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utf8.h: Refactor macro definition
[perl5.git] / utf8.h
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1/* utf8.h
2 *
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3 * This file contains definitions for use with the UTF-8 encoding. It
4 * actually also works with the variant UTF-8 encoding called UTF-EBCDIC, and
5 * hides almost all of the differences between these from the caller. In other
6 * words, someone should #include this file, and if the code is being compiled
7 * on an EBCDIC platform, things should mostly just work.
8 *
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9 * Copyright (C) 2000, 2001, 2002, 2005, 2006, 2007, 2009,
10 * 2010, 2011 by Larry Wall and others
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11 *
12 * You may distribute under the terms of either the GNU General Public
13 * License or the Artistic License, as specified in the README file.
14 *
15 */
16
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17#ifndef H_UTF8 /* Guard against recursive inclusion */
18#define H_UTF8 1
19
39e02b42 20/* Use UTF-8 as the default script encoding?
1e54db1a 21 * Turning this on will break scripts having non-UTF-8 binary
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22 * data (such as Latin-1) in string literals. */
23#ifdef USE_UTF8_SCRIPTS
24# define USE_UTF8_IN_NAMES (!IN_BYTES)
25#else
26# define USE_UTF8_IN_NAMES (PL_hints & HINT_UTF8)
27#endif
28
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29#include "regcharclass.h"
30#include "unicode_constants.h"
31
051a06d4 32/* For to_utf8_fold_flags, q.v. */
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33#define FOLD_FLAGS_LOCALE 0x1
34#define FOLD_FLAGS_FULL 0x2
35#define FOLD_FLAGS_NOMIX_ASCII 0x4
051a06d4 36
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37/* For _core_swash_init(), internal core use only */
38#define _CORE_SWASH_INIT_USER_DEFINED_PROPERTY 0x1
5d3d13d1 39#define _CORE_SWASH_INIT_RETURN_IF_UNDEF 0x2
87367d5f 40#define _CORE_SWASH_INIT_ACCEPT_INVLIST 0x4
83199d38 41
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42/*
43=head1 Unicode Support
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44L<perlguts/Unicode Support> has an introduction to this API.
45
46See also L</Character classification>,
47and L</Character case changing>.
48Various functions outside this section also work specially with Unicode.
49Search for the string "utf8" in this document.
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50
51=for apidoc is_ascii_string
52
53This is a misleadingly-named synonym for L</is_invariant_string>.
54On ASCII-ish platforms, the name isn't misleading: the ASCII-range characters
55are exactly the UTF-8 invariants. But EBCDIC machines have more invariants
56than just the ASCII characters, so C<is_invariant_string> is preferred.
57
58=cut
59*/
60#define is_ascii_string(s, len) is_invariant_string(s, len)
61
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62#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
63#define uvchr_to_utf8_flags(d,uv,flags) \
64 uvoffuni_to_utf8_flags(d,NATIVE_TO_UNI(uv),flags)
65#define utf8_to_uvchr_buf(s, e, lenp) \
842991ae 66 utf8n_to_uvchr(s, (U8*)(e) - (U8*)(s), lenp, \
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67 ckWARN_d(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY)
68
a0270393 69#define to_uni_fold(c, p, lenp) _to_uni_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
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70#define to_utf8_fold(c, p, lenp) _to_utf8_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
71#define to_utf8_lower(a,b,c) _to_utf8_lower_flags(a,b,c,0)
72#define to_utf8_upper(a,b,c) _to_utf8_upper_flags(a,b,c,0)
73#define to_utf8_title(a,b,c) _to_utf8_title_flags(a,b,c,0)
36bb2ab6 74
fd7cb289 75/* Source backward compatibility. */
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76#define is_utf8_string_loc(s, len, ep) is_utf8_string_loclen(s, len, ep, 0)
77
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78#define foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
79 foldEQ_utf8_flags(s1, pe1, l1, u1, s2, pe2, l2, u2, 0)
baa60164 80#define FOLDEQ_UTF8_NOMIX_ASCII (1 << 0)
cea315b6 81#define FOLDEQ_LOCALE (1 << 1)
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82#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
83#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
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84#define FOLDEQ_S1_FOLDS_SANE (1 << 4)
85#define FOLDEQ_S2_FOLDS_SANE (1 << 5)
a33c29bc 86
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87#define ibcmp_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
88 cBOOL(! foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2))
89
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90#ifdef EBCDIC
91/* The equivalent of these macros but implementing UTF-EBCDIC
92 are in the following header file:
93 */
94
95#include "utfebcdic.h"
fd7cb289 96
d06134e5 97#else /* ! EBCDIC */
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98START_EXTERN_C
99
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100/* How wide can a single UTF-8 encoded character become in bytes. */
101/* NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
102 * is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
