mirror of
https://codeberg.org/grunfink/snac2.git
synced 2024-11-27 07:13:36 +00:00
462 lines
10 KiB
C
462 lines
10 KiB
C
/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
|
|
|
|
#ifndef _XS_UNICODE_H
|
|
|
|
#define _XS_UNICODE_H
|
|
|
|
int xs_utf8_enc(char buf[4], unsigned int cpoint);
|
|
int xs_is_utf8_cont_byte(char c);
|
|
unsigned int xs_utf8_dec(const char **str);
|
|
int xs_unicode_width(unsigned int cpoint);
|
|
int xs_is_surrogate(unsigned int cpoint);
|
|
int xs_is_diacritic(unsigned int cpoint);
|
|
unsigned int xs_surrogate_dec(unsigned int p1, unsigned int p2);
|
|
unsigned int xs_surrogate_enc(unsigned int cpoint);
|
|
unsigned int *_xs_unicode_upper_search(unsigned int cpoint);
|
|
unsigned int *_xs_unicode_lower_search(unsigned int cpoint);
|
|
#define xs_unicode_is_upper(cpoint) (!!_xs_unicode_upper_search(cpoint))
|
|
#define xs_unicode_is_lower(cpoint) (!!_xs_unicode_lower_search(cpoint))
|
|
unsigned int xs_unicode_to_upper(unsigned int cpoint);
|
|
unsigned int xs_unicode_to_lower(unsigned int cpoint);
|
|
int xs_unicode_nfd(unsigned int cpoint, unsigned int *base, unsigned int *diac);
|
|
int xs_unicode_nfc(unsigned int base, unsigned int diac, unsigned int *cpoint);
|
|
int xs_unicode_is_alpha(unsigned int cpoint);
|
|
int xs_unicode_is_right_to_left(unsigned int cpoint);
|
|
|
|
#ifdef _XS_H
|
|
xs_str *xs_utf8_insert(xs_str *str, unsigned int cpoint, int *offset);
|
|
xs_str *xs_utf8_cat(xs_str *str, unsigned int cpoint);
|
|
xs_str *xs_utf8_to_upper(const char *str);
|
|
xs_str *xs_utf8_to_lower(const char *str);
|
|
xs_str *xs_utf8_to_nfd(const char *str);
|
|
xs_str *xs_utf8_to_nfc(const char *str);
|
|
#endif
|
|
|
|
#ifdef XS_IMPLEMENTATION
|
|
|
|
#include <ctype.h>
|
|
|
|
#ifndef xs_countof
|
|
#define xs_countof(a) (sizeof((a)) / sizeof((*a)))
|
|
#endif
|
|
|
|
int xs_utf8_enc(char buf[4], unsigned int cpoint)
|
|
/* encodes an Unicode codepoint to utf-8 into buf and returns the size in bytes */
|
|
{
|
|
char *p = buf;
|
|
|
|
if (cpoint < 0x80) /* 1 byte char */
|
|
*p++ = cpoint & 0xff;
|
|
else {
|
|
if (cpoint < 0x800) /* 2 byte char */
|
|
*p++ = 0xc0 | (cpoint >> 6);
|
|
else {
|
|
if (cpoint < 0x10000) /* 3 byte char */
|
|
*p++ = 0xe0 | (cpoint >> 12);
|
|
else { /* 4 byte char */
|
|
*p++ = 0xf0 | (cpoint >> 18);
|
|
*p++ = 0x80 | ((cpoint >> 12) & 0x3f);
|
|
}
|
|
|
|
*p++ = 0x80 | ((cpoint >> 6) & 0x3f);
|
|
}
|
|
|
|
*p++ = 0x80 | (cpoint & 0x3f);
|
|
}
|
|
|
|
return p - buf;
|
|
}
|
|
|
|
|
|
int xs_is_utf8_cont_byte(char c)
|
|
/* returns true if c is an utf8 continuation byte */
|
|
{
|
|
return ((c & 0xc0) == 0x80);
|
|
}
|
|
|
|
|
|
unsigned int xs_utf8_dec(const char **str)
|
|
/* decodes an utf-8 char inside str and updates the pointer */
