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[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
8871a094 53This is a misleadingly-named synonym for L</is_utf8_invariant_string>.
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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
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56than just the ASCII characters, so C<is_utf8_invariant_string> is preferred.
57
58=for apidoc is_invariant_string
59
60This is a somewhat misleadingly-named synonym for L</is_utf8_invariant_string>.
61C<is_utf8_invariant_string> is preferred, as it indicates under what conditions
62the string is invariant.
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63
64=cut
65*/
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66#define is_ascii_string(s, len) is_utf8_invariant_string(s, len)
67#define is_invariant_string(s, len) is_utf8_invariant_string(s, len)
7bbfa158 68
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69#define uvchr_to_utf8(a,b) uvchr_to_utf8_flags(a,b,0)
70#define uvchr_to_utf8_flags(d,uv,flags) \
71 uvoffuni_to_utf8_flags(d,NATIVE_TO_UNI(uv),flags)
72#define utf8_to_uvchr_buf(s, e, lenp) \
842991ae 73 utf8n_to_uvchr(s, (U8*)(e) - (U8*)(s), lenp, \
de69f3af 74 ckWARN_d(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY)
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75#define utf8n_to_uvchr(s, len, lenp, flags) \
76 utf8n_to_uvchr_error(s, len, lenp, flags, 0)
de69f3af 77
a0270393 78#define to_uni_fold(c, p, lenp) _to_uni_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
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79#define to_utf8_fold(c, p, lenp) _to_utf8_fold_flags(c, p, lenp, FOLD_FLAGS_FULL)
80#define to_utf8_lower(a,b,c) _to_utf8_lower_flags(a,b,c,0)
81#define to_utf8_upper(a,b,c) _to_utf8_upper_flags(a,b,c,0)
82#define to_utf8_title(a,b,c) _to_utf8_title_flags(a,b,c,0)
36bb2ab6 83
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84#define foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
85 foldEQ_utf8_flags(s1, pe1, l1, u1, s2, pe2, l2, u2, 0)
baa60164 86#define FOLDEQ_UTF8_NOMIX_ASCII (1 << 0)
cea315b6 87#define FOLDEQ_LOCALE (1 << 1)
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88#define FOLDEQ_S1_ALREADY_FOLDED (1 << 2)
89#define FOLDEQ_S2_ALREADY_FOLDED (1 << 3)
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90#define FOLDEQ_S1_FOLDS_SANE (1 << 4)
91#define FOLDEQ_S2_FOLDS_SANE (1 << 5)
a33c29bc 92
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93#define ibcmp_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2) \
94 cBOOL(! foldEQ_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2))
95
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96#ifdef EBCDIC
97/* The equivalent of these macros but implementing UTF-EBCDIC
98 are in the following header file:
99 */
100
101#include "utfebcdic.h"
fd7cb289 102
d06134e5 103#else /* ! EBCDIC */
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104START_EXTERN_C
105
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106/* How wide can a single UTF-8 encoded character become in bytes. */
107/* NOTE: Strictly speaking Perl's UTF-8 should not be called UTF-8 since UTF-8
108 * is an encoding of Unicode, and Unicode's upper limit, 0x10FFFF, can be
109 * expressed with 4 bytes. However, Perl thinks of UTF-8 as a way to encode
110 * non-negative integers in a binary format, even those above Unicode */
111#define UTF8_MAXBYTES 13
112
a0ed51b3 113#ifdef DOINIT
6f06b55f 114EXTCONST unsigned char PL_utf8skip[] = {
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115/* 0x00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
116/* 0x10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
117/* 0x20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
118/* 0x30 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
119/* 0x40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
120/* 0x50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
121/* 0x60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
122/* 0x70 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ascii */
123/* 0x80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
124/* 0x90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
125/* 0xA0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
126/* 0xB0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* bogus: continuation byte */
127/* 0xC0 */ 2,2, /* overlong */
1ff3baa2 128/* 0xC2 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0080 to U+03FF */
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129/* 0xD0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* U+0400 to U+07FF */
130/* 0xE0 */ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, /* U+0800 to U+FFFF */
131/* 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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132 /* Perl extended (never was official UTF-8). Up to 36 bit */
133/* 0xFE */ 7,
134 /* More extended, Up to 72 bits (64-bit + reserved) */
111e8ed9 135/* 0xFF */ UTF8_MAXBYTES
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136};
137#else
6f06b55f 138EXTCONST unsigned char PL_utf8skip[];
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139#endif
140
73c4f7a1 141END_EXTERN_C
7e2040f0 142
1a3756de 143#if defined(_MSC_VER) && _MSC_VER < 1400
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144/* older MSVC versions have a smallish macro buffer */
145#define PERL_SMALL_MACRO_BUFFER
146#endif
147
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148/* Native character to/from iso-8859-1. Are the identity functions on ASCII
149 * platforms */
6f6d1bab 150#ifdef PERL_SMALL_MACRO_BUFFER
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151#define NATIVE_TO_LATIN1(ch) ((U8)(ch))
152#define LATIN1_TO_NATIVE(ch) ((U8)(ch))
6f6d1bab 153#else
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154#define NATIVE_TO_LATIN1(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
155#define LATIN1_TO_NATIVE(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
6f6d1bab 156#endif
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157
158/* I8 is an intermediate version of UTF-8 used only in UTF-EBCDIC. We thus
159 * consider it to be identical to UTF-8 on ASCII platforms. Strictly speaking
160 * UTF-8 and UTF-EBCDIC are two different things, but we often conflate them
161 * because they are 8-bit encodings that serve the same purpose in Perl, and
162 * rarely do we need to distinguish them. The term "NATIVE_UTF8" applies to
163 * whichever one is applicable on the current platform */
6f6d1bab 164#ifdef PERL_SMALL_MACRO_BUFFER
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165#define NATIVE_UTF8_TO_I8(ch) ((U8) (ch))
166#define I8_TO_NATIVE_UTF8(ch) ((U8) (ch))
6f6d1bab 167#else
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168#define NATIVE_UTF8_TO_I8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
169#define I8_TO_NATIVE_UTF8(ch) (__ASSERT_(FITS_IN_8_BITS(ch)) ((U8) (ch)))
6f6d1bab 170#endif
59a449d5 171
1d72bdf6 172/* Transforms in wide UV chars */
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173#define UNI_TO_NATIVE(ch) ((UV) (ch))
174#define NATIVE_TO_UNI(ch) ((UV) (ch))
d7578b48 175
877d9f0d 176/*
9041c2e3 177
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178 The following table is from Unicode 3.2, plus the Perl extensions for above
179 U+10FFFF
877d9f0d 180
a14e0a36 181 Code Points 1st Byte 2nd Byte 3rd 4th 5th 6th 7th 8th-13th
877d9f0d 182
375122d7 183 U+0000..U+007F 00..7F
e1b711da 184 U+0080..U+07FF * C2..DF 80..BF
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185 U+0800..U+0FFF E0 * A0..BF 80..BF
186 U+1000..U+CFFF E1..EC 80..BF 80..BF
187 U+D000..U+D7FF ED 80..9F 80..BF
188 U+D800..U+DFFF ED A0..BF 80..BF (surrogates)
189 U+E000..U+FFFF EE..EF 80..BF 80..BF
190 U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
191 U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
192 U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
193 Below are above-Unicode code points
194 U+110000..U+13FFFF F4 90..BF 80..BF 80..BF
195 U+110000..U+1FFFFF F5..F7 80..BF 80..BF 80..BF
196 U+200000..U+FFFFFF F8 * 88..BF 80..BF 80..BF 80..BF
197U+1000000..U+3FFFFFF F9..FB 80..BF 80..BF 80..BF 80..BF
198U+4000000..U+3FFFFFFF FC * 84..BF 80..BF 80..BF 80..BF 80..BF
199U+40000000..U+7FFFFFFF FD 80..BF 80..BF 80..BF 80..BF 80..BF
200U+80000000..U+FFFFFFFFF FE * 82..BF 80..BF 80..BF 80..BF 80..BF 80..BF
201U+1000000000.. FF 80..BF 80..BF 80..BF 80..BF 80..BF * 81..BF 80..BF
877d9f0d 202
e1b711da 203Note the gaps before several of the byte entries above marked by '*'. These are
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204caused by legal UTF-8 avoiding non-shortest encodings: it is technically
205possible to UTF-8-encode a single code point in different ways, but that is
206explicitly forbidden, and the shortest possible encoding should always be used
15824458 207(and that is what Perl does). The non-shortest ones are called 'overlongs'.
