lib/perl5/5.8.8/msys/CORE/utf8.h

   1 /*    utf8.h
   2  *
   3  *    Copyright (C) 2000, 2001, 2002, 2005 by Larry Wall and others
   4  *
   5  *    You may distribute under the terms of either the GNU General Public
   6  *    License or the Artistic License, as specified in the README file.
   7  *
   8  */
   9
  10 /* Use UTF-8 as the default script encoding?
  11  * Turning this on will break scripts having non-UTF-8 binary
  12  * data (such as Latin-1) in string literals. */
  13 #ifdef USE_UTF8_SCRIPTS
  14 #    define USE_UTF8_IN_NAMES (!IN_BYTES)
  15 #else
  16 #    define USE_UTF8_IN_NAMES (PL_hints & HINT_UTF8)
  17 #endif
  18
  19 #ifdef EBCDIC
  20 /* The equivalent of these macros but implementing UTF-EBCDIC
  21    are in the following header file:
  22  */
  23
  24 #include "utfebcdic.h"
  25 #else
  26 START_EXTERN_C
  27
  28 #ifdef DOINIT
  29 EXTCONST unsigned char PL_utf8skip[] = {
  30 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
  31 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
  32 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
  33 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
  34 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus */
  35 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus */
  36 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* scripts */
  37 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,     /* cjk etc. */
  38 7,13, /* Perl extended (not UTF-8).  Up to 72bit allowed (64-bit + reserved). */
  39 };
  40 #else
  41 EXTCONST unsigned char PL_utf8skip[];
  42 #endif
  43
  44 END_EXTERN_C
  45 #define UTF8SKIP(s) PL_utf8skip[*(const U8*)s]
  46
  47 /* Native character to iso-8859-1 */
  48 #define NATIVE_TO_ASCII(ch)      (ch)
  49 #define ASCII_TO_NATIVE(ch)      (ch)
  50 /* Transform after encoding */
  51 #define NATIVE_TO_UTF(ch)        (ch)
  52 #define UTF_TO_NATIVE(ch)        (ch)
  53 /* Transforms in wide UV chars */
  54 #define UNI_TO_NATIVE(ch)        (ch)
  55 #define NATIVE_TO_UNI(ch)        (ch)
  56 /* Transforms in invariant space */
  57 #define NATIVE_TO_NEED(enc,ch)   (ch)
  58 #define ASCII_TO_NEED(enc,ch)    (ch)
  59
  60 /* As there are no translations avoid the function wrapper */
  61 #define Perl_utf8n_to_uvchr Perl_utf8n_to_uvuni
  62 #define Perl_uvchr_to_utf8  Perl_uvuni_to_utf8
  63
  64 /*
  65
  66  The following table is from Unicode 3.2.
  67
  68  Code Points            1st Byte  2nd Byte  3rd Byte  4th Byte
  69
  70    U+0000..U+007F       00..7F
  71    U+0080..U+07FF       C2..DF    80..BF
  72    U+0800..U+0FFF       E0        A0..BF    80..BF
  73    U+1000..U+CFFF       E1..EC    80..BF    80..BF
  74    U+D000..U+D7FF       ED        80..9F    80..BF
  75    U+D800..U+DFFF       ******* ill-formed *******
  76    U+E000..U+FFFF       EE..EF    80..BF    80..BF
  77   U+10000..U+3FFFF      F0        90..BF    80..BF    80..BF
  78   U+40000..U+FFFFF      F1..F3    80..BF    80..BF    80..BF
  79  U+100000..U+10FFFF     F4        80..8F    80..BF    80..BF
  80
  81 Note the A0..BF in U+0800..U+0FFF, the 80..9F in U+D000...U+D7FF,
  82 the 90..BF in U+10000..U+3FFFF, and the 80...8F in U+100000..U+10FFFF.
  83 The "gaps" are caused by legal UTF-8 avoiding non-shortest encodings:
  84 it is technically possible to UTF-8-encode a single code point in different
  85 ways, but that is explicitly forbidden, and the shortest possible encoding
  86 should always be used (and that is what Perl does).
