/[pcre]/code/tags/pcre-6.5/pcre_ucp_searchfuncs.c
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Contents of /code/tags/pcre-6.5/pcre_ucp_searchfuncs.c

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Revision 88 - (show annotations) (download)
Sat Feb 24 21:41:23 2007 UTC (7 years, 1 month ago) by nigel
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Tag code/trunk as code/tags/pcre-6.5.

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) 1997-2006 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 #include "pcre_internal.h"
45
46 #include "ucp.h" /* Category definitions */
47 #include "ucpinternal.h" /* Internal table details */
48 #include "ucptable.c" /* The table itself */
49
50
51 /* Table to translate from particular type value to the general value. */
52
53 static int ucp_gentype[] = {
54 ucp_C, ucp_C, ucp_C, ucp_C, ucp_C, /* Cc, Cf, Cn, Co, Cs */
55 ucp_L, ucp_L, ucp_L, ucp_L, ucp_L, /* Ll, Lu, Lm, Lo, Lt */
56 ucp_M, ucp_M, ucp_M, /* Mc, Me, Mn */
57 ucp_N, ucp_N, ucp_N, /* Nd, Nl, No */
58 ucp_P, ucp_P, ucp_P, ucp_P, ucp_P, /* Pc, Pd, Pe, Pf, Pi */
59 ucp_P, ucp_P, /* Ps, Po */
60 ucp_S, ucp_S, ucp_S, ucp_S, /* Sc, Sk, Sm, So */
61 ucp_Z, ucp_Z, ucp_Z /* Zl, Zp, Zs */
62 };
63
64
65
66 /*************************************************
67 * Search table and return type *
68 *************************************************/
69
70 /* Three values are returned: the category is ucp_C, ucp_L, etc. The detailed
71 character type is ucp_Lu, ucp_Nd, etc. The script is ucp_Latin, etc.
72
73 Arguments:
74 c the character value
75 type_ptr the detailed character type is returned here
76 script_ptr the script is returned here
77
78 Returns: the character type category
79 */
80
81 int
82 _pcre_ucp_findprop(const int c, int *type_ptr, int *script_ptr)
83 {
84 int bot = 0;
85 int top = sizeof(ucp_table)/sizeof(cnode);
86 int mid;
87
88 /* The table is searched using a binary chop. You might think that using
89 intermediate variables to hold some of the common expressions would speed
90 things up, but tests with gcc 3.4.4 on Linux showed that, on the contrary, it
91 makes things a lot slower. */
92
93 for (;;)
94 {
95 if (top <= bot)
96 {
97 *type_ptr = ucp_Cn;
98 *script_ptr = ucp_Common;
99 return ucp_C;
100 }
101 mid = (bot + top) >> 1;
102 if (c == (ucp_table[mid].f0 & f0_charmask)) break;
103 if (c < (ucp_table[mid].f0 & f0_charmask)) top = mid;
104 else
105 {
106 if ((ucp_table[mid].f0 & f0_rangeflag) != 0 &&
107 c <= (ucp_table[mid].f0 & f0_charmask) +
108 (ucp_table[mid].f1 & f1_rangemask)) break;
109 bot = mid + 1;
110 }
111 }
112
113 /* Found an entry in the table. Set the script and detailed type values, and
114 return the general type. */
115
116 *script_ptr = (ucp_table[mid].f0 & f0_scriptmask) >> f0_scriptshift;
117 *type_ptr = (ucp_table[mid].f1 & f1_typemask) >> f1_typeshift;
118
119 return ucp_gentype[*type_ptr];
120 }
121
122
123
124 /*************************************************
125 * Search table and return other case *
126 *************************************************/
127
128 /* If the given character is a letter, and there is another case for the
129 letter, return the other case. Otherwise, return -1.
130
131 Arguments:
132 c the character value
133
134 Returns: the other case or -1 if none
135 */
136
137 int
138 _pcre_ucp_othercase(const int c)
139 {
140 int bot = 0;
141 int top = sizeof(ucp_table)/sizeof(cnode);
142 int mid, offset;
143
144 /* The table is searched using a binary chop. You might think that using
145 intermediate variables to hold some of the common expressions would speed
146 things up, but tests with gcc 3.4.4 on Linux showed that, on the contrary, it
147 makes things a lot slower. */
148
149 for (;;)
150 {
151 if (top <= bot) return -1;
152 mid = (bot + top) >> 1;
153 if (c == (ucp_table[mid].f0 & f0_charmask)) break;
154 if (c < (ucp_table[mid].f0 & f0_charmask)) top = mid;
155 else
156 {
157 if ((ucp_table[mid].f0 & f0_rangeflag) != 0 &&
158 c <= (ucp_table[mid].f0 & f0_charmask) +
159 (ucp_table[mid].f1 & f1_rangemask)) break;
160 bot = mid + 1;
161 }
162 }
163
164 /* Found an entry in the table. Return -1 for a range entry. Otherwise return
165 the other case if there is one, else -1. */
166
167 if ((ucp_table[mid].f0 & f0_rangeflag) != 0) return -1;
168
169 offset = ucp_table[mid].f1 & f1_casemask;
170 if ((offset & f1_caseneg) != 0) offset |= f1_caseneg;
171 return (offset == 0)? -1 : c + offset;
172 }
173
174
175 /* End of pcre_ucp_searchfuncs.c */

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