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

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Revision 93 - (hide annotations) (download)
Sat Feb 24 21:41:42 2007 UTC (7 years, 1 month ago) by nigel
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Load pcre-7.0 into code/trunk.

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     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 nigel 91 _pcre_ucp_findprop(const unsigned int c, int *type_ptr, int *script_ptr)
83 nigel 87 {
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 nigel 93 Returns: the other case or NOTACHAR if none
135 nigel 87 */
136    
137 nigel 93 unsigned int
138     _pcre_ucp_othercase(const unsigned int c)
139 nigel 87 {
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 nigel 93 /* Found an entry in the table. Return NOTACHAR for a range entry. Otherwise
165     return the other case if there is one, else NOTACHAR. */
166 nigel 87
167 nigel 93 if ((ucp_table[mid].f0 & f0_rangeflag) != 0) return NOTACHAR;
168 nigel 87
169     offset = ucp_table[mid].f1 & f1_casemask;
170     if ((offset & f1_caseneg) != 0) offset |= f1_caseneg;
171 nigel 93 return (offset == 0)? NOTACHAR : c + offset;
172 nigel 87 }
173    
174    
175     /* End of pcre_ucp_searchfuncs.c */

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