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Side by Side Diff: runtime/third_party/jscre/ucpinternal.h

Issue 1071713003: - Remove JSCRE from the runtime. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 5 years, 8 months ago
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1 /* This is JavaScriptCore's variant of the PCRE library. While this library
2 started out as a copy of PCRE, many of the features of PCRE have been
3 removed. This library now supports only the regular expression features
4 required by the JavaScript language specification, and has only the functions
5 needed by JavaScriptCore and the rest of WebKit.
6
7 Originally written by Philip Hazel
8 Copyright (c) 1997-2006 University of Cambridge
9 Copyright (C) 2002, 2004, 2006, 2007 Apple Inc. All rights reserved.
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 #ifndef THIRD_PARTY_JSCRE_UCPINTERNAL_H_
41 #define THIRD_PARTY_JSCRE_UCPINTERNAL_H_
42
43 /*************************************************
44 * Unicode Property Table handler *
45 *************************************************/
46
47 /* Internal header file defining the layout of the bits in each pair of 32-bit
48 words that form a data item in the table. */
49
50 typedef struct cnode {
51 unsigned f0;
52 unsigned f1;
53 } cnode;
54
55 /* Things for the f0 field */
56
57 #define f0_scriptmask 0xff000000 /* Mask for script field */
58 #define f0_scriptshift 24 /* Shift for script value */
59 #define f0_rangeflag 0x00f00000 /* Flag for a range item */
60 #define f0_charmask 0x001fffff /* Mask for code point value */
61
62 /* Things for the f1 field */
63
64 #define f1_typemask 0xfc000000 /* Mask for char type field */
65 #define f1_typeshift 26 /* Shift for the type field */
66 #define f1_rangemask 0x0000ffff /* Mask for a range offset */
67 #define f1_casemask 0x0000ffff /* Mask for a case offset */
68 #define f1_caseneg 0xffff8000 /* Bits for negation */
69
70 /* The data consists of a vector of structures of type cnode. The two unsigned
71 32-bit integers are used as follows:
72
73 (f0) (1) The most significant byte holds the script number. The numbers are
74 defined by the enum in ucp.h.
75
76 (2) The 0x00800000 bit is set if this entry defines a range of characters.
77 It is not set if this entry defines a single character
78
79 (3) The 0x00600000 bits are spare.
80
81 (4) The 0x001fffff bits contain the code point. No Unicode code point will
82 ever be greater than 0x0010ffff, so this should be OK for ever.
83
84 (f1) (1) The 0xfc000000 bits contain the character type number. The numbers are
85 defined by an enum in ucp.h.
86
87 (2) The 0x03ff0000 bits are spare.
88
89 (3) The 0x0000ffff bits contain EITHER the unsigned offset to the top of
90 range if this entry defines a range, OR the *signed* offset to the
91 character's "other case" partner if this entry defines a single
92 character. There is no partner if the value is zero.
93
94 -------------------------------------------------------------------------------
95 | script (8) |.|.|.| codepoint (21) || type (6) |.|.| spare (8) | offset (16) |
96 -------------------------------------------------------------------------------
97 | | | | |
98 | | |-> spare | |-> spare
99 | | |
100 | |-> spare |-> spare
101 |
102 |-> range flag
103
104 The upper/lower casing information is set only for characters that come in
105 pairs. The non-one-to-one mappings in the Unicode data are ignored.
106
107 When searching the data, proceed as follows:
108
109 (1) Set up for a binary chop search.
110
111 (2) If the top is not greater than the bottom, the character is not in the
112 table. Its type must therefore be "Cn" ("Undefined").
113
114 (3) Find the middle vector element.
115
116 (4) Extract the code point and compare. If equal, we are done.
117
118 (5) If the test character is smaller, set the top to the current point, and
119 goto (2).
120
121 (6) If the current entry defines a range, compute the last character by adding
122 the offset, and see if the test character is within the range. If it is,
123 we are done.
124
125 (7) Otherwise, set the bottom to one element past the current point and goto
126 (2).
127 */
128
129 /* End of ucpinternal.h */
130 #endif // THIRD_PARTY_JSCRE_UCPINTERNAL_H_
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