103 * expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
104 * non-negative integers in a binary format, even those above Unicode */
105#define UTF8_MAXBYTES 13
106
a0ed51b3 107#ifdef DOINIT
6f06b55f 108EXTCONST unsigned char PL_utf8skip[] = {
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109/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
110/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
111/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
112/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
113/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
114/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
115/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
116/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
117/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
118/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
119/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
120/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
121/* 0xC0 */ 2,2, /* overlong */
1ff3baa2 122/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
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123/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
124/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
125/* 0xF0 */ 4,4,4,4,4,4,4,4,5,5,5,5,6,6, /* above BMP to 2**31 - 1 */
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126 /* Perl extended (never was official UTF-8). Up to 36 bit */
127/* 0xFE */ 7,
128 /* More extended, Up to 72 bits (64-bit + reserved) */
111e8ed9 129/* 0xFF */ UTF8_MAXBYTES
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130};
131#else
6f06b55f 132EXTCONST unsigned char PL_utf8skip[];
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133#endif
134
73c4f7a1 135END_EXTERN_C
7e2040f0 136
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137/* Native character to/from iso-8859-1. Are the identity functions on ASCII
138 * platforms */
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139#define NATIVE_TO_LATIN1(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
140#define LATIN1_TO_NATIVE(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
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141
142/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
143 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
144 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
145 * because they are 8-bit encodings that serve the same purpose in Perl, and
146 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
147 * whichever one is applicable on the current platform */
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148#define NATIVE_UTF8_TO_I8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
149#define I8_TO_NATIVE_UTF8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
59a449d5 150
1d72bdf6 151/* Transforms in wide UV chars */
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152#define UNI_TO_NATIVE(ch) ((UV) (ch))
153#define NATIVE_TO_UNI(ch) ((UV) (ch))
d7578b48 154
877d9f0d 155/*
9041c2e3 156
8c007b5a 157 The following table is from Unicode 3.2.
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158
159 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
160
375122d7 161 U+0000..U+007F 00..7F
e1b711da 162 U+0080..U+07FF * C2..DF 80..BF
37e2e78e 163 U+0800..U+0FFF E0 * A0..BF 80..BF
375122d7 164 U+1000..U+CFFF E1..EC 80..BF 80..BF
e1b711da 165 U+D000..U+D7FF ED 80..9F 80..BF
537124e4 166 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
375122d7 167 U+E000..U+FFFF EE..EF 80..BF 80..BF
37e2e78e 168 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
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169 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
170 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
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171 Below are non-Unicode code points
172 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
173 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
537124e4 174 U+200000..: F8.. * 88..BF 80..BF 80..BF 80..BF
877d9f0d 175
e1b711da 176Note the gaps before several of the byte entries above marked by '*'. These are
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177caused by legal UTF-8 avoiding non-shortest encodings: it is technically
178possible to UTF-8-encode a single code point in different ways, but that is
179explicitly forbidden, and the shortest possible encoding should always be used
15824458 180(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 181
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182 */
183
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184/*
185 Another way to look at it, as bits:
186
b2635aa8 187 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 188
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189 0aaa aaaa 0aaa aaaa
190 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
191 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
192 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
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193
194As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 195leading bits of the start byte tell how many bytes there are in the
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196encoded character.
197
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198Perl's extended UTF-8 means we can have start bytes up to FF.
