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pcre_ucp_searchfuncs.c
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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
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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 unsigned 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 NOTACHAR if none
135 */
136 
137 unsigned int
138 _pcre_ucp_othercase(const unsigned 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 NOTACHAR for a range entry. Otherwise
165 return the other case if there is one, else NOTACHAR. */
166 
167 if ((ucp_table[mid].f0 & f0_rangeflag) != 0) return NOTACHAR;
168 
169 offset = ucp_table[mid].f1 & f1_casemask;
170 if ((offset & f1_caseneg) != 0) offset |= f1_caseneg;
171 return (offset == 0)? NOTACHAR : c + offset;
172 }
173 
174 
175 /* End of pcre_ucp_searchfuncs.c */
#define NOTACHAR
static int ucp_gentype[]
int _pcre_ucp_findprop(const unsigned int c, int *type_ptr, int *script_ptr)
unsigned int _pcre_ucp_othercase(const unsigned int c)
static int offset
Definition: read.c:62
pcre_uint32 f1
Definition: ucpinternal.h:13
pcre_uint32 f0
Definition: ucpinternal.h:12
@ ucp_Cn
Definition: ucp.h:30
@ ucp_C
Definition: ucp.h:16
@ ucp_Z
Definition: ucp.h:22
@ ucp_P
Definition: ucp.h:20
@ ucp_M
Definition: ucp.h:18
@ ucp_S
Definition: ucp.h:21
@ ucp_N
Definition: ucp.h:19
@ ucp_L
Definition: ucp.h:17
@ ucp_Common
Definition: ucp.h:72
#define f0_scriptshift
Definition: ucpinternal.h:19
#define f1_casemask
Definition: ucpinternal.h:28
#define f0_scriptmask
Definition: ucpinternal.h:18
#define f1_caseneg
Definition: ucpinternal.h:29
#define f0_rangeflag
Definition: ucpinternal.h:20
#define f1_rangemask
Definition: ucpinternal.h:27
#define f1_typeshift
Definition: ucpinternal.h:26
#define f0_charmask
Definition: ucpinternal.h:21
#define f1_typemask
Definition: ucpinternal.h:25
static cnode ucp_table[]
Definition: ucptable.c:5