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