#include "unicode.hh" #include "misc.hh" using namespace lout::misc; namespace lout { namespace unicode { static unsigned char alpha[0x500] = { // 0000-007F: C0 Controls and Basic Latin 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xff, 0xff, 0x07, 0xfe, 0xff, 0xff, 0x07, // 0080-00FF: C1 Controls and Latin-1 Supplement 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0x7f, 0xff, // 0100-017F: Latin Extended-A 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // 0180-024F: Latin Extended-B 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // 0250–02AF: IPA Extensions 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // 02B0–02FF: Spacing Modifier Letters 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0300–036F: Combining Diacritical Marks 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0370–03FF: Greek and Coptic 0xcf, 0x00, 0x40, 0x7d, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // 0400–04FF: Cyrillic 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x03, 0xfc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; /** * Returns whether a given unicode character is an alphabetic character. */ bool isAlpha (int ch) { return ch < 0x500 && (alpha[ch / 8] & (1 << (ch & 7))); } int decodeUtf8 (const char *s) { if((s[0] & 0x80) == 0) return s[0]; else if((s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80) return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); else if((s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80) return ((s[0] & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); else if((s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80) return ((s[0] & 0x0f) << 18) | ((s[1] & 0x3f) << 12) | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f); else // Treat as ISO-8859-1 / ISO-8859-15 / Windows-1252 return s[0]; } int decodeUtf8 (const char *s, int len) { if(len >= 1 && (s[0] & 0x80) == 0) return s[0]; else if(len >= 2 && (s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80) return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); else if(len >= 3 && (s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80) return ((s[0] & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); else if(len >= 4 && (s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80) return ((s[0] & 0x0f) << 18) | ((s[1] & 0x3f) << 12) | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f); else // Treat as ISO-8859-1 / ISO-8859-15 / Windows-1252 return s[0]; } const char *nextUtf8Char (const char *s) { const char *r; if (s == NULL || s[0] == 0) r = NULL; else if((s[0] & 0x80) == 0) r = s + 1; else if((s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80) r = s + 2; else if((s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80) r = s + 3; else if((s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80) r = s + 4; else // invalid UTF-8 sequence: treat as one byte. r = s + 1; if (r && r[0] == 0) return NULL; else return r; } const char *nextUtf8Char (const char *s, int len) { const char *r; if (s == NULL || len <= 0) r = NULL; else if(len >= 1 && (s[0] & 0x80) == 0) r = s + 1; else if(len >= 2 && (s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80) r = s + 2; else if(len >= 3 && (s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80) r = s + 3; else if(len >= 4 && (s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80) r = s + 4; else // invalid UTF-8 sequence: treat as one byte. r = s + 1; if (r && r - s >= len) return NULL; else return r; } } // namespace lout } // namespace unicode