  87
  88  */
  89
  90 /*
  91  Another way to look at it, as bits:
  92
  93  Code Points                    1st Byte   2nd Byte  3rd Byte  4th Byte
  94
  95                     0aaaaaaa     0aaaaaaa
  96             00000bbbbbaaaaaa     110bbbbb  10aaaaaa
  97             ccccbbbbbbaaaaaa     1110cccc  10bbbbbb  10aaaaaa
  98   00000dddccccccbbbbbbaaaaaa     11110ddd  10cccccc  10bbbbbb  10aaaaaa
  99
 100 As you can see, the continuation bytes all begin with C<10>, and the
 101 leading bits of the start byte tell how many bytes the are in the
 102 encoded character.
 103
 104 */
 105
 106
 107 #define UNI_IS_INVARIANT(c)             (((UV)c) <  0x80)
 108 #define UTF8_IS_INVARIANT(c)            UNI_IS_INVARIANT(NATIVE_TO_UTF(c))
 109 #define NATIVE_IS_INVARIANT(c)          UNI_IS_INVARIANT(NATIVE_TO_ASCII(c))
 110 #define UTF8_IS_START(c)                (((U8)c) >= 0xc0 && (((U8)c) <= 0xfd))
 111 #define UTF8_IS_CONTINUATION(c)         (((U8)c) >= 0x80 && (((U8)c) <= 0xbf))
 112 #define UTF8_IS_CONTINUED(c)            (((U8)c) &  0x80)
 113 #define UTF8_IS_DOWNGRADEABLE_START(c)  (((U8)c & 0xfc) == 0xc0)
 114
 115 #define UTF_START_MARK(len) ((len >  7) ? 0xFF : (0xFE << (7-len)))
 116 #define UTF_START_MASK(len) ((len >= 7) ? 0x00 : (0x1F >> (len-2)))
 117
 118 #define UTF_CONTINUATION_MARK           0x80
 119 #define UTF_ACCUMULATION_SHIFT          6
 120 #define UTF_CONTINUATION_MASK           ((U8)0x3f)
 121 #define UTF8_ACCUMULATE(old, new)       (((old) << UTF_ACCUMULATION_SHIFT) | (((U8)new) & UTF_CONTINUATION_MASK))
 122
 123 #define UTF8_EIGHT_BIT_HI(c)    ((((U8)(c))>>UTF_ACCUMULATION_SHIFT)|UTF_START_MARK(2))
 124 #define UTF8_EIGHT_BIT_LO(c)    (((((U8)(c)))&UTF_CONTINUATION_MASK)|UTF_CONTINUATION_MARK)
 125
 126 #ifdef HAS_QUAD
 127 #define UNISKIP(uv) ( (uv) < 0x80           ? 1 : \
 128                       (uv) < 0x800          ? 2 : \
 129                       (uv) < 0x10000        ? 3 : \
 130                       (uv) < 0x200000       ? 4 : \
 131                       (uv) < 0x4000000      ? 5 : \
 132                       (uv) < 0x80000000     ? 6 : \
 133                       (uv) < UTF8_QUAD_MAX ? 7 : 13 )
 134 #else
 135 /* No, I'm not even going to *TRY* putting #ifdef inside a #define */
 136 #define UNISKIP(uv) ( (uv) < 0x80           ? 1 : \
 137                       (uv) < 0x800          ? 2 : \
 138                       (uv) < 0x10000        ? 3 : \
 139                       (uv) < 0x200000       ? 4 : \
 140                       (uv) < 0x4000000      ? 5 : \
 141                       (uv) < 0x80000000     ? 6 : 7 )
 142 #endif
 143
 144 /*
 145  * Note: we try to be careful never to call the isXXX_utf8() functions
 146  * unless we're pretty sure we've seen the beginning of a UTF-8 character
 147  * (that is, the two high bits are set).  Otherwise we risk loading in the
 148  * heavy-duty SWASHINIT and SWASHGET routines unnecessarily.