8c007b5a 208
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209 */
210
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211/*
212 Another way to look at it, as bits:
213
b2635aa8 214 Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
8c007b5a 215
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216 0aaa aaaa 0aaa aaaa
217 0000 0bbb bbaa aaaa 110b bbbb 10aa aaaa
218 cccc bbbb bbaa aaaa 1110 cccc 10bb bbbb 10aa aaaa
219 00 000d ddcc cccc bbbb bbaa aaaa 1111 0ddd 10cc cccc 10bb bbbb 10aa aaaa
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220
221As you can see, the continuation bytes all begin with C<10>, and the
e1b711da 222leading bits of the start byte tell how many bytes there are in the
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223encoded character.
224
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225Perl's extended UTF-8 means we can have start bytes up through FF, though any
226beginning with FF yields a code point that is too large for 32-bit ASCII
227platforms. FF signals to use 13 bytes for the encoded character. This breaks
228the paradigm that the number of leading bits gives how many total bytes there
229are in the character.
65ab9279 230
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231*/
232
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233/* Anything larger than this will overflow the word if it were converted into a UV */
234#if defined(UV_IS_QUAD)
235# define HIGHEST_REPRESENTABLE_UTF8 "\xFF\x80\x8F\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF"
236#else
237# define HIGHEST_REPRESENTABLE_UTF8 "\xFE\x83\xBF\xBF\xBF\xBF\xBF"
238#endif
239
6c88483e 240/* Is the representation of the Unicode code point 'cp' the same regardless of
15824458 241 * being encoded in UTF-8 or not? */
2d1545e5 242#define OFFUNI_IS_INVARIANT(cp) isASCII(cp)
15824458 243
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244/*
245=for apidoc Am|bool|UVCHR_IS_INVARIANT|UV cp
246
247Evaluates to 1 if the representation of code point C<cp> is the same whether or
248not it is encoded in UTF-8; otherwise evaluates to 0. UTF-8 invariant
249characters can be copied as-is when converting to/from UTF-8, saving time.
250C<cp> is Unicode if above 255; otherwise is platform-native.
251
252=cut
253 */
254
cf1be84e 255#define UVCHR_IS_INVARIANT(cp) OFFUNI_IS_INVARIANT(cp)
38953e5a 256
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257/* This defines the bits that are to be in the continuation bytes of a multi-byte
258 * UTF-8 encoded character that mark it is a continuation byte. */
259#define UTF_CONTINUATION_MARK 0x80
260
a95ec4fb 261/* Misleadingly named: is the UTF8-encoded byte 'c' part of a variant sequence
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262 * in UTF-8? This is the inverse of UTF8_IS_INVARIANT. The |0 makes sure this
263 * isn't mistakenly called with a ptr argument */
264#define UTF8_IS_CONTINUED(c) (((U8)((c) | 0)) & UTF_CONTINUATION_MARK)
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265
266/* Is the byte 'c' the first byte of a multi-byte UTF8-8 encoded sequence?
267 * This doesn't catch invariants (they are single-byte). It also excludes the
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268 * illegal overlong sequences that begin with C0 and C1. The |0 makes sure
269 * this isn't mistakenly called with a ptr argument */
270#define UTF8_IS_START(c) (((U8)((c) | 0)) >= 0xc2)
15824458 271
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272/* For use in UTF8_IS_CONTINUATION() below */
273#define UTF_IS_CONTINUATION_MASK 0xC0
274
15824458 275/* Is the byte 'c' part of a multi-byte UTF8-8 encoded sequence, and not the
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276 * first byte thereof? The |0 makes sure this isn't mistakenly called with a
277 * ptr argument */
858cd8ab 278#define UTF8_IS_CONTINUATION(c) \
5c06326b 279 ((((U8)((c) | 0)) & UTF_IS_CONTINUATION_MASK) == UTF_CONTINUATION_MARK)
0ae1fa71 280
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281/* Is the UTF8-encoded byte 'c' the first byte of a two byte sequence? Use
282 * UTF8_IS_NEXT_CHAR_DOWNGRADEABLE() instead if the input isn't known to
283 * be well-formed. Masking with 0xfe allows the low bit to be 0 or 1; thus
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284 * this matches 0xc[23]. The |0 makes sure this isn't mistakenly called with a
285 * ptr argument */
286#define UTF8_IS_DOWNGRADEABLE_START(c) ((((U8)((c) | 0)) & 0xfe) == 0xc2)
4ab10950 287
15824458 288/* Is the UTF8-encoded byte 'c' the first byte of a sequence of bytes that
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289 * represent a code point > 255? The |0 makes sure this isn't mistakenly
290 * called with a ptr argument */
291#define UTF8_IS_ABOVE_LATIN1(c) (((U8)((c) | 0)) >= 0xc4)
8850bf83 292
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293/* This is the number of low-order bits a continuation byte in a UTF-8 encoded
294 * sequence contributes to the specification of the code point. In the bit
295 * maps above, you see that the first 2 bits are a constant '10', leaving 6 of
296 * real information */
1d72bdf6 297#define UTF_ACCUMULATION_SHIFT 6
b2635aa8 298
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299/* ^? is defined to be DEL on ASCII systems. See the definition of toCTRL()
300 * for more */
301#define QUESTION_MARK_CTRL DEL_NATIVE
302
303/* Surrogates, non-character code points and above-Unicode code points are
304 * problematic in some contexts. This allows code that needs to check for
305 * those to to quickly exclude the vast majority of code points it will
306 * encounter */
307#define isUTF8_POSSIBLY_PROBLEMATIC(c) ((U8) c >= 0xED)
308
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309/* A helper macro for isUTF8_CHAR, so use that one instead of this. This was
310 * generated by regen/regcharclass.pl, and then moved here. Then it was
311 * hand-edited to add some LIKELY() calls, presuming that malformations are
312 * unlikely. The lines that generated it were then commented out. This was
313 * done because it takes on the order of 10 minutes to generate, and is never
314 * going to change, unless the generated code is improved, and figuring out
315 * the LIKELYs there would be hard.
316 *
317 UTF8_CHAR: Matches legal UTF-8 variant code points up through 0x1FFFFFF
318
319 0x80 - 0x1FFFFF
320*/
321/*** GENERATED CODE ***/
322#define is_UTF8_CHAR_utf8_no_length_checks(s) \
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323( ( 0xC2 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xDF ) ? \
324 ( LIKELY( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
325: ( 0xE0 == ((const U8*)s)[0] ) ? \
326 ( LIKELY( ( ( ((const U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
327: ( 0xE1 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xEF ) ? \
328 ( LIKELY( ( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
329: ( 0xF0 == ((const U8*)s)[0] ) ? \
330 ( LIKELY( ( ( 0x90 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0xBF ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
331: ( ( ( ( 0xF1 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xF7 ) && LIKELY( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) ) && LIKELY( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) && LIKELY( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )
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332
333/* The above macro handles UTF-8 that has this start byte as the maximum */
334#define _IS_UTF8_CHAR_HIGHEST_START_BYTE 0xF7
335
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336/* A helper macro for isSTRICT_UTF8_CHAR, so use that one instead of this.
337 * Like is_UTF8_CHAR_utf8_no_length_checks(), this was moved here and LIKELYs
338 * added manually.
