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#include "truth_table.h"
int intpow(int b, int e) {
int acc = 1;
for (int i = 0; i < e; i++) {
acc *= b;
}
return acc;
}
struct expr_input_iter expr_input_iter_init(struct truth_table *tt) {
return (struct expr_input_iter){
.src = tt,
.acc = 0,
.count = 0,
};
}
int32_t expr_input_iter_next(struct expr_input_iter *self) {
uint32_t bak = self->acc;
if (self->count > self->src->lines_count-1) return -1;
for (int i = self->src->letters_count - 1; i >= 0; i--) {
uint8_t idx = self->src->letters[i] - 'a';
self->acc ^= 1 << idx;
if (self->acc & (1 << idx)) break;
}
self->count++;
return bak;
}
struct truth_table *truth_table_create(node *root, uint32_t letters_bitfield) {
struct truth_table *tt = calloc(1, sizeof(struct truth_table));
char letters[27] = {0};
char letters_needle = 0;
for (char i = 0; i <= ('z'-'a'); i++) {
if (letters_bitfield & (1 << i)) {
letters[letters_needle] = 'a'+i;
letters_needle++;
}
}
tt->letters = malloc(letters_needle * sizeof(char));
strncpy(tt->letters, letters, letters_needle);
tt->letters_count = letters_needle;
tt->lines_count = intpow(2,tt->letters_count);
tt->lines = malloc(tt->lines_count * sizeof(uint32_t));
struct expr_input_iter inp_iter = expr_input_iter_init(tt);
for (int i = 0; i < tt->lines_count; i++) {
int32_t input = expr_input_iter_next(&inp_iter);
uint8_t output = eval_tree(root, input);
tt->lines[i] = input | (output << 26);
}
return tt;
}
void truth_table_destroy(struct truth_table *tt) {
free(tt->lines);
free(tt->letters);
free(tt);
}
void truth_table_fprint(FILE *stream, struct truth_table *tt) {
fprintf(stream, "\t%s | S\n\t", tt->letters);
for (int i = 0; i < (tt->letters_count + 4); i++) putc('-', stream);
putc('\n', stream);
for (int i = 0; i < tt->lines_count; i++) {
putc('\t', stream);
uint32_t line = tt->lines[i];
for (int j = 0; j < tt->letters_count; j++) {
int actual_idx = tt->letters[j] - 'a';
putc((line & (1 << actual_idx))? '1' : '0', stream);
}
fprintf(stream, " | %c\n", (line & (1 << 26))? '1' : '0');
}
}
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