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

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Revision 1414 - (show annotations) (download)
Sun Dec 22 16:27:35 2013 UTC (4 months ago) by zherczeg
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File size: 8231 byte(s)
A new flag is set, when property checks are present in an XCLASS.
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) 1997-2013 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)(pcre_uint32 c, const pcre_uchar *data, BOOL utf)
68 {
69 pcre_uchar t;
70 BOOL negated = (*data & XCL_NOT) != 0;
71
72 (void)utf;
73 #ifdef COMPILE_PCRE8
74 /* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
75 utf = TRUE;
76 #endif
77
78 /* Character values < 256 are matched against a bitmap, if one is present. If
79 not, we still carry on, because there may be ranges that start below 256 in the
80 additional data. */
81
82 if (c < 256)
83 {
84 if ((*data & XCL_HASPROP) == 0)
85 {
86 if ((*data & XCL_MAP) == 0) return negated;
87 return (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0;
88 }
89 if ((*data & XCL_MAP) != 0 &&
90 (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
91 return !negated; /* char found */
92 }
93
94 /* First skip the bit map if present. Then match against the list of Unicode
95 properties or large chars or ranges that end with a large char. We won't ever
96 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
97
98 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
99
100 while ((t = *data++) != XCL_END)
101 {
102 pcre_uint32 x, y;
103 if (t == XCL_SINGLE)
104 {
105 #ifdef SUPPORT_UTF
106 if (utf)
107 {
108 GETCHARINC(x, data); /* macro generates multiple statements */
109 }
110 else
111 #endif
112 x = *data++;
113 if (c == x) return !negated;
114 }
115 else if (t == XCL_RANGE)
116 {
117 #ifdef SUPPORT_UTF
118 if (utf)
119 {
120 GETCHARINC(x, data); /* macro generates multiple statements */
121 GETCHARINC(y, data); /* macro generates multiple statements */
122 }
123 else
124 #endif
125 {
126 x = *data++;
127 y = *data++;
128 }
129 if (c >= x && c <= y) return !negated;
130 }
131
132 #ifdef SUPPORT_UCP
133 else /* XCL_PROP & XCL_NOTPROP */
134 {
135 const ucd_record *prop = GET_UCD(c);
136 BOOL isprop = t == XCL_PROP;
137
138 switch(*data)
139 {
140 case PT_ANY:
141 if (isprop) return !negated;
142 break;
143
144 case PT_LAMP:
145 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
146 prop->chartype == ucp_Lt) == isprop) return !negated;
147 break;
148
149 case PT_GC:
150 if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
151 return !negated;
152 break;
153
154 case PT_PC:
155 if ((data[1] == prop->chartype) == isprop) return !negated;
156 break;
157
158 case PT_SC:
159 if ((data[1] == prop->script) == isprop) return !negated;
160 break;
161
162 case PT_ALNUM:
163 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
164 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
165 return !negated;
166 break;
167
168 /* Perl space used to exclude VT, but from Perl 5.18 it is included,
169 which means that Perl space and POSIX space are now identical. PCRE
170 was changed at release 8.34. */
171
172 case PT_SPACE: /* Perl space */
173 case PT_PXSPACE: /* POSIX space */
174 switch(c)
175 {
176 HSPACE_CASES:
177 VSPACE_CASES:
178 if (isprop) return !negated;
179 break;
180
181 default:
182 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
183 return !negated;
184 break;
185 }
186 break;
187
188 case PT_WORD:
189 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
190 PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
191 == isprop)
192 return !negated;
193 break;
194
195 case PT_UCNC:
196 if (c < 0xa0)
197 {
198 if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
199 c == CHAR_GRAVE_ACCENT) == isprop)
200 return !negated;
201 }
202 else
203 {
204 if ((c < 0xd800 || c > 0xdfff) == isprop)
205 return !negated;
206 }
207 break;
208
209 /* The following three properties can occur only in an XCLASS, as there
210 is no \p or \P coding for them. */
211
212 /* Graphic character. Implement this as not Z (space or separator) and
213 not C (other), except for Cf (format) with a few exceptions. This seems
214 to be what Perl does. The exceptional characters are:
215
216 U+061C Arabic Letter Mark
217 U+180E Mongolian Vowel Separator
218 U+2066 - U+2069 Various "isolate"s
219 */
220
221 case PT_PXGRAPH:
222 if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
223 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
224 (prop->chartype == ucp_Cf &&
225 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
226 )) == isprop)
227 return !negated;
228 break;
229
230 /* Printable character: same as graphic, with the addition of Zs, i.e.
231 not Zl and not Zp, and U+180E. */
232
233 case PT_PXPRINT:
234 if ((prop->chartype != ucp_Zl &&
235 prop->chartype != ucp_Zp &&
236 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
237 (prop->chartype == ucp_Cf &&
238 c != 0x061c && (c < 0x2066 || c > 0x2069))
239 )) == isprop)
240 return !negated;
241 break;
242
243 /* Punctuation: all Unicode punctuation, plus ASCII characters that
244 Unicode treats as symbols rather than punctuation, for Perl
245 compatibility (these are $+<=>^`|~). */
246
247 case PT_PXPUNCT:
248 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
249 (c < 256 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
250 return !negated;
251 break;
252
253 /* This should never occur, but compilers may mutter if there is no
254 default. */
255
256 default:
257 return FALSE;
258 }
259
260 data += 2;
261 }
262 #endif /* SUPPORT_UCP */
263 }
264
265 return negated; /* char did not match */
266 }
267
268 /* End of pcre_xclass.c */

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