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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_OPT_PARSER_H
#define BU_OPT_PARSER_H
#include "bu/string.h"
#include "bu/list.h"
#include "bu/hash.h"
#include "bu/signals.h"
#include "bu/array.h"
#include "bu/membuf.h"
#include "bu/formatter.h"
#include "bu/variant.h"
namespace Bu
{
typedef Bu::Array<Bu::String> StrArray;
/**
* POSIX/Gnu style command line parser. Handles long and short options in
* a variety of fun and useful ways, along with singal based callbacks and
* automatic variable setting. It's pretty easy to use, and very flexible.
*
* OptParser supports it's own builtin help mechanism which automatically
* enumerates the available options and their help in a well formatted and
* easy to read way, automatically formatting your help text per option and
* allows for addition "help banners" which can be placed wherever you
* would like.
*/
class OptParser
{
private:
class _ValueProxy
{
public:
_ValueProxy();
virtual ~_ValueProxy();
virtual void setValueFromStr( const Bu::String & )=0;
virtual void setValue( const Bu::Variant &vVar )=0;
virtual _ValueProxy *clone()=0;
};
template<typename ptype>
class ValueProxy : public _ValueProxy
{
public:
ValueProxy( ptype &v ) :
v( v )
{
}
virtual ~ValueProxy()
{
}
virtual void setValueFromStr( const Bu::String &sVal )
{
Bu::MemBuf mb( sVal );
Bu::Formatter f( mb );
f >> v;
}
virtual void setValue( const Bu::Variant &vVar )
{
if( vVar.getType() == typeid(ptype) )
{
v = vVar.get<ptype>();
}
else if( vVar.getType() == typeid(Bu::String) )
{
setValueFromStr( vVar.get<Bu::String>() );
}
else
{
setValueFromStr( vVar.toString() );
}
}
virtual _ValueProxy *clone()
{
return new ValueProxy<ptype>( v );
}
private:
ptype &v;
};
public:
typedef Signal1<int, StrArray> OptionSignal;
class Option
{
public:
Option();
Option( const Option &rSrc );
virtual ~Option();
char cOpt;
Bu::String sOpt;
Bu::String sHelp;
OptionSignal sUsed;
_ValueProxy *pProxy;
Bu::Variant sOverride;
Bu::String sHelpDefault;
};
private:
typedef Bu::List<Option> OptionList;
typedef Bu::Hash<char, Option *> ShortOptionHash;
typedef Bu::Hash<Bu::String, Option *> LongOptionHash;
class Banner
{
public:
Bu::String sText;
bool bFormatted;
OptionList::const_iterator iAfter;
};
typedef Bu::List<Banner> BannerList;
public:
OptParser();
virtual ~OptParser();
void parse( int argc, char **argv );
void addOption( const Option &opt );
template<typename vtype>
void addOption( vtype &var, char cOpt, const Bu::String &sOpt,
const Bu::String &sHelp )
{
Option o;
o.cOpt = cOpt;
o.sOpt = sOpt;
o.pProxy = new ValueProxy<vtype>( var );
o.sHelp = sHelp;
addOption( o );
}
template<typename vtype>
void addOption( vtype &var, const Bu::String &sOpt,
const Bu::String &sHelp )
{
addOption( var, '\0', sOpt, sHelp );
}
template<typename vtype>
void addOption( vtype &var, char cOpt, const Bu::String &sHelp )
{
addOption( var, cOpt, "", sHelp );
}
void addOption( OptionSignal sUsed, char cOpt, const Bu::String &sOpt,
const Bu::String &sHelp )
{
Option o;
o.cOpt = cOpt;
o.sOpt = sOpt;
o.sUsed = sUsed;
o.sHelp = sHelp;
addOption( o );
}
void addOption( OptionSignal sUsed, const Bu::String &sOpt,
const Bu::String &sHelp )
{
addOption( sUsed, '\0', sOpt, sHelp );
}
void addOption( OptionSignal sUsed, char cOpt,
const Bu::String &sHelp )
{
addOption( sUsed, cOpt, "", sHelp );
}
void setOverride( char cOpt, const Bu::Variant &sOverride );
void setOverride( const Bu::String &sOpt,
const Bu::Variant &sOverride );
void setHelpDefault( const Bu::String &sOpt, const Bu::String &sTxt );
void addHelpOption( char c='h', const Bu::String &s="help",
const Bu::String &sHelp="This help." );
void addHelpBanner( const Bu::String &sText, bool bFormatted=true );
int optHelp( StrArray aParams );
/**
* This function is called when an unrecognized option is found, the
* default behaviour is to print an error to stdout and exit( 1 ), if
* you want to do something different, just override this function.
* This is also called by default when something is found that hasn't
* been handled by an option, and isn't an option (starts with - or --).
* To change this behaviour call
*/
virtual void optionError( const Bu::String &sOption );
void setNonOption( OptionSignal sSignal );
private:
Bu::String format( const Bu::String &sIn, int iWidth, int iIndent );
OptionList lOption;
ShortOptionHash hsOption;
LongOptionHash hlOption;
BannerList lBanner;
OptionSignal sNonOption;
};
};
#endif
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