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sequence.go
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sequence.go
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/*
* Copyright © 2015-2018 Aeneas Rekkas <aeneas+oss@aeneas.io>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @author Aeneas Rekkas <aeneas+oss@aeneas.io>
* @copyright 2015-2018 Aeneas Rekkas <aeneas+oss@aeneas.io>
* @license Apache-2.0
*/
package randx
import (
"crypto/rand"
"math/big"
)
var rander = rand.Reader // random function
var (
// AlphaNum contains runes [abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789].
AlphaNum = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
// Alpha contains runes [abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ].
Alpha = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
// AlphaLowerNum contains runes [abcdefghijklmnopqrstuvwxyz0123456789].
AlphaLowerNum = []rune("abcdefghijklmnopqrstuvwxyz0123456789")
// AlphaUpperNum contains runes [ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789].
AlphaUpperNum = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
// AlphaLower contains runes [abcdefghijklmnopqrstuvwxyz].
AlphaLower = []rune("abcdefghijklmnopqrstuvwxyz")
// AlphaUpper contains runes [ABCDEFGHIJKLMNOPQRSTUVWXYZ].
AlphaUpper = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
// Numeric contains runes [0123456789].
Numeric = []rune("0123456789")
)
// RuneSequence returns a random sequence using the defined allowed runes.
func RuneSequence(l int, allowedRunes []rune) (seq []rune, err error) {
c := big.NewInt(int64(len(allowedRunes)))
seq = make([]rune, l)
for i := 0; i < l; i++ {
r, err := rand.Int(rander, c)
if err != nil {
return seq, err
}
rn := allowedRunes[r.Uint64()]
seq[i] = rn
}
return seq, nil
}
// MustString returns a random string sequence using the defined runes. Panics on error.
func MustString(l int, allowedRunes []rune) string {
seq, err := RuneSequence(l, allowedRunes)
if err != nil {
panic(err)
}
return string(seq)
}