/* Menes - C++ High-Level Utility Library
 * Copyright (C) 2004-2005  Jay Freeman (saurik)
*/

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef MENES_CSE_DIGITS_HPP
#define MENES_CSE_DIGITS_HPP

#include "cxx/platform.hpp"
#include "cse/linkage.hpp"

#ifdef MENES_PRAGMA_ONCE
#pragma once
#endif

#include "ext/foreach.hpp"
#include "ios/string.hpp"

namespace cse {

_finline unsigned FromDigit(cse::CodePoint digit) {
    if (digit >= '0' && digit <= '9')
        return digit - '0';
    else if (digit >= 'a' && digit <= 'z')
        return digit - 'a' + 10;
    else if (digit >= 'A' && digit <= 'Z')
        return digit - 'A' + 10;
    else throw;
}

template <unsigned Base_, typename Type_>
_finline Type_ FromDigits(const cse::String &digits) {
    Type_ value(0);
    _foreach (const cse::String, digit, digits)
        value = value * Base_ + FromDigit(*digit);
    return value;
}

template <unsigned Base_, typename Type_>
_finline cse::String ToDigits(const Type_ &value) {
    return _S<ios::String>() << ios::SetBase(Base_) << value;
}

}

#endif//MENES_CSE_DIGITS_HPP