metacall/mc_token.cpp

//
// Copyright (c) 2011 Alex Yatskov
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//

#include "metacall.hpp"

namespace metacall {


//
// Token
//

Token::Token(const char value[]) :
    m_value(hash(value))
{
}

Token::Token(unsigned value) :
    m_value(value)
{
}

Token::operator unsigned() const {
    return m_value;
}

unsigned Token::hash(const char str[]) {
    // metacall uses the djb2 string hash, see
    // http://www.cse.yorku.ca/~oz/hash.html
    unsigned hash = 5381;
    for (const char* ptr = str; *ptr != 0; ++ptr) {
        hash = (hash << 5) + hash + *ptr;
    }

    return hash;
}


}