|
|
{
|
|
const char *p = *str;
|
|
unsigned int cpoint = 0;
|
|
unsigned char c = *p++;
|
|
int cb = 0;
|
|
|
|
if ((c & 0x80) == 0) { /* 1 byte char */
|
|
cpoint = c;
|
|
}
|
|
else
|
|
if ((c & 0xe0) == 0xc0) { /* 2 byte char */
|
|
cpoint = (c & 0x1f) << 6;
|
|
cb = 1;
|
|
}
|
|
else
|
|
if ((c & 0xf0) == 0xe0) { /* 3 byte char */
|
|
cpoint = (c & 0x0f) << 12;
|
|
cb = 2;
|
|
}
|
|
else
|
|
if ((c & 0xf8) == 0xf0) { /* 4 byte char */
|
|
cpoint = (c & 0x07) << 18;
|
|
cb = 3;
|
|
}
|
|
|
|
/* process the continuation bytes */
|
|
while (cb > 0 && *p && xs_is_utf8_cont_byte(*p))
|
|
cpoint |= (*p++ & 0x3f) << (--cb * 6);
|
|
|
|
/* incomplete or broken? */
|
|
if (cb)
|
|
cpoint = 0xfffd;
|
|
|
|
*str = p;
|
|
return cpoint;
|
|
}
|
|
|
|
|
|
/** Unicode character width: intentionally dead simple **/
|
|
|
|
static unsigned int xs_unicode_width_table[] = {
|
|
0x300, 0x36f, 0, /* diacritics */
|
|
0x1100, 0x11ff, 2, /* Hangul */
|
|
0x2e80, 0xa4cf, 2, /* CJK */
|
|
0xac00, 0xd7a3, 2, /* more Hangul */
|
|
0xe000, 0xf8ff, 0, /* private use */
|
|
0xf900, 0xfaff, 2, /* CJK compatibility */
|
|
0xff00, 0xff60, 2, /* full width things */
|
|
0xffdf, 0xffe6, 2, /* full width things */
|
|
0x1f200, 0x1ffff, 2, /* emojis */
|
|
0x20000, 0x2fffd, 2 /* more CJK */
|
|
};
|
|
|
|
int xs_unicode_width(unsigned int cpoint)
|
|
/* returns the width in columns of a Unicode codepoint (somewhat simplified) */
|
|
{
|
|
int b = 0;
|
|
int t = xs_countof(xs_unicode_width_table) / 3 - 1;
|
|
|
|
while (t >= b) {
|
|
int n = (b + t) / 2;
|
|
unsigned int *p = &xs_unicode_width_table[n * 3];
|
|
|
|
if (cpoint < p[0])
|
|
t = n - 1;
|
|
else
|
|
if (cpoint > p[1])
|
|
b = n + 1;
|
|
else
|
|
return p[2];
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
int xs_is_diacritic(unsigned int cpoint)
|
|
{
|
|
return cpoint >= 0x300 && cpoint <= 0x36f;
|
|
}
|
|
|
|
|
|
/** surrogate pairs **/
|
|
|
|
int xs_is_surrogate(unsigned int cpoint)
|
|
/* checks if cpoint is the first element of a Unicode surrogate pair */
|
|
{
|
|
return cpoint >= 0xd800 && cpoint <= 0xdfff;
|
|
}
|
|
|
|
|
|
unsigned int xs_surrogate_dec(unsigned int p1, unsigned int p2)
|
|
/* "decodes" a surrogate pair into a codepoint */
|
|
{
|
|
return 0x10000 | ((p1 & 0x3ff) << 10) | (p2 & 0x3ff);
|
|
}
|
|
|
|
|
|
unsigned int xs_surrogate_enc(unsigned int cpoint)
|
|
/* "encodes" a Unicode into a surrogate pair (p1 in the MSB word) */
|
|
{
|
|
unsigned int p1 = 0xd7c0 + (cpoint >> 10);
|
|
unsigned int p2 = 0xdc00 + (cpoint & 0x3ff);
|
|
|
|
return (p1 << 16) | p2;
|
|
}
|
|
|
|
|
|
#ifdef _XS_H
|
|
|
|
xs_str *xs_utf8_insert(xs_str *str, unsigned int cpoint, int *offset)
|
|
/* encodes an Unicode codepoint to utf-8 into str */
