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/*
PowerDNS Versatile Database Driven Nameserver
Copyright (C) 2002 PowerDNS.COM BV
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef ARGUMENTS_HH
#define ARGUMENTS_HH
#include <map>
#include <string>
#include <vector>
#include <fstream>
#include <iostream>
#include "misc.hh"
#include "ahuexception.hh"
#ifndef WIN32
# include <sys/types.h>
# include <pwd.h>
# include <grp.h>
#endif
using namespace std;
typedef AhuException ArgException;
/** This class helps parsing argc and argv into a map of parameters. We have 3 kinds of formats:
-w this leads to a key/value pair of "w"/void
--port=25 "port"/"25"
--daemon "daemon"/void
We do not support "--port 25" syntax.
It can also read from a file. This file can contain '#' to delimit comments.
Some sample code:
\code
ArgvMap R;
R.set("port")="25"; // use this to specify default parameters
R.file("./default.conf"); // parse configuration file
R.parse(argc, argv); // read the arguments from main()
cout<<"Will we be a deamon?: "<<R.isset("daemon")<<endl;
cout<<"Our port will be "<<R["port"]<<endl;
map<string,string>::const_iterator i;
cout<<"via iterator"<<endl;
for(i=R.begin();i!=R.end();i++)
cout<<i->first<<"="<<i->second<<endl;
\endcode
*/
class ArgvMap
{
public:
ArgvMap();
void parse(int &argc, char **argv, bool lax=false); //!< use this to parse from argc and argv
void laxParse(int &argc, char **argv) //!< use this to parse from argc and argv
{
parse(argc,argv,true);
}
void preParse(int &argc, char **argv, const string &arg); //!< use this to preparse a single var
bool preParseFile(const char *fname, const string &arg, const string& theDefault=""); //!< use this to preparse a single var in configuration
bool file(const char *fname, bool lax=false); //!< Parses a file with parameters
bool laxFile(const char *fname)
{
return file(fname,true);
}
typedef map<string,string> param_t; //!< use this if you need to know the content of the map
bool parmIsset(const string &var); //!< Checks if a parameter is set to *a* value
bool mustDo(const string &var); //!< if a switch is given, if we must do something (--help)
int asNum(const string &var); //!< return a variable value as a number
#ifndef WIN32
mode_t asMode(const string &var); //<!< return value interprepted as octal number
uid_t asUid(const string &var); //!< return user id, resolves if necessary
gid_t asGid(const string &var); //!< return group id, resolves if necessary
#endif
double asDouble(const string &var); //!< return a variable value as a number
string &set(const string &); //!< Gives a writable reference and allocates space for it
string &set(const string &, const string &); //!< Does the same but also allows to specify a help message
void setCmd(const string &, const string &); //!< Add a command flag
string &setSwitch(const string &, const string &); //!< Add a command flag
string helpstring(string prefix=""); //!< generates the --help
string configstring(); //!< generates the --mkconfig
bool contains(const string &var, const string &val);
bool isEmpty(const string &var); //<! checks if variable has value
vector<string>list();
string getHelp(const string &item);
const param_t::const_iterator begin(); //!< iterator semantics
const param_t::const_iterator end(); //!< iterator semantics
const string &operator[](const string &); //!< iterator semantics
const vector<string>&getCommands();
private:
void parseOne(const string &unparsed, const string &parseOnly="", bool lax=false);
typedef map<string,string> params_t;
params_t params;
map<string,string> helpmap;
map<string,string> d_typeMap;
vector<string> d_cmds;
};
extern ArgvMap &arg();
#endif /* ARGUMENTS_HH */
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