145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
#include "nuklear.h"
|
|
#include "nuklear_internal.h"
|
|
|
|
/* ===============================================================
|
|
*
|
|
* UTF-8
|
|
*
|
|
* ===============================================================*/
|
|
NK_GLOBAL const nk_byte nk_utfbyte[NK_UTF_SIZE+1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
|
|
NK_GLOBAL const nk_byte nk_utfmask[NK_UTF_SIZE+1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
|
|
NK_GLOBAL const nk_uint nk_utfmin[NK_UTF_SIZE+1] = {0, 0, 0x80, 0x800, 0x10000};
|
|
NK_GLOBAL const nk_uint nk_utfmax[NK_UTF_SIZE+1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
|
|
|
|
NK_INTERN int
|
|
nk_utf_validate(nk_rune *u, int i)
|
|
{
|
|
NK_ASSERT(u);
|
|
if (!u) return 0;
|
|
if (!NK_BETWEEN(*u, nk_utfmin[i], nk_utfmax[i]) ||
|
|
NK_BETWEEN(*u, 0xD800, 0xDFFF))
|
|
*u = NK_UTF_INVALID;
|
|
for (i = 1; *u > nk_utfmax[i]; ++i);
|
|
return i;
|
|
}
|
|
NK_INTERN nk_rune
|
|
nk_utf_decode_byte(char c, int *i)
|
|
{
|
|
NK_ASSERT(i);
|
|
if (!i) return 0;
|
|
for(*i = 0; *i < (int)NK_LEN(nk_utfmask); ++(*i)) {
|
|
if (((nk_byte)c & nk_utfmask[*i]) == nk_utfbyte[*i])
|
|
return (nk_byte)(c & ~nk_utfmask[*i]);
|
|
}
|
|
return 0;
|
|
}
|
|
NK_API int
|
|
nk_utf_decode(const char *c, nk_rune *u, int clen)
|
|
{
|
|
int i, j, len, type=0;
|
|
nk_rune udecoded;
|
|
|
|
NK_ASSERT(c);
|
|
NK_ASSERT(u);
|
|
|
|
if (!c || !u) return 0;
|
|
if (!clen) return 0;
|
|
*u = NK_UTF_INVALID;
|
|
|
|
udecoded = nk_utf_decode_byte(c[0], &len);
|
|
if (!NK_BETWEEN(len, 1, NK_UTF_SIZE))
|
|
return 1;
|
|
|
|
for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
|
|
udecoded = (udecoded << 6) | nk_utf_decode_byte(c[i], &type);
|
|
if (type != 0)
|
|
return j;
|
|
}
|
|
if (j < len)
|
|
return 0;
|
|
*u = udecoded;
|
|
nk_utf_validate(u, len);
|
|
return len;
|
|
}
|
|
NK_INTERN char
|
|
nk_utf_encode_byte(nk_rune u, int i)
|
|
{
|
|
return (char)((nk_utfbyte[i]) | ((nk_byte)u & ~nk_utfmask[i]));
|
|
}
|
|
NK_API int
|
|
nk_utf_encode(nk_rune u, char *c, int clen)
|
|
{
|
|
int len, i;
|
|
len = nk_utf_validate(&u, 0);
|
|
if (clen < len || !len || len > NK_UTF_SIZE)
|
|
return 0;
|
|
|
|
for (i = len - 1; i != 0; --i) {
|
|
c[i] = nk_utf_encode_byte(u, 0);
|
|
u >>= 6;
|
|
}
|
|
c[0] = nk_utf_encode_byte(u, len);
|
|
return len;
|
|
}
|
|
NK_API int
|
|
nk_utf_len(const char *str, int len)
|
|
{
|
|
const char *text;
|
|
int glyphs = 0;
|
|
int text_len;
|
|
int glyph_len;
|
|
int src_len = 0;
|
|
nk_rune unicode;
|
|
|
|
NK_ASSERT(str);
|
|
if (!str || !len) return 0;
|
|
|
|
text = str;
|
|
text_len = len;
|
|
glyph_len = nk_utf_decode(text, &unicode, text_len);
|
|
while (glyph_len && src_len < len) {
|
|
glyphs++;
|
|
src_len = src_len + glyph_len;
|
|
glyph_len = nk_utf_decode(text + src_len, &unicode, text_len - src_len);
|
|
}
|
|
return glyphs;
|
|
}
|
|
NK_API const char*
|
|
nk_utf_at(const char *buffer, int length, int index,
|
|
nk_rune *unicode, int *len)
|
|
{
|
|
int i = 0;
|
|
int src_len = 0;
|
|
int glyph_len = 0;
|
|
const char *text;
|
|
int text_len;
|
|
|
|
NK_ASSERT(buffer);
|
|
NK_ASSERT(unicode);
|
|
NK_ASSERT(len);
|
|
|
|
if (!buffer || !unicode || !len) return 0;
|
|
if (index < 0) {
|
|
*unicode = NK_UTF_INVALID;
|
|
*len = 0;
|
|
return 0;
|
|
}
|
|
|
|
text = buffer;
|
|
text_len = length;
|
|
glyph_len = nk_utf_decode(text, unicode, text_len);
|
|
while (glyph_len) {
|
|
if (i == index) {
|
|
*len = glyph_len;
|
|
break;
|
|
}
|
|
|
|
i++;
|
|
src_len = src_len + glyph_len;
|
|
glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
|
|
}
|
|
if (i != index) return 0;
|
|
return buffer + src_len;
|
|
}
|
|
|