enum_info.h

/*
 *  enum_info class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2013, 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_ENUM_INFO_H_
#define ELM_ENUM_INFO_H_

#include <elm/io/IOException.h>
#include <elm/type_info.h>

namespace elm {

template <class T>
struct enum_info: public enum_t {
    typedef struct value_t {
        inline value_t(cstring n, const T& v) { name = n; value = v; }
        cstring name;
        T value;
    } value_t;
    enum { is_defined_enum = 1 };
    static value_t values[];
    static cstring name(void);

    // value building
    static inline value_t value(const char *n, T v) { return value_t(n, v); }
    static inline value_t last(void) { return value_t("", T(0)); }

    // usage
    static cstring toString(T v)
        { for(int i = 0; values[i].name; i++) if(v == values[i].value) return values[i].name; return "???"; }
    static T fromString(const string& name)
        { for(int i = 0; values[i].name; i++) if(name == values[i].name) return values[i].value; throw io::IOException("bad enum value"); }

    // iterator on values
    class iterator {
        friend struct enum_info;
    public:
        inline iterator(const iterator& it): i(it.i), vs(it.vs) { }
        iterator& operator++(void) { i++; return *this; }
        iterator& operator++(int) { i++; return *this; }
        inline bool operator==(const iterator& it) const
            { return vs == it.vs && (i == it.i || (it.i < 0 && !vs[i].name) || (i < 0 && !vs[it.i].name)); }
        inline bool operator!=(const iterator& it) const { return !operator==(it); }
        inline cstring name(void) const { return values[i].name; }
        inline T value(void) const { return values[i].value; }
    private:
        inline iterator(value_t *_vs, int _i): i(_i), vs(_vs) { }
        int i;
        value_t *vs;
    };
    inline static iterator begin(void) { return iterator(values, 0); }
    inline static iterator end(void) { return iterator(values, -1); }
};

} // elm

#endif /* ELM_ENUM_INFO_H_ */