/[pcre]/code/branches/pcre16/pcre_xclass.c
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Contents of /code/branches/pcre16/pcre_xclass.c

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Revision 770 - (show annotations)
Mon Nov 28 20:39:30 2011 UTC (7 years, 11 months ago) by zherczeg
File MIME type: text/plain
File size: 5611 byte(s)
Make character ranges 16 bit friendly
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) 1997-2010 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. It is used by both pcre_exec() and pcre_def_exec(). */
43
44
45 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48
49 #include "pcre_internal.h"
50
51
52 /*************************************************
53 * Match character against an XCLASS *
54 *************************************************/
55
56 /* This function is called to match a character against an extended class that
57 might contain values > 255 and/or Unicode properties.
58
59 Arguments:
60 c the character
61 data points to the flag byte of the XCLASS data
62
63 Returns: TRUE if character matches, else FALSE
64 */
65
66 BOOL
67 PRIV(xclass)(int c, const pcre_uchar *data)
68 {
69 int t;
70 BOOL negated = (*data & XCL_NOT) != 0;
71
72 /* Character values < 256 are matched against a bitmap, if one is present. If
73 not, we still carry on, because there may be ranges that start below 256 in the
74 additional data. */
75
76 if (c < 256)
77 {
78 if ((*data & XCL_MAP) != 0 &&
79 (((pcre_uint8 *)(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 / sizeof(pcre_uchar);
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 const ucd_record *prop = GET_UCD(c);
108
109 switch(*data)
110 {
111 case PT_ANY:
112 if (t == XCL_PROP) return !negated;
113 break;
114
115 case PT_LAMP:
116 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
117 prop->chartype == ucp_Lt) == (t == XCL_PROP)) return !negated;
118 break;
119
120 case PT_GC:
121 if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == (t == XCL_PROP))
122 return !negated;
123 break;
124
125 case PT_PC:
126 if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;
127 break;
128
129 case PT_SC:
130 if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;
131 break;
132
133 case PT_ALNUM:
134 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
135 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == (t == XCL_PROP))
136 return !negated;
137 break;
138
139 case PT_SPACE: /* Perl space */
140 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
141 c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
142 == (t == XCL_PROP))
143 return !negated;
144 break;
145
146 case PT_PXSPACE: /* POSIX space */
147 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
148 c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
149 c == CHAR_FF || c == CHAR_CR) == (t == XCL_PROP))
150 return !negated;
151 break;
152
153 case PT_WORD:
154 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
155 PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
156 == (t == XCL_PROP))
157 return !negated;
158 break;
159
160 /* This should never occur, but compilers may mutter if there is no
161 default. */
162
163 default:
164 return FALSE;
165 }
166
167 data += 2;
168 }
169 #endif /* SUPPORT_UCP */
170 }
171
172 return negated; /* char did not match */
173 }
174
175 /* End of pcre_xclass.c */

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