->default_storage)) << '\n';
break;
case U64:
os << " type: uint64 default: "
<< *(reinterpret_cast<const uint64 *>(flag->default_storage))
<< '\n';
break;
case D:
os << " type: double default: "
<< *(reinterpret_cast<const double *>(flag->default_storage))
<< '\n';
break;
case S:
os << " type: string default: "
<< *(reinterpret_cast<const std::string *>(flag->default_storage))
<< '\n';
break;
default:
break;
}
}
os << "\n\n";
return os.str();
}
void ParseCommandLineFlags(int argc, char **argv,
std::vector<std::string> *rest_flags) {
int used_argc = 0;
std::string key, value;
for (int i = 1; i < argc; i += used_argc) {
if (!CommandLineGetFlag(argc - i, argv + i, &key, &value, &used_argc)) {
if (rest_flags) rest_flags->push_back(std::string(argv[i]));
continue;
}
if (key == "help") {
std::cout << PrintHelp(argv[0]);
error::Exit(0);
} else if (key == "version") {
std::cout << PACKAGE_STRING << " " << VERSION << std::endl;
error::Exit(0);
} else if (!SetFlag(key, value)) {
std::cerr << "Unknown/Invalid flag " << key << "\n\n"
<< PrintHelp(argv[0]);
error::Exit(1);
}
}
}
} // namespace flags
} // namespace sentencepiece
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