Created
June 11, 2019 16:28
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Vowels reverse
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package main | |
import ( | |
"errors" | |
"fmt" | |
) | |
const ( | |
minStringLength = 3 | |
maxStringLength = 10 | |
) | |
type VowelsConverter struct { | |
bytes []byte | |
} | |
func (vc VowelsConverter) Validate() error { | |
if len(vc.bytes) < minStringLength || len(vc.bytes) > maxStringLength { | |
return errors.New("invalid string length") | |
} | |
return nil | |
} | |
func (vc VowelsConverter) PrintState() { | |
fmt.Println(string(vc.bytes)) | |
} | |
func (vc VowelsConverter) isVowel(letter byte) bool { | |
switch letter { | |
case 'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U': | |
return true | |
default: | |
} | |
return false | |
} | |
func (vc VowelsConverter) VowelsReverse() []byte { | |
j := len(vc.bytes) - 1 | |
for i := range vc.bytes { | |
if !vc.isVowel(vc.bytes[i]) { | |
continue | |
} | |
if j <= i { | |
return vc.bytes | |
} | |
for j > 0 { | |
if !vc.isVowel(vc.bytes[j]) { | |
j = j - 1 | |
continue | |
} | |
vc.bytes[i], vc.bytes[j] = vc.bytes[j], vc.bytes[i] | |
j = j - 1 | |
break | |
} | |
} | |
return vc.bytes | |
} | |
func main() { | |
//bytes, err := ioutil.ReadAll(os.Stdin) | |
//if err != nil { | |
// fmt.Println(err) | |
// return | |
// | |
//} | |
bytes := []byte("abcdefoui") | |
converter := VowelsConverter{ | |
bytes: bytes, | |
} | |
converter.PrintState() | |
err := converter.Validate() | |
if err != nil { | |
fmt.Println(err) | |
return | |
} | |
converter.VowelsReverse() | |
converter.PrintState() | |
} |
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