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

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Revision 349 - (hide annotations) (download)
Wed Jul 2 18:42:11 2008 UTC (6 years, 5 months ago) by ph10
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Preliminary patch for upgraded Unicode Property support.

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 305 Copyright (c) 1997-2008 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 ph10 349 const ucd_record * prop = GET_UCD(c);
108 nigel 87
109     switch(*data)
110 nigel 77 {
111 nigel 87 case PT_ANY:
112     if (t == XCL_PROP) return !negated;
113     break;
114    
115     case PT_LAMP:
116 ph10 349 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt) ==
117 nigel 87 (t == XCL_PROP)) return !negated;
118     break;
119    
120     case PT_GC:
121 ph10 349 if ((data[1] == ucp_gentype[prop->chartype]) == (t == XCL_PROP)) return !negated;
122 nigel 87 break;
123    
124     case PT_PC:
125 ph10 349 if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;
126 nigel 87 break;
127    
128     case PT_SC:
129 ph10 349 if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;
130 nigel 87 break;
131    
132     /* This should never occur, but compilers may mutter if there is no
133     default. */
134    
135     default:
136     return FALSE;
137 nigel 77 }
138 nigel 87
139     data += 2;
140 nigel 77 }
141     #endif /* SUPPORT_UCP */
142     }
143    
144     return negated; /* char did not match */
145     }
146    
147     /* End of pcre_xclass.c */

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