339 *
340 STRICT_UTF8_CHAR: Matches legal Unicode UTF-8 variant code points, no
341 surrrogates nor non-character code points
342*/
343/*** GENERATED CODE ***/
344#define is_STRICT_UTF8_CHAR_utf8_no_length_checks(s) \
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345( ( 0xC2 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xDF ) ? \
346 ( LIKELY( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
347: ( 0xE0 == ((const U8*)s)[0] ) ? \
348 ( LIKELY( ( ( ((const U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
349: ( ( 0xE1 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xEC ) || 0xEE == ((const U8*)s)[0] ) ?\
350 ( ( ( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
351: ( 0xED == ((const U8*)s)[0] ) ? \
352 ( LIKELY( ( ( ((const U8*)s)[1] & 0xE0 ) == 0x80 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
353: ( 0xEF == ((const U8*)s)[0] ) ? \
354 ( ( ( 0x80 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0xB6 ) || ( 0xB8 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0xBE ) ) ?\
355 ( LIKELY( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ? 3 : 0 ) \
356 : ( 0xB7 == ((const U8*)s)[1] ) ? \
357 ( LIKELY( ( ((const U8*)s)[2] & 0xF0 ) == 0x80 || ( ((const U8*)s)[2] & 0xF0 ) == 0xB0 ) ? 3 : 0 )\
358 : ( ( 0xBF == ((const U8*)s)[1] ) && ( 0x80 <= ((const U8*)s)[2] && ((const U8*)s)[2] <= 0xBD ) ) ? 3 : 0 )\
359: ( 0xF0 == ((const U8*)s)[0] ) ? \
360 ( ( ( 0x90 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0x9E ) || ( 0xA0 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0xAE ) || ( 0xB0 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0xBE ) ) ?\
361 ( LIKELY( ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
362 : ( ((const U8*)s)[1] == 0x9F || ( ( ((const U8*)s)[1] & 0xEF ) == 0xAF ) ) ? \
363 ( ( 0x80 <= ((const U8*)s)[2] && ((const U8*)s)[2] <= 0xBE ) ? \
364 ( LIKELY( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ? 4 : 0 ) \
365 : LIKELY( ( 0xBF == ((const U8*)s)[2] ) && ( 0x80 <= ((const U8*)s)[3] && ((const U8*)s)[3] <= 0xBD ) ) ? 4 : 0 )\
e23e8bc1 366 : 0 ) \
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367: ( 0xF1 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xF3 ) ? \
368 ( ( ( ( ((const U8*)s)[1] & 0xC8 ) == 0x80 ) || ( ( ((const U8*)s)[1] & 0xCC ) == 0x88 ) || ( ( ((const U8*)s)[1] & 0xCE ) == 0x8C ) || ( ( ((const U8*)s)[1] & 0xCF ) == 0x8E ) ) ?\
369 ( LIKELY( ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
370 : ( ( ((const U8*)s)[1] & 0xCF ) == 0x8F ) ? \
371 ( ( 0x80 <= ((const U8*)s)[2] && ((const U8*)s)[2] <= 0xBE ) ? \
372 ( LIKELY( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ? 4 : 0 ) \
373 : LIKELY( ( 0xBF == ((const U8*)s)[2] ) && ( 0x80 <= ((const U8*)s)[3] && ((const U8*)s)[3] <= 0xBD ) ) ? 4 : 0 )\
e23e8bc1 374 : 0 ) \
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375: ( 0xF4 == ((const U8*)s)[0] ) ? \
376 ( ( 0x80 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0x8E ) ? \
377 ( LIKELY( ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
378 : ( 0x8F == ((const U8*)s)[1] ) ? \
379 ( ( 0x80 <= ((const U8*)s)[2] && ((const U8*)s)[2] <= 0xBE ) ? \
380 ( LIKELY( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ? 4 : 0 ) \
381 : LIKELY( ( 0xBF == ((const U8*)s)[2] ) && ( 0x80 <= ((const U8*)s)[3] && ((const U8*)s)[3] <= 0xBD ) ) ? 4 : 0 )\
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382 : 0 ) \
383: 0 )
384
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385/* Similarly,
386 C9_STRICT_UTF8_CHAR: Matches legal Unicode UTF-8 variant code
387 points, no surrogates
388 0x0080 - 0xD7FF
389 0xE000 - 0x10FFFF
390*/
391/*** GENERATED CODE ***/
392#define is_C9_STRICT_UTF8_CHAR_utf8_no_length_checks(s) \
9f2eed98
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393( ( 0xC2 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xDF ) ? \
394 ( LIKELY( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) ? 2 : 0 ) \
395: ( 0xE0 == ((const U8*)s)[0] ) ? \
396 ( LIKELY( ( ( ((const U8*)s)[1] & 0xE0 ) == 0xA0 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
397: ( ( 0xE1 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xEC ) || ( ((const U8*)s)[0] & 0xFE ) == 0xEE ) ?\
398 ( LIKELY( ( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
399: ( 0xED == ((const U8*)s)[0] ) ? \
400 ( LIKELY( ( ( ((const U8*)s)[1] & 0xE0 ) == 0x80 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) ? 3 : 0 )\
401: ( 0xF0 == ((const U8*)s)[0] ) ? \
402 ( LIKELY( ( ( 0x90 <= ((const U8*)s)[1] && ((const U8*)s)[1] <= 0xBF ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
403: ( 0xF1 <= ((const U8*)s)[0] && ((const U8*)s)[0] <= 0xF3 ) ? \
404 ( LIKELY( ( ( ( ((const U8*)s)[1] & 0xC0 ) == 0x80 ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )\
405: LIKELY( ( ( ( 0xF4 == ((const U8*)s)[0] ) && ( ( ((const U8*)s)[1] & 0xF0 ) == 0x80 ) ) && ( ( ((const U8*)s)[2] & 0xC0 ) == 0x80 ) ) && ( ( ((const U8*)s)[3] & 0xC0 ) == 0x80 ) ) ? 4 : 0 )
a82be82b 406
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407#endif /* EBCDIC vs ASCII */
408
409/* 2**UTF_ACCUMULATION_SHIFT - 1 */
410#define UTF_CONTINUATION_MASK ((U8) ((1U << UTF_ACCUMULATION_SHIFT) - 1))
411
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412/* Internal macro to be used only in this file to aid in constructing other
413 * publicly accessible macros.
414 * The number of bytes required to express this uv in UTF-8, for just those
415 * uv's requiring 2 through 6 bytes, as these are common to all platforms and
416 * word sizes. The number of bytes needed is given by the number of leading 1
417 * bits in the start byte. There are 32 start bytes that have 2 initial 1 bits
418 * (C0-DF); there are 16 that have 3 initial 1 bits (E0-EF); 8 that have 4
419 * initial 1 bits (F0-F8); 4 that have 5 initial 1 bits (F9-FB), and 2 that
420 * have 6 initial 1 bits (FC-FD). The largest number a string of n bytes can
421 * represent is (the number of possible start bytes for 'n')
422 * * (the number of possiblities for each start byte
423 * The latter in turn is
424 * 2 ** ( (how many continuation bytes there are)
425 * * (the number of bits of information each
426 * continuation byte holds))
427 *
428 * If we were on a platform where we could use a fast find first set bit
429 * instruction (or count leading zeros instruction) this could be replaced by
430 * using that to find the log2 of the uv, and divide that by the number of bits
431 * of information in each continuation byte, adjusting for large cases and how
432 * much information is in a start byte for that length */
72164d3a 433#define __COMMON_UNI_SKIP(uv) \
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434 (UV) (uv) < (32 * (1U << ( UTF_ACCUMULATION_SHIFT))) ? 2 : \
435 (UV) (uv) < (16 * (1U << (2 * UTF_ACCUMULATION_SHIFT))) ? 3 : \
436 (UV) (uv) < ( 8 * (1U << (3 * UTF_ACCUMULATION_SHIFT))) ? 4 : \
437 (UV) (uv) < ( 4 * (1U << (4 * UTF_ACCUMULATION_SHIFT))) ? 5 : \
438 (UV) (uv) < ( 2 * (1U << (5 * UTF_ACCUMULATION_SHIFT))) ? 6 :
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439
440/* Internal macro to be used only in this file.
441 * This adds to __COMMON_UNI_SKIP the details at this platform's upper range.
fed423a5 442 * For any-sized EBCDIC platforms, or 64-bit ASCII ones, we need one more test
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443 * to see if just 7 bytes is needed, or if the maximum is needed. For 32-bit
444 * ASCII platforms, everything is representable by 7 bytes */
fed423a5 445#if defined(UV_IS_QUAD) || defined(EBCDIC)
72164d3a 446# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) \
7028aeba 447 (UV) (uv) < ((UV) 1U << (6 * UTF_ACCUMULATION_SHIFT)) ? 7 : UTF8_MAXBYTES)
1d68d6cd 448#else
72164d3a 449# define __BASE_UNI_SKIP(uv) (__COMMON_UNI_SKIP(uv) 7)
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450#endif
451
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452/* The next two macros use the base macro defined above, and add in the tests
453 * at the low-end of the range, for just 1 byte, yielding complete macros,
454 * publicly accessible. */
455
456/* Input is a true Unicode (not-native) code point */
457#define OFFUNISKIP(uv) (OFFUNI_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
2084b489 458
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459/*
460
461=for apidoc Am|STRLEN|UVCHR_SKIP|UV cp
462returns the number of bytes required to represent the code point C<cp> when
463encoded as UTF-8. C<cp> is a native (ASCII or EBCDIC) code point if less than
464255; a Unicode code point otherwise.
