EnumOption.h

/*
 *  $Id$
 *  EnumOption class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2006-07, IRIT UPS.
 * 
 *  OTAWA is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  OTAWA 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 OTAWA; if not, write to the Free Software 
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_OPTION_ENUM_OPTION_H
#define ELM_OPTION_ENUM_OPTION_H
 
#include <elm/option/Option.h>
 
namespace elm { namespace option {
 
// BoolOption class
template <class T>
class EnumOption: public Option {
public:
    typedef Pair<cstring, T> value_t;
 
    class Make: public Option::Make {
        friend class EnumOption;
    public:
        Make(Manager *m): Option::Make(m), _def(), _def_set(false) { }
        Make(Manager& m): Option::Make(m), _def(), _def_set(false) { }
        inline Make& cmd(string cmd) { Option::Make::cmd(cmd); return *this; }
        inline Make& description(cstring desc) { Option::Make::description(desc); return *this; }
        inline Make& val(cstring n, T v) { _values.add(pair(n, v)); return *this; }
        inline Make& def(T v) { _def = v; _def_set = true; return *this; }
        inline Make& arg(cstring d) { _arg = d; return *this; }
    private:
        Vector<value_t> _values;
        T _def;
        bool _def_set;
        cstring _arg;
    };
 
    inline EnumOption(const Make& m): Option(m),
        val(m._def_set ? m._def : m._values[0].snd), vals(m._values), arg(m._arg) { }
 
    inline T value(void) const { return val; }
    inline void set(const T& value) { val = value; }
 
    // Option overload
    usage_t usage(void) override { return arg_required; }
    
    void process(String arg) override {
        for(auto v: vals) if(arg == v.fst) { val = v.snd; return; }
        throw OptionException(_ << "bad value \"" << arg << "\"");
    }
 
    cstring argDescription(void) override { return arg; }
 
    // Operators
    inline operator T(void) const { return value(); }
    inline EnumOption& operator=(const T& value) { set(value); return *this; }
 
private:
    T val;
    Vector<value_t> vals;
    cstring arg;
};
 
} } // elm::option
 
#endif // ELM_OPTION_ENUM_OPTION_H