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) 1997-2012 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)(int c, const pcre_uchar *data, BOOL utf)
66 {
67 int 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_MAP) != 0 &&
83 (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
84 return !negated; /* char found */
85 }
86
87 /* First skip the bit map if present. Then match against the list of Unicode
88 properties or large chars or ranges that end with a large char. We won't ever
89 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
90
91 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
92
93 while ((t = *data++) != XCL_END)
94 {
95 int x, y;
96 if (t == XCL_SINGLE)
97 {
98 #ifdef SUPPORT_UTF
99 if (utf)
100 {
101 GETCHARINC(x, data); /* macro generates multiple statements */
102 }
103 else
104 #endif
105 x = *data++;
106 if (c == x) return !negated;
107 }
108 else if (t == XCL_RANGE)
109 {
110 #ifdef SUPPORT_UTF
111 if (utf)
112 {
113 GETCHARINC(x, data); /* macro generates multiple statements */
114 GETCHARINC(y, data); /* macro generates multiple statements */
115 }
116 else
117 #endif
118 {
119 x = *data++;
120 y = *data++;
121 }
122 if (c >= x && c <= y) return !negated;
123 }
124
125 #ifdef SUPPORT_UCP
126 else /* XCL_PROP & XCL_NOTPROP */
127 {
128 const pcre_uint8 chartype = UCD_CHARTYPE(c);
129
130 switch(*data)
131 {
132 case PT_ANY:
133 if (t == XCL_PROP) return !negated;
134 break;
135
136 case PT_LAMP:
137 if ((chartype == ucp_Lu || chartype == ucp_Ll ||
138 chartype == ucp_Lt) == (t == XCL_PROP)) return !negated;
139 break;
140
141 case PT_GC:
142 if ((data[1] == PRIV(ucp_gentype)[chartype]) == (t == XCL_PROP))
143 return !negated;
144 break;
145
146 case PT_PC:
147 if ((data[1] == chartype) == (t == XCL_PROP)) return !negated;
148 break;
149
150 case PT_SC:
151 if ((data[1] == UCD_SCRIPT(c)) == (t == XCL_PROP)) return !negated;
152 break;
153
154 case PT_ALNUM:
155 if ((PRIV(ucp_gentype)[chartype] == ucp_L ||
156 PRIV(ucp_gentype)[chartype] == ucp_N) == (t == XCL_PROP))
157 return !negated;
158 break;
159
160 case PT_SPACE: /* Perl space */
161 if ((PRIV(ucp_gentype)[chartype] == ucp_Z ||
162 c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
163 == (t == XCL_PROP))
164 return !negated;
165 break;
166
167 case PT_PXSPACE: /* POSIX space */
168 if ((PRIV(ucp_gentype)[chartype] == ucp_Z ||
169 c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
170 c == CHAR_FF || c == CHAR_CR) == (t == XCL_PROP))
171 return !negated;
172 break;
173
174 case PT_WORD:
175 if ((PRIV(ucp_gentype)[chartype] == ucp_L ||
176 PRIV(ucp_gentype)[chartype] == ucp_N || c == CHAR_UNDERSCORE)
177 == (t == XCL_PROP))
178 return !negated;
179 break;
180
181 /* This should never occur, but compilers may mutter if there is no
182 default. */
183
184 default:
185 return FALSE;
186 }
187
188 data += 2;
189 }
190 #endif /* SUPPORT_UCP */
191 }
192
193 return negated; /* char did not match */
194 }
195
196 /* End of pcre_xclass.c */
197