465
466=cut
467 */
fdb6583d 468#define UVCHR_SKIP(uv) ( UVCHR_IS_INVARIANT(uv) ? 1 : __BASE_UNI_SKIP(uv))
5352a763 469
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470/* The largest code point representable by two UTF-8 bytes on this platform.
471 * As explained in the comments for __COMMON_UNI_SKIP, 32 start bytes with
fed423a5 472 * UTF_ACCUMULATION_SHIFT bits of information each */
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473#define MAX_UTF8_TWO_BYTE (32 * (1U << UTF_ACCUMULATION_SHIFT) - 1)
474
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475/* The largest code point representable by two UTF-8 bytes on any platform that
476 * Perl runs on. This value is constrained by EBCDIC which has 5 bits per
477 * continuation byte */
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478#define MAX_PORTABLE_UTF8_TWO_BYTE (32 * (1U << 5) - 1)
479
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480/* The maximum number of UTF-8 bytes a single Unicode character can
481 * uppercase/lowercase/fold into. Unicode guarantees that the maximum
482 * expansion is UTF8_MAX_FOLD_CHAR_EXPAND characters, but any above-Unicode
483 * code point will fold to itself, so we only have to look at the expansion of
484 * the maximum Unicode code point. But this number may be less than the space
485 * occupied by a very large code point under Perl's extended UTF-8. We have to
486 * make it large enough to fit any single character. (It turns out that ASCII
487 * and EBCDIC differ in which is larger) */
488#define UTF8_MAXBYTES_CASE \
489 (UTF8_MAXBYTES >= (UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF)) \
490 ? UTF8_MAXBYTES \
491 : (UTF8_MAX_FOLD_CHAR_EXPAND * OFFUNISKIP(0x10FFFF)))
492
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493/* Rest of these are attributes of Unicode and perl's internals rather than the
494 * encoding, or happen to be the same in both ASCII and EBCDIC (at least at
495 * this level; the macros that some of these call may have different
496 * definitions in the two encodings */
497
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498/* In domain restricted to ASCII, these may make more sense to the reader than
499 * the ones with Latin1 in the name */
500#define NATIVE_TO_ASCII(ch) NATIVE_TO_LATIN1(ch)
501#define ASCII_TO_NATIVE(ch) LATIN1_TO_NATIVE(ch)
502
503/* More or less misleadingly-named defines, retained for back compat */
504#define NATIVE_TO_UTF(ch) NATIVE_UTF8_TO_I8(ch)
505#define NATIVE_TO_I8(ch) NATIVE_UTF8_TO_I8(ch)
506#define UTF_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
507#define I8_TO_NATIVE(ch) I8_TO_NATIVE_UTF8(ch)
508#define NATIVE8_TO_UNI(ch) NATIVE_TO_LATIN1(ch)
d06134e5 509
c0236afe 510/* This defines the 1-bits that are to be in the first byte of a multi-byte
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511 * UTF-8 encoded character that mark it as a start byte and give the number of
512 * bytes that comprise the character. 'len' is the number of bytes in the
513 * multi-byte sequence. */
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514#define UTF_START_MARK(len) (((len) > 7) ? 0xFF : (0xFF & (0xFE << (7-(len)))))
515
516/* Masks out the initial one bits in a start byte, leaving the real data ones.
517 * Doesn't work on an invariant byte. 'len' is the number of bytes in the
518 * multi-byte sequence that comprises the character. */
519#define UTF_START_MASK(len) (((len) >= 7) ? 0x00 : (0x1F >> ((len)-2)))
520
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521/* Adds a UTF8 continuation byte 'new' of information to a running total code
522 * point 'old' of all the continuation bytes so far. This is designed to be
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523 * used in a loop to convert from UTF-8 to the code point represented. Note
524 * that this is asymmetric on EBCDIC platforms, in that the 'new' parameter is
525 * the UTF-EBCDIC byte, whereas the 'old' parameter is a Unicode (not EBCDIC)
526 * code point in process of being generated */
527#define UTF8_ACCUMULATE(old, new) (((old) << UTF_ACCUMULATION_SHIFT) \
528 | ((NATIVE_UTF8_TO_I8((U8)new)) \
529 & UTF_CONTINUATION_MASK))
d06134e5 530
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531/* This works in the face of malformed UTF-8. */
532#define UTF8_IS_NEXT_CHAR_DOWNGRADEABLE(s, e) (UTF8_IS_DOWNGRADEABLE_START(*s) \
533 && ( (e) - (s) > 1) \
534 && UTF8_IS_CONTINUATION(*((s)+1)))
535
5aaebcb3 536/* Number of bytes a code point occupies in UTF-8. */
5352a763 537#define NATIVE_SKIP(uv) UVCHR_SKIP(uv)
bd18bd40 538
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539/* Most code which says UNISKIP is really thinking in terms of native code
540 * points (0-255) plus all those beyond. This is an imprecise term, but having
2accb712 541 * it means existing code continues to work. For precision, use UVCHR_SKIP,
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542 * NATIVE_SKIP, or OFFUNISKIP */
543#define UNISKIP(uv) UVCHR_SKIP(uv)
5aaebcb3 544
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545/* Longer, but more accurate name */
546#define UTF8_IS_ABOVE_LATIN1_START(c) UTF8_IS_ABOVE_LATIN1(c)
547
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548/* Convert a UTF-8 variant Latin1 character to a native code point value.
549 * Needs just one iteration of accumulate. Should be used only if it is known
550 * that the code point is < 256, and is not UTF-8 invariant. Use the slower
551 * but more general TWO_BYTE_UTF8_TO_NATIVE() which handles any code point
552 * representable by two bytes (which turns out to be up through
553 * MAX_PORTABLE_UTF8_TWO_BYTE). The two parameters are:
554 * HI: a downgradable start byte;
555 * LO: continuation.
556 * */
557#define EIGHT_BIT_UTF8_TO_NATIVE(HI, LO) \
558 ( __ASSERT_(UTF8_IS_DOWNGRADEABLE_START(HI)) \
559 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
560 LATIN1_TO_NATIVE(UTF8_ACCUMULATE(( \
561 NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), (LO))))
562
94bb8c36 563/* Convert a two (not one) byte utf8 character to a native code point value.
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564 * Needs just one iteration of accumulate. Should not be used unless it is
565 * known that the two bytes are legal: 1) two-byte start, and 2) continuation.
566 * Note that the result can be larger than 255 if the input character is not
567 * downgradable */
94bb8c36 568#define TWO_BYTE_UTF8_TO_NATIVE(HI, LO) \
b18b15ad 569 ( __ASSERT_(PL_utf8skip[HI] == 2) \
635e76f5 570 __ASSERT_(UTF8_IS_CONTINUATION(LO)) \
94bb8c36 571 UNI_TO_NATIVE(UTF8_ACCUMULATE((NATIVE_UTF8_TO_I8(HI) & UTF_START_MASK(2)), \
635e76f5 572 (LO))))
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573
574/* Should never be used, and be deprecated */
575#define TWO_BYTE_UTF8_TO_UNI(HI, LO) NATIVE_TO_UNI(TWO_BYTE_UTF8_TO_NATIVE(HI, LO))
2950f2a7 576
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577/*
578
579=for apidoc Am|STRLEN|UTF8SKIP|char* s
580returns the number of bytes in the UTF-8 encoded character whose first (perhaps
581only) byte is pointed to by C<s>.
582
583=cut
584 */
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585#define UTF8SKIP(s) PL_utf8skip[*(const U8*)(s)]
586#define UTF8_SKIP(s) UTF8SKIP(s)
d06134e5 587
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588/* Most code that says 'UNI_' really means the native value for code points up
589 * through 255 */
590#define UNI_IS_INVARIANT(cp) UVCHR_IS_INVARIANT(cp)
591
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592/*
593=for apidoc Am|bool|UTF8_IS_INVARIANT|char c
594
595Evaluates to 1 if the byte C<c> represents the same character when encoded in
596UTF-8 as when not; otherwise evaluates to 0. UTF-8 invariant characters can be
597copied as-is when converting to/from UTF-8, saving time.
598
599In spite of the name, this macro gives the correct result if the input string
600from which C<c> comes is not encoded in UTF-8.
