1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Original API code Copyright (c) 1997-2012 University of Cambridge
10 New API code Copyright (c) 2016-2022 University of Cambridge
11
12 -----------------------------------------------------------------------------
13 Redistribution and use in source and binary forms, with or without
14 modification, are permitted provided that the following conditions are met:
15
16 * Redistributions of source code must retain the above copyright notice,
17 this list of conditions and the following disclaimer.
18
19 * Redistributions in binary form must reproduce the above copyright
20 notice, this list of conditions and the following disclaimer in the
21 documentation and/or other materials provided with the distribution.
22
23 * Neither the name of the University of Cambridge nor the names of its
24 contributors may be used to endorse or promote products derived from
25 this software without specific prior written permission.
26
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 POSSIBILITY OF SUCH DAMAGE.
38 -----------------------------------------------------------------------------
39 */
40
41 /* This module contains an internal function that is used to match an extended
42 class. It is used by pcre2_auto_possessify() and by both pcre2_match() and
43 pcre2_def_match(). */
44
45
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49
50
51 #include "pcre2_internal.h"
52
53 /*************************************************
54 * Match character against an XCLASS *
55 *************************************************/
56
57 /* This function is called to match a character against an extended class that
58 might contain codepoints above 255 and/or Unicode properties.
59
60 Arguments:
61 c the character
62 data points to the flag code unit of the XCLASS data
63 utf TRUE if in UTF mode
64
65 Returns: TRUE if character matches, else FALSE
66 */
67
68 BOOL
PRIV(xclass)69 PRIV(xclass)(uint32_t c, PCRE2_SPTR data, BOOL utf)
70 {
71 PCRE2_UCHAR t;
72 BOOL negated = (*data & XCL_NOT) != 0;
73
74 #if PCRE2_CODE_UNIT_WIDTH == 8
75 /* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
76 utf = TRUE;
77 #endif
78
79 /* Code points < 256 are matched against a bitmap, if one is present. If not,
80 we still carry on, because there may be ranges that start below 256 in the
81 additional data. */
82
83 if (c < 256)
84 {
85 if ((*data & XCL_HASPROP) == 0)
86 {
87 if ((*data & XCL_MAP) == 0) return negated;
88 return (((uint8_t *)(data + 1))[c/8] & (1u << (c&7))) != 0;
89 }
90 if ((*data & XCL_MAP) != 0 &&
91 (((uint8_t *)(data + 1))[c/8] & (1u << (c&7))) != 0)
92 return !negated; /* char found */
93 }
94
95 /* First skip the bit map if present. Then match against the list of Unicode
96 properties or large chars or ranges that end with a large char. We won't ever
97 encounter XCL_PROP or XCL_NOTPROP when UTF support is not compiled. */
98
99 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(PCRE2_UCHAR);
100
101 while ((t = *data++) != XCL_END)
102 {
103 uint32_t x, y;
104 if (t == XCL_SINGLE)
105 {
106 #ifdef SUPPORT_UNICODE
107 if (utf)
108 {
109 GETCHARINC(x, data); /* macro generates multiple statements */
110 }
111 else
112 #endif
113 x = *data++;
114 if (c == x) return !negated;
115 }
116 else if (t == XCL_RANGE)
117 {
118 #ifdef SUPPORT_UNICODE
119 if (utf)
120 {
121 GETCHARINC(x, data); /* macro generates multiple statements */
122 GETCHARINC(y, data); /* macro generates multiple statements */
123 }
124 else
125 #endif
126 {
127 x = *data++;
128 y = *data++;
129 }
130 if (c >= x && c <= y) return !negated;
131 }
132
133 #ifdef SUPPORT_UNICODE
134 else /* XCL_PROP & XCL_NOTPROP */
135 {
136 const ucd_record *prop = GET_UCD(c);
137 BOOL isprop = t == XCL_PROP;
138 BOOL ok;
139
140 switch(*data)
141 {
142 case PT_ANY:
143 if (isprop) return !negated;
144 break;
145
146 case PT_LAMP:
147 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
148 prop->chartype == ucp_Lt) == isprop) return !negated;
149 break;
150
151 case PT_GC:
152 if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
153 return !negated;
154 break;
155
156 case PT_PC:
157 if ((data[1] == prop->chartype) == isprop) return !negated;
158 break;
159
160 case PT_SC:
161 if ((data[1] == prop->script) == isprop) return !negated;
162 break;
163
164 case PT_SCX:
165 ok = (data[1] == prop->script ||
166 MAPBIT(PRIV(ucd_script_sets) + UCD_SCRIPTX_PROP(prop), data[1]) != 0);
167 if (ok == isprop) return !negated;
168 break;
169
170 case PT_ALNUM:
171 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
172 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
173 return !negated;
174 break;
175
176 /* Perl space used to exclude VT, but from Perl 5.18 it is included,
177 which means that Perl space and POSIX space are now identical. PCRE
178 was changed at release 8.34. */
179
180 case PT_SPACE: /* Perl space */
181 case PT_PXSPACE: /* POSIX space */
182 switch(c)
183 {
184 HSPACE_CASES:
185 VSPACE_CASES:
186 if (isprop) return !negated;
187 break;
188
189 default:
190 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
191 return !negated;
192 break;
193 }
194 break;
195
196 case PT_WORD:
197 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
198 PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
199 == isprop)
200 return !negated;
201 break;
202
203 case PT_UCNC:
204 if (c < 0xa0)
205 {
206 if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
207 c == CHAR_GRAVE_ACCENT) == isprop)
208 return !negated;
209 }
210 else
211 {
212 if ((c < 0xd800 || c > 0xdfff) == isprop)
213 return !negated;
214 }
215 break;
216
217 case PT_BIDICL:
218 if ((UCD_BIDICLASS_PROP(prop) == data[1]) == isprop)
219 return !negated;
220 break;
221
222 case PT_BOOL:
223 ok = MAPBIT(PRIV(ucd_boolprop_sets) +
224 UCD_BPROPS_PROP(prop), data[1]) != 0;
225 if (ok == isprop) return !negated;
226 break;
227
228 /* The following three properties can occur only in an XCLASS, as there
229 is no \p or \P coding for them. */
230
231 /* Graphic character. Implement this as not Z (space or separator) and
232 not C (other), except for Cf (format) with a few exceptions. This seems
233 to be what Perl does. The exceptional characters are:
234
235 U+061C Arabic Letter Mark
236 U+180E Mongolian Vowel Separator
237 U+2066 - U+2069 Various "isolate"s
238 */
239
240 case PT_PXGRAPH:
241 if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
242 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
243 (prop->chartype == ucp_Cf &&
244 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
245 )) == isprop)
246 return !negated;
247 break;
248
249 /* Printable character: same as graphic, with the addition of Zs, i.e.
250 not Zl and not Zp, and U+180E. */
251
252 case PT_PXPRINT:
253 if ((prop->chartype != ucp_Zl &&
254 prop->chartype != ucp_Zp &&
255 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
256 (prop->chartype == ucp_Cf &&
257 c != 0x061c && (c < 0x2066 || c > 0x2069))
258 )) == isprop)
259 return !negated;
260 break;
261
262 /* Punctuation: all Unicode punctuation, plus ASCII characters that
263 Unicode treats as symbols rather than punctuation, for Perl
264 compatibility (these are $+<=>^`|~). */
265
266 case PT_PXPUNCT:
267 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
268 (c < 128 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
269 return !negated;
270 break;
271
272 /* This should never occur, but compilers may mutter if there is no
273 default. */
274
275 default:
276 return FALSE;
277 }
278
279 data += 2;
280 }
281 #else
282 (void)utf; /* Avoid compiler warning */
283 #endif /* SUPPORT_UNICODE */
284 }
285
286 return negated; /* char did not match */
287 }
288
289 /* End of pcre2_xclass.c */
290