199
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200*/
201
6c88483e 202/* Is the representation of the Unicode code point 'cp' the same regardless of
15824458 203 * being encoded in UTF-8 or not? */
2d1545e5 204#define OFFUNI_IS_INVARIANT(cp) isASCII(cp)
15824458 205
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206/* Is the representation of the code point 'cp' the same regardless of
207 * being encoded in UTF-8 or not? 'cp' is native if < 256; Unicode otherwise
208 * */
cf1be84e 209#define UVCHR_IS_INVARIANT(cp) OFFUNI_IS_INVARIANT(cp)
38953e5a 210
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211/* This defines the bits that are to be in the continuation bytes of a multi-byte
212 * UTF-8 encoded character that mark it is a continuation byte. */
213#define UTF_CONTINUATION_MARK 0x80
214
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215/* Misleadingly named: is the UTF8-encoded byte 'c' part of a variant sequence
216 * in UTF-8? This is the inverse of UTF8_IS_INVARIANT */
c9264833 217#define UTF8_IS_CONTINUED(c) (((U8)c) & UTF_CONTINUATION_MARK)
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218
219/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
220 * This doesn't catch invariants (they are single-byte). It also excludes the
221 * illegal overlong sequences that begin with C0 and C1. */
e4f4ef45 222#define UTF8_IS_START(c) (((U8)c) >= 0xc2)
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223
224/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
225 * first byte thereof? */
c9264833 226#define UTF8_IS_CONTINUATION(c) ((((U8)c) & 0xC0) == UTF_CONTINUATION_MARK)
0ae1fa71 227
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228/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
229 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
230 * be well-formed. Masking with 0xfe allows the low bit to be 0 or 1; thus
231 * this matches 0xc[23]. */
559c7f10 232#define UTF8_IS_DOWNGRADEABLE_START(c) (((U8)(c) & 0xfe) == 0xc2)
4ab10950 233
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234/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
235 * represent a code point > 255? */
e4f4ef45 236#define UTF8_IS_ABOVE_LATIN1(c) ((U8)(c) >= 0xc4)
8850bf83 237
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238/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
239 * sequence contributes to the specification of the code point. In the bit
240 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
241 * real information */
1d72bdf6 242#define UTF_ACCUMULATION_SHIFT 6
b2635aa8 243
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244#if UVSIZE >= 8
245# define UTF8_QUAD_MAX UINT64_C(0x1000000000)
72164d3a 246#endif
6588300d 247
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248/* Internal macro to be used only in this file to aid in constructing other
249 * publicly accessible macros.
250 * The number of bytes required to express this uv in UTF-8, for just those
251 * uv's requiring 2 through 6 bytes, as these are common to all platforms and
252 * word sizes. The number of bytes needed is given by the number of leading 1
253 * bits in the start byte. There are 32 start bytes that have 2 initial 1 bits
254 * (C0-DF); there are 16 that have 3 initial 1 bits (E0-EF); 8 that have 4
255 * initial 1 bits (F0-F8); 4 that have 5 initial 1 bits (F9-FB), and 2 that
256 * have 6 initial 1 bits (FC-FD). The largest number a string of n bytes can
257 * represent is (the number of possible start bytes for 'n')
258 * * (the number of possiblities for each start byte
259 * The latter in turn is
260 * 2 ** ( (how many continuation bytes there are)
261 * * (the number of bits of information each
262 * continuation byte holds))
263 *
264 * If we were on a platform where we could use a fast find first set bit
265 * instruction (or count leading zeros instruction) this could be replaced by
266 * using that to find the log2 of the uv, and divide that by the number of bits
267 * of information in each continuation byte, adjusting for large cases and how
268 * much information is in a start byte for that length */
72164d3a 269#define __COMMON_UNI_SKIP(uv) \
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270 (UV) (uv) < (32 * (1U << ( UTF_ACCUMULATION_SHIFT))) ? 2 : \
271 (UV) (uv) < (16 * (1U << (2 * UTF_ACCUMULATION_SHIFT))) ? 3 : \
272 (UV) (uv) < ( 8 * (1U << (3 * UTF_ACCUMULATION_SHIFT))) ? 4 : \
273 (UV) (uv) < ( 4 * (1U << (4 * UTF_ACCUMULATION_SHIFT))) ? 5 : \
274 (UV) (uv) < ( 2 * (1U << (5 * UTF_ACCUMULATION_SHIFT))) ? 6 :
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275
276/* Internal macro to be used only in this file.
277 * This adds to __COMMON_UNI_SKIP the details at this platform's upper range.
278 * For 64-bit ASCII platforms, we need one more test
279 * to see if just 7 bytes is needed, or if the maximum is needed. For 32-bit
280 * ASCII platforms, everything is representable by 7 bytes */
281#ifdef UV_IS_QUAD
282# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) \
7028aeba 283 (UV) (uv) < ((UV) 1U << (6 * UTF_ACCUMULATION_SHIFT)) ? 7 : UTF8_MAXBYTES)
1d68d6cd 284#else
72164d3a 285# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) 7)
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286#endif
287
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288/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
289 * for more */
290#define QUESTION_MARK_CTRL DEL_NATIVE
291
292/* Surrogates, non-character code points and above-Unicode code points are
293 * problematic in some contexts. This allows code that needs to check for
294 * those to to quickly exclude the vast majority of code points it will
295 * encounter */
296#define isUTF8_POSSIBLY_PROBLEMATIC(c) ((U8) c >= 0xED)
72164d3a 297#define OFFUNISKIP(uv) ( OFFUNI_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
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298/*
299
300=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
301returns the number of bytes required to represent the code point C<cp> when
302encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
303255; a Unicode code point otherwise.
