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#ifndef TRIE_H
#define TRIE_H
#include <iostream>
#include <cstring>
#include <cstdlib>
template <class T>
struct trie_node {
char c;
T* value = NULL;
trie_node<T>* next = nullptr;
trie_node<T>* child = nullptr;
trie_node (char c) : c(c) { };
trie_node (char c, trie_node<T>* next, trie_node<T>* child);
};
template <class T>
std::ostream& operator<<(std::ostream&, trie_node<T>* node);
template <class T>
struct trie {
trie_node<T>* root;
trie () : root (new trie_node<T> ('\0')) { }
int push (const char* key, T* item);
T* operator[] ( const char* key );
bool empty () { return this->root->child == NULL; }
};
template <class T>
std::ostream& operator<<(std::ostream&, trie<T>* trie);
template <class T>
trie_node<T>::trie_node (char c, trie_node<T>* next, trie_node<T>* child) {
this->c = c;
this->next = next;
this->child = child;
}
template <class T>
int trie<T>::push (const char* key, T* item) {
trie_node<T> *cur, *last;
last = this->root;
cur = last->child;
// TODO subkey is never collected
char* subkey = static_cast<char*>(malloc(strlen(key)));
strcpy (subkey, key);
while (true) {
if (cur == NULL) {
/* Build direct LL for remaining subkey */
for (char* c = subkey; c[0] != '\0'; c++) {
// NEW(TRIE_NODE(TYPE), t, *c);
auto t = new trie_node<T>(*c);
last->child = t;
last = t;
}
// TODO fix resolve
// last->value = RESOLVE(TYPE)(last->value, val);
last->value = item;
return 0;
} else if (cur->c == subkey[0]) {
/* This node belongs to the key,
* Decend further */
last = cur;
cur = cur->child;
subkey++;
} else if (subkey[0] == '\0') {
/* Key finished */
// TODO fix resolve
// last->value = RESOLVE(TYPE)(last->value, val);
last->value = item;
return 0;
} else if (cur->next != NULL) {
/* This node was not part of the set, but it's sibling might */
cur = cur->next;
/* `last` not set since we aren't moving down */
} else {
/* No node on self level was part of the set, create a new__
* sibling and follow down that parse */
// NEW(TRIE_NODE(TYPE), t, *subkey);
auto t = new trie_node<T>(*subkey);
cur->next = t;
last = cur;
cur = t;
}
}
}
template <class T>
T* trie<T>::operator[] (const char* key) {
trie_node<T>* n = this->root->child;
// TODO subkey is never collected
char* subkey = static_cast<char*>(malloc(strlen(key)));
strcpy (subkey, key);
while (n != NULL) {
if (subkey[1] == '\0') {
return n->value;
} else if (subkey[0] == n->c) {
n = n->child;
subkey++;
} else {
n = n->next;
}
}
// ERR("Position not found");
// return 0;
return nullptr;
}
template <class T>
std::ostream& operator<<(std::ostream& o, trie_node<T>* node) {
#if 0
va_list ap;
va_start(ap, buf);
int argc = va_arg(ap, int);
int depth = argc >= 1
? va_arg(ap, int)
: 0;
va_end(ap);
int seek = 0;
#endif
// TODO figure out depth
int depth = 1;
trie_node<T>* n = node;
if (n == NULL) { o << std::endl; }
while (n != NULL) {
o << '|';
for (int i = 0; i < depth; i++) o << ' ';
o << (n->c == '\0' ? '0' : n->c);
if (n->value != NULL) {
o << n->value << std::endl;
}
if (n->child != NULL) {
o << std::endl;
o << n->child; // depth + 1
}
n = n->next;
}
return o;
}
template <class T>
std::ostream& operator<<(std::ostream& o, trie<T>* trie) {
o << "Trie: " << trie << " {\n";
o << trie->root->child;
o << "}";
return o;
}
#endif /* TRIE_H */
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