gtsocial-umbx

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compact.go (853B)

      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 }