304
305=cut
306 */
fdb6583d 307#define UVCHR_SKIP(uv) ( UVCHR_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
5352a763 308
5d5376e2 309
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310#endif /* EBCDIC vs ASCII */
311
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312/* 2**UTF_ACCUMULATION_SHIFT - 1 */
313#define UTF_CONTINUATION_MASK ((U8) ((1U << UTF_ACCUMULATION_SHIFT) - 1))
314
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315/* 32 start bytes with UTF_ACCUMULATION_SHIFT bits of information each */
316#define MAX_UTF8_TWO_BYTE (32 * (1U << UTF_ACCUMULATION_SHIFT) - 1)
317
318/* constrained by EBCDIC which has 5 bits per continuation byte */
319#define MAX_PORTABLE_UTF8_TWO_BYTE (32 * (1U << 5) - 1)
320
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321/* The maximum number of UTF-8 bytes a single Unicode character can
322 * uppercase/lowercase/fold into. Unicode guarantees that the maximum
323 * expansion is UTF8_MAX_FOLD_CHAR_EXPAND characters, but any above-Unicode
324 * code point will fold to itself, so we only have to look at the expansion of
325 * the maximum Unicode code point. But this number may be less than the space
326 * occupied by a very large code point under Perl's extended UTF-8. We have to
327 * make it large enough to fit any single character. (It turns out that ASCII
328 * and EBCDIC differ in which is larger) */
329#define UTF8_MAXBYTES_CASE \
330 (UTF8_MAXBYTES >= (UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF)) \
331 ? UTF8_MAXBYTES \
332 : (UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF)))
333
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334/* Rest of these are attributes of Unicode and perl's internals rather than the
335 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
336 * this level; the macros that some of these call may have different
337 * definitions in the two encodings */
338
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339/* In domain restricted to ASCII, these may make more sense to the reader than
340 * the ones with Latin1 in the name */
341#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
342#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
343
344/* More or less misleadingly-named defines, retained for back compat */
345#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
346#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
347#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
348#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
349#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 350
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351/* This defines the 1-bits that are to be in the first byte of a multi-byte
352 * UTF-8 encoded character that give the number of bytes that comprise the
353 * character. 'len' is the number of bytes in the multi-byte sequence. */
354#define UTF_START_MARK(len) (((len) > 7) ? 0xFF : (0xFF & (0xFE << (7-(len)))))
355
356/* Masks out the initial one bits in a start byte, leaving the real data ones.
357 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
358 * multi-byte sequence that comprises the character. */
359#define UTF_START_MASK(len) (((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
360
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361/* Adds a UTF8 continuation byte 'new' of information to a running total code
362 * point 'old' of all the continuation bytes so far. This is designed to be
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363 * used in a loop to convert from UTF-8 to the code point represented. Note
364 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
365 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
366 * code point in process of being generated */
367#define UTF8_ACCUMULATE(old, new) (((old) << UTF_ACCUMULATION_SHIFT) \
368 | ((NATIVE_UTF8_TO_I8((U8)new)) \
369 & UTF_CONTINUATION_MASK))
d06134e5 370
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371/* If a value is anded with this, and the result is non-zero, then using the
372 * original value in UTF8_ACCUMULATE will overflow, shifting bits off the left
373 * */
374#define UTF_ACCUMULATION_OVERFLOW_MASK \
375 (((UV) UTF_CONTINUATION_MASK) << ((sizeof(UV) * CHARBITS) \
376 - UTF_ACCUMULATION_SHIFT))
377
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378/* This works in the face of malformed UTF-8. */
379#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) (UTF8_IS_DOWNGRADEABLE_START(*s) \
380 && ( (e) - (s) > 1) \
381 && UTF8_IS_CONTINUATION(*((s)+1)))
382
5aaebcb3 383/* Number of bytes a code point occupies in UTF-8. */
5352a763 384#define NATIVE_SKIP(uv) UVCHR_SKIP(uv)
bd18bd40 385
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386/* Most code which says UNISKIP is really thinking in terms of native code
387 * points (0-255) plus all those beyond. This is an imprecise term, but having
2accb712 388 * it means existing code continues to work. For precision, use UVCHR_SKIP,
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389 * NATIVE_SKIP, or OFFUNISKIP */
390#define UNISKIP(uv) UVCHR_SKIP(uv)
5aaebcb3 391
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392/* Longer, but more accurate name */
393#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
394
a62b247b
KW
395/* Convert a UTF-8 variant Latin1 character to a native code point value.
396 * Needs just one iteration of accumulate. Should be used only if it is known
397 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
398 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
399 * representable by two bytes (which turns out to be up through
400 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
401 * HI: a downgradable start byte;
402 * LO: continuation.
