/* {{{1
* Generate the canonical decomposition of ‘c’. The length of the
* decomposition is stored in ‘r_len’.
*/
unichar *
unicode_canonical_decomposition(unichar c, size_t *len)
{
const char *decomp;
unichar *r;
/* Hangul syllable */
if (c >= 0xac00 && c <= 0xd7af) {
decompose_hangul(c, NULL, len);
r = ALLOC_N(unichar, *len);
decompose_hangul(c, r, len);
} else if ((decomp = find_decomposition(c, false)) != NULL) {
*len = utf_length(decomp);
r = ALLOC_N(unichar, *len);
int i;
const char *p;
for (p = decomp, i = 0; *p != NUL; p = utf_next(p), i++)
r[i] = utf_char(p);
} else {
r = ALLOC(unichar);
*r = c;
*len = 1;
}
/* Supposedly following the Unicode 2.1.9 table means that the
* decompositions come out in canonical order. I haven't tested this,
* but we rely on it here. */
return r;
}
str_t utf_convert(heap_t h, str_t src, int src_enc, int dest_enc) {
str_t res = str_create(h, utf_length(src, src_enc)*4);
str_it_t src_i = str_begin(src),
src_e = str_end(src),
res_i = str_begin(res);
while(src_i<src_e) {
long c = CHAR_TO_LONG(src_i, src_enc);
src_i += CHAR_LEN(src_i, src_enc);
res_i = LONG_TO_UTF(c, res_i, dest_enc);
}
res->length = res_i - str_begin(res);
*res_i = 0;
return res;
}
void *utf_convert(heap_t h, void *src, int src_enc, int dest_enc) {
void *res;
void *i;
int len;
if(!src)
return 0;
err_reset();
len = utf_length(src, src_enc) + 1;
i = res = heap_alloc(h, len*4);
if(err())
return 0;
while(!CHAR_IS_LAST(src, src_enc)) {
long c = CHAR_TO_LONG(src, src_enc);
src = C_OFFSET(src, CHAR_LEN(src, src_enc));
i = LONG_TO_UTF(c, i, dest_enc);
}
i = UTF_WRITE4(i, 0, 0, 0, 0);
return res;
}
/* {{{1
* Normalize (compose/decompose) characters in ‘str˚ so that strings that
* actually contain the same characters will be recognized as equal for
* comparison for example.
*/
unichar *
_utf_normalize_wc(const char *str, size_t max_len, bool use_len, NormalizeMode mode)
{
bool do_compat = (mode == NORMALIZE_NFKC || mode == NORMALIZE_NFKD);
bool do_compose = (mode = NORMALIZE_NFC || mode == NORMALIZE_NFKC);
size_t n = 0;
const char *p = str;
while ((!use_len || p < str + max_len) && *p != NUL) {
unichar c = utf_char(p);
if (c >= 0xac00 && c <= 0xd7af) {
size_t len;
decompose_hangul(c, NULL, &len);
n += len;
} else {
const char *decomp = find_decomposition(c, do_compat);
n += (decomp != NULL) ? utf_length(decomp) : 1;
}
p = utf_next(p);
}
unichar *buf = ALLOC_N(unichar, n + 1);
size_t prev_start;
for (p = str, prev_start = 0, n = 0; (!use_len || p < str + max_len) && *p != NUL; p = utf_next(p)) {
unichar c = utf_char(p);
size_t prev_n = n;
if (c >= 0xac00 && c <= 0xd7af) {
size_t len;
decompose_hangul(c, buf + n, &len);
n += len;
} else {
const char *decomp = find_decomposition(c, do_compat);
if (decomp != NULL) {
for ( ; *decomp != NUL; decomp = utf_next(decomp))
buf[n++] = utf_char(decomp);
} else {
buf[n++] = c;
}
}
if (n > 0 && COMBINING_CLASS(buf[prev_n]) == 0) {
unicode_canonical_ordering(buf + prev_start, n - prev_start);
prev_start = prev_n;
}
}
if (n > 0) {
unicode_canonical_ordering(buf + prev_start, n - prev_start);
prev_start = n;
}
buf[n] = NUL;
/* done with decomposition and reordering */
if (do_compose && n > 0) {
prev_start = 0;
int prev_cc = 0;
for (size_t i = 0; i < n; i++) {
int cc = COMBINING_CLASS(buf[i]);
if (i > 0 && (prev_cc == 0 || prev_cc != cc) && combine(buf[prev_start], buf[i], &buf[prev_start])) {
for (size_t j = i + 1; j < n; j++)
buf[j - 1] = buf[j];
n--;
i--;
prev_cc = (i == prev_start) ? 0 : COMBINING_CLASS(buf[i - 1]);
} else {
if (cc == 0)
prev_start = i;
prev_cc = cc;
}
}
buf[n] = NUL;
}
return buf;
}
