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misc_test.go
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misc_test.go
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// Copyright 2020 Timothy E. Peoples
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
// ----------------------------------------------------------------------------
package ctxlock
import "fmt"
func formatList(a []byte) string {
chars := make([]string, len(a))
for i, c := range a {
chars[i] = fmt.Sprintf("%q", c)
}
return fmt.Sprintf("%v", chars)
}
func permutations(lists [][]byte) [][]byte {
var out [][]byte
var perm func(a [][]byte, i int)
perm = func(a [][]byte, i int) {
if i > len(a) {
var s []byte
for _, x := range a {
s = append(s, x...)
}
out = append(out, s)
return
}
perm(a, i+1)
for j := i + 1; j < len(a); j++ {
a[i], a[j] = a[j], a[i]
perm(a, i+1)
a[i], a[j] = a[j], a[i]
}
}
perm(lists, 0)
return out
}