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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
extern const struct string_token {
char *s;
int t;
} strings[];
extern const size_t nstrings;
extern const uint8_t char_to_bit[];
struct level {
uint64_t bit_mask;
uint64_t *token_masks;
};
#define MAPPED_CHARS 32
static struct level start_level = {0};
static struct level *bit_to_ptr[MAPPED_CHARS] = {0};
static size_t num_levels;
#define CHAR_TO_PTR(c) (bit_to_ptr[char_to_bit[c]])
#define popcount(x) (__builtin_popcount(x))
int dict_compile(void)
{
// max number of levels
for(size_t i = 0; i < nstrings; i++)
if(strlen(strings[i].s) > num_levels) num_levels = strlen(strings[i].s);
// allocated levels
for(size_t i = 0; i < MAPPED_CHARS; i++) {
bit_to_ptr[i] = calloc(num_levels, sizeof(*bit_to_ptr[i]));
if(!bit_to_ptr[i]) return 1;
}
// BUG: everything is repeated for the start_level
// populate bit_masks
for(size_t i = 0; i < nstrings; i++) {
struct level *l = &start_level;
for(size_t j = 0; j < strlen(strings[i].s)+1; j++) {
uint8_t bit = char_to_bit[strings[i].s[j]];
l->bit_mask |= 1 << bit;
l = &bit_to_ptr[bit][j];
}
}
// allocate token_masks
// NOTE: start_level alloc'd many times, so realloc is used
for(size_t i = 0; i < MAPPED_CHARS; i++) {
struct level *l = &start_level;
for(size_t j = 0; j < num_levels + 1; j++) {
l->token_masks = realloc(l->token_masks, popcount(l->bit_mask)
* sizeof(*l->token_masks));
memset(l->token_masks, 0, popcount(l->bit_mask)
* sizeof(*l->token_masks));
l = &bit_to_ptr[i][j];
}
}
// populate token_masks
for(size_t i = 0; i < nstrings; i++) {
struct level *l = &start_level;
for(size_t j = 0; j < strlen(strings[i].s)+1; j++) {
uint8_t bit = char_to_bit[strings[i].s[j]];
uint8_t idx = popcount(l->bit_mask & ((1 << bit) - 1));
l->token_masks[idx] |= 1 << strings[i].t;
l = &bit_to_ptr[bit][j];
}
}
return 0;
}
void dict_print(void)
{
for(size_t i = 0; i < 256; i++)
for(size_t j = 0; j < num_levels; j++)
if(CHAR_TO_PTR(i)[j].bit_mask) {
printf("%c, %zu, %32lb ", (char)i, j, CHAR_TO_PTR(i)[j].bit_mask);
printf("{ ");
for(size_t k = 0; k < popcount(CHAR_TO_PTR(i)[j].bit_mask); k++)
printf("%lb ", CHAR_TO_PTR(i)[j].token_masks[k]);
printf(" }\n");
}
printf(" %32lb ", start_level.bit_mask);
printf("{ ");
for(size_t k = 0; k < popcount(start_level.bit_mask); k++)
printf("%lb ", start_level.token_masks[k]);
printf(" }\n");
printf(" %32s\n", "zyxwvutsrqponmlkjihgfedcbaE ");
}
void dict_free(void)
{
free(start_level.token_masks);
for(size_t i = 0; i < MAPPED_CHARS; i++) {
for(size_t j = 0; j < num_levels; j++) {
if(bit_to_ptr[i][j].token_masks)
free(bit_to_ptr[i][j].token_masks);
}
free(bit_to_ptr[i]);
}
}
int dict_check(char *string)
{
uint64_t token_mask = ~(uint64_t)0;
for(size_t i = 0; i < strlen(string) + 1; i++) {
struct level *l = (i == 0)
? &start_level
: &bit_to_ptr[char_to_bit[string[i-1]]][i-1];
uint8_t bit = char_to_bit[string[i]];
if((l->bit_mask & (1 << bit)) == 0) return -1;
uint64_t idx = popcount(l->bit_mask & ((1 << bit) - 1));
token_mask &= l->token_masks[idx];
}
if(token_mask) return __builtin_ctz(token_mask);
else return -1;
}
#ifdef _DICT_STANDALONE
#define TOKENS(X) \
X(TOKEN_NONE) \
X(TOKEN_TEST) \
X(TOKEN_RETARDED) \
X(TOKEN_WOW) \
X(TOKEN_TITS) \
X(TOKEN_RPAREN) \
X(TOKEN_LPAREN)
#define TOKEN_ENUM(a) a,
#define TOKEN_STRING(a) #a,
enum token {
TOKENS(TOKEN_ENUM)
};
const char * const token_to_string[] = {
TOKENS(TOKEN_STRING)
};
const struct string_token strings[] = {
{"test", TOKEN_TEST},
{"retarded", TOKEN_RETARDED},
{"wow", TOKEN_WOW},
{"tits", TOKEN_TITS},
};
const size_t nstrings = 4;
const uint8_t char_to_bit[256] = {
['a'] = 2, ['b'] = 3, ['c'] = 4, ['d'] = 5, ['e'] = 6, ['f'] = 7,
['g'] = 8, ['h'] = 9, ['i'] = 10, ['j'] = 11, ['k'] = 12, ['l'] = 13,
['m'] = 14, ['n'] = 15, ['o'] = 16, ['p'] = 17, ['q'] = 18, ['r'] = 19,
['s'] = 20, ['t'] = 21, ['u'] = 22, ['v'] = 23, ['w'] = 24, ['x'] = 25,
['y'] = 26, ['z'] = 27, [ 0 ] = 1, [' '] = 1
};
int main(void)
{
dict_compile();
int t;
if((t = dict_check("tits")) >= 0) printf("%s\n", token_to_string[t]);
if((t = dict_check("retarded")) >= 0) printf("%s\n", token_to_string[t]);
if((t = dict_check("test2")) >= 0) printf("%s\n", token_to_string[t]);
if((t = dict_check("tes")) >= 0) printf("%s\n", token_to_string[t]);
dict_free();
}
#endif
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