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#include <ctype.h>
#define i_header
#include <stc/cstr.h>
#include "utf8tabs.inc"
// https://news.ycombinator.com/item?id=15423674
// https://gist.github.com/s4y/344a355f8c1f99c6a4cb2347ec4323cc
void utf8_decode(utf8_decode_t *d, const uint8_t b)
{
switch (d->state) {
case UTF8_OK:
if (b < 0x80) d->codep = b, d->size = 1;
else if (b < 0xC2) d->state = UTF8_ERROR, d->size = 0;
else if (b < 0xE0) d->state = 1, d->codep = b & 0x1F, d->size = 2;
else if (b < 0xF0) d->state = 2, d->codep = b & 0x0F, d->size = 3;
else if (b < 0xF5) d->state = 3, d->codep = b & 0x07, d->size = 4;
else d->state = UTF8_ERROR, d->size = 0;
break;
case 1: case 2: case 3:
if ((b & 0xC0) == 0x80) {
d->state -= 1;
d->codep = (d->codep << 6) | (b & 0x3F);
} else
d->state = UTF8_ERROR, d->size = 0;
}
}
unsigned utf8_encode(char *out, uint32_t c)
{
if (c < 0x80U) {
out[0] = (char) c;
return 1;
} else if (c < 0x0800U) {
out[0] = (char) ((c>>6 & 0x1F) | 0xC0);
out[1] = (char) ((c & 0x3F) | 0x80);
return 2;
} else if (c < 0x010000U) {
if ((c < 0xD800U) | (c >= 0xE000U)) {
out[0] = (char) ((c>>12 & 0x0F) | 0xE0);
out[1] = (char) ((c>>6 & 0x3F) | 0x80);
out[2] = (char) ((c & 0x3F) | 0x80);
return 3;
}
} else if (c < 0x110000U) {
out[0] = (char) ((c>>18 & 0x07) | 0xF0);
out[1] = (char) ((c>>12 & 0x3F) | 0x80);
out[2] = (char) ((c>>6 & 0x3F) | 0x80);
out[3] = (char) ((c & 0x3F) | 0x80);
return 4;
}
return 0;
}
void utf8_peek(utf8_decode_t* d, const char *s) {
utf8_decode(d, (uint8_t)*s++);
switch (d->size) {
case 4: utf8_decode(d, (uint8_t)*s++);
case 3: utf8_decode(d, (uint8_t)*s++);
case 2: utf8_decode(d, (uint8_t)*s++);
}
}
bool utf8_valid(const char* s) {
utf8_decode_t d = {UTF8_OK};
while (*s)
utf8_decode(&d, (uint8_t)*s++);
return d.state == UTF8_OK;
}
bool utf8_valid_n(const char* s, size_t n) {
utf8_decode_t d = {UTF8_OK};
while ((n-- != 0) & (*s != 0))
utf8_decode(&d, (uint8_t)*s++);
return d.state == UTF8_OK;
}
uint32_t utf8_tolower(uint32_t c) {
for (size_t i=0; i < sizeof casefold/sizeof *casefold; ++i) {
if (c <= casefold[i].c1) {
if (c < casefold[i].c0) return c;
int d = casefold[i].m1 - casefold[i].c1;
if (d == 1) return c + ((casefold[i].c1 & 1) == (c & 1));
return c + d;
}
}
return c;
}
uint32_t utf8_toupper(uint32_t c) {
for (size_t i=0; i < sizeof cfold_low/sizeof *cfold_low; ++i) {
struct CaseFold cfold = casefold[cfold_low[i]];
if (c <= cfold.m1) {
int d = cfold.m1 - cfold.c1;
if (c < (uint32_t)(cfold.c0 + d)) return c;
if (d == 1) return c - ((cfold.m1 & 1) == (c & 1));
return c - d;
}
}
return c;
}
bool utf8_isupper(uint32_t c) {
return utf8_tolower(c) != c;
}
bool utf8_islower(uint32_t c) {
return utf8_toupper(c) != c;
}
bool utf8_isspace(uint32_t c) {
static uint16_t t[] = {0x20, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x85, 0xA0,
0x1680, 0x2028, 0x2029, 0x202F, 0x205F, 0x3000};
for (size_t i=0; i<sizeof t/sizeof *t; ++i)
if (c == t[i]) return true;
return (c >= 0x2000) & (c <= 0x200A);
}
bool utf8_isdigit(uint32_t c) {
return ((c >= '0') & (c <= '9')) ||
((c >= 0xFF10) & (c <= 0xFF19));
}
bool utf8_isxdigit(uint32_t c) {
static uint16_t t[] = {0x30, 0x39, 0x41, 0x46, 0x61, 0x66, 0xFF10,
0xFF19, 0xFF21, 0xFF26, 0xFF41, 0xFF46};
for (size_t i=1; i<sizeof t/sizeof *t; i += 2)
if (c <= t[i]) return c >= t[i - 1];
return false;
}
bool utf8_isalnum(uint32_t c) {
if (c < 128) return isalnum(c) != 0;
if ((c >= 0xFF10) & (c <= 0xFF19)) return true;
return utf8_islower(c) || utf8_isupper(c);
}
bool utf8_isalpha(uint32_t c) {
if (c < 128) return isalpha(c) != 0;
return utf8_islower(c) || utf8_isupper(c);
}
static struct fnfold {
int (*conv_asc)(int);
uint32_t (*conv_u8)(uint32_t);
}
fn_tolower = {tolower, utf8_tolower},
fn_toupper = {toupper, utf8_toupper};
static cstr cstr_casefold(const cstr* self, struct fnfold fold) {
csview sv = cstr_sv(self);
cstr out = cstr_null;
char *buf = cstr_reserve(&out, sv.size*3/2);
uint32_t cp; size_t sz = 0;
utf8_decode_t d = {UTF8_OK};
for (; *sv.str; sv.str += d.size) {
utf8_peek(&d, sv.str);
switch (d.size) {
case 1:
buf[sz++] = (char)fold.conv_asc(*sv.str);
break;
default:
cp = fold.conv_u8(d.codep);
sz += utf8_encode(buf + sz, cp);
}
}
_cstr_set_size(&out, sz);
cstr_shrink_to_fit(&out);
return out;
}
cstr cstr_tolower(const cstr* self) {
return cstr_casefold(self, fn_tolower);
}
cstr cstr_toupper(const cstr* self) {
return cstr_casefold(self, fn_toupper);
}
void cstr_lowercase(cstr* self) {
cstr_take(self, cstr_casefold(self, fn_tolower));
}
void cstr_uppercase(cstr* self) {
cstr_take(self, cstr_casefold(self, fn_toupper));
}
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