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sorting.go
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sorting.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package utils
import (
"bytes"
"sort"
)
// IsSortedAndUnique returns true if the elements in the data are unique and sorted.
func IsSortedAndUnique(data sort.Interface) bool {
for i := data.Len() - 2; i >= 0; i-- {
if !data.Less(i, i+1) {
return false
}
}
return true
}
type innerSortUint32 []uint32
func (su32 innerSortUint32) Less(i, j int) bool { return su32[i] < su32[j] }
func (su32 innerSortUint32) Len() int { return len(su32) }
func (su32 innerSortUint32) Swap(i, j int) { su32[j], su32[i] = su32[i], su32[j] }
// SortUint32 sorts an uint32 array
func SortUint32(u32 []uint32) { sort.Sort(innerSortUint32(u32)) }
// IsSortedAndUniqueUint32 returns true if the array of uint32s are sorted and unique
func IsSortedAndUniqueUint32(arr []uint32) bool {
for i := 0; i < len(arr)-1; i++ {
if arr[i] >= arr[i+1] {
return false
}
}
return true
}
type innerSortUint64 []uint64
func (su64 innerSortUint64) Less(i, j int) bool { return su64[i] < su64[j] }
func (su64 innerSortUint64) Len() int { return len(su64) }
func (su64 innerSortUint64) Swap(i, j int) { su64[j], su64[i] = su64[i], su64[j] }
// SortUint64 sorts an uint64 array
func SortUint64(u64 []uint64) { sort.Sort(innerSortUint64(u64)) }
// IsSortedAndUniqueUint64 returns true if the array of uint64s are sorted and unique
func IsSortedAndUniqueUint64(u64 []uint64) bool { return IsSortedAndUnique(innerSortUint64(u64)) }
type innerSortBytes [][]byte
func (arr innerSortBytes) Less(i, j int) bool {
return bytes.Compare(arr[i], arr[j]) == -1
}
func (arr innerSortBytes) Len() int { return len(arr) }
func (arr innerSortBytes) Swap(i, j int) { arr[j], arr[i] = arr[i], arr[j] }
// Sort2DBytes sorts a 2D byte array
// Each byte array is not sorted internally; the byte arrays are sorted relative to another.
func Sort2DBytes(arr [][]byte) { sort.Sort(innerSortBytes(arr)) }
// IsSorted2DBytes returns true iff [arr] is sorted
func IsSorted2DBytes(arr [][]byte) bool { return sort.IsSorted(innerSortBytes(arr)) }