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generator.go
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generator.go
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package random_string
import (
"fmt"
"math/rand"
"strings"
)
// Generator is common object which provides generation of random string
type Generator struct {
// All available runes for generated string
charset []rune
// Length of generated string
length int
}
// String returns string representation of Generator instance. Useful for logging.
func (g Generator) String() string {
var sCharset strings.Builder
for i, r := range g.charset {
if i != 0 {
sCharset.WriteString(", ")
}
sCharset.WriteString("'")
sCharset.WriteRune(r)
sCharset.WriteString("'")
}
return fmt.Sprintf("Generator(length = %d characters, charset = [%s])", g.length, sCharset.String())
}
// Generate creates string with random characters
func (g Generator) Generate() string {
var output strings.Builder
for i := 0; i < g.length; i++ {
random := rand.Intn(len(g.charset))
randomChar := g.charset[random]
output.WriteRune(randomChar)
}
return output.String()
}
// NewGenerator creates Generator instance with received length and characters set runes slice
func NewGenerator(length int, charset []rune) Generator {
return Generator{length: length, charset: charset}
}
// NewGeneratorFromString creates Generator instance with received length and characters set string
func NewGeneratorFromString(length int, charset string) Generator {
return NewGenerator(length, []rune(charset))
}