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

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Revision 117 - (hide annotations) (download)
Fri Mar 9 15:59:06 2007 UTC (7 years, 9 months ago) by ph10
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Update copyright years to 2007.

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 ph10 117 Copyright (c) 1997-2007 University of Cambridge
10 nigel 77
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 nigel 87 BOOL
64 nigel 77 _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 nigel 87 int chartype, script;
104     int category = _pcre_ucp_findprop(c, &chartype, &script);
105    
106     switch(*data)
107 nigel 77 {
108 nigel 87 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 nigel 77 }
135 nigel 87
136     data += 2;
137 nigel 77 }
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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