|
|
{
|
|
char tmp[4];
|
|
|
|
int c = xs_utf8_enc(tmp, cpoint);
|
|
|
|
str = xs_insert_m(str, *offset, tmp, c);
|
|
|
|
*offset += c;
|
|
|
|
return str;
|
|
}
|
|
|
|
|
|
xs_str *xs_utf8_cat(xs_str *str, unsigned int cpoint)
|
|
/* encodes an Unicode codepoint to utf-8 into str */
|
|
{
|
|
int offset = strlen(str);
|
|
|
|
return xs_utf8_insert(str, cpoint, &offset);
|
|
}
|
|
|
|
#endif /* _XS_H */
|
|
|
|
|
|
#ifdef _XS_UNICODE_TBL_H
|
|
|
|
/* include xs_unicode_tbl.h before this one to use these functions */
|
|
|
|
unsigned int *_xs_unicode_upper_search(unsigned int cpoint)
|
|
/* searches for an uppercase codepoint in the case fold table */
|
|
{
|
|
int b = 0;
|
|
int t = xs_countof(xs_unicode_case_fold_table) / 2 + 1;
|
|
|
|
while (t >= b) {
|
|
int n = (b + t) / 2;
|
|
unsigned int *p = &xs_unicode_case_fold_table[n * 2];
|
|
|
|
if (cpoint < p[0])
|
|
t = n - 1;
|
|
else
|
|
if (cpoint > p[0])
|
|
b = n + 1;
|
|
else
|
|
return p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
unsigned int *_xs_unicode_lower_search(unsigned int cpoint)
|
|
/* searches for a lowercase codepoint in the case fold table */
|
|
{
|
|
unsigned int *p = xs_unicode_case_fold_table;
|
|
unsigned int *e = p + xs_countof(xs_unicode_case_fold_table);
|
|
|
|
while (p < e) {
|
|
if (cpoint == p[1])
|
|
return p;
|
|
|
|
p += 2;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
unsigned int xs_unicode_to_lower(unsigned int cpoint)
|
|
/* returns the cpoint to lowercase */
|
|
{
|
|
if (cpoint < 0x80)
|
|
return tolower(cpoint);
|
|
|
|
unsigned int *p = _xs_unicode_upper_search(cpoint);
|
|
|
|
return p == NULL ? cpoint : p[1];
|
|
}
|
|
|
|
|
|
unsigned int xs_unicode_to_upper(unsigned int cpoint)
|
|
/* returns the cpoint to uppercase */
|
|
{
|
|
if (cpoint < 0x80)
|
|
return toupper(cpoint);
|
|
|
|
unsigned int *p = _xs_unicode_lower_search(cpoint);
|
|
|
|
return p == NULL ? cpoint : p[0];
|
|
}
|
|
|
|
|
|
int xs_unicode_nfd(unsigned int cpoint, unsigned int *base, unsigned int *diac)
|
|
/* applies unicode Normalization Form D */
|
|
{
|
|
int b = 0;
|
|
int t = xs_countof(xs_unicode_nfd_table) / 3 - 1;
|
|
|
|
while (t >= b) {
|
|
int n = (b + t) / 2;
|
|
unsigned int *p = &xs_unicode_nfd_table[n * 3];
|
|
|
|
int c = cpoint - p[0];
|
|
|
|
if (c < 0)
|
|
t = n - 1;
|
|
else
|
|
if (c > 0)
|
|
b = n + 1;
|
|
else {
|
|
*base = p[1];
|
|
*diac = p[2];
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int xs_unicode_nfc(unsigned int base, unsigned int diac, unsigned int *cpoint)
|
|
/* applies unicode Normalization Form C */
|
|
{
|
|
unsigned int *p = xs_unicode_nfd_table;
|
|
unsigned int *e = p + xs_countof(xs_unicode_nfd_table);
|
|
|
|
while (p < e) {
|
|
if (p[1] == base && p[2] == diac) {