403 * */
404#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
405 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
406 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
407 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
408 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
409
94bb8c36 410/* Convert a two (not one) byte utf8 character to a native code point value.
2950f2a7
KW
411 * Needs just one iteration of accumulate. Should not be used unless it is
412 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
413 * Note that the result can be larger than 255 if the input character is not
414 * downgradable */
94bb8c36 415#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
635e76f5
KW
416 ( __ASSERT_(UTF8SKIP(HI) == 2) \
417 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 418 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 419 (LO))))
94bb8c36
KW
420
421/* Should never be used, and be deprecated */
422#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 423
bd18bd40
KW
424/*
425
426=for apidoc Am|STRLEN|UTF8SKIP|char* s
427returns the number of bytes in the UTF-8 encoded character whose first (perhaps
428only) byte is pointed to by C<s>.
429
430=cut
431 */
2a70536e
KW
432#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
433#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 434
2d1545e5
KW
435/* Most code that says 'UNI_' really means the native value for code points up
436 * through 255 */
437#define UNI_IS_INVARIANT(cp) UVCHR_IS_INVARIANT(cp)
438
15824458
KW
439/* Is the byte 'c' the same character when encoded in UTF-8 as when not. This
440 * works on both UTF-8 encoded strings and non-encoded, as it returns TRUE in
5fc230f1
KW
441 * each for the exact same set of bit patterns. It is valid on a subset of
442 * what UVCHR_IS_INVARIANT is valid on, so can just use that; and the compiler
443 * should optimize out anything extraneous given the implementation of the
444 * latter */
445#define UTF8_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
446
447/* Like the above, but its name implies a non-UTF8 input, which as the comments
448 * above show, doesn't matter as to its implementation */
38953e5a 449#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
d06134e5 450
48ccf5e1
KW
451/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
452 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
453 * it must be less than 0x3FF to work across both encodings. */
454
455/* These two are helper macros for the other three sets, and should not be used
456 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
1ff3baa2
KW
457 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
458 * for any code point */
48ccf5e1
KW
459#define __BASE_TWO_BYTE_HI(c, translate_function) \
460 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
461 | UTF_START_MARK(2))
462#define __BASE_TWO_BYTE_LO(c, translate_function) \
463 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
464 | UTF_CONTINUATION_MARK)
465
48ccf5e1
KW
466/* The next two macros should not be used. They were designed to be usable as
467 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 468 * regen/unicode_constants.pl instead */
48ccf5e1
KW
469#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
470#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
471
472/* The next two macros are used when the source should be a single byte
473 * character; checked for under DEBUGGING */
474#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 475 ( __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
48ccf5e1 476#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 477 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
48ccf5e1
KW
478
479/* These final two macros in the series are used when the source can be any
480 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
481 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
482 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 483 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
48ccf5e1
KW
484 * places, so the ~ works */
485#define UTF8_TWO_BYTE_HI(c) \
486 (__ASSERT_((sizeof(c) == 1) \
d52b8576 487 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 488 (__BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
48ccf5e1
KW
489#define UTF8_TWO_BYTE_LO(c) \
490 (__ASSERT_((sizeof(c) == 1) \
d52b8576 491 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 492 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 493
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494/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
495 * as it is only in overlongs. */
496#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
497
7e2040f0 498/*
e3036cf4 499 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
20df05f4
KW
500 * from an earlier version of these macros in which they didn't call the
501 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
502 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
503 * no need to do it again here
7e2040f0 504 */
e3036cf4
KW
505#define isIDFIRST_lazy_if(p,UTF) ((IN_BYTES || !UTF ) \
506 ? isIDFIRST(*(p)) \
507 : isIDFIRST_utf8((const U8*)p))
32636478
KW
508#define isWORDCHAR_lazy_if(p,UTF) ((IN_BYTES || (!UTF )) \
509 ? isWORDCHAR(*(p)) \
510 : isWORDCHAR_utf8((const U8*)p))
511#define isALNUM_lazy_if(p,UTF) isWORDCHAR_lazy_if(p,UTF)
1d72bdf6 512
89ebb4a3
JH
513#define UTF8_MAXLEN UTF8_MAXBYTES
514
8cb75cc8
KW
515/* A Unicode character can fold to up to 3 characters */
516#define UTF8_MAX_FOLD_CHAR_EXPAND 3
517
a98fe34d 518#define IN_BYTES (CopHINTS_get(PL_curcop) & HINT_BYTES)
bd18bd40
KW
519
520/*
521
522=for apidoc Am|bool|DO_UTF8|SV* sv
523Returns a bool giving whether or not the PV in C<sv> is to be treated as being
524encoded in UTF-8.
