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

1 nigel 87 /*************************************************
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 ph10 117 Copyright (c) 1997-2007 University of Cambridge
10 nigel 87
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 ph10 200 #ifdef HAVE_CONFIG_H
45 ph10 236 #include "config.h"
46 ph10 200 #endif
47 ph10 199
48 nigel 87 #include "pcre_internal.h"
49    
50     #include "ucp.h" /* Category definitions */
51     #include "ucpinternal.h" /* Internal table details */
52 ph10 97 #include "ucptable.h" /* The table itself */
53 nigel 87
54    
55     /* Table to translate from particular type value to the general value. */
56    
57 ph10 105 static const int ucp_gentype[] = {
58 nigel 87 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 nigel 91 _pcre_ucp_findprop(const unsigned int c, int *type_ptr, int *script_ptr)
87 nigel 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 nigel 93 Returns: the other case or NOTACHAR if none
139 nigel 87 */
140    
141 nigel 93 unsigned int
142     _pcre_ucp_othercase(const unsigned int c)
143 nigel 87 {
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 nigel 93 /* 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 nigel 87
171 nigel 93 if ((ucp_table[mid].f0 & f0_rangeflag) != 0) return NOTACHAR;
172 nigel 87
173     offset = ucp_table[mid].f1 & f1_casemask;
174     if ((offset & f1_caseneg) != 0) offset |= f1_caseneg;
175 nigel 93 return (offset == 0)? NOTACHAR : c + offset;
176 nigel 87 }
177    
178    
179     /* End of pcre_ucp_searchfuncs.c */

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