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#ifndef MARKOV_H
#define MARKOV_H
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
extern int ITEMS;
extern double chain[][ITEM_CAP];
extern char item_names[][64];
void generate_chain()
{
char *file_path = NULL;
#ifdef FILE_PATH
file_path = FILE_PATH;
#endif
FILE *fp = fopen(file_path, "r");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file %s\n", file_path);
exit(EXIT_FAILURE);
}
int items_seen[ITEM_CAP][ITEM_CAP] = {0};
int cur_item = -1;
char word[256] = {0};
char ch;
while((ch = fgetc(fp)) != EOF)
{
if(ch != ' ' && ch != ',' && ch != '"' &&
ch != '\n' && ch != '[' && ch != ']' &&
ch != '!' && ch != '?' && ch != '.') {
word[strlen(word)] = tolower(ch);
continue;
}
if(strlen(word) == 0) goto manage_cur_item;
int item = ITEMS;
for(int i = 0; i < ITEMS; i++) {
if(strcmp(word, item_names[i]) == 0)
item = i;
}
if(item == ITEMS) {
ITEMS++;
strcpy(item_names[item], word);
}
if(cur_item != -1)
items_seen[cur_item][item]++;
cur_item = item;
manage_cur_item:
if(ch == '\n' || ch == '[' || ch == ']' ||
ch == '!' || ch == '?' || ch == '.')
cur_item = -1;
memset(word, 0, sizeof(word));
}
fclose(fp);
for(int i = 0; i < ITEMS; i++)
{
int all = 0;
for(int j = 0; j < ITEMS; j++)
all += items_seen[i][j];
if(all == 0) continue;
for(int j = 0; j < ITEMS; j++)
chain[i][j] = (double)items_seen[i][j]/all;
}
}
int walk_step(int item)
{
int item_lim = 0;
int r = rand();
for(int i = 0; i < ITEMS; i++)
{
item_lim += RAND_MAX * chain[item][i];
if(r <= item_lim) return i;
}
return -1;
}
void take_walk()
{
#ifdef SAVE_TO_FILE_ON_WALK
FILE *fp = fopen(SAVE_TO_FILE_ON_WALK, "w");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file %s\n", SAVE_TO_FILE_ON_WALK);
exit(EXIT_FAILURE);
}
#endif
int items_seen[ITEM_CAP] = {0};
int cur_item = rand() % ITEMS;
for(size_t i = 0; i < WALK_LEN; i++)
{
#ifdef PRINT_ON_WALK
printf("%s ", item_names[cur_item]);
#endif
#ifdef SAVE_TO_FILE_ON_WALK
fprintf(fp, "%s ", item_names[cur_item]);
#endif
items_seen[cur_item]++;
int ni = walk_step(cur_item);
cur_item = ni;
if(ni == -1)
{
cur_item = rand() % ITEMS;
#ifdef PRINT_ON_WALK
printf("\n");
#endif
#ifdef SAVE_TO_FILE_ON_WALK
fprintf(fp, "\n");
#endif
}
}
#ifdef PRINT_ON_WALK
printf("\n");
#endif
#ifdef SAVE_TO_FILE_ON_WALK
fclose(fp);
printf("Saved file with %d items at %s\n", WALK_LEN, SAVE_TO_FILE_ON_WALK);
#endif
#ifdef PRINT_ITEM_FREQUENCY
puts("Item Frequency:");
for(int i = 0; i < ITEMS; i++)
printf("%f %s\n", (double)items_seen[i]/WALK_LEN, item_names[i]);
puts("");
#endif
}
void print_chain()
{
puts("Chain Matrix:");
for(int i = 0; i < ITEMS; i++)
{
printf("{");
for(int j = 0; j < ITEMS; j++)
printf(" %f,", chain[i][j]);
printf("}\n");
}
puts("");
}
#endif
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