enumerate-balanced-ideals/thickenings.h

#ifndef THICKENINGS_H
#define THICKENINGS_H

#include "coxeter.h"

#define DEBUG(msg, ...) do{fprintf(stderr, msg, ##__VA_ARGS__); }while(0)

#define MAX_THICKENINGS 0 // 0 means infinite
#define HEAD_MARKER 127

typedef struct _edgelist {
  int to;
  struct _edgelist *next;
} edgelist_t;

// describes an element of the Coxeter group; only "opposite" and "bruhat_lower" are being used for enumerating thickenings; everything else is just needed for initialization or output
typedef struct {
  int *word;
  int wordlength;
  int *left;
  int *right;
  int opposite;
  edgelist_t *bruhat_lower;
  edgelist_t *bruhat_higher;
  int is_hyperplane_reflection; // boolean value
} node_t;

char *alphabetize(int *word, int len, const char *alphabet, char *buffer);
void print_thickening(int rank, int order, const signed char *thickening, int level, const char *alphabet, FILE *f);
static int compare_wordlength(const void *a, const void *b, void *gr);
void prepare_graph(semisimple_type_t type, node_t *graph, edgelist_t **edgelists_pointer, int **words_pointer);
long enumerate_balanced_thickenings(semisimple_type_t type, node_t *graph, int size, const char *alphabet, FILE *outfile);

#endif