xref: /PHP-7.2/ext/pcre/pcrelib/pcre_xclass.c (revision 8a287c0e)
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 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48 
49 #include "pcre_internal.h"
50 
51 
52 /*************************************************
53 *       Match character against an XCLASS        *
54 *************************************************/
55 
56 /* This function is called to match a character against an extended class that
57 might contain values > 255 and/or Unicode properties.
58 
59 Arguments:
60   c           the character
61   data        points to the flag byte of the XCLASS data
62 
63 Returns:      TRUE if character matches, else FALSE
64 */
65 
66 BOOL
PRIV(xclass)67 PRIV(xclass)(pcre_uint32 c, const pcre_uchar *data, BOOL utf)
68 {
69 pcre_uchar t;
70 BOOL negated = (*data & XCL_NOT) != 0;
71 
72 (void)utf;
73 #ifdef COMPILE_PCRE8
74 /* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
75 utf = TRUE;
76 #endif
77 
78 /* Character values < 256 are matched against a bitmap, if one is present. If
79 not, we still carry on, because there may be ranges that start below 256 in the
80 additional data. */
81 
82 if (c < 256)
83   {
84   if ((*data & XCL_HASPROP) == 0)
85     {
86     if ((*data & XCL_MAP) == 0) return negated;
87     return (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0;
88     }
89   if ((*data & XCL_MAP) != 0 &&
90     (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
91     return !negated; /* char found */
92   }
93 
94 /* First skip the bit map if present. Then match against the list of Unicode
95 properties or large chars or ranges that end with a large char. We won't ever
96 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
97 
98 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
99 
100 while ((t = *data++) != XCL_END)
101   {
102   pcre_uint32 x, y;
103   if (t == XCL_SINGLE)
104     {
105 #ifdef SUPPORT_UTF
106     if (utf)
107       {
108       GETCHARINC(x, data); /* macro generates multiple statements */
109       }
110     else
111 #endif
112       x = *data++;
113     if (c == x) return !negated;
114     }
115   else if (t == XCL_RANGE)
116     {
117 #ifdef SUPPORT_UTF
118     if (utf)
119       {
120       GETCHARINC(x, data); /* macro generates multiple statements */
121       GETCHARINC(y, data); /* macro generates multiple statements */
122       }
123     else
124 #endif
125       {
126       x = *data++;
127       y = *data++;
128       }
129     if (c >= x && c <= y) return !negated;
130     }
131 
132 #ifdef SUPPORT_UCP
133   else  /* XCL_PROP & XCL_NOTPROP */
134     {
135     const ucd_record *prop = GET_UCD(c);
136     BOOL isprop = t == XCL_PROP;
137 
138     switch(*data)
139       {
140       case PT_ANY:
141       if (isprop) return !negated;
142       break;
143 
144       case PT_LAMP:
145       if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
146            prop->chartype == ucp_Lt) == isprop) return !negated;
147       break;
148 
149       case PT_GC:
150       if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
151         return !negated;
152       break;
153 
154       case PT_PC:
155       if ((data[1] == prop->chartype) == isprop) return !negated;
156       break;
157 
158       case PT_SC:
159       if ((data[1] == prop->script) == isprop) return !negated;
160       break;
161 
162       case PT_ALNUM:
163       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
164            PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
165         return !negated;
166       break;
167 
168       /* Perl space used to exclude VT, but from Perl 5.18 it is included,
169       which means that Perl space and POSIX space are now identical. PCRE
170       was changed at release 8.34. */
171 
172       case PT_SPACE:    /* Perl space */
173       case PT_PXSPACE:  /* POSIX space */
174       switch(c)
175         {
176         HSPACE_CASES:
177         VSPACE_CASES:
178         if (isprop) return !negated;
179         break;
180 
181         default:
182         if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
183           return !negated;
184         break;
185         }
186       break;
187 
188       case PT_WORD:
189       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
190            PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
191              == isprop)
192         return !negated;
193       break;
194 
195       case PT_UCNC:
196       if (c < 0xa0)
197         {
198         if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
199              c == CHAR_GRAVE_ACCENT) == isprop)
200           return !negated;
201         }
202       else
203         {
204         if ((c < 0xd800 || c > 0xdfff) == isprop)
205           return !negated;
206         }
207       break;
208 
209       /* The following three properties can occur only in an XCLASS, as there
210       is no \p or \P coding for them. */
211 
212       /* Graphic character. Implement this as not Z (space or separator) and
213       not C (other), except for Cf (format) with a few exceptions. This seems
214       to be what Perl does. The exceptional characters are:
215 
216       U+061C           Arabic Letter Mark
217       U+180E           Mongolian Vowel Separator
218       U+2066 - U+2069  Various "isolate"s
219       */
220 
221       case PT_PXGRAPH:
222       if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
223             (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
224               (prop->chartype == ucp_Cf &&
225                 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
226          )) == isprop)
227         return !negated;
228       break;
229 
230       /* Printable character: same as graphic, with the addition of Zs, i.e.
231       not Zl and not Zp, and U+180E. */
232 
233       case PT_PXPRINT:
234       if ((prop->chartype != ucp_Zl &&
235            prop->chartype != ucp_Zp &&
236             (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
237               (prop->chartype == ucp_Cf &&
238                 c != 0x061c && (c < 0x2066 || c > 0x2069))
239          )) == isprop)
240         return !negated;
241       break;
242 
243       /* Punctuation: all Unicode punctuation, plus ASCII characters that
244       Unicode treats as symbols rather than punctuation, for Perl
245       compatibility (these are $+<=>^`|~). */
246 
247       case PT_PXPUNCT:
248       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
249             (c < 128 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
250         return !negated;
251       break;
252 
253       /* This should never occur, but compilers may mutter if there is no
254       default. */
255 
256       default:
257       return FALSE;
258       }
259 
260     data += 2;
261     }
262 #endif  /* SUPPORT_UCP */
263   }
264 
265 return negated;   /* char did not match */
266 }
267 
268 /* End of pcre_xclass.c */
269