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