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

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Revision 77 - (hide annotations) (download)
Sat Feb 24 21:40:45 2007 UTC (7 years, 2 months ago) by nigel
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File size: 4139 byte(s)
Load pcre-6.0 into code/trunk.

1 nigel 77 /*************************************************
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) 1997-2005 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     EXPORT 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, othercase;
104     int rqdtype = *data++;
105     int category = ucp_findchar(c, &chartype, &othercase);
106     if (rqdtype >= 128)
107     {
108     if ((rqdtype - 128 == category) == (t == XCL_PROP)) return !negated;
109     }
110     else
111     {
112     if ((rqdtype == chartype) == (t == XCL_PROP)) return !negated;
113     }
114     }
115     #endif /* SUPPORT_UCP */
116     }
117    
118     return negated; /* char did not match */
119     }
120    
121     /* End of pcre_xclass.c */

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