601
602See C<L</UVCHR_IS_INVARIANT>> for checking if a UV is invariant.
603
604=cut
605
606The reason it works on both UTF-8 encoded strings and non-UTF-8 encoded, is
607that it returns TRUE in each for the exact same set of bit patterns. It is
608valid on a subset of what UVCHR_IS_INVARIANT is valid on, so can just use that;
609and the compiler should optimize out anything extraneous given the
610implementation of the latter. The |0 makes sure this isn't mistakenly called
611with a ptr argument.
612*/
5c06326b 613#define UTF8_IS_INVARIANT(c) UVCHR_IS_INVARIANT((c) | 0)
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614
615/* Like the above, but its name implies a non-UTF8 input, which as the comments
616 * above show, doesn't matter as to its implementation */
38953e5a 617#define NATIVE_BYTE_IS_INVARIANT(c) UVCHR_IS_INVARIANT(c)
d06134e5 618
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619/* The macros in the next 4 sets are used to generate the two utf8 or utfebcdic
620 * bytes from an ordinal that is known to fit into exactly two (not one) bytes;
621 * it must be less than 0x3FF to work across both encodings. */
622
623/* These two are helper macros for the other three sets, and should not be used
624 * directly anywhere else. 'translate_function' is either NATIVE_TO_LATIN1
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625 * (which works for code points up through 0xFF) or NATIVE_TO_UNI which works
626 * for any code point */
48ccf5e1 627#define __BASE_TWO_BYTE_HI(c, translate_function) \
2863dafa 628 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 629 I8_TO_NATIVE_UTF8((translate_function(c) >> UTF_ACCUMULATION_SHIFT) \
2863dafa 630 | UTF_START_MARK(2)))
48ccf5e1 631#define __BASE_TWO_BYTE_LO(c, translate_function) \
2863dafa 632 (__ASSERT_(! UVCHR_IS_INVARIANT(c)) \
48ccf5e1 633 I8_TO_NATIVE_UTF8((translate_function(c) & UTF_CONTINUATION_MASK) \
2863dafa 634 | UTF_CONTINUATION_MARK))
48ccf5e1 635
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636/* The next two macros should not be used. They were designed to be usable as
637 * the case label of a switch statement, but this doesn't work for EBCDIC. Use
9d0d3a03 638 * regen/unicode_constants.pl instead */
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639#define UTF8_TWO_BYTE_HI_nocast(c) __BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)
640#define UTF8_TWO_BYTE_LO_nocast(c) __BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)
641
642/* The next two macros are used when the source should be a single byte
643 * character; checked for under DEBUGGING */
644#define UTF8_EIGHT_BIT_HI(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 645 ( __BASE_TWO_BYTE_HI(c, NATIVE_TO_LATIN1)))
48ccf5e1 646#define UTF8_EIGHT_BIT_LO(c) (__ASSERT_(FITS_IN_8_BITS(c)) \
4c8cd605 647 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_LATIN1)))
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648
649/* These final two macros in the series are used when the source can be any
650 * code point whose UTF-8 is known to occupy 2 bytes; they are less efficient
651 * than the EIGHT_BIT versions on EBCDIC platforms. We use the logical '~'
652 * operator instead of "<=" to avoid getting compiler warnings.
d52b8576 653 * MAX_UTF8_TWO_BYTE should be exactly all one bits in the lower few
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654 * places, so the ~ works */
655#define UTF8_TWO_BYTE_HI(c) \
656 (__ASSERT_((sizeof(c) == 1) \
d52b8576 657 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 658 (__BASE_TWO_BYTE_HI(c, NATIVE_TO_UNI)))
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659#define UTF8_TWO_BYTE_LO(c) \
660 (__ASSERT_((sizeof(c) == 1) \
d52b8576 661 || !(((WIDEST_UTYPE)(c)) & ~MAX_UTF8_TWO_BYTE)) \
4c8cd605 662 (__BASE_TWO_BYTE_LO(c, NATIVE_TO_UNI)))
d06134e5 663
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664/* This is illegal in any well-formed UTF-8 in both EBCDIC and ASCII
665 * as it is only in overlongs. */
666#define ILLEGAL_UTF8_BYTE I8_TO_NATIVE_UTF8(0xC1)
667
7e2040f0 668/*
e3036cf4 669 * 'UTF' is whether or not p is encoded in UTF8. The names 'foo_lazy_if' stem
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670 * from an earlier version of these macros in which they didn't call the
671 * foo_utf8() macros (i.e. were 'lazy') unless they decided that *p is the
672 * beginning of a utf8 character. Now that foo_utf8() determines that itself,
673 * no need to do it again here
7e2040f0 674 */
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675#define isIDFIRST_lazy_if(p,UTF) ((IN_BYTES || !UTF) \
676 ? isIDFIRST(*(p)) \
e3036cf4 677 : isIDFIRST_utf8((const U8*)p))
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678#define isWORDCHAR_lazy_if(p,UTF) ((IN_BYTES || (!UTF)) \
679 ? isWORDCHAR(*(p)) \
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680 : isWORDCHAR_utf8((const U8*)p))
681#define isALNUM_lazy_if(p,UTF) isWORDCHAR_lazy_if(p,UTF)
1d72bdf6 682
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683#define isIDFIRST_lazy_if_safe(p, e, UTF) \
684 ((IN_BYTES || !UTF) \
685 ? isIDFIRST(*(p)) \
686 : isIDFIRST_utf8_safe(p, e))
687
688#define isWORDCHAR_lazy_if_safe(p, e, UTF) \
689 ((IN_BYTES || !UTF) \
690 ? isWORDCHAR(*(p)) \
691 : isWORDCHAR_utf8_safe((U8 *) p, (U8 *) e))
692
693
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694#define UTF8_MAXLEN UTF8_MAXBYTES
695
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696/* A Unicode character can fold to up to 3 characters */
697#define UTF8_MAX_FOLD_CHAR_EXPAND 3
698
a98fe34d 699#define IN_BYTES (CopHINTS_get(PL_curcop) & HINT_BYTES)
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700
701/*
702
703=for apidoc Am|bool|DO_UTF8|SV* sv
704Returns a bool giving whether or not the PV in C<sv> is to be treated as being
705encoded in UTF-8.
706
707You should use this I<after> a call to C<SvPV()> or one of its variants, in
708case any call to string overloading updates the internal UTF-8 encoding flag.
709
710=cut
711*/
0064a8a9 712#define DO_UTF8(sv) (SvUTF8(sv) && !IN_BYTES)
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713
714/* Should all strings be treated as Unicode, and not just UTF-8 encoded ones?
715 * Is so within 'feature unicode_strings' or 'locale :not_characters', and not
716 * within 'use bytes'. UTF-8 locales are not tested for here, but perhaps
717 * could be */
718#define IN_UNI_8_BIT \
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719 (((CopHINTS_get(PL_curcop) & (HINT_UNI_8_BIT)) \
720 || (CopHINTS_get(PL_curcop) & HINT_LOCALE_PARTIAL \
721 /* -1 below is for :not_characters */ \
722 && _is_in_locale_category(FALSE, -1))) \
723 && ! IN_BYTES)
b36bf33f 724
1d72bdf6 725
c76687c5 726#define UTF8_ALLOW_EMPTY 0x0001 /* Allow a zero length string */
2b5e7bc2 727#define UTF8_GOT_EMPTY UTF8_ALLOW_EMPTY
c76687c5
KW
728
729/* Allow first byte to be a continuation byte */
1d72bdf6 730#define UTF8_ALLOW_CONTINUATION 0x0002
2b5e7bc2 731#define UTF8_GOT_CONTINUATION UTF8_ALLOW_CONTINUATION
c76687c5 732
2b5e7bc2 733/* Unexpected continuation byte */
1d72bdf6 734#define UTF8_ALLOW_NON_CONTINUATION 0x0004
2b5e7bc2 735#define UTF8_GOT_NON_CONTINUATION UTF8_ALLOW_NON_CONTINUATION
949cf498
KW
736
737/* expecting more bytes than were available in the string */
738#define UTF8_ALLOW_SHORT 0x0008
2b5e7bc2 739#define UTF8_GOT_SHORT UTF8_ALLOW_SHORT
949cf498 740
94953955
KW
741/* Overlong sequence; i.e., the code point can be specified in fewer bytes.