 149  */
 150 #define isIDFIRST_lazy_if(p,c) ((IN_BYTES || (!c || (*((const U8*)p) < 0xc0))) \
 151                                 ? isIDFIRST(*(p)) \
 152                                 : isIDFIRST_utf8((U8*)p))
 153 #define isALNUM_lazy_if(p,c)   ((IN_BYTES || (!c || (*((const U8*)p) < 0xc0))) \
 154                                 ? isALNUM(*(p)) \
 155                                 : isALNUM_utf8((U8*)p))
 156
 157
 158 #endif /* EBCDIC vs ASCII */
 159
 160 /* Rest of these are attributes of Unicode and perl's internals rather than the encoding */
 161
 162 #define isIDFIRST_lazy(p)       isIDFIRST_lazy_if(p,1)
 163 #define isALNUM_lazy(p)         isALNUM_lazy_if(p,1)
 164
 165 #define UTF8_MAXBYTES 13
 166 /* How wide can a single UTF-8 encoded character become in bytes.
 167  * NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8
 168  * since UTF-8 is an encoding of Unicode and given Unicode's current
 169  * upper limit only four bytes is possible.  Perl thinks of UTF-8
 170  * as a way to encode non-negative integers in a binary format. */
 171 #define UTF8_MAXLEN UTF8_MAXBYTES
 172
 173 #define UTF8_MAXLEN_UCLC 3              /* Obsolete, do not use. */
 174 #define UTF8_MAXLEN_UCLC_MULT 39        /* Obsolete, do not use. */
 175 #define UTF8_MAXLEN_FOLD 3              /* Obsolete, do not use. */
 176 #define UTF8_MAXLEN_FOLD_MULT 39        /* Obsolete, do not use. */
 177
 178 /* The maximum number of UTF-8 bytes a single Unicode character can
 179  * uppercase/lowercase/fold into; this number depends on the Unicode
 180  * version.  An example of maximal expansion is the U+03B0 which
 181  * uppercases to U+03C5 U+0308 U+0301.  The Unicode databases that
 182  * tell these things are UnicodeDatabase.txt, CaseFolding.txt, and
 183  * SpecialCasing.txt. */
 184 #define UTF8_MAXBYTES_CASE      6
 185
 186 #define IN_BYTES (PL_curcop->op_private & HINT_BYTES)
 187 #define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
 188
 189 #define UTF8_ALLOW_EMPTY                0x0001
 190 #define UTF8_ALLOW_CONTINUATION         0x0002
 191 #define UTF8_ALLOW_NON_CONTINUATION     0x0004
 192 #define UTF8_ALLOW_FE_FF                0x0008
 193 #define UTF8_ALLOW_SHORT                0x0010
 194 #define UTF8_ALLOW_SURROGATE            0x0020
 195 #define UTF8_ALLOW_FFFF                 0x0040 /* Allows also FFFE. */
 196 #define UTF8_ALLOW_LONG                 0x0080
 197 #define UTF8_ALLOW_ANYUV                (UTF8_ALLOW_EMPTY|UTF8_ALLOW_FE_FF|\
 198                                          UTF8_ALLOW_SURROGATE|UTF8_ALLOW_FFFF)
 199 #define UTF8_ALLOW_ANY                  0x00FF
 200 #define UTF8_CHECK_ONLY                 0x0200
 201
 202 #define UNICODE_SURROGATE_FIRST         0xD800
 203 #define UNICODE_SURROGATE_LAST          0xDFFF
 204 #define UNICODE_REPLACEMENT             0xFFFD
 205 #define UNICODE_BYTE_ORDER_MARK         0xFEFF
