/[pcre]/code/tags/pcre-5.0/ucp.c
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Contents of /code/tags/pcre-5.0/ucp.c

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Revision 76 - (show annotations)
Sat Feb 24 21:40:39 2007 UTC (12 years, 7 months ago) by nigel
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Tag code/trunk as code/tags/pcre-5.0.
1 /*************************************************
2 * libucp - Unicode Property Table handler *
3 *************************************************/
4
5 /* This function provides a fast way of obtaining the basic Unicode properties
6 of a character, using a compact binary tree that occupies less than 100K bytes.
7
8 Copyright (c) 2004 University of Cambridge
9
10 -------------------------------------------------------------------------------
11 Redistribution and use in source and binary forms, with or without
12 modification, are permitted provided that the following conditions are met:
13
14 * Redistributions of source code must retain the above copyright notice,
15 this list of conditions and the following disclaimer.
16
17 * Redistributions in binary form must reproduce the above copyright
18 notice, this list of conditions and the following disclaimer in the
19 documentation and/or other materials provided with the distribution.
20
21 * Neither the name of the University of Cambridge nor the names of its
22 contributors may be used to endorse or promote products derived from
23 this software without specific prior written permission.
24
25 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 POSSIBILITY OF SUCH DAMAGE.
36 -------------------------------------------------------------------------------
37 */
38
39
40 #include "ucp.h" /* Exported interface */
41 #include "ucpinternal.h" /* Internal table details */
42 #include "ucptable.c" /* The table itself */
43
44
45
46 /*************************************************
47 * Search table and return data *
48 *************************************************/
49
50 /* Two values are returned: the category is ucp_C, ucp_L, etc. The detailed
51 character type is ucp_Lu, ucp_Nd, etc.
52
53 Arguments:
54 c the character value
55 type_ptr the detailed character type is returned here
56 case_ptr for letters, the opposite case is returned here, if there
57 is one, else zero
58
59 Returns: the character type category or -1 if not found
60 */
61
62 static int
63 ucp_findchar(const int c, int *type_ptr, int *case_ptr)
64 {
65 cnode *node = ucp_table;
66 register int cc = c;
67 int case_offset;
68
69 for (;;)
70 {
71 register int d = node->f1 | ((node->f0 & f0_chhmask) << 16);
72 if (cc == d) break;
73 if (cc < d)
74 {
75 if ((node->f0 & f0_leftexists) == 0) return -1;
76 node ++;
77 }
78 else
79 {
80 register int roffset = (node->f2 & f2_rightmask) >> f2_rightshift;
81 if (roffset == 0) return -1;
82 node += 1 << (roffset - 1);
83 }
84 }
85
86 switch ((*type_ptr = ((node->f0 & f0_typemask) >> f0_typeshift)))
87 {
88 case ucp_Cc:
89 case ucp_Cf:
90 case ucp_Cn:
91 case ucp_Co:
92 case ucp_Cs:
93 return ucp_C;
94 break;
95
96 case ucp_Ll:
97 case ucp_Lu:
98 case_offset = node->f2 & f2_casemask;
99 if ((case_offset & 0x0100) != 0) case_offset |= 0xfffff000;
100 *case_ptr = (case_offset == 0)? 0 : cc + case_offset;
101 return ucp_L;
102
103 case ucp_Lm:
104 case ucp_Lo:
105 case ucp_Lt:
106 *case_ptr = 0;
107 return ucp_L;
108 break;
109
110 case ucp_Mc:
111 case ucp_Me:
112 case ucp_Mn:
113 return ucp_M;
114 break;
115
116 case ucp_Nd:
117 case ucp_Nl:
118 case ucp_No:
119 return ucp_N;
120 break;
121
122 case ucp_Pc:
123 case ucp_Pd:
124 case ucp_Pe:
125 case ucp_Pf:
126 case ucp_Pi:
127 case ucp_Ps:
128 case ucp_Po:
129 return ucp_P;
130 break;
131
132 case ucp_Sc:
133 case ucp_Sk:
134 case ucp_Sm:
135 case ucp_So:
136 return ucp_S;
137 break;
138
139 case ucp_Zl:
140 case ucp_Zp:
141 case ucp_Zs:
142 return ucp_Z;
143 break;
144
145 default: /* "Should never happen" */
146 return -1;
147 break;
148 }
149 }
150
151 /* End of ucp.c */

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