742 * First one will convert the overlong to the REPLACEMENT CHARACTER; second
743 * will return what the overlong evaluates to */
949cf498 744#define UTF8_ALLOW_LONG 0x0010
94953955 745#define UTF8_ALLOW_LONG_AND_ITS_VALUE (UTF8_ALLOW_LONG|0x0020)
2b5e7bc2
KW
746#define UTF8_GOT_LONG UTF8_ALLOW_LONG
747
d60baaa7
KW
748#define UTF8_ALLOW_OVERFLOW 0x0080
749#define UTF8_GOT_OVERFLOW UTF8_ALLOW_OVERFLOW
949cf498 750
f180b292 751#define UTF8_DISALLOW_SURROGATE 0x0100 /* Unicode surrogates */
2b5e7bc2 752#define UTF8_GOT_SURROGATE UTF8_DISALLOW_SURROGATE
f180b292 753#define UTF8_WARN_SURROGATE 0x0200
949cf498 754
f180b292 755#define UTF8_DISALLOW_NONCHAR 0x0400 /* Unicode non-character */
2b5e7bc2 756#define UTF8_GOT_NONCHAR UTF8_DISALLOW_NONCHAR
f180b292 757#define UTF8_WARN_NONCHAR 0x0800 /* code points */
949cf498 758
f180b292 759#define UTF8_DISALLOW_SUPER 0x1000 /* Super-set of Unicode: code */
2b5e7bc2 760#define UTF8_GOT_SUPER UTF8_DISALLOW_SUPER
f180b292 761#define UTF8_WARN_SUPER 0x2000 /* points above the legal max */
949cf498 762
d35f2ca5
KW
763/* Code points which never were part of the original UTF-8 standard, which only
764 * went up to 2 ** 31 - 1. Note that these all overflow a signed 32-bit word,
765 * The first byte of these code points is FE or FF on ASCII platforms. If the
766 * first byte is FF, it will overflow a 32-bit word. */
f180b292 767#define UTF8_DISALLOW_ABOVE_31_BIT 0x4000
2b5e7bc2 768#define UTF8_GOT_ABOVE_31_BIT UTF8_DISALLOW_ABOVE_31_BIT
f180b292 769#define UTF8_WARN_ABOVE_31_BIT 0x8000
d35f2ca5
KW
770
771/* For back compat, these old names are misleading for UTF_EBCDIC */
772#define UTF8_DISALLOW_FE_FF UTF8_DISALLOW_ABOVE_31_BIT
773#define UTF8_WARN_FE_FF UTF8_WARN_ABOVE_31_BIT
949cf498 774
f180b292 775#define UTF8_CHECK_ONLY 0x10000
949cf498
KW
776
777/* For backwards source compatibility. They do nothing, as the default now
778 * includes what they used to mean. The first one's meaning was to allow the
779 * just the single non-character 0xFFFF */
780#define UTF8_ALLOW_FFFF 0
781#define UTF8_ALLOW_SURROGATE 0
782
ecc1615f
KW
783/* C9 refers to Unicode Corrigendum #9: allows but discourages non-chars */
784#define UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE \
785 (UTF8_DISALLOW_SUPER|UTF8_DISALLOW_SURROGATE)
786#define UTF8_WARN_ILLEGAL_C9_INTERCHANGE (UTF8_WARN_SUPER|UTF8_WARN_SURROGATE)
787
d35f2ca5 788#define UTF8_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 789 (UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE|UTF8_DISALLOW_NONCHAR)
949cf498 790#define UTF8_WARN_ILLEGAL_INTERCHANGE \
ecc1615f
KW
791 (UTF8_WARN_ILLEGAL_C9_INTERCHANGE|UTF8_WARN_NONCHAR)
792
d60baaa7
KW
793/* This is used typically for code that is willing to accept inputs of
794 * illformed UTF-8 sequences, for whatever reason. However, all such sequences
795 * evaluate to the REPLACEMENT CHARACTER unless other flags overriding this are
796 * also present. */
2d532c27
KW
797#define UTF8_ALLOW_ANY ( UTF8_ALLOW_CONTINUATION \
798 |UTF8_ALLOW_NON_CONTINUATION \
799 |UTF8_ALLOW_SHORT \
d60baaa7
KW
800 |UTF8_ALLOW_LONG \
801 |UTF8_ALLOW_OVERFLOW)
2d532c27
KW
802
803/* Accept any Perl-extended UTF-8 that evaluates to any UV on the platform, but
804 * not any malformed. This is the default. (Note that UVs above IV_MAX are
805 * deprecated. */
806#define UTF8_ALLOW_ANYUV 0
807#define UTF8_ALLOW_DEFAULT UTF8_ALLOW_ANYUV
1d72bdf6 808
89d986df
KW
809/*
810=for apidoc Am|bool|UTF8_IS_SURROGATE|const U8 *s|const U8 *e
811
812Evaluates to non-zero if the first few bytes of the string starting at C<s> and
813looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
814of the Unicode surrogate code points; otherwise it evaluates to 0. If
815non-zero, the value gives how many bytes starting at C<s> comprise the code
816point's representation.
817
818=cut
819 */
820#define UTF8_IS_SURROGATE(s, e) is_SURROGATE_utf8_safe(s, e)
821
822
823#define UTF8_IS_REPLACEMENT(s, send) is_REPLACEMENT_utf8_safe(s,send)
824
825/*
826=for apidoc Am|bool|UTF8_IS_SUPER|const U8 *s|const U8 *e
827
828Recall that Perl recognizes an extension to UTF-8 that can encode code
829points larger than the ones defined by Unicode, which are 0..0x10FFFF.
830
831This macro evaluates to non-zero if the first few bytes of the string starting
832at C<s> and looking no further than S<C<e - 1>> are from this UTF-8 extension;
833otherwise it evaluates to 0. If non-zero, the value gives how many bytes
834starting at C<s> comprise the code point's representation.
835
8360 is returned if the bytes are not well-formed extended UTF-8, or if they
837represent a code point that cannot fit in a UV on the current platform. Hence
838this macro can give different results when run on a 64-bit word machine than on
839one with a 32-bit word size.
0c58a72b 840
89d986df
KW
841Note that it is deprecated to have code points that are larger than what can
842fit in an IV on the current machine.
7131f24d 843
89d986df
KW
844=cut
845
846 * ASCII EBCDIC I8
7131f24d
KW
847 * U+10FFFF: \xF4\x8F\xBF\xBF \xF9\xA1\xBF\xBF\xBF max legal Unicode
848 * U+110000: \xF4\x90\x80\x80 \xF9\xA2\xA0\xA0\xA0
849 * U+110001: \xF4\x90\x80\x81 \xF9\xA2\xA0\xA0\xA1
89d986df
KW
850 */
851#ifdef EBCDIC
a14e0a36 852# define UTF8_IS_SUPER(s, e) \
89d986df
KW
853 (( LIKELY((e) > (s) + 4) \
854 && NATIVE_UTF8_TO_I8(*(s)) >= 0xF9 \
855 && ( NATIVE_UTF8_TO_I8(*(s)) > 0xF9 \
3d42f267 856 || (NATIVE_UTF8_TO_I8(*((s) + 1)) >= 0xA2)) \
89d986df 857 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
2b479609 858 ? _is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
7131f24d 859#else
a14e0a36 860# define UTF8_IS_SUPER(s, e) \
89d986df
KW
861 (( LIKELY((e) > (s) + 3) \
862 && (*(U8*) (s)) >= 0xF4 \
863 && ((*(U8*) (s)) > 0xF4 || (*((U8*) (s) + 1) >= 0x90))\
864 && LIKELY((s) + UTF8SKIP(s) <= (e))) \
2b479609 865 ? _is_utf8_char_helper(s, s + UTF8SKIP(s), 0) : 0)
7131f24d
KW
866#endif
867
b96a92fb
KW
868/* These are now machine generated, and the 'given' clause is no longer
869 * applicable */
0c58a72b 870#define UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e) \
89d986df
KW
871 cBOOL(is_NONCHAR_utf8_safe(s,e))
872
873/*
874=for apidoc Am|bool|UTF8_IS_NONCHAR|const U8 *s|const U8 *e
875
876Evaluates to non-zero if the first few bytes of the string starting at C<s> and
877looking no further than S<C<e - 1>> are well-formed UTF-8 that represents one
878of the Unicode non-character code points; otherwise it evaluates to 0. If
879non-zero, the value gives how many bytes starting at C<s> comprise the code
880point's representation.
