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/* Starshatter: The Open Source Project
Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
AUTHOR: John DiCamillo
OVERVIEW
========
Implementation of the Dictionary class
*/
#ifndef NDEBUG
#define DICT_CHECK(a, b) if ((a) == 0) throw b;
#else
#define DICT_CHECK(a, b)
#endif
const int CHAINS = 256;
// +-------------------------------------------------------------------+
template <class T> Dictionary<T>::Dictionary()
: items(0)
{ init(); }
template <class T> Dictionary<T>::~Dictionary()
{ clear(); }
// +-------------------------------------------------------------------+
template <class T>
void Dictionary<T>::init()
{
items = 0;
memset(table, 0, CHAINS*sizeof(PTR));
}
template <class T>
void Dictionary<T>::clear()
{
for (int i = 0; i < CHAINS; i++) {
DictionaryCell<T>* link = table[i];
while (link) {
DictionaryCell<T>* n = link->next;
delete link;
link = n;
}
}
init();
}
// +-------------------------------------------------------------------+
template <class T>
T& Dictionary<T>::operator[](const Text& key)
{
int idx = key.hash() % CHAINS;
DictionaryCell<T>* cell = table[idx];
if (cell == 0) { // empty chain
items++;
cell = new DictionaryCell<T>(key);
table[idx] = cell;
return cell->value;
}
else { // search for key
while (cell->next && cell->key != key)
cell = cell->next;
if (cell->key != key) { // not found in chain
items++;
cell->next = new DictionaryCell<T>(key);
return cell->next->value;
}
else { // found: return it!
return cell->value;
}
}
}
// +-------------------------------------------------------------------+
template <class T>
void Dictionary<T>::insert(const Text& key, const T& val)
{
T& value = operator[](key);
value = val;
}
// +-------------------------------------------------------------------+
template <class T>
void Dictionary<T>::remove(const Text& key)
{
int idx = key.hash() % CHAINS;
DictionaryCell<T>* cell = table[idx];
if (cell == 0) { // empty chain
return;
}
else { // search for key
while (cell->next && cell->key != key)
cell = cell->next;
if (cell->key != key) { // not found in chain
return;
}
else { // found: remove it!
if (table[idx] == cell) {
table[idx] = cell->next;
delete cell;
}
else {
DictionaryCell<T>* p = table[idx];
while (p->next != cell)
p = p->next;
p->next = cell->next;
delete cell;
}
}
}
}
// +-------------------------------------------------------------------+
template <class T>
int Dictionary<T>::contains(const Text& key) const
{
int idx = key.hash() % CHAINS;
DictionaryCell<T>* cell = table[idx];
if (cell != 0) {
while (cell->next && cell->key != key)
cell = cell->next;
if (cell->key == key)
return 1;
}
return 0;
}
// +-------------------------------------------------------------------+
template <class T>
T Dictionary<T>::find(const Text& key, T defval) const
{
int idx = key.hash() % CHAINS;
DictionaryCell<T>* cell = table[idx];
if (cell != 0) {
while (cell->next && cell->key != key)
cell = cell->next;
if (cell->key == key)
return cell->value;
}
return defval;
}
// +-------------------------------------------------------------------+
template <class T> DictionaryIter<T>::DictionaryIter(Dictionary<T>& d)
: dict(&d), chain(0), here(0)
{ }
template <class T> DictionaryIter<T>::~DictionaryIter()
{ }
// +-------------------------------------------------------------------+
template <class T>
void DictionaryIter<T>::reset()
{
chain = 0;
here = 0;
}
// +-------------------------------------------------------------------+
template <class T>
Text DictionaryIter<T>::key() const
{
return here->key;
}
template <class T>
T DictionaryIter<T>::value() const
{
return here->value;
}
// +-------------------------------------------------------------------+
template <class T>
int DictionaryIter<T>::operator++()
{
forth();
int more = chain < CHAINS;
return more;
}
// +-------------------------------------------------------------------+
template <class T>
void DictionaryIter<T>::forth()
{
if (here) {
here = here->next;
if (!here) // off the end of this chain
chain++;
}
if (!here) {
while (!dict->table[chain] && chain < CHAINS)
chain++;
if (chain < CHAINS)
here = dict->table[chain];
else
here = 0;
}
}
// +-------------------------------------------------------------------+
template <class T>
void DictionaryIter<T>::attach(Dictionary<T>& d)
{
dict = &d;
reset();
}
// +-------------------------------------------------------------------+
template <class T>
Dictionary<T>& DictionaryIter<T>::container()
{
return *dict;
}
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