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#include <errno.h>
#include <stdckdint.h>
#include "_attrs.h"
#include "macros.h"
#include "mbstring.h"
#include "unicode/prop.h"
#include "unicode/string.h"
constexpr rune COMB_DOT_ABOVE = 0x0307;
[[unsequenced, _mlib_inline]]
static inline bool
uprop_ccc_0_or_230(rune ch)
{
enum uprop_ccc x = uprop_get_ccc(ch);
return x == 0 || x == 230;
}
char8_t *
u8title(size_t *dstn, struct u8view sv, enum caseflags flags, alloc_fn alloc,
void *alloc_ctx)
{
ASSUME(dstn != nullptr);
ASSUME(alloc != nullptr);
struct tcctx ctx_t;
struct lcctx ctx_l;
ctx_t.az_or_tr = ctx_l.az_or_tr = flags & CF_LANG_AZ;
ctx_t.lt = ctx_l.lt = flags & CF_LANG_LT;
rune ch;
bool nl_IJ = false;
size_t n, before_dot_cnt, more_above_cnt;
struct u8view word = {}, wcpy = sv;
struct {
bool before;
size_t after;
} final_sigma = {};
enum {
TITLE,
BETWEEN,
LOWER,
} state = 0;
n = before_dot_cnt = more_above_cnt = 0;
size_t bufsz;
if (ckd_mul(&bufsz, sv.len, (size_t)U8TITLE_SCALE)) {
errno = EOVERFLOW;
return nullptr;
}
char8_t *dst = alloc(alloc_ctx, nullptr, 0, bufsz, 1, alignof(char8_t));
while (u8next(&ch, &sv)) {
if (sv.p > word.p + word.len) {
u8wnext(&word, &wcpy);
ctx_t.after_soft_dotted = false;
state = TITLE;
}
if (ctx_l.az_or_tr || ctx_l.lt) {
if (before_dot_cnt == 0 || more_above_cnt == 0) {
rune ch = 0;
before_dot_cnt = more_above_cnt = 0;
struct u8view cpy = sv;
do {
before_dot_cnt++;
more_above_cnt++;
} while (u8next(&ch, &cpy) && !uprop_ccc_0_or_230(ch));
if (ch != COMB_DOT_ABOVE)
before_dot_cnt = 0;
if (uprop_get_ccc(ch) != 230)
more_above_cnt = 0;
} else {
before_dot_cnt--;
more_above_cnt--;
}
}
if (final_sigma.after == 0) {
rune ch = 0;
struct u8view cpy = sv;
do
final_sigma.after++;
while (u8next(&ch, &cpy) && uprop_is_ci(ch));
if (!uprop_is_cased(ch))
final_sigma.after = 0;
} else
final_sigma.after--;
ctx_l.before_dot = before_dot_cnt > 0;
ctx_l.more_above = more_above_cnt > 0;
ctx_l.final_sigma = final_sigma.before && final_sigma.after == 0;
if (state == BETWEEN && uprop_is_cased(ch))
state = LOWER;
struct rview rv = state == LOWER && !nl_IJ ? uprop_get_lc(ch, ctx_l)
: uprop_get_tc(ch, ctx_t);
if (nl_IJ)
nl_IJ = false;
if (state == TITLE && uprop_is_cased(ch)) {
state = BETWEEN;
if (flags & CF_LANG_NL) {
rune next = 0;
if (sv.len > 0)
u8tor(&next, sv.p);
nl_IJ = (ch == 'i' || ch == 'I')
&& (next == 'j' || next == 'J');
}
}
for (size_t i = 0; i < rv.len; i++)
n += rtou8(dst + n, bufsz - n, rv.p[i]);
ctx_l.after_I = (ch == 'I')
|| (ctx_l.after_I && !uprop_ccc_0_or_230(ch));
if (uprop_is_cased(ch))
final_sigma.before = true;
else if (!uprop_is_ci(ch))
final_sigma.before = false;
if (uprop_is_sd(ch))
ctx_t.after_soft_dotted = true;
else if (uprop_ccc_0_or_230(ch))
ctx_t.after_soft_dotted = false;
}
*dstn = n;
return alloc(alloc_ctx, dst, bufsz, n, 1, alignof(char8_t));
}
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