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#ifndef SYMBOL_H
  #define SYMBOL_H

  #include <QtCore/QString>
  #include <cstring>

  #include <QtCore/QHash>
  #include <QtCore/QPair>

struct NameSymbol {
  const char* data;
  std::size_t count;

  inline QString as_string() const { return QString::fromUtf8(data, (int)count); }

  inline bool operator==(const NameSymbol& other) const
  {
    return count == other.count && std::strncmp(data, other.data, count) == 0;
  }

protected:
  inline NameSymbol() {}
  inline NameSymbol(const char* d, std::size_t c)
    : data(d)
    , count(c)
  {
  }

private:
  void operator=(const NameSymbol&);

  friend class NameTable;
};

inline uint qHash(const NameSymbol& r)
{
  uint hash_value = 0;

  for (std::size_t i = 0; i < r.count; ++i)
    hash_value = (hash_value << 5) - hash_value + r.data[i];

  return hash_value;
}

inline uint qHash(const QPair<const char*, std::size_t>& r)
{
  uint hash_value = 0;

  for (std::size_t i = 0; i < r.second; ++i)
    hash_value = (hash_value << 5) - hash_value + r.first[i];

  return hash_value;
}

class NameTable
{
public:
  typedef QPair<const char*, std::size_t> KeyType;
  typedef QHash<KeyType, NameSymbol*> ContainerType;

public:
  NameTable() {}

  ~NameTable() { qDeleteAll(_M_storage); }

  inline const NameSymbol* findOrInsert(const char* str, std::size_t len)
  {
    KeyType key(str, len);

    NameSymbol* name = _M_storage.value(key);
    if (!name) {
      name = new NameSymbol(str, len);
      _M_storage.insert(key, name);
    }

    return name;
  }

  inline std::size_t count() const { return _M_storage.size(); }

private:
  ContainerType _M_storage;

private:
  NameTable(const NameTable& other);
  void operator=(const NameTable& other);
};

#endif // SYMBOL_H

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