|
|
*cpoint = p[0];
|
|
return 1;
|
|
}
|
|
|
|
p += 3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int xs_unicode_is_alpha(unsigned int cpoint)
|
|
/* checks if a codepoint is an alpha (i.e. a letter) */
|
|
{
|
|
int b = 0;
|
|
int t = xs_countof(xs_unicode_alpha_table) / 2 - 1;
|
|
|
|
while (t >= b) {
|
|
int n = (b + t) / 2;
|
|
unsigned int *p = &xs_unicode_alpha_table[n * 2];
|
|
|
|
if (cpoint < p[0])
|
|
t = n - 1;
|
|
else
|
|
if (cpoint > p[1])
|
|
b = n + 1;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int xs_unicode_is_right_to_left(unsigned int cpoint)
|
|
/* checks if a codepoint is a right-to-left letter */
|
|
{
|
|
int b = 0;
|
|
int t = xs_countof(xs_unicode_right_to_left_table) / 2 - 1;
|
|
|
|
while (t >= b) {
|
|
int n = (b + t) / 2;
|
|
unsigned int *p = &xs_unicode_right_to_left_table[n * 2];
|
|
|
|
if (cpoint < p[0])
|
|
t = n - 1;
|
|
else
|
|
if (cpoint > p[1])
|
|
b = n + 1;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef _XS_H
|
|
|
|
xs_str *xs_utf8_to_upper(const char *str)
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
unsigned int cpoint;
|
|
int offset = 0;
|
|
|
|
while ((cpoint = xs_utf8_dec(&str))) {
|
|
cpoint = xs_unicode_to_upper(cpoint);
|
|
s = xs_utf8_insert(s, cpoint, &offset);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
xs_str *xs_utf8_to_lower(const char *str)
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
unsigned int cpoint;
|
|
int offset = 0;
|
|
|
|
while ((cpoint = xs_utf8_dec(&str))) {
|
|
cpoint = xs_unicode_to_lower(cpoint);
|
|
s = xs_utf8_insert(s, cpoint, &offset);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
xs_str *xs_utf8_to_nfd(const char *str)
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
unsigned int cpoint;
|
|
int offset = 0;
|
|
|
|
while ((cpoint = xs_utf8_dec(&str))) {
|
|
unsigned int base;
|
|
unsigned int diac;
|
|
|
|
if (xs_unicode_nfd(cpoint, &base, &diac)) {
|
|
s = xs_utf8_insert(s, base, &offset);
|
|
s = xs_utf8_insert(s, diac, &offset);
|
|
}
|
|
else
|
|
s = xs_utf8_insert(s, cpoint, &offset);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
xs_str *xs_utf8_to_nfc(const char *str)
|
|
{
|
|
xs_str *s = xs_str_new(NULL);
|
|
unsigned int cpoint;
|
|
unsigned int base = 0;
|
|
int offset = 0;
|
|
|
|
while ((cpoint = xs_utf8_dec(&str))) {
|
|
if (xs_is_diacritic(cpoint)) {
|
|
if (xs_unicode_nfc(base, cpoint, &base))
|
|
continue;
|
|
}
|
|
|
|
if (base)
|
|
s = xs_utf8_insert(s, base, &offset);
|
|
|
|
base = cpoint;
|
|
}
|
|
|
|
if (base)
|
|
s = xs_utf8_insert(s, base, &offset);
|
|
|
|
return s;
|
|
}
|
|
|
|
#endif /* _XS_H */
|
|
|
|
#endif /* _XS_UNICODE_TBL_H */
|
|
|
|
#endif /* XS_IMPLEMENTATION */
|
|
|
|
#endif /* _XS_UNICODE_H */
|