/[pcre]/code/trunk/pcre_xclass.c
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Contents of /code/trunk/pcre_xclass.c

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Revision 87 - (show annotations) (download)
Sat Feb 24 21:41:21 2007 UTC (7 years, 4 months ago) by nigel
File MIME type: text/plain
File size: 4607 byte(s)
Load pcre-6.5 into code/trunk.

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) 1997-2006 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 (one that contains characters whose values are > 255). It is used by both
43 pcre_exec() and pcre_def_exec(). */
44
45
46 #include "pcre_internal.h"
47
48
49 /*************************************************
50 * Match character against an XCLASS *
51 *************************************************/
52
53 /* This function is called to match a character against an extended class that
54 might contain values > 255.
55
56 Arguments:
57 c the character
58 data points to the flag byte of the XCLASS data
59
60 Returns: TRUE if character matches, else FALSE
61 */
62
63 BOOL
64 _pcre_xclass(int c, const uschar *data)
65 {
66 int t;
67 BOOL negated = (*data & XCL_NOT) != 0;
68
69 /* Character values < 256 are matched against a bitmap, if one is present. If
70 not, we still carry on, because there may be ranges that start below 256 in the
71 additional data. */
72
73 if (c < 256)
74 {
75 if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
76 return !negated; /* char found */
77 }
78
79 /* First skip the bit map if present. Then match against the list of Unicode
80 properties or large chars or ranges that end with a large char. We won't ever
81 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
82
83 if ((*data++ & XCL_MAP) != 0) data += 32;
84
85 while ((t = *data++) != XCL_END)
86 {
87 int x, y;
88 if (t == XCL_SINGLE)
89 {
90 GETCHARINC(x, data);
91 if (c == x) return !negated;
92 }
93 else if (t == XCL_RANGE)
94 {
95 GETCHARINC(x, data);
96 GETCHARINC(y, data);
97 if (c >= x && c <= y) return !negated;
98 }
99
100 #ifdef SUPPORT_UCP
101 else /* XCL_PROP & XCL_NOTPROP */
102 {
103 int chartype, script;
104 int category = _pcre_ucp_findprop(c, &chartype, &script);
105
106 switch(*data)
107 {
108 case PT_ANY:
109 if (t == XCL_PROP) return !negated;
110 break;
111
112 case PT_LAMP:
113 if ((chartype == ucp_Lu || chartype == ucp_Ll || chartype == ucp_Lt) ==
114 (t == XCL_PROP)) return !negated;
115 break;
116
117 case PT_GC:
118 if ((data[1] == category) == (t == XCL_PROP)) return !negated;
119 break;
120
121 case PT_PC:
122 if ((data[1] == chartype) == (t == XCL_PROP)) return !negated;
123 break;
124
125 case PT_SC:
126 if ((data[1] == script) == (t == XCL_PROP)) return !negated;
127 break;
128
129 /* This should never occur, but compilers may mutter if there is no
130 default. */
131
132 default:
133 return FALSE;
134 }
135
136 data += 2;
137 }
138 #endif /* SUPPORT_UCP */
139 }
140
141 return negated; /* char did not match */
142 }
143
144 /* End of pcre_xclass.c */

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