 206 #define UNICODE_ILLEGAL                 0xFFFF
 207
 208 /* Though our UTF-8 encoding can go beyond this,
 209  * let's be conservative and do as Unicode 3.2 says. */
 210 #define PERL_UNICODE_MAX        0x10FFFF
 211
 212 #define UNICODE_ALLOW_SURROGATE 0x0001  /* Allow UTF-16 surrogates (EVIL) */
 213 #define UNICODE_ALLOW_FDD0      0x0002  /* Allow the U+FDD0...U+FDEF */
 214 #define UNICODE_ALLOW_FFFF      0x0004  /* Allow 0xFFF[EF], 0x1FFF[EF], ... */
 215 #define UNICODE_ALLOW_SUPER     0x0008  /* Allow past 10xFFFF */
 216 #define UNICODE_ALLOW_ANY       0x000F
 217
 218 #define UNICODE_IS_SURROGATE(c)         ((c) >= UNICODE_SURROGATE_FIRST && \
 219                                          (c) <= UNICODE_SURROGATE_LAST)
 220 #define UNICODE_IS_REPLACEMENT(c)       ((c) == UNICODE_REPLACEMENT)
 221 #define UNICODE_IS_BYTE_ORDER_MARK(c)   ((c) == UNICODE_BYTE_ORDER_MARK)
 222 #define UNICODE_IS_ILLEGAL(c)           ((c) == UNICODE_ILLEGAL)
 223
 224 #ifdef HAS_QUAD
 225 #    define UTF8_QUAD_MAX       UINT64_C(0x1000000000)
 226 #endif
 227
 228 #define UTF8_IS_ASCII(c) UTF8_IS_INVARIANT(c)
 229
 230 #define UNICODE_LATIN_SMALL_LETTER_SHARP_S      0x00DF
 231 #define UNICODE_GREEK_CAPITAL_LETTER_SIGMA      0x03A3
 232 #define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA  0x03C2
 233 #define UNICODE_GREEK_SMALL_LETTER_SIGMA        0x03C3
 234
 235 #define EBCDIC_LATIN_SMALL_LETTER_SHARP_S       0x0059
 236
 237 #define UNI_DISPLAY_ISPRINT     0x0001
 238 #define UNI_DISPLAY_BACKSLASH   0x0002
 239 #define UNI_DISPLAY_QQ          (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
 240 #define UNI_DISPLAY_REGEX       (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
 241
 242 #ifdef EBCDIC
 243 #   define ANYOF_FOLD_SHARP_S(node, input, end) \
 244         (ANYOF_BITMAP_TEST(node, EBCDIC_LATIN_SMALL_LETTER_SHARP_S) && \
 245          (ANYOF_FLAGS(node) & ANYOF_UNICODE) && \
 246          (ANYOF_FLAGS(node) & ANYOF_FOLD) && \
 247          ((end) > (input) + 1) && \
 248          toLOWER((input)[0]) == 's' && \
 249          toLOWER((input)[1]) == 's')
 250 #else
 251 #   define ANYOF_FOLD_SHARP_S(node, input, end) \
 252         (ANYOF_BITMAP_TEST(node, UNICODE_LATIN_SMALL_LETTER_SHARP_S) && \
 253          (ANYOF_FLAGS(node) & ANYOF_UNICODE) && \
 254          (ANYOF_FLAGS(node) & ANYOF_FOLD) && \
 255          ((end) > (input) + 1) && \
 256          toLOWER((input)[0]) == 's' && \
 257          toLOWER((input)[1]) == 's')
 258 #endif
 259 #define SHARP_S_SKIP 2
 260
 261 #ifdef EBCDIC
 262 /* IS_UTF8_CHAR() is not ported to EBCDIC */
 263 #else
 264 #define IS_UTF8_CHAR_1(p)       \
 265         ((p)[0] <= 0x7F)
 266 #define IS_UTF8_CHAR_2(p)       \
 267         ((p)[0] >= 0xC2 && (p)[0] <= 0xDF && \
 268          (p)[1] >= 0x80 && (p)[1] <= 0xBF)
 269 #define IS_UTF8_CHAR_3a(p)      \
