| Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame^] | 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 | // elem is an entry of the width trie. The high byte is used to encode the type |
| 10 | // of the rune. The low byte is used to store the index to a mapping entry in |
| 11 | // the inverseData array. |
| 12 | type elem uint16 |
| 13 | |
| 14 | const ( |
| 15 | tagNeutral elem = iota << typeShift |
| 16 | tagAmbiguous |
| 17 | tagWide |
| 18 | tagNarrow |
| 19 | tagFullwidth |
| 20 | tagHalfwidth |
| 21 | ) |
| 22 | |
| 23 | const ( |
| 24 | numTypeBits = 3 |
| 25 | typeShift = 16 - numTypeBits |
| 26 | |
| 27 | // tagNeedsFold is true for all fullwidth and halfwidth runes except for |
| 28 | // the Won sign U+20A9. |
| 29 | tagNeedsFold = 0x1000 |
| 30 | |
| 31 | // The Korean Won sign is halfwidth, but SHOULD NOT be mapped to a wide |
| 32 | // variant. |
| 33 | wonSign rune = 0x20A9 |
| 34 | ) |