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// flags.cc
//
// 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 definitions
#include <cstring>
#include <fst/compat.h>
#include <fst/flags.h>
DEFINE_int32(v, 0, "verbose level");
DEFINE_bool(help, false, "show usage information");
DEFINE_bool(helpshort, false, "show brief usage information");
DEFINE_string(tmpdir, "/tmp/", "temporary directory");
using namespace std;
static string flag_usage;
static string prog_src;
void SetFlags(const char *usage, int *argc, char ***argv,
bool remove_flags, const char *src) {
flag_usage = usage;
prog_src = src;
int index = 1;
for (; index < *argc; ++index) {
string argval = (*argv)[index];
if (argval[0] != '-' || argval == "-")
break;
while (argval[0] == '-')
argval = argval.substr(1); // remove initial '-'s
string arg = argval;
string val = "";
// split argval (arg=val) into arg and val
int pos = argval.find("=");
if (pos != string::npos) {
arg = argval.substr(0, pos);
val = argval.substr(pos + 1);
}
FlagRegister<bool> *bool_register =
FlagRegister<bool>::GetRegister();
if (bool_register->SetFlag(arg, val))
continue;
FlagRegister<string> *string_register =
FlagRegister<string>::GetRegister();
if (string_register->SetFlag(arg, val))
continue;
FlagRegister<int32> *int32_register =
FlagRegister<int32>::GetRegister();
if (int32_register->SetFlag(arg, val))
continue;
FlagRegister<int64> *int64_register =
FlagRegister<int64>::GetRegister();
if (int64_register->SetFlag(arg, val))
continue;
FlagRegister<double> *double_register =
FlagRegister<double>::GetRegister();
if (double_register->SetFlag(arg, val))
continue;
LOG(FATAL) << "SetFlags: Bad option: " << (*argv)[index];
}
if (remove_flags) {
for (int i = 0; i < *argc - index; ++i)
(*argv)[i + 1] = (*argv)[i + index];
*argc -= index - 1;
}
if (FLAGS_help) {
ShowUsage(true);
exit(1);
}
if (FLAGS_helpshort) {
ShowUsage(false);
exit(1);
}
}
// If flag is defined in file 'src' and 'in_src' true or is not
// defined in file 'src' and 'in_src' is false, then print usage.
static void
ShowUsageRestrict(const std::set< pair<string, string> > &usage_set,
const string &src, bool in_src, bool show_file) {
string old_file;
bool file_out = false;
bool usage_out = false;
for (std::set< pair<string, string> >::const_iterator it =
usage_set.begin();
it != usage_set.end();
++it) {
const string &file = it->first;
const string &usage = it->second;
bool match = file == src;
if ((match && !in_src) || (!match && in_src))
continue;
if (file != old_file) {
if (show_file) {
if (file_out) cout << "\n";
cout << "Flags from: " << file << "\n";
file_out = true;
}
old_file = file;
}
cout << usage << "\n";
usage_out = true;
}
if (usage_out) cout << "\n";
}
void ShowUsage(bool long_usage) {
std::set< pair<string, string> > usage_set;
cout << flag_usage << "\n";
FlagRegister<bool> *bool_register = FlagRegister<bool>::GetRegister();
bool_register->GetUsage(&usage_set);
FlagRegister<string> *string_register = FlagRegister<string>::GetRegister();
string_register->GetUsage(&usage_set);
FlagRegister<int32> *int32_register = FlagRegister<int32>::GetRegister();
int32_register->GetUsage(&usage_set);
FlagRegister<int64> *int64_register = FlagRegister<int64>::GetRegister();
int64_register->GetUsage(&usage_set);
FlagRegister<double> *double_register = FlagRegister<double>::GetRegister();
double_register->GetUsage(&usage_set);
if (!prog_src.empty()) {
cout << "PROGRAM FLAGS:\n\n";
ShowUsageRestrict(usage_set, prog_src, true, false);
}
if (!long_usage)
return;
if (!prog_src.empty())
cout << "LIBRARY FLAGS:\n\n";
ShowUsageRestrict(usage_set, prog_src, false, true);
}
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