compact.go raw

   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  }
  30