525
526You should use this I<after> a call to C<SvPV()> or one of its variants, in
527case any call to string overloading updates the internal UTF-8 encoding flag.
528
529=cut
530*/
0064a8a9 531#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
1ff3baa2
KW
532
533/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
534 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
535 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
536 * could be */
537#define IN_UNI_8_BIT \
d6ded950
KW
538 (((CopHINTS_get(PL_curcop) & (HINT_UNI_8_BIT)) \
539 || (CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
540 /* -1 below is for :not_characters */ \
541 && _is_in_locale_category(FALSE, -1))) \
542 && ! IN_BYTES)
b36bf33f 543
1d72bdf6 544
c76687c5
KW
545#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
546
547/* Allow first byte to be a continuation byte */
1d72bdf6 548#define UTF8_ALLOW_CONTINUATION 0x0002
c76687c5
KW
549
550/* Allow second... bytes to be non-continuation bytes */
1d72bdf6 551#define UTF8_ALLOW_NON_CONTINUATION 0x0004
949cf498
KW
552
553/* expecting more bytes than were available in the string */
554#define UTF8_ALLOW_SHORT 0x0008
555
556/* Overlong sequence; i.e., the code point can be specified in fewer bytes. */
557#define UTF8_ALLOW_LONG 0x0010
558
559#define UTF8_DISALLOW_SURROGATE 0x0020 /* Unicode surrogates */
560#define UTF8_WARN_SURROGATE 0x0040
561
562#define UTF8_DISALLOW_NONCHAR 0x0080 /* Unicode non-character */
563#define UTF8_WARN_NONCHAR 0x0100 /* code points */
564
565#define UTF8_DISALLOW_SUPER 0x0200 /* Super-set of Unicode: code */
566#define UTF8_WARN_SUPER 0x0400 /* points above the legal max */
567
d35f2ca5
KW
568/* Code points which never were part of the original UTF-8 standard, which only
569 * went up to 2 ** 31 - 1. Note that these all overflow a signed 32-bit word,
570 * The first byte of these code points is FE or FF on ASCII platforms. If the
571 * first byte is FF, it will overflow a 32-bit word. */
572#define UTF8_DISALLOW_ABOVE_31_BIT 0x0800
573#define UTF8_WARN_ABOVE_31_BIT 0x1000
574
575/* For back compat, these old names are misleading for UTF_EBCDIC */
576#define UTF8_DISALLOW_FE_FF UTF8_DISALLOW_ABOVE_31_BIT
577#define UTF8_WARN_FE_FF UTF8_WARN_ABOVE_31_BIT
949cf498
KW
578
579#define UTF8_CHECK_ONLY 0x2000
580
581/* For backwards source compatibility. They do nothing, as the default now
582 * includes what they used to mean. The first one's meaning was to allow the
583 * just the single non-character 0xFFFF */
584#define UTF8_ALLOW_FFFF 0
585#define UTF8_ALLOW_SURROGATE 0
586
d35f2ca5 587#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE \
93e6dbd6
KW
588 ( UTF8_DISALLOW_SUPER|UTF8_DISALLOW_NONCHAR \
589 |UTF8_DISALLOW_SURROGATE)
949cf498 590#define UTF8_WARN_ILLEGAL_INTERCHANGE \
93e6dbd6
KW
591 (UTF8_WARN_SUPER|UTF8_WARN_NONCHAR|UTF8_WARN_SURROGATE)
592#define UTF8_ALLOW_ANY \
593 (~( UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_DISALLOW_ABOVE_31_BIT \
594 |UTF8_WARN_ILLEGAL_INTERCHANGE|UTF8_WARN_ABOVE_31_BIT))
949cf498
KW
595#define UTF8_ALLOW_ANYUV \
596 (UTF8_ALLOW_EMPTY \
597 & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE|UTF8_WARN_ILLEGAL_INTERCHANGE))
9f7f3913
ST
598#define UTF8_ALLOW_DEFAULT (ckWARN(WARN_UTF8) ? 0 : \
599 UTF8_ALLOW_ANYUV)
1d72bdf6 600
0c58a72b
KW
601/* Several of the macros below have a second parameter that is currently
602 * unused; but could be used in the future to make sure that the input is
603 * well-formed. */
604
605#define UTF8_IS_SURROGATE(s, e) cBOOL(is_SURROGATE_utf8(s))
b96a92fb 606#define UTF8_IS_REPLACEMENT(s, send) cBOOL(is_REPLACEMENT_utf8_safe(s,send))
7131f24d
KW
607
608/* ASCII EBCDIC I8
609 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
610 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
611 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
a1776718
KW
612 *
613 * BE AWARE that this test doesn't rule out malformed code points, in
614 * particular overlongs */
7131f24d 615#ifdef EBCDIC /* Both versions assume well-formed UTF8 */
0c58a72b 616# define UTF8_IS_SUPER(s, e) (NATIVE_UTF8_TO_I8(* (U8*) (s)) >= 0xF9 \
bc3632a8 617 && (NATIVE_UTF8_TO_I8(* (U8*) (s)) > 0xF9 \
a3481822 618 || (NATIVE_UTF8_TO_I8(* ((U8*) (s) + 1)) >= 0xA2)))
7131f24d 619#else
0c58a72b
KW
620# define UTF8_IS_SUPER(s, e) (*(U8*) (s) >= 0xF4 \
621 && (*(U8*) (s) > 0xF4 || (*((U8*) (s) + 1) >= 0x90)))
7131f24d
KW
622#endif
623
b96a92fb
KW
624/* These are now machine generated, and the 'given' clause is no longer
625 * applicable */
0c58a72b 626#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
