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randascii.go
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/
randascii.go
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package useless
import (
"math/rand"
"time"
)
// RandASCII generates a random string or char
type RandASCII struct {
randGen *rand.Rand
}
// NewRandASCII returns a new RandASCII instance
func NewRandASCII() *RandASCII {
return &RandASCII{
randGen: rand.New(rand.NewSource(time.Now().UnixNano())),
}
}
// GetRandomAlphanumChar returns a random alphanumeric ASCII character
func (r *RandASCII) GetRandomAlphanumChar() uint8 {
randoms := []func() uint8{
r.getRandomLowerChar, r.getRandomUpperChar, r.getRandomDigitChar,
}
r.randomSeed()
return randoms[r.randGen.Intn(3)+0]()
}
// GetRandomChar returns a random (alphanumeric and special) ASCII character
func (r *RandASCII) GetRandomChar() uint8 {
r.randomSeed()
randSpecialChars := []func() uint8{
r.getRandomSpecialCharSet1, r.getRandomSpecialCharSet2, r.getRandomSpecialCharSet3,
r.getRandomSpecialCharSet4, r.getRandomUpperChar, r.getRandomLowerChar, r.getRandomDigitChar}
return randSpecialChars[r.randGen.Intn(7)+0]()
}
// GetRandomString returns a random alphanumeric ASCII string of a given length
func (r *RandASCII) GetRandomAlphanumString(length int) string {
return r.getRandomString(length, r.GetRandomAlphanumChar)
}
// GetRandomString returns a random ASCII string of a given length
func (r *RandASCII) GetRandomString(length int) string {
return r.getRandomString(length, r.GetRandomChar)
}
// getRandomString returns a random ASCII string of a given length and the given random character generator
func (r RandASCII) getRandomString(length int, randCharGen func() uint8) string {
s := ""
for i := 0; i < length; i++ {
s += string(randCharGen())
}
return s
}
// getRandomLowerChar well it's written on the box :)
func (r *RandASCII) getRandomLowerChar() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(123-97) + 97)
}
// getRandomUpperChar well it's written on the box :)
func (r *RandASCII) getRandomUpperChar() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(91-65) + 65)
}
// getRandomDigitChar well it's written on the box :)
func (r *RandASCII) getRandomDigitChar() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(58-48) + 48)
}
// getRandomSpecialCharSet1 well it's written on the box :)
func (r *RandASCII) getRandomSpecialCharSet1() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(48-33) + 33)
}
// getRandomSpecialCharSet2 well it's written on the box :)
func (r *RandASCII) getRandomSpecialCharSet2() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(65-58) + 58)
}
// getRandomSpecialCharSet3 well it's written on the box :)
func (r *RandASCII) getRandomSpecialCharSet3() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(97-91) + 91)
}
// getRandomSpecialCharSet4 well it's written on the box :)
func (r *RandASCII) getRandomSpecialCharSet4() uint8 {
r.randomSeed()
return uint8(r.randGen.Intn(127-123) + 123)
}
// randomSeed seeds the random generator
func (r *RandASCII) randomSeed() {
r.randGen.Seed(time.Now().UnixNano())
}