void ST_PrintNode(SUFFIX_TREE* tree, NODE* node1, long depth)
{
NODE* node2 = node1->sons;
long d = depth , start = node1->edge_label_start , end;
end = get_node_label_end(tree, node1);
if(depth>0)
{
/* Print the branches coming from higher nodes */
while(d>1)
{
printf("|");
d--;
}
printf("+");
/* Print the node itself */
while(start<=end)
{
printf("%c",tree->tree_string[start]);
start++;
}
#ifdef DEBUG
printf(" \t\t\t(%lu,%lu | %lu)",node1->edge_label_start,end,node1->path_position);
#endif
printf("\n");
}
/* Recoursive call for all node1's sons */
while(node2!=0)
{
ST_PrintNode(tree,node2, depth+1);
node2 = node2->right_sibling;
}
}
void SuffixTree_print_node(SuffixTree_T tree, Node_T node1, long depth)
{
Node_T node2 = node1->left_son;
long d = depth , start = node1->edge_label_start , end;
end = get_node_label_end(tree, node1);
long orig_start = start;
if(depth>0)
{
/* Print the branches coming from higher nodes */
while(d>1)
{
printf("|");
d--;
}
printf("+");
/* Print the node itself */
while(start<=end)
{
printf("%c",tree->tree_string[start]);
start++;
}
printf("\t%zu\t%ld\t%ld\t%ld\t%ld", node1->index, orig_start,
end, node1->path_position, node1->edge_depth);
printf("\n");
}
/* Recoursive call for all node1's sons */
while(node2!=0)
{
SuffixTree_print_node(tree,node2, depth+1);
node2 = node2->right_sibling;
}
}
DBL_WORD ST_FindSubstring(
/* The suffix array */
SUFFIX_TREE* tree,
/* The substring to find */
char* W,
/* The length of W */
DBL_WORD P)
{
/* Starts with the root's son that has the first character of W as its
incoming edge first character */
NODE* node = find_son(tree, tree->root, W[0]);
DBL_WORD k,j = 0, node_label_end;
/* Scan nodes down from the root untill a leaf is reached or the substring is
found */
while(node!=0)
{
k=node->edge_label_start;
node_label_end = get_node_label_end(tree,node);
/* Scan a single edge - compare each character with the searched string */
while(j<P && k<=node_label_end && tree->tree_string[k] == W[j])
{
j++;
k++;
#ifdef STATISTICS
counter++;
#endif
}
/* Checking which of the stopping conditions are true */
if(j == P)
{
/* W was found - it is a substring. Return its path starting index */
return node->path_position;
}
else if(k > node_label_end)
/* Current edge is found to match, continue to next edge */
node = find_son(tree, node, W[j]);
else
{
/* One non-matching symbols is found - W is not a substring */
return ST_ERROR;
}
}
return ST_ERROR;
}
void ST_PrintFullNode(SUFFIX_TREE* tree, NODE* node)
{
long start, end;
if(node==NULL)
return;
/* Calculating the begining and ending of the last edge */
start = node->edge_label_start;
end = get_node_label_end(tree, node);
/* Stoping condition - the root */
if(node->father!=tree->root)
ST_PrintFullNode(tree,node->father);
/* Print the last edge */
while(start<=end)
{
printf("%c",tree->tree_string[start]);
start++;
}
}
SuffixTreeIndex_T SuffixTree_find_substring(const SuffixTree_T tree,
char* query,
SuffixTreeIndex_T query_length)
{
/* Starts with the root's son that has the first character of W as its
incoming edge first character */
Node_T node = find_son(tree, tree->root, query[0]);
SuffixTreeIndex_T k,j = 0, node_label_end;
/* Scan nodes down from the root untill a leaf is reached or the substring is
found */
while(node != NULL)
{
k=node->edge_label_start;
node_label_end = get_node_label_end(tree,node);
/* Scan a single edge - compare each character with the searched string */
while(j<query_length && k<=node_label_end && tree->tree_string[k] == query[j])
{
j++;
k++;
}
/* Checking which of the stopping conditions are true */
if(j == query_length)
{
/* W was found - it is a substring. Return its path starting index */
return node->path_position;
}
else if(k > node_label_end)
/* Current edge is found to match, continue to next edge */
node = find_son(tree, node, query[j]);
else
{
/* One non-matching symbols is found - W is not a substring */
return (SuffixTreeIndex_T)-1;
}
}
return (SuffixTreeIndex_T)-1;
}
void SEA(
SUFFIX_TREE* tree,
POS* pos,
PATH str,
DBL_WORD* rule_applied,
char after_rule_3)
{
DBL_WORD chars_found = 0 , path_pos = str.begin;
NODE* tmp;
#ifdef DEBUG
ST_PrintTree(tree);
printf("extension: %lu phase+1: %lu",str.begin, str.end);
