javascript - identifiers.go

     1  package internal
     2  
     3  import "unicode"
     4  
     5  var (
     6  	idContinue = []*unicode.RangeTable{
     7  		unicode.L,
     8  		unicode.Nl,
     9  		unicode.Other_ID_Start,
    10  		unicode.Mn,
    11  		unicode.Mc,
    12  		unicode.Nd,
    13  		unicode.Pc,
    14  		unicode.Other_ID_Continue,
    15  	}
    16  	idStart = idContinue[:3]
    17  	notID   = []*unicode.RangeTable{
    18  		unicode.Pattern_Syntax,
    19  		unicode.Pattern_White_Space,
    20  	}
    21  )
    22  
    23  const (
    24  	zwnj rune = 8204
    25  	zwj  rune = 8205
    26  )
    27  
    28  func IsIDStart(c rune) bool {
    29  	if c == '$' || c == '_' || c == '\\' {
    30  		return true
    31  	}
    32  	return unicode.In(c, idStart...) && !unicode.In(c, notID...)
    33  }
    34  
    35  func IsIDContinue(c rune) bool {
    36  	if c == '$' || c == '_' || c == '\\' || c == zwnj || c == zwj {
    37  		return true
    38  	}
    39  	return unicode.In(c, idContinue...) && !unicode.In(c, notID...)
    40  }
    41