javascript - tokens.go

     1  package minify
     2  
     3  import "vimagination.zapto.org/javascript/internal"
     4  
     5  const maxSafeInt = "9007199254740991"
     6  
     7  func isIdentifier(str string) bool {
     8  	for n, r := range str {
     9  		if (n == 0 && !internal.IsIDStart(r)) || (n > 0 && !internal.IsIDContinue(r)) {
    10  			return false
    11  		}
    12  	}
    13  	return true
    14  }
    15  
    16  func isSimpleNumber(str string) bool {
    17  	if str == "0" {
    18  		return true
    19  	}
    20  	if len(str) == 0 || len(str) > len(maxSafeInt) || str[0] < '1' || str[0] > '9' {
    21  		return false
    22  	}
    23  	for _, r := range str[1:] {
    24  		if r < '0' || r > '9' {
    25  			return false
    26  		}
    27  	}
    28  	return len(str) < len(maxSafeInt) || str <= maxSafeInt
    29  }
    30