github.com/searKing/golang/go@v1.2.117/unicode/letter.go (about)

     1  // Copyright 2020 The searKing Author. 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 unicode
     6  
     7  import "unicode"
     8  
     9  // IsASCII reports whether the rune is a ASCII character.
    10  func IsASCII(s rune) bool {
    11  	return s < unicode.MaxASCII
    12  }
    13  
    14  // IsLatin1 reports whether the rune is a latin1 (ISO-8859-1) character.
    15  func IsLatin1(s rune) bool {
    16  	return s < unicode.MaxLatin1
    17  }
    18  
    19  // IsASCIIUpper reports whether the rune is an ASCII and upper case letter.
    20  func IsASCIIUpper(r rune) bool {
    21  	return IsASCII(r) && unicode.IsUpper(r)
    22  }
    23  
    24  // IsASCIILower reports whether the rune is an ASCII and lower case letter.
    25  func IsASCIILower(r rune) bool {
    26  	return IsASCII(r) && unicode.IsLower(r)
    27  }
    28  
    29  // IsASCIIDigit reports whether the rune is an ASCII and decimal digit.
    30  func IsASCIIDigit(r rune) bool {
    31  	return IsASCII(r) && unicode.IsDigit(r)
    32  }
    33  
    34  // IsVowel reports whether the rune is an ASCII and vowel case letter.
    35  func IsVowel(s rune) bool {
    36  	switch unicode.ToUpper(s) {
    37  	case 'A', 'E', 'I', 'O', 'U':
    38  		return true
    39  	default:
    40  		return false
    41  	}
    42  }
    43  
    44  // IsConsonant reports whether the rune is an ASCII and consonant case letter.
    45  func IsConsonant(s rune) bool {
    46  	switch unicode.ToUpper(s) {
    47  	case 'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z':
    48  		return true
    49  	default:
    50  		return false
    51  	}
    52  }