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15c0b25d AP |
1 | // Copyright 2015 The Go Authors. All rights reserved. |
2 | // Use of this source code is governed by a BSD-style | |
3 | // license that can be found in the LICENSE file. | |
4 | ||
5 | // +build ignore | |
6 | ||
7 | package main | |
8 | ||
9 | // Class is the Unicode BiDi class. Each rune has a single class. | |
10 | type Class uint | |
11 | ||
12 | const ( | |
13 | L Class = iota // LeftToRight | |
14 | R // RightToLeft | |
15 | EN // EuropeanNumber | |
16 | ES // EuropeanSeparator | |
17 | ET // EuropeanTerminator | |
18 | AN // ArabicNumber | |
19 | CS // CommonSeparator | |
20 | B // ParagraphSeparator | |
21 | S // SegmentSeparator | |
22 | WS // WhiteSpace | |
23 | ON // OtherNeutral | |
24 | BN // BoundaryNeutral | |
25 | NSM // NonspacingMark | |
26 | AL // ArabicLetter | |
27 | Control // Control LRO - PDI | |
28 | ||
29 | numClass | |
30 | ||
31 | LRO // LeftToRightOverride | |
32 | RLO // RightToLeftOverride | |
33 | LRE // LeftToRightEmbedding | |
34 | RLE // RightToLeftEmbedding | |
35 | PDF // PopDirectionalFormat | |
36 | LRI // LeftToRightIsolate | |
37 | RLI // RightToLeftIsolate | |
38 | FSI // FirstStrongIsolate | |
39 | PDI // PopDirectionalIsolate | |
40 | ||
41 | unknownClass = ^Class(0) | |
42 | ) | |
43 | ||
44 | var controlToClass = map[rune]Class{ | |
45 | 0x202D: LRO, // LeftToRightOverride, | |
46 | 0x202E: RLO, // RightToLeftOverride, | |
47 | 0x202A: LRE, // LeftToRightEmbedding, | |
48 | 0x202B: RLE, // RightToLeftEmbedding, | |
49 | 0x202C: PDF, // PopDirectionalFormat, | |
50 | 0x2066: LRI, // LeftToRightIsolate, | |
51 | 0x2067: RLI, // RightToLeftIsolate, | |
52 | 0x2068: FSI, // FirstStrongIsolate, | |
53 | 0x2069: PDI, // PopDirectionalIsolate, | |
54 | } | |
55 | ||
56 | // A trie entry has the following bits: | |
57 | // 7..5 XOR mask for brackets | |
58 | // 4 1: Bracket open, 0: Bracket close | |
59 | // 3..0 Class type | |
60 | ||
61 | const ( | |
62 | openMask = 0x10 | |
63 | xorMaskShift = 5 | |
64 | ) |