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170
vendor/github.com/astaxie/beego/utils/slice.go
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vendored
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170
vendor/github.com/astaxie/beego/utils/slice.go
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// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"math/rand"
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"time"
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)
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type reducetype func(interface{}) interface{}
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type filtertype func(interface{}) bool
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// InSlice checks given string in string slice or not.
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func InSlice(v string, sl []string) bool {
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for _, vv := range sl {
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if vv == v {
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return true
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}
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}
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return false
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}
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// InSliceIface checks given interface in interface slice.
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func InSliceIface(v interface{}, sl []interface{}) bool {
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for _, vv := range sl {
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if vv == v {
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return true
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}
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}
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return false
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}
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// SliceRandList generate an int slice from min to max.
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func SliceRandList(min, max int) []int {
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if max < min {
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min, max = max, min
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}
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length := max - min + 1
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t0 := time.Now()
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rand.Seed(int64(t0.Nanosecond()))
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list := rand.Perm(length)
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for index := range list {
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list[index] += min
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}
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return list
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}
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// SliceMerge merges interface slices to one slice.
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func SliceMerge(slice1, slice2 []interface{}) (c []interface{}) {
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c = append(slice1, slice2...)
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return
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}
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// SliceReduce generates a new slice after parsing every value by reduce function
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func SliceReduce(slice []interface{}, a reducetype) (dslice []interface{}) {
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for _, v := range slice {
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dslice = append(dslice, a(v))
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}
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return
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}
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// SliceRand returns random one from slice.
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func SliceRand(a []interface{}) (b interface{}) {
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randnum := rand.Intn(len(a))
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b = a[randnum]
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return
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}
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// SliceSum sums all values in int64 slice.
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func SliceSum(intslice []int64) (sum int64) {
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for _, v := range intslice {
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sum += v
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}
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return
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}
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// SliceFilter generates a new slice after filter function.
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func SliceFilter(slice []interface{}, a filtertype) (ftslice []interface{}) {
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for _, v := range slice {
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if a(v) {
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ftslice = append(ftslice, v)
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}
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}
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return
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}
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// SliceDiff returns diff slice of slice1 - slice2.
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func SliceDiff(slice1, slice2 []interface{}) (diffslice []interface{}) {
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for _, v := range slice1 {
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if !InSliceIface(v, slice2) {
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diffslice = append(diffslice, v)
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}
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}
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return
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}
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// SliceIntersect returns slice that are present in all the slice1 and slice2.
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func SliceIntersect(slice1, slice2 []interface{}) (diffslice []interface{}) {
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for _, v := range slice1 {
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if InSliceIface(v, slice2) {
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diffslice = append(diffslice, v)
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}
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}
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return
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}
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// SliceChunk separates one slice to some sized slice.
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func SliceChunk(slice []interface{}, size int) (chunkslice [][]interface{}) {
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if size >= len(slice) {
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chunkslice = append(chunkslice, slice)
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return
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}
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end := size
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for i := 0; i <= (len(slice) - size); i += size {
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chunkslice = append(chunkslice, slice[i:end])
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end += size
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}
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return
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}
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// SliceRange generates a new slice from begin to end with step duration of int64 number.
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func SliceRange(start, end, step int64) (intslice []int64) {
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for i := start; i <= end; i += step {
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intslice = append(intslice, i)
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}
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return
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}
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// SlicePad prepends size number of val into slice.