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

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Revision 1404 - (show annotations)
Tue Nov 19 15:36:57 2013 UTC (5 years, 9 months ago) by ph10
File MIME type: text/plain
File size: 8071 byte(s)
Source tidies for 8.34-RC1.
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_MAP) != 0 &&
85 (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
86 return !negated; /* char found */
87 }
88
89 /* First skip the bit map if present. Then match against the list of Unicode
90 properties or large chars or ranges that end with a large char. We won't ever
91 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
92
93 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
94
95 while ((t = *data++) != XCL_END)
96 {
97 pcre_uint32 x, y;
98 if (t == XCL_SINGLE)
99 {
100 #ifdef SUPPORT_UTF
101 if (utf)
102 {
103 GETCHARINC(x, data); /* macro generates multiple statements */
104 }
105 else
106 #endif
107 x = *data++;
108 if (c == x) return !negated;
109 }
110 else if (t == XCL_RANGE)
111 {
112 #ifdef SUPPORT_UTF
113 if (utf)
114 {
115 GETCHARINC(x, data); /* macro generates multiple statements */
116 GETCHARINC(y, data); /* macro generates multiple statements */
117 }
118 else
119 #endif
120 {
121 x = *data++;
122 y = *data++;
123 }
124 if (c >= x && c <= y) return !negated;
125 }
126
127 #ifdef SUPPORT_UCP
128 else /* XCL_PROP & XCL_NOTPROP */
129 {
130 const ucd_record *prop = GET_UCD(c);
131 BOOL isprop = t == XCL_PROP;
132
133 switch(*data)
134 {
135 case PT_ANY:
136 if (isprop) return !negated;
137 break;
138
139 case PT_LAMP:
140 if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
141 prop->chartype == ucp_Lt) == isprop) return !negated;
142 break;
143
144 case PT_GC:
145 if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
146 return !negated;
147 break;
148
149 case PT_PC:
150 if ((data[1] == prop->chartype) == isprop) return !negated;
151 break;
152
153 case PT_SC:
154 if ((data[1] == prop->script) == isprop) return !negated;
155 break;
156
157 case PT_ALNUM:
158 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
159 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
160 return !negated;
161 break;
162
163 /* Perl space used to exclude VT, but from Perl 5.18 it is included,
164 which means that Perl space and POSIX space are now identical. PCRE
165 was changed at release 8.34. */
166
167 case PT_SPACE: /* Perl space */
168 case PT_PXSPACE: /* POSIX space */
169 switch(c)
170 {
171 HSPACE_CASES:
172 VSPACE_CASES:
173 if (isprop) return !negated;
174 break;
175
176 default:
177 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
178 return !negated;
179 break;
180 }
181 break;
182
183 case PT_WORD:
184 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
185 PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
186 == isprop)
187 return !negated;
188 break;
189
190 case PT_UCNC:
191 if (c < 0xa0)
192 {
193 if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
194 c == CHAR_GRAVE_ACCENT) == isprop)
195 return !negated;
196 }
197 else
198 {
199 if ((c < 0xd800 || c > 0xdfff) == isprop)
200 return !negated;
201 }
202 break;
203
204 /* The following three properties can occur only in an XCLASS, as there
205 is no \p or \P coding for them. */
206
207 /* Graphic character. Implement this as not Z (space or separator) and
208 not C (other), except for Cf (format) with a few exceptions. This seems
209 to be what Perl does. The exceptional characters are:
210
211 U+061C Arabic Letter Mark
212 U+180E Mongolian Vowel Separator
213 U+2066 - U+2069 Various "isolate"s
214 */
215
216 case PT_PXGRAPH:
217 if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
218 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
219 (prop->chartype == ucp_Cf &&
220 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
221 )) == isprop)
222 return !negated;
223 break;
224
225 /* Printable character: same as graphic, with the addition of Zs, i.e.
226 not Zl and not Zp, and U+180E. */
227
228 case PT_PXPRINT:
229 if ((prop->chartype != ucp_Zl &&
230 prop->chartype != ucp_Zp &&
231 (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
232 (prop->chartype == ucp_Cf &&
233 c != 0x061c && (c < 0x2066 || c > 0x2069))
234 )) == isprop)
235 return !negated;
236 break;
237
238 /* Punctuation: all Unicode punctuation, plus ASCII characters that
239 Unicode treats as symbols rather than punctuation, for Perl
240 compatibility (these are $+<=>^`|~). */
241
242 case PT_PXPUNCT:
243 if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
244 (c < 256 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
245 return !negated;
246 break;
247
248 /* This should never occur, but compilers may mutter if there is no
249 default. */
250
251 default:
252 return FALSE;
253 }
254
255 data += 2;
256 }
257 #endif /* SUPPORT_UCP */
258 }
259
260 return negated; /* char did not match */
261 }
262
263 /* End of pcre_xclass.c */

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