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// flags.h
//
// 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.
//
// Author: riley@google.com (Michael Riley)
//
// \file
// Google-style flag handling declarations and inline definitions.
#ifndef FST_LIB_FLAGS_H__
#define FST_LIB_FLAGS_H__
#include <iostream>
#include <map>
#include <string>
#include <fst/types.h>
#include <fst/lock.h>
using std::string;
//
// FLAGS USAGE:
//
// Definition example:
//
// DEFINE_int32(length, 0, "length");
//
// This defines variable FLAGS_length, initialized to 0.
//
// Declaration example:
//
// DECLARE_int32(length);
//
// SetFlags() can be used to set flags from the command line
// using, for example, '--length=2'.
//
// ShowUsage() can be used to print out command and flag usage.
//
#define DECLARE_bool(name) extern bool FLAGS_ ## name
#define DECLARE_string(name) extern string FLAGS_ ## name
#define DECLARE_int32(name) extern int32 FLAGS_ ## name
#define DECLARE_int64(name) extern int64 FLAGS_ ## name
#define DECLARE_double(name) extern double FLAGS_ ## name
template <typename T>
struct FlagDescription {
FlagDescription(T *addr, const char *doc, const char *type, const T val)
: address(addr), doc_string(doc), type_name(type), default_value(val) {}
T *address;
const char *doc_string;
const char *type_name;
const T default_value;
};
template <typename T>
class FlagRegister {
public:
static FlagRegister<T> *GetRegister() {
fst::FstOnceInit(®ister_init_, &FlagRegister<T>::Init);
return register_;
}
const FlagDescription<T> &GetFlagDescription(const string &name) const {
fst::MutexLock l(register_lock_);
typename std::map< string, FlagDescription<T> >::const_iterator it =
flag_table_.find(name);
return it != flag_table_.end() ? it->second : 0;
}
void SetDescription(const string &name,
const FlagDescription<T> &desc) {
fst::MutexLock l(register_lock_);
flag_table_.insert(make_pair(name, desc));
}
bool SetFlag(const string &val, bool *address) const {
if (val == "true" || val == "1" || val.empty()) {
*address = true;
return true;
} else if (val == "false" || val == "0") {
*address = false;
return true;
}
else {
return false;
}
}
bool SetFlag(const string &val, string *address) const {
*address = val;
return true;
}
bool SetFlag(const string &val, int32 *address) const {
char *p = 0;
*address = strtol(val.c_str(), &p, 0);
return !val.empty() && *p == '\0';
}
bool SetFlag(const string &val, int64 *address) const {
char *p = 0;
*address = strtoll(val.c_str(), &p, 0);
return !val.empty() && *p == '\0';
}
bool SetFlag(const string &val, double *address) const {
char *p = 0;
*address = strtod(val.c_str(), &p);
return !val.empty() && *p == '\0';
}
bool SetFlag(const string &arg, const string &val) const {
for (typename std::map< string,
FlagDescription<T> >::const_iterator it =
flag_table_.begin();
it != flag_table_.end();
++it) {
const string &name = it->first;
const FlagDescription<T> &desc = it->second;
if (arg == name)
return SetFlag(val, desc.address);
}
return false;
}
void ShowDefault(bool default_value) const {
std::cout << ", default = ";
std::cout << (default_value ? "true" : "false");
}
void ShowDefault(const string &default_value) const {
std::cout << ", default = ";
std::cout << "\"" << default_value << "\"";
}
template<typename V> void ShowDefault(const V& default_value) const {
std::cout << ", default = ";
std::cout << default_value;
}
void ShowUsage() const {
for (typename std::map< string,
FlagDescription<T> >::const_iterator it =
flag_table_.begin();
it != flag_table_.end();
++it) {
const string &name = it->first;
const FlagDescription<T> &desc = it->second;
std::cout << " --" << name
<< ": type = " << desc.type_name;
ShowDefault(desc.default_value);
std::cout << "\n " << desc.doc_string << "\n";
}
}
private:
static void Init() {
register_lock_ = new fst::Mutex;
register_ = new FlagRegister<T>;
}
static fst::FstOnceType register_init_; // ensures only called once
static fst::Mutex* register_lock_; // multithreading lock
static FlagRegister<T> *register_;
std::map< string, FlagDescription<T> > flag_table_;
};
template <class T>
fst::FstOnceType FlagRegister<T>::register_init_ = fst::FST_ONCE_INIT;
template <class T>
fst::Mutex *FlagRegister<T>::register_lock_ = 0;
template <class T>
FlagRegister<T> *FlagRegister<T>::register_ = 0;
template <typename T>
class FlagRegisterer {
public:
FlagRegisterer(const string &name, const FlagDescription<T> &desc) {
FlagRegister<T> *registr = FlagRegister<T>::GetRegister();
registr->SetDescription(name, desc);
}
private:
DISALLOW_COPY_AND_ASSIGN(FlagRegisterer);
};
#define DEFINE_VAR(type, name, value, doc) \
type FLAGS_ ## name = value; \
static FlagRegisterer<type> \
name ## _flags_registerer(#name, FlagDescription<type>(&FLAGS_ ## name, \
doc, \
#type, \
value))
#define DEFINE_bool(name, value, doc) DEFINE_VAR(bool, name, value, doc)
#define DEFINE_string(name, value, doc) \
DEFINE_VAR(string, name, value, doc)
#define DEFINE_int32(name, value, doc) DEFINE_VAR(int32, name, value, doc)
#define DEFINE_int64(name, value, doc) DEFINE_VAR(int64, name, value, doc)
#define DEFINE_double(name, value, doc) DEFINE_VAR(double, name, value, doc)
// Temporary directory
DECLARE_string(tmpdir);
void SetFlags(const char *usage, int *argc, char ***argv, bool remove_flags);
// Deprecated - for backward compatibility
inline void InitFst(const char *usage, int *argc, char ***argv, bool rmflags) {
return SetFlags(usage, argc, argv, rmflags);
}
void ShowUsage();
#endif // FST_LIB_FLAGS_H__
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