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#ifndef ISL_TARJAN_H
#define ISL_TARJAN_H
/* Structure for representing the nodes in the graph being traversed
* using Tarjan's algorithm.
* index represents the order in which nodes are visited.
* min_index is the index of the root of a (sub)component.
* on_stack indicates whether the node is currently on the stack.
*/
struct isl_tarjan_node {
int index;
int min_index;
int on_stack;
};
/* Structure for representing the graph being traversed
* using Tarjan's algorithm.
* len is the number of nodes
* node is an array of nodes
* stack contains the nodes on the path from the root to the current node
* sp is the stack pointer
* index is the index of the last node visited
* order contains the elements of the components separated by -1
* op represents the current position in order
*/
struct isl_tarjan_graph {
int len;
struct isl_tarjan_node *node;
int *stack;
int sp;
int index;
int *order;
int op;
};
struct isl_tarjan_graph *isl_tarjan_graph_init(isl_ctx *ctx, int len,
isl_bool (*follows)(int i, int j, void *user), void *user);
struct isl_tarjan_graph *isl_tarjan_graph_component(isl_ctx *ctx, int len,
int node, isl_bool (*follows)(int i, int j, void *user), void *user);
struct isl_tarjan_graph *isl_tarjan_graph_free(struct isl_tarjan_graph *g);
#endif
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