b96a92fb 627 cBOOL(is_NONCHAR_utf8(s))
0c58a72b
KW
628#define UTF8_IS_NONCHAR(s, e) \
629 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 630
c867b360
JH
631#define UNICODE_SURROGATE_FIRST 0xD800
632#define UNICODE_SURROGATE_LAST 0xDFFF
633#define UNICODE_REPLACEMENT 0xFFFD
634#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 635
b851fbc1 636/* Though our UTF-8 encoding can go beyond this,
c76687c5 637 * let's be conservative and do as Unicode says. */
b851fbc1
JH
638#define PERL_UNICODE_MAX 0x10FFFF
639
d35f2ca5
KW
640#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
641#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
642#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
643#define UNICODE_WARN_ABOVE_31_BIT 0x0008 /* Above 0x7FFF_FFFF */
644#define UNICODE_DISALLOW_SURROGATE 0x0010
645#define UNICODE_DISALLOW_NONCHAR 0x0020
646#define UNICODE_DISALLOW_SUPER 0x0040
647#define UNICODE_DISALLOW_ABOVE_31_BIT 0x0080
bb88be5f
KW
648#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
649 (UNICODE_WARN_SURROGATE|UNICODE_WARN_NONCHAR|UNICODE_WARN_SUPER)
650#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
651 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_NONCHAR|UNICODE_DISALLOW_SUPER)
949cf498
KW
652
653/* For backward source compatibility, as are now the default */
654#define UNICODE_ALLOW_SURROGATE 0
655#define UNICODE_ALLOW_SUPER 0
656#define UNICODE_ALLOW_ANY 0
b851fbc1 657
1d72bdf6
NIS
658#define UNICODE_IS_SURROGATE(c) ((c) >= UNICODE_SURROGATE_FIRST && \
659 (c) <= UNICODE_SURROGATE_LAST)
a10ec373 660#define UNICODE_IS_REPLACEMENT(c) ((c) == UNICODE_REPLACEMENT)
872c91ae 661#define UNICODE_IS_BYTE_ORDER_MARK(c) ((c) == UNICODE_BYTE_ORDER_MARK)
7131f24d
KW
662#define UNICODE_IS_NONCHAR(c) ((c >= 0xFDD0 && c <= 0xFDEF) \
663 /* The other noncharacters end in FFFE or FFFF, which \
664 * the mask below catches both of, but beyond the last \
665 * official unicode code point, they aren't \
666 * noncharacters, since those aren't Unicode \
667 * characters at all */ \
668 || ((((c & 0xFFFE) == 0xFFFE)) && ! UNICODE_IS_SUPER(c)))
669#define UNICODE_IS_SUPER(c) ((c) > PERL_UNICODE_MAX)
d35f2ca5 670#define UNICODE_IS_ABOVE_31_BIT(uv) ((UV) (uv) > 0x7FFFFFFF)
1d72bdf6 671
ec34087a
KW
672#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
673#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
674 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
675#define MICRO_SIGN MICRO_SIGN_NATIVE
676#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
677 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
678#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
679 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
680#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
681#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
682#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 683#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
684#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
685 of MICRON */
686#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW
687#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
688# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
689#endif
74894415
KW
690#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
691#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 692#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
693#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
694#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
695#define KELVIN_SIGN 0x212A
696#define ANGSTROM_SIGN 0x212B
09091399 697
9e55ce06 698#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41
JH
699#define UNI_DISPLAY_BACKSLASH 0x0002
700#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
701#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 702
5cd46e1f
KW
703#define ANYOF_FOLD_SHARP_S(node, input, end) \
704 (ANYOF_BITMAP_TEST(node, LATIN_SMALL_LETTER_SHARP_S) && \
137165a6 705 (ANYOF_NONBITMAP(node)) && \
39065660 706 (ANYOF_FLAGS(node) & ANYOF_LOC_NONBITMAP_FOLD) && \
07b6858f 707 ((end) > (input) + 1) && \
305b8651 708 isALPHA_FOLD_EQ((input)[0], 's'))
6302f837 709
ebc501f0 710#define SHARP_S_SKIP 2
3b0fc154 711
a4f7a67c
KW
712/* If you want to exclude surrogates, and beyond legal Unicode, see the blame
713 * log for earlier versions which gave details for these */
4d646140 714
6302f837
KW
715/* A helper macro for isUTF8_CHAR, so use that one, and not this one. This is
716 * retained solely for backwards compatibility and may be deprecated and
717 * removed in a future Perl version.
718 *
719 * regen/regcharclass.pl generates is_UTF8_CHAR_utf8() macros for up to these
d9f92374
KW
720 * number of bytes. So this has to be coordinated with that file */
721#ifdef EBCDIC
722# define IS_UTF8_CHAR_FAST(n) ((n) <= 3)
723#else
724# define IS_UTF8_CHAR_FAST(n) ((n) <= 4)
725#endif
726
4d646140 727#ifndef EBCDIC
6302f837
KW
728/* A helper macro for isUTF8_CHAR, so use that one instead of this. This was
729 * generated by regen/regcharclass.pl, and then moved here. The lines that
730 * generated it were then commented out. This was done solely because it takes
731 * on the order of 10 minutes to generate, and is never going to change, unless
732 * the generated code is improved.
733 *
1ff3baa2
KW
734 * The EBCDIC versions have been cut to not cover all of legal Unicode,
735 * otherwise they take too long to generate; besides there is a separate one
736 * for each code page, so they are in regcharclass.h instead of here */
39a0f513 737/*
5dca9278 738 UTF8_CHAR: Matches legal UTF-8 encoded characters from 2 through 4 bytes
39a0f513 739
5dca9278 740 0x80 - 0x1FFFFF
39a0f513 741*/
4d646140 742/*** GENERATED CODE ***/
5dca9278
KW
743#define is_UTF8_CHAR_utf8_no_length_checks(s) \
744( ( 0xC2 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xDF ) ? \
745 ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
746: ( 0xE0 == ((U8*)s)[0] ) ? \
747 ( ( ( ( ((U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
748: ( 0xE1 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xEF ) ? \
749 ( ( ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
750: ( 0xF0 == ((U8*)s)[0] ) ? \
751 ( ( ( ( 0x90 <= ((U8*)s)[1] && ((U8*)s)[1] <= 0xBF ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
752: ( ( ( ( 0xF1 <= ((U8*)s)[0] && ((U8*)s)[0] <= 0xF7 ) && ( ( ((U8*)s)[1] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )
4d646140 753#endif
3b0fc154 754
6302f837 755/*
5dca9278
KW
756
757=for apidoc Am|STRLEN|isUTF8_CHAR|const U8 *s|const U8 *e
758
759Returns the number of bytes beginning at C<s> which form a legal UTF-8 (or
61b16eb9
KW
760UTF-EBCDIC) encoded character, looking no further than S<C<e - s>> bytes into
761C<s>. Returns 0 if the sequence starting at C<s> through S<C<e - 1>> is not
762well-formed UTF-8.
6302f837
KW
763
764Note that an INVARIANT character (i.e. ASCII on non-EBCDIC
5dca9278
KW
765machines) is a valid UTF-8 character.
766
767=cut
768*/
6302f837 769
dd9bc2b0 770#define isUTF8_CHAR(s, e) (UNLIKELY((e) <= (s)) \
6302f837
KW
771 ? 0 \
772 : (UTF8_IS_INVARIANT(*s)) \
773 ? 1 \
dd9bc2b0 774 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
6302f837 775 ? 0 \
dd9bc2b0 776 : LIKELY(IS_UTF8_CHAR_FAST(UTF8SKIP(s))) \
5dca9278 777 ? is_UTF8_CHAR_utf8_no_length_checks(s) \
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778 : _is_utf8_char_slow(s, e))
779
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780#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
781
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782/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
783 * retained solely for backwards compatibility */
784#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 785
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786#endif /* H_UTF8 */
787
e9a8c099 788/*
14d04a33 789 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 790 */