if(after_rule_3 == 0)
printf(" followed from (%lu,%lu | %lu) ", pos->node->edge_label_start, get_node_label_end(tree,pos->node), pos->edge_pos);
else
printf(" starting at (%lu,%lu | %lu) ", pos->node->edge_label_start, get_node_label_end(tree,pos->node), pos->edge_pos);
#endif
#ifdef STATISTICS
counter++;
#endif
/* Follow suffix link only if it's not the first extension after rule 3 was applied */
if(after_rule_3 == 0)
follow_suffix_link(tree, pos);
#ifdef DEBUG
#ifdef STATISTICS
if(after_rule_3 == 0)
printf("to (%lu,%lu | %lu). counter: %lu\n", pos->node->edge_label_start, get_node_label_end(tree,pos->node),pos->edge_pos,counter);
else
printf(". counter: %lu\n", counter);
#endif
#endif
/* If node is root - trace whole string starting from the root, else - trace last character only */
if(pos->node == tree->root)
{
pos->node = trace_string(tree, tree->root, str, &(pos->edge_pos), &chars_found, no_skip);
}
else
{
str.begin = str.end;
chars_found = 0;
/* Consider 2 cases:
1. last character matched is the last of its edge */
if(is_last_char_in_edge(tree,pos->node,pos->edge_pos))
{
/* Trace only last symbol of str, search in the NEXT edge (node) */
tmp = find_son(tree, pos->node, tree->tree_string[str.end]);
if(tmp != 0)
{
pos->node = tmp;
pos->edge_pos = 0;
chars_found = 1;
}
}
/* 2. last character matched is NOT the last of its edge */
else
{
/* Trace only last symbol of str, search in the CURRENT edge (node) */
if(tree->tree_string[pos->node->edge_label_start+pos->edge_pos+1] == tree->tree_string[str.end])
{
pos->edge_pos++;
chars_found = 1;
}
}
}
/* If whole string was found - rule 3 applies */
if(chars_found == str.end - str.begin + 1)
{
*rule_applied = 3;
/* If there is an internal node that has no suffix link yet (only one may
exist) - create a suffix link from it to the father-node of the
current position in the tree (pos) */
if(suffixless != 0)
{
create_suffix_link(suffixless, pos->node->father);
/* Marks that no internal node with no suffix link exists */
suffixless = 0;
}
#ifdef DEBUG
printf("rule 3 (%lu,%lu)\n",str.begin,str.end);
#endif
return;
}
/* If last char found is the last char of an edge - add a character at the
next edge */
if(is_last_char_in_edge(tree,pos->node,pos->edge_pos) || pos->node == tree->root)
{
/* Decide whether to apply rule 2 (new_son) or rule 1 */
if(pos->node->sons != 0)
{
/* Apply extension rule 2 new son - a new leaf is created and returned
by apply_extension_rule_2 */
apply_extension_rule_2(pos->node, str.begin+chars_found, str.end, path_pos, 0, new_son);
*rule_applied = 2;
/* If there is an internal node that has no suffix link yet (only one
may exist) - create a suffix link from it to the father-node of the
current position in the tree (pos) */
if(suffixless != 0)
{
create_suffix_link(suffixless, pos->node);
/* Marks that no internal node with no suffix link exists */
suffixless = 0;
}
}
}
else
{
/* Apply extension rule 2 split - a new node is created and returned by
apply_extension_rule_2 */
tmp = apply_extension_rule_2(pos->node, str.begin+chars_found, str.end, path_pos, pos->edge_pos, split);
if(suffixless != 0)
create_suffix_link(suffixless, tmp);
/* Link root's sons with a single character to the root */
if(get_node_label_length(tree,tmp) == 1 && tmp->father == tree->root)
{
tmp->suffix_link = tree->root;
/* Marks that no internal node with no suffix link exists */
suffixless = 0;
}
else
/* Mark tmp as waiting for a link */
suffixless = tmp;
/* Prepare pos for the next extension */
pos->node = tmp;
*rule_applied = 2;
}
}
DBL_WORD get_node_label_length(SUFFIX_TREE* tree, NODE* node)
{
/* Calculate and return the lentgh of the node */
return get_node_label_end(tree, node) - node->edge_label_start + 1;
}
int Node_is_leaf(Node_T node, SuffixTree_T tree) {
return get_node_label_end(tree, node) == tree->e;
}
SuffixTreeIndex_T Node_get_incoming_edge_length(Node_T node, SuffixTree_T tree)
{
return get_node_label_end(tree, node) - node->edge_label_start + 1;
}
SuffixTreeIndex_T get_node_label_length(SuffixTree_T tree, Node_T node)
{
/* Calculate and return the lentgh of the node */
return get_node_label_end(tree, node) - node->edge_label_start + 1;
}