 270         ((p)[0] == 0xE0 && \
 271          (p)[1] >= 0xA0 && (p)[1] <= 0xBF && \
 272          (p)[2] >= 0x80 && (p)[2] <= 0xBF)
 273 #define IS_UTF8_CHAR_3b(p)      \
 274         ((p)[0] >= 0xE1 && (p)[0] <= 0xEC && \
 275          (p)[1] >= 0x80 && (p)[1] <= 0xBF && \
 276          (p)[2] >= 0x80 && (p)[2] <= 0xBF)
 277 #define IS_UTF8_CHAR_3c(p)      \
 278         ((p)[0] == 0xED && \
 279          (p)[1] >= 0x80 && (p)[1] <= 0xBF && \
 280          (p)[2] >= 0x80 && (p)[2] <= 0xBF)
 281 /* In IS_UTF8_CHAR_3c(p) one could use
 282  * (p)[1] >= 0x80 && (p)[1] <= 0x9F
 283  * if one wanted to exclude surrogates. */
 284 #define IS_UTF8_CHAR_3d(p)      \
 285         ((p)[0] >= 0xEE && (p)[0] <= 0xEF && \
 286          (p)[1] >= 0x80 && (p)[1] <= 0xBF && \
 287          (p)[2] >= 0x80 && (p)[2] <= 0xBF)
 288 #define IS_UTF8_CHAR_4a(p)      \
 289         ((p)[0] == 0xF0 && \
 290          (p)[1] >= 0x90 && (p)[1] <= 0xBF && \
 291          (p)[2] >= 0x80 && (p)[2] <= 0xBF && \
 292          (p)[3] >= 0x80 && (p)[3] <= 0xBF)
 293 #define IS_UTF8_CHAR_4b(p)      \
 294         ((p)[0] >= 0xF1 && (p)[0] <= 0xF3 && \
 295          (p)[1] >= 0x80 && (p)[1] <= 0xBF && \
 296          (p)[2] >= 0x80 && (p)[2] <= 0xBF && \
 297          (p)[3] >= 0x80 && (p)[3] <= 0xBF)
 298 /* In IS_UTF8_CHAR_4c(p) one could use
 299  * (p)[0] == 0xF4
 300  * if one wanted to stop at the Unicode limit U+10FFFF.
 301  * The 0xF7 allows us to go to 0x1fffff (0x200000 would
 302  * require five bytes).  Not doing any further code points
 303  * since that is not needed (and that would not be strict
 304  * UTF-8, anyway).  The "slow path" in Perl_is_utf8_char()
 305  * will take care of the "extended UTF-8". */
 306 #define IS_UTF8_CHAR_4c(p)      \
 307         ((p)[0] == 0xF4 && (p)[0] <= 0xF7 && \
 308          (p)[1] >= 0x80 && (p)[1] <= 0xBF && \
 309          (p)[2] >= 0x80 && (p)[2] <= 0xBF && \
 310          (p)[3] >= 0x80 && (p)[3] <= 0xBF)
 311
 312 #define IS_UTF8_CHAR_3(p)       \
 313         (IS_UTF8_CHAR_3a(p) || \
 314          IS_UTF8_CHAR_3b(p) || \
 315          IS_UTF8_CHAR_3c(p) || \
 316          IS_UTF8_CHAR_3d(p))
 317 #define IS_UTF8_CHAR_4(p)       \
 318         (IS_UTF8_CHAR_4a(p) || \
 319          IS_UTF8_CHAR_4b(p) || \
 320          IS_UTF8_CHAR_4c(p))
 321
 322 /* IS_UTF8_CHAR(p) is strictly speaking wrong (not UTF-8) because it
 323  * (1) allows UTF-8 encoded UTF-16 surrogates
 324  * (2) it allows code points past U+10FFFF.
 325  * The Perl_is_utf8_char() full "slow" code will handle the Perl
 326  * "extended UTF-8". */
 327 #define IS_UTF8_CHAR(p, n)      \
 328         ((n) == 1 ? IS_UTF8_CHAR_1(p) : \
 329          (n) == 2 ? IS_UTF8_CHAR_2(p) : \
 330          (n) == 3 ? IS_UTF8_CHAR_3(p) : \
 331          (n) == 4 ? IS_UTF8_CHAR_4(p) : 0)
 332
 333 #define IS_UTF8_CHAR_FAST(n) ((n) <= 4)
 334
 335 #endif /* IS_UTF8_CHAR() for UTF-8 */