symbol.h

// Copyright (c) 2009, Nicholas "Indy" Ray. All rights reserved.
// See the LICENSE file for usage, modification, and distribution terms.
#ifndef _SYMBOL_H_
#define _SYMBOL_H_

#include <cstring>

struct symbol_table;

const int invalid_symbol = -1;
const char initial_symbol_table_size = 20;

struct symbol
{
    int Id;
    symbol(int i) : Id(i)
    {}
    symbol() : Id(invalid_symbol)
    {}

    bool operator==(const symbol& Othr)
    {
        return Id == Othr.Id;
    }
};

struct sym_cmp
{
    bool operator()(symbol s1, symbol s2) const
    {
        return s1.Id < s2.Id;
    }
};

symbol_table* init_symbol_table();
void destroy_symbol_table(symbol_table* tbl);
symbol symbol_from_string(symbol_table* tbl, const char* string);
symbol symbol_from_string(symbol_table* tbl, const char* string, size_t len);
const char* string_from_symbol(symbol_table* tbl, symbol sym);

#endif //_SYMBOL_H_