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

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Revision 236 - (hide annotations) (download)
Tue Sep 11 12:57:06 2007 UTC (7 years, 2 months ago) by ph10
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<config.h> => "config.h" and also some cases of <pcre.h>.

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 ph10 200 #ifdef HAVE_CONFIG_H
47 ph10 236 #include "config.h"
48 ph10 200 #endif
49 ph10 199
50 nigel 77 #include "pcre_internal.h"
51    
52    
53     /*************************************************
54     * Match character against an XCLASS *
55     *************************************************/
56    
57     /* This function is called to match a character against an extended class that
58     might contain values > 255.
59    
60     Arguments:
61     c the character
62     data points to the flag byte of the XCLASS data
63    
64     Returns: TRUE if character matches, else FALSE
65     */
66    
67 nigel 87 BOOL
68 nigel 77 _pcre_xclass(int c, const uschar *data)
69     {
70     int t;
71     BOOL negated = (*data & XCL_NOT) != 0;
72    
73     /* Character values < 256 are matched against a bitmap, if one is present. If
74     not, we still carry on, because there may be ranges that start below 256 in the
75     additional data. */
76    
77     if (c < 256)
78     {
79     if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
80     return !negated; /* char found */
81     }
82    
83     /* First skip the bit map if present. Then match against the list of Unicode
84     properties or large chars or ranges that end with a large char. We won't ever
85     encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
86    
87     if ((*data++ & XCL_MAP) != 0) data += 32;
88    
89     while ((t = *data++) != XCL_END)
90     {
91     int x, y;
92     if (t == XCL_SINGLE)
93     {
94     GETCHARINC(x, data);
95     if (c == x) return !negated;
96     }
97     else if (t == XCL_RANGE)
98     {
99     GETCHARINC(x, data);
100     GETCHARINC(y, data);
101     if (c >= x && c <= y) return !negated;
102     }
103    
104     #ifdef SUPPORT_UCP
105     else /* XCL_PROP & XCL_NOTPROP */
106     {
107 nigel 87 int chartype, script;
108     int category = _pcre_ucp_findprop(c, &chartype, &script);
109    
110     switch(*data)
111 nigel 77 {
112 nigel 87 case PT_ANY:
113     if (t == XCL_PROP) return !negated;
114     break;
115    
116     case PT_LAMP:
117     if ((chartype == ucp_Lu || chartype == ucp_Ll || chartype == ucp_Lt) ==
118     (t == XCL_PROP)) return !negated;
119     break;
120    
121     case PT_GC:
122     if ((data[1] == category) == (t == XCL_PROP)) return !negated;
123     break;
124    
125     case PT_PC:
126     if ((data[1] == chartype) == (t == XCL_PROP)) return !negated;
127     break;
128    
129     case PT_SC:
130     if ((data[1] == script) == (t == XCL_PROP)) return !negated;
131     break;
132    
133     /* This should never occur, but compilers may mutter if there is no
134     default. */
135    
136     default:
137     return FALSE;
138 nigel 77 }
139 nigel 87
140     data += 2;
141 nigel 77 }
142     #endif /* SUPPORT_UCP */
143     }
144    
145     return negated; /* char did not match */
146     }
147    
148     /* End of pcre_xclass.c */

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