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

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Revision 236 - (show annotations) (download)
Tue Sep 11 12:57:06 2007 UTC (7 years, 2 months ago) by ph10
File MIME type: text/plain
File size: 6109 byte(s)
<config.h> => "config.h" and also some cases of <pcre.h>.

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) 1997-2007 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 code for searching the table of Unicode character
42 properties. */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include "pcre_internal.h"
49
50 #include "ucp.h" /* Category definitions */
51 #include "ucpinternal.h" /* Internal table details */
52 #include "ucptable.h" /* The table itself */
53
54
55 /* Table to translate from particular type value to the general value. */
56
57 static const int ucp_gentype[] = {
58 ucp_C, ucp_C, ucp_C, ucp_C, ucp_C, /* Cc, Cf, Cn, Co, Cs */
59 ucp_L, ucp_L, ucp_L, ucp_L, ucp_L, /* Ll, Lu, Lm, Lo, Lt */
60 ucp_M, ucp_M, ucp_M, /* Mc, Me, Mn */
61 ucp_N, ucp_N, ucp_N, /* Nd, Nl, No */
62 ucp_P, ucp_P, ucp_P, ucp_P, ucp_P, /* Pc, Pd, Pe, Pf, Pi */
63 ucp_P, ucp_P, /* Ps, Po */
64 ucp_S, ucp_S, ucp_S, ucp_S, /* Sc, Sk, Sm, So */
65 ucp_Z, ucp_Z, ucp_Z /* Zl, Zp, Zs */
66 };
67
68
69
70 /*************************************************
71 * Search table and return type *
72 *************************************************/
73
74 /* Three values are returned: the category is ucp_C, ucp_L, etc. The detailed
75 character type is ucp_Lu, ucp_Nd, etc. The script is ucp_Latin, etc.
76
77 Arguments:
78 c the character value
79 type_ptr the detailed character type is returned here
80 script_ptr the script is returned here
81
82 Returns: the character type category
83 */
84
85 int
86 _pcre_ucp_findprop(const unsigned int c, int *type_ptr, int *script_ptr)
87 {
88 int bot = 0;
89 int top = sizeof(ucp_table)/sizeof(cnode);
90 int mid;
91
92 /* The table is searched using a binary chop. You might think that using
93 intermediate variables to hold some of the common expressions would speed
94 things up, but tests with gcc 3.4.4 on Linux showed that, on the contrary, it
95 makes things a lot slower. */
96
97 for (;;)
98 {
99 if (top <= bot)
100 {
101 *type_ptr = ucp_Cn;
102 *script_ptr = ucp_Common;
103 return ucp_C;
104 }
105 mid = (bot + top) >> 1;
106 if (c == (ucp_table[mid].f0 & f0_charmask)) break;
107 if (c < (ucp_table[mid].f0 & f0_charmask)) top = mid;
108 else
109 {
110 if ((ucp_table[mid].f0 & f0_rangeflag) != 0 &&
111 c <= (ucp_table[mid].f0 & f0_charmask) +
112 (ucp_table[mid].f1 & f1_rangemask)) break;
113 bot = mid + 1;
114 }
115 }
116
117 /* Found an entry in the table. Set the script and detailed type values, and
118 return the general type. */
119
120 *script_ptr = (ucp_table[mid].f0 & f0_scriptmask) >> f0_scriptshift;
121 *type_ptr = (ucp_table[mid].f1 & f1_typemask) >> f1_typeshift;
122
123 return ucp_gentype[*type_ptr];
124 }
125
126
127
128 /*************************************************
129 * Search table and return other case *
130 *************************************************/
131
132 /* If the given character is a letter, and there is another case for the
133 letter, return the other case. Otherwise, return -1.
134
135 Arguments:
136 c the character value
137
138 Returns: the other case or NOTACHAR if none
139 */
140
141 unsigned int
142 _pcre_ucp_othercase(const unsigned int c)
143 {
144 int bot = 0;
145 int top = sizeof(ucp_table)/sizeof(cnode);
146 int mid, offset;
147
148 /* The table is searched using a binary chop. You might think that using
149 intermediate variables to hold some of the common expressions would speed
150 things up, but tests with gcc 3.4.4 on Linux showed that, on the contrary, it
151 makes things a lot slower. */
152
153 for (;;)
154 {
155 if (top <= bot) return -1;
156 mid = (bot + top) >> 1;
157 if (c == (ucp_table[mid].f0 & f0_charmask)) break;
158 if (c < (ucp_table[mid].f0 & f0_charmask)) top = mid;
159 else
160 {
161 if ((ucp_table[mid].f0 & f0_rangeflag) != 0 &&
162 c <= (ucp_table[mid].f0 & f0_charmask) +
163 (ucp_table[mid].f1 & f1_rangemask)) break;
164 bot = mid + 1;
165 }
166 }
167
168 /* Found an entry in the table. Return NOTACHAR for a range entry. Otherwise
169 return the other case if there is one, else NOTACHAR. */
170
171 if ((ucp_table[mid].f0 & f0_rangeflag) != 0) return NOTACHAR;
172
173 offset = ucp_table[mid].f1 & f1_casemask;
174 if ((offset & f1_caseneg) != 0) offset |= f1_caseneg;
175 return (offset == 0)? NOTACHAR : c + offset;
176 }
177
178
179 /* End of pcre_ucp_searchfuncs.c */

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