| Don Newton | 98fd881 | 2019-09-23 15:15:02 -0400 | [diff] [blame^] | 1 | // Copyright 2018 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 | package language |
| 6 | |
| 7 | // CompactCoreInfo is a compact integer with the three core tags encoded. |
| 8 | type CompactCoreInfo uint32 |
| 9 | |
| 10 | // GetCompactCore generates a uint32 value that is guaranteed to be unique for |
| 11 | // different language, region, and script values. |
| 12 | func GetCompactCore(t Tag) (cci CompactCoreInfo, ok bool) { |
| 13 | if t.LangID > langNoIndexOffset { |
| 14 | return 0, false |
| 15 | } |
| 16 | cci |= CompactCoreInfo(t.LangID) << (8 + 12) |
| 17 | cci |= CompactCoreInfo(t.ScriptID) << 12 |
| 18 | cci |= CompactCoreInfo(t.RegionID) |
| 19 | return cci, true |
| 20 | } |
| 21 | |
| 22 | // Tag generates a tag from c. |
| 23 | func (c CompactCoreInfo) Tag() Tag { |
| 24 | return Tag{ |
| 25 | LangID: Language(c >> 20), |
| 26 | RegionID: Region(c & 0x3ff), |
| 27 | ScriptID: Script(c>>12) & 0xff, |
| 28 | } |
| 29 | } |