compact.go

     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
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