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 Copyright (c) 1997-2013 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module contains an internal function that is used to match an extended
42 class. It is used by both pcre_exec() and pcre_def_exec(). */
43
44
45 #include "config.h"
46
47 #include "pcre_internal.h"
48
49
50 /*************************************************
51 * Match character against an XCLASS *
52 *************************************************/
53
54 /* This function is called to match a character against an extended class that
55 might contain values > 255 and/or Unicode properties.
56
57 Arguments:
58 c the character
59 data points to the flag byte of the XCLASS data
60
61 Returns: TRUE if character matches, else FALSE
62 */
63
64 BOOL
PRIV(xclass)65 PRIV(xclass)(pcre_uint32 c, const pcre_uchar *data, BOOL utf)
66 {
67 pcre_uchar t;
68 BOOL negated = (*data & XCL_NOT) != 0;
69
70 (void)utf;
71 #ifdef COMPILE_PCRE8
72 /* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
73 utf = TRUE;
74 #endif
75
76 /* Character values < 256 are matched against a bitmap, if one is present. If
77 not, we still carry on, because there may be ranges that start below 256 in the
78 additional data. */
79
80 if (c < 256)
81 {
82 if ((*data & XCL_HASPROP) == 0)
83 {
84 if ((*data & XCL_MAP) == 0) return negated;
85 return (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0;
86 }
87 if ((*data & XCL_MAP) != 0 &&
88 (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
89 return !negated; /* char found */
90 }
91
92 /* First skip the bit map if present. Then match against the list of Unicode
93 properties or large chars or ranges that end with a large char. We won't ever
94 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
95
96 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
97
98 while ((t = *data++) != XCL_END)
99 {
100 pcre_uint32 x, y;
101 if (t == XCL_SINGLE)
102 {
103 #ifdef SUPPORT_UTF
104 if (utf)
105 {
106 GETCHARINC(x, data); /* macro generates multiple statements */
107 }
108 else
109 #endif
110 x = *data++;
111 if (c == x) return !negated;
112 }
113 else if (t == XCL_RANGE)
114 {
115 #ifdef SUPPORT_UTF
116 if (utf)
117 {
118 GETCHARINC(x, data); /* macro generates multiple statements */
119 GETCHARINC(y, data); /* macro generates multiple statements */
120 }
121 else
122 #endif
123 {
124 x = *data++;
125 y = *data++;
126 }
127 if (c >= x && c <= y) return !negated;
128 }
129
130 #ifdef SUPPORT_UCP
131 else /* XCL_PROP & XCL_NOTPROP */
132 {
133 const ucd_record *prop = GET_UCD(c);
134 BOOL isprop = t == XCL_PROP;
135
136 switch(*data)
137 {
138 case PT_ANY:
139 if (isprop) return !negated;
140 break;
141
142 case PT_LAMP:
143 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
144 prop->chartype == ucp_Lt) == isprop) return !negated;
145 break;
146
147 case PT_GC:
148 if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
149 return !negated;
150 break;
151
152 case PT_PC:
153 if ((data[1] == prop->chartype) == isprop) return !negated;
154 break;
155
156 case PT_SC:
157 if ((data[1] == prop->script) == isprop) return !negated;
158 break;
159
160 case PT_ALNUM:
161 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
162 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
163 return !negated;
164 break;
165
166 /* Perl space used to exclude VT, but from Perl 5.18 it is included,
167 which means that Perl space and POSIX space are now identical. PCRE
168 was changed at release 8.34. */
169
170 case PT_SPACE: /* Perl space */
171 case PT_PXSPACE: /* POSIX space */
172 switch(c)
173 {
174 HSPACE_CASES:
175 VSPACE_CASES:
176 if (isprop) return !negated;
177 break;
178
179 default:
180 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
181 return !negated;
182 break;
183 }
184 break;
185
186 case PT_WORD:
187 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
188 PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
189 == isprop)
190 return !negated;
191 break;
192
193 case PT_UCNC:
194 if (c < 0xa0)
195 {
196 if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
197 c == CHAR_GRAVE_ACCENT) == isprop)
198 return !negated;
199 }
200 else
201 {
202 if ((c < 0xd800 || c > 0xdfff) == isprop)
203 return !negated;
204 }
205 break;
206
207 /* The following three properties can occur only in an XCLASS, as there
208 is no \p or \P coding for them. */
209
210 /* Graphic character. Implement this as not Z (space or separator) and
211 not C (other), except for Cf (format) with a few exceptions. This seems
212 to be what Perl does. The exceptional characters are:
213
214 U+061C Arabic Letter Mark
215 U+180E Mongolian Vowel Separator
216 U+2066 - U+2069 Various "isolate"s
217 */
218
219 case PT_PXGRAPH:
220 if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
221 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
222 (prop->chartype == ucp_Cf &&
223 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
224 )) == isprop)
225 return !negated;
226 break;
227
228 /* Printable character: same as graphic, with the addition of Zs, i.e.
229 not Zl and not Zp, and U+180E. */
230
231 case PT_PXPRINT:
232 if ((prop->chartype != ucp_Zl &&
233 prop->chartype != ucp_Zp &&
234 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
235 (prop->chartype == ucp_Cf &&
236 c != 0x061c && (c < 0x2066 || c > 0x2069))
237 )) == isprop)
238 return !negated;
239 break;
240
241 /* Punctuation: all Unicode punctuation, plus ASCII characters that
242 Unicode treats as symbols rather than punctuation, for Perl
243 compatibility (these are $+<=>^`|~). */
244
245 case PT_PXPUNCT:
246 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
247 (c < 128 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
248 return !negated;
249 break;
250
251 /* This should never occur, but compilers may mutter if there is no
252 default. */
253
254 default:
255 return FALSE;
256 }
257
258 data += 2;
259 }
260 #endif /* SUPPORT_UCP */
261 }
262
263 return negated; /* char did not match */
264 }
265
266 /* End of pcre_xclass.c */
267
