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) 2016-2019 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
139 switch(*data)
140 {
141 case PT_ANY:
142 if (isprop) return !negated;
143 break;
144
145 case PT_LAMP:
146 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
147 prop->chartype == ucp_Lt) == isprop) return !negated;
148 break;
149
150 case PT_GC:
151 if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
152 return !negated;
153 break;
154
155 case PT_PC:
156 if ((data[1] == prop->chartype) == isprop) return !negated;
157 break;
158
159 case PT_SC:
160 if ((data[1] == prop->script) == isprop) return !negated;
161 break;
162
163 case PT_ALNUM:
164 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
165 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
166 return !negated;
167 break;
168
169 /* Perl space used to exclude VT, but from Perl 5.18 it is included,
170 which means that Perl space and POSIX space are now identical. PCRE
171 was changed at release 8.34. */
172
173 case PT_SPACE: /* Perl space */
174 case PT_PXSPACE: /* POSIX space */
175 switch(c)
176 {
177 HSPACE_CASES:
178 VSPACE_CASES:
179 if (isprop) return !negated;
180 break;
181
182 default:
183 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
184 return !negated;
185 break;
186 }
187 break;
188
189 case PT_WORD:
190 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
191 PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
192 == isprop)
193 return !negated;
194 break;
195
196 case PT_UCNC:
197 if (c < 0xa0)
198 {
199 if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
200 c == CHAR_GRAVE_ACCENT) == isprop)
201 return !negated;
202 }
203 else
204 {
205 if ((c < 0xd800 || c > 0xdfff) == isprop)
206 return !negated;
207 }
208 break;
209
210 /* The following three properties can occur only in an XCLASS, as there
211 is no \p or \P coding for them. */
212
213 /* Graphic character. Implement this as not Z (space or separator) and
214 not C (other), except for Cf (format) with a few exceptions. This seems
215 to be what Perl does. The exceptional characters are:
216
217 U+061C Arabic Letter Mark
218 U+180E Mongolian Vowel Separator
219 U+2066 - U+2069 Various "isolate"s
220 */
221
222 case PT_PXGRAPH:
223 if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
224 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
225 (prop->chartype == ucp_Cf &&
226 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
227 )) == isprop)
228 return !negated;
229 break;
230
231 /* Printable character: same as graphic, with the addition of Zs, i.e.
232 not Zl and not Zp, and U+180E. */
233
234 case PT_PXPRINT:
235 if ((prop->chartype != ucp_Zl &&
236 prop->chartype != ucp_Zp &&
237 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
238 (prop->chartype == ucp_Cf &&
239 c != 0x061c && (c < 0x2066 || c > 0x2069))
240 )) == isprop)
241 return !negated;
242 break;
243
244 /* Punctuation: all Unicode punctuation, plus ASCII characters that
245 Unicode treats as symbols rather than punctuation, for Perl
246 compatibility (these are $+<=>^`|~). */
247
248 case PT_PXPUNCT:
249 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
250 (c < 128 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
251 return !negated;
252 break;
253
254 /* This should never occur, but compilers may mutter if there is no
255 default. */
256
257 default:
258 return FALSE;
259 }
260
261 data += 2;
262 }
263 #else
264 (void)utf; /* Avoid compiler warning */
265 #endif /* SUPPORT_UNICODE */
266 }
267
268 return negated; /* char did not match */
269 }
270
271 /* End of pcre2_xclass.c */
272