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#include "mbstring.h"
#include "unicode/prop.h"
#include "unicode/string.h"
constexpr rune COMB_GRAVE = 0x0300;
constexpr rune COMB_ACUTE = 0x0301;
constexpr rune COMB_TILDE = 0x0303;
constexpr rune COMB_DOT_ABOVE = 0x0307;
size_t
u8lower(char8_t *restrict dst, size_t dstn, const char8_t *src, size_t srcn,
enum caseflags flags)
{
struct lcctx ctx = {
.az_or_tr = flags & CF_LANG_AZ,
.lt = flags & CF_LANG_LT,
};
rune ch;
size_t n = 0;
struct u8view word = {}, cpy = {src, srcn};
while (u8next(&ch, &src, &srcn)) {
rune next = 0;
if (srcn > 0)
u8tor(&next, src);
if (src > word.p + word.len)
u8wnext(&word, U8_ARGSP(cpy));
ctx.eow = src == word.p + word.len;
ctx.before_dot = next == COMB_DOT_ABOVE;
ctx.before_acc = next == COMB_GRAVE
|| next == COMB_ACUTE
|| next == COMB_TILDE;
struct rview rv = uprop_get_lc(ch, ctx);
for (size_t i = 0; i < rv.len; i++) {
if (n >= dstn) {
char8_t buf[U8_LEN_MAX];
n += rtou8(buf, sizeof(buf), rv.p[i]);
} else
n += rtou8(dst + n, dstn - n, rv.p[i]);
}
ctx.after_I = ch == 'I';
}
return n;
}
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