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sequence.go
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sequence.go
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// Copyright © 2017 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.
package sequence
import (
"crypto/rand"
"math/big"
)
var rander = rand.Reader // random function
var (
AlphaNum = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
Alpha = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
AlphaLowerNum = []rune("abcdefghijklmnopqrstuvwxyz0123456789")
AlphaUpperNum = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
AlphaLower = []rune("abcdefghijklmnopqrstuvwxyz")
AlphaUpper = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
Numeric = []rune("0123456789")
)
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
}