881
882=cut
883 */
0c58a72b
KW
884#define UTF8_IS_NONCHAR(s, e) \
885 UTF8_IS_NONCHAR_GIVEN_THAT_NON_SUPER_AND_GE_PROBLEMATIC(s, e)
7131f24d 886
c867b360
JH
887#define UNICODE_SURROGATE_FIRST 0xD800
888#define UNICODE_SURROGATE_LAST 0xDFFF
889#define UNICODE_REPLACEMENT 0xFFFD
890#define UNICODE_BYTE_ORDER_MARK 0xFEFF
1d72bdf6 891
b851fbc1 892/* Though our UTF-8 encoding can go beyond this,
c76687c5 893 * let's be conservative and do as Unicode says. */
b851fbc1
JH
894#define PERL_UNICODE_MAX 0x10FFFF
895
d35f2ca5
KW
896#define UNICODE_WARN_SURROGATE 0x0001 /* UTF-16 surrogates */
897#define UNICODE_WARN_NONCHAR 0x0002 /* Non-char code points */
898#define UNICODE_WARN_SUPER 0x0004 /* Above 0x10FFFF */
899#define UNICODE_WARN_ABOVE_31_BIT 0x0008 /* Above 0x7FFF_FFFF */
900#define UNICODE_DISALLOW_SURROGATE 0x0010
901#define UNICODE_DISALLOW_NONCHAR 0x0020
902#define UNICODE_DISALLOW_SUPER 0x0040
903#define UNICODE_DISALLOW_ABOVE_31_BIT 0x0080
ecc1615f
KW
904#define UNICODE_WARN_ILLEGAL_C9_INTERCHANGE \
905 (UNICODE_WARN_SURROGATE|UNICODE_WARN_SUPER)
bb88be5f 906#define UNICODE_WARN_ILLEGAL_INTERCHANGE \
ecc1615f
KW
907 (UNICODE_WARN_ILLEGAL_C9_INTERCHANGE|UNICODE_WARN_NONCHAR)
908#define UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE \
909 (UNICODE_DISALLOW_SURROGATE|UNICODE_DISALLOW_SUPER)
bb88be5f 910#define UNICODE_DISALLOW_ILLEGAL_INTERCHANGE \
ecc1615f 911 (UNICODE_DISALLOW_ILLEGAL_C9_INTERCHANGE|UNICODE_DISALLOW_NONCHAR)
949cf498
KW
912
913/* For backward source compatibility, as are now the default */
914#define UNICODE_ALLOW_SURROGATE 0
915#define UNICODE_ALLOW_SUPER 0
916#define UNICODE_ALLOW_ANY 0
b851fbc1 917
2d6b3d38
KW
918/* This matches the 2048 code points between UNICODE_SURROGATE_FIRST (0xD800) and
919 * UNICODE_SURROGATE_LAST (0xDFFF) */
920#define UNICODE_IS_SURROGATE(uv) (((UV) (uv) & (~0xFFFF | 0xF800)) \
921 == 0xD800)
922
646d1759
KW
923#define UNICODE_IS_REPLACEMENT(uv) ((UV) (uv) == UNICODE_REPLACEMENT)
924#define UNICODE_IS_BYTE_ORDER_MARK(uv) ((UV) (uv) == UNICODE_BYTE_ORDER_MARK)
c149ab20
KW
925
926/* Is 'uv' one of the 32 contiguous-range noncharacters? */
927#define UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) ((UV) (uv) >= 0xFDD0 \
928 && (UV) (uv) <= 0xFDEF)
929
930/* Is 'uv' one of the 34 plane-ending noncharacters 0xFFFE, 0xFFFF, 0x1FFFE,
931 * 0x1FFFF, ... 0x10FFFE, 0x10FFFF, given that we know that 'uv' is not above
932 * the Unicode legal max */
933#define UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv) \
934 (((UV) (uv) & 0xFFFE) == 0xFFFE)
935
936#define UNICODE_IS_NONCHAR(uv) \
937 ( UNICODE_IS_32_CONTIGUOUS_NONCHARS(uv) \
938 || ( LIKELY( ! UNICODE_IS_SUPER(uv)) \
939 && UNICODE_IS_END_PLANE_NONCHAR_GIVEN_NOT_SUPER(uv)))
940
941#define UNICODE_IS_SUPER(uv) ((UV) (uv) > PERL_UNICODE_MAX)
d35f2ca5 942#define UNICODE_IS_ABOVE_31_BIT(uv) ((UV) (uv) > 0x7FFFFFFF)
1d72bdf6 943
ec34087a
KW
944#define LATIN_SMALL_LETTER_SHARP_S LATIN_SMALL_LETTER_SHARP_S_NATIVE
945#define LATIN_SMALL_LETTER_Y_WITH_DIAERESIS \
946 LATIN_SMALL_LETTER_Y_WITH_DIAERESIS_NATIVE
947#define MICRO_SIGN MICRO_SIGN_NATIVE
948#define LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE \
949 LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE_NATIVE
950#define LATIN_SMALL_LETTER_A_WITH_RING_ABOVE \
951 LATIN_SMALL_LETTER_A_WITH_RING_ABOVE_NATIVE
09091399
JH
952#define UNICODE_GREEK_CAPITAL_LETTER_SIGMA 0x03A3
953#define UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2
954#define UNICODE_GREEK_SMALL_LETTER_SIGMA 0x03C3
9dcbe121 955#define GREEK_SMALL_LETTER_MU 0x03BC
9e682c18
KW
956#define GREEK_CAPITAL_LETTER_MU 0x039C /* Upper and title case
957 of MICRON */
958#define LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS 0x0178 /* Also is title case */
0766489e
KW
959#ifdef LATIN_CAPITAL_LETTER_SHARP_S_UTF8
960# define LATIN_CAPITAL_LETTER_SHARP_S 0x1E9E
961#endif
74894415
KW
962#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x130
963#define LATIN_SMALL_LETTER_DOTLESS_I 0x131
9e682c18 964#define LATIN_SMALL_LETTER_LONG_S 0x017F
a9f50d33
KW
965#define LATIN_SMALL_LIGATURE_LONG_S_T 0xFB05
966#define LATIN_SMALL_LIGATURE_ST 0xFB06
9e682c18
KW
967#define KELVIN_SIGN 0x212A
968#define ANGSTROM_SIGN 0x212B
09091399 969
9e55ce06 970#define UNI_DISPLAY_ISPRINT 0x0001
c728cb41
JH
971#define UNI_DISPLAY_BACKSLASH 0x0002
972#define UNI_DISPLAY_QQ (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
973#define UNI_DISPLAY_REGEX (UNI_DISPLAY_ISPRINT|UNI_DISPLAY_BACKSLASH)
9e55ce06 974
5cd46e1f
KW
975#define ANYOF_FOLD_SHARP_S(node, input, end) \
976 (ANYOF_BITMAP_TEST(node, LATIN_SMALL_LETTER_SHARP_S) && \
137165a6 977 (ANYOF_NONBITMAP(node)) && \
39065660 978 (ANYOF_FLAGS(node) & ANYOF_LOC_NONBITMAP_FOLD) && \
07b6858f 979 ((end) > (input) + 1) && \
305b8651 980 isALPHA_FOLD_EQ((input)[0], 's'))
6302f837 981
ebc501f0 982#define SHARP_S_SKIP 2
3b0fc154 983
6302f837 984/*
5dca9278
KW
985
986=for apidoc Am|STRLEN|isUTF8_CHAR|const U8 *s|const U8 *e
987
35f8c9bd 988Evaluates to non-zero if the first few bytes of the string starting at C<s> and
2c6ed66c
KW
989looking no further than S<C<e - 1>> are well-formed UTF-8, as extended by Perl,
990that represents some code point; otherwise it evaluates to 0. If non-zero, the
991value gives how many bytes starting at C<s> comprise the code point's
2717076a
KW
992representation. Any bytes remaining before C<e>, but beyond the ones needed to
993form the first code point in C<s>, are not examined.
6302f837 994
35f8c9bd
KW
995The code point can be any that will fit in a UV on this machine, using Perl's
996extension to official UTF-8 to represent those higher than the Unicode maximum
997of 0x10FFFF. That means that this macro is used to efficiently decide if the
2717076a
KW
998next few bytes in C<s> is legal UTF-8 for a single character.
999
1000Use C<L</isSTRICT_UTF8_CHAR>> to restrict the acceptable code points to those
1001defined by Unicode to be fully interchangeable across applications;
1002C<L</isC9_STRICT_UTF8_CHAR>> to use the L<Unicode Corrigendum
1003#9|http://www.unicode.org/versions/corrigendum9.html> definition of allowable
1004code points; and C<L</isUTF8_CHAR_flags>> for a more customized definition.
1005
1006Use C<L</is_utf8_string>>, C<L</is_utf8_string_loc>>, and
1007C<L</is_utf8_string_loclen>> to check entire strings.
35f8c9bd
KW
1008
1009Note that it is deprecated to use code points higher than what will fit in an
1010IV. This macro does not raise any warnings for such code points, treating them
1011as valid.
1012
1013Note also that a UTF-8 INVARIANT character (i.e. ASCII on non-EBCDIC machines)
1014is a valid UTF-8 character.
5dca9278
KW
1015
1016=cut
1017*/
6302f837 1018
784d4f31
KW
1019#define isUTF8_CHAR(s, e) \
1020 (UNLIKELY((e) <= (s)) \
1021 ? 0 \
1022 : (UTF8_IS_INVARIANT(*s)) \
df863e43
KW
1023 ? 1 \
1024 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1025 ? 0 \
1026 : LIKELY(NATIVE_UTF8_TO_I8(*s) <= _IS_UTF8_CHAR_HIGHEST_START_BYTE) \
1027 ? is_UTF8_CHAR_utf8_no_length_checks(s) \
1028 : _is_utf8_char_helper(s, e, 0))
6302f837 1029
3cedd9d9
KW
1030#define is_utf8_char_buf(buf, buf_end) isUTF8_CHAR(buf, buf_end)
1031
e23e8bc1
KW
1032/*
1033
1034=for apidoc Am|STRLEN|isSTRICT_UTF8_CHAR|const U8 *s|const U8 *e
1035
1036Evaluates to non-zero if the first few bytes of the string starting at C<s> and
1037looking no further than S<C<e - 1>> are well-formed UTF-8 that represents some
1038Unicode code point completely acceptable for open interchange between all
1039applications; otherwise it evaluates to 0. If non-zero, the value gives how
2717076a
KW
1040many bytes starting at C<s> comprise the code point's representation. Any
1041bytes remaining before C<e>, but beyond the ones needed to form the first code
1042point in C<s>, are not examined.
e23e8bc1
KW
1043
1044The largest acceptable code point is the Unicode maximum 0x10FFFF, and must not
1045be a surrogate nor a non-character code point. Thus this excludes any code
1046point from Perl's extended UTF-8.
1047
1048This is used to efficiently decide if the next few bytes in C<s> is
2717076a
KW
1049legal Unicode-acceptable UTF-8 for a single character.
1050
1051Use C<L</isC9_STRICT_UTF8_CHAR>> to use the L<Unicode Corrigendum
1052#9|http://www.unicode.org/versions/corrigendum9.html> definition of allowable
1053code points; C<L</isUTF8_CHAR>> to check for Perl's extended UTF-8;
1054and C<L</isUTF8_CHAR_flags>> for a more customized definition.
e23e8bc1 1055
9f2abfde
KW
1056Use C<L</is_strict_utf8_string>>, C<L</is_strict_utf8_string_loc>>, and
1057C<L</is_strict_utf8_string_loclen>> to check entire strings.
1058
e23e8bc1
KW
1059=cut
1060*/
1061
1062#define isSTRICT_UTF8_CHAR(s, e) \
1063 (UNLIKELY((e) <= (s)) \
1064 ? 0 \
1065 : (UTF8_IS_INVARIANT(*s)) \
1066 ? 1 \
1067 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1068 ? 0 \
1069 : is_STRICT_UTF8_CHAR_utf8_no_length_checks(s))
1070
a82be82b
KW
1071/*
1072
1073=for apidoc Am|STRLEN|isC9_STRICT_UTF8_CHAR|const U8 *s|const U8 *e
1074
1075Evaluates to non-zero if the first few bytes of the string starting at C<s> and
1076looking no further than S<C<e - 1>> are well-formed UTF-8 that represents some
1077Unicode non-surrogate code point; otherwise it evaluates to 0. If non-zero,
1078the value gives how many bytes starting at C<s> comprise the code point's
2717076a
KW
1079representation. Any bytes remaining before C<e>, but beyond the ones needed to
1080form the first code point in C<s>, are not examined.
a82be82b
KW
1081
1082The largest acceptable code point is the Unicode maximum 0x10FFFF. This
1083differs from C<L</isSTRICT_UTF8_CHAR>> only in that it accepts non-character
1084code points. This corresponds to
1085L<Unicode Corrigendum #9|http://www.unicode.org/versions/corrigendum9.html>.
1086which said that non-character code points are merely discouraged rather than
1087completely forbidden in open interchange. See
1088L<perlunicode/Noncharacter code points>.
1089
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KW
1090Use C<L</isUTF8_CHAR>> to check for Perl's extended UTF-8; and
1091C<L</isUTF8_CHAR_flags>> for a more customized definition.
1092
9f2abfde
KW
1093Use C<L</is_c9strict_utf8_string>>, C<L</is_c9strict_utf8_string_loc>>, and
1094C<L</is_c9strict_utf8_string_loclen>> to check entire strings.
1095
a82be82b
KW
1096=cut
1097*/
1098
1099#define isC9_STRICT_UTF8_CHAR(s, e) \
1100 (UNLIKELY((e) <= (s)) \
1101 ? 0 \
1102 : (UTF8_IS_INVARIANT(*s)) \
1103 ? 1 \
1104 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1105 ? 0 \
1106 : is_C9_STRICT_UTF8_CHAR_utf8_no_length_checks(s))
1107
25e3a4e0
KW
1108/*
1109
1110=for apidoc Am|STRLEN|isUTF8_CHAR_flags|const U8 *s|const U8 *e| const U32 flags
1111
1112Evaluates to non-zero if the first few bytes of the string starting at C<s> and
1113looking no further than S<C<e - 1>> are well-formed UTF-8, as extended by Perl,
1114that represents some code point, subject to the restrictions given by C<flags>;
1115otherwise it evaluates to 0. If non-zero, the value gives how many bytes
2717076a
KW
1116starting at C<s> comprise the code point's representation. Any bytes remaining
1117before C<e>, but beyond the ones needed to form the first code point in C<s>,
1118are not examined.
25e3a4e0
KW
1119
1120If C<flags> is 0, this gives the same results as C<L</isUTF8_CHAR>>;
1121if C<flags> is C<UTF8_DISALLOW_ILLEGAL_INTERCHANGE>, this gives the same results
1122as C<L</isSTRICT_UTF8_CHAR>>;
1123and if C<flags> is C<UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE>, this gives
1124the same results as C<L</isC9_STRICT_UTF8_CHAR>>.
1125Otherwise C<flags> may be any combination of the C<UTF8_DISALLOW_I<foo>> flags
1126understood by C<L</utf8n_to_uvchr>>, with the same meanings.
1127
1128The three alternative macros are for the most commonly needed validations; they
1129are likely to run somewhat faster than this more general one, as they can be
1130inlined into your code.
1131
9f2abfde
KW
1132Use L</is_utf8_string_flags>, L</is_utf8_string_loc_flags>, and
1133L</is_utf8_string_loclen_flags> to check entire strings.
1134
25e3a4e0
KW
1135=cut
1136*/
1137
1138#define isUTF8_CHAR_flags(s, e, flags) \
1139 (UNLIKELY((e) <= (s)) \
1140 ? 0 \
1141 : (UTF8_IS_INVARIANT(*s)) \
1142 ? 1 \
1143 : UNLIKELY(((e) - (s)) < UTF8SKIP(s)) \
1144 ? 0 \
1145 : _is_utf8_char_helper(s, e, flags))
1146
6302f837
KW
1147/* Do not use; should be deprecated. Use isUTF8_CHAR() instead; this is
1148 * retained solely for backwards compatibility */
1149#define IS_UTF8_CHAR(p, n) (isUTF8_CHAR(p, (p) + (n)) == n)
e9a8c099 1150
57f0e7e2
KW
1151#endif /* H_UTF8 */
1152
e9a8c099 1153/*
14d04a33 1154 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 1155 */