47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
#ifndef THICKENINGS_H
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#define THICKENINGS_H
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#include "coxeter.h"
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#define DEBUG(msg, ...) do{fprintf(stderr, msg, ##__VA_ARGS__); }while(0)
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#define MAX_THICKENINGS 0 // 0 means infinite
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#define HEAD_MARKER 127
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typedef struct _edgelist {
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int to;
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struct _edgelist *next;
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} edgelist_t;
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// 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
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typedef struct {
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int *word;
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int wordlength;
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int *left;
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int *right;
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int opposite;
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edgelist_t *bruhat_lower;
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edgelist_t *bruhat_higher;
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int is_hyperplane_reflection; // boolean value
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} node_t;
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// printing functions
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char *alphabetize(int *word, int len, const char *alphabet, char *buffer);
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void print_thickening(int rank, int order, const signed char *thickening, int level, const char *alphabet, FILE *f);
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// generating the graph of the bruhat order
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void prepare_graph(semisimple_type_t type, node_t *graph);
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int prepare_simplified_graph(semisimple_type_t type, unsigned long left, unsigned long right, node_t *simplified_graph);
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// enumerate balanced thickenings
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long enumerate_balanced_thickenings(semisimple_type_t type, node_t *graph, int size, const char *alphabet, FILE *outfile);
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node_t *graph_alloc(semisimple_type_t type);
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void graph_free(semisimple_type_t type, node_t *graph);
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// various helper functions
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static int compare_wordlength(const void *a, const void *b, void *gr);
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static int edgelist_contains(edgelist_t *list, int x);
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static edgelist_t *edgelist_add(edgelist_t *list, int new, edgelist_t *storage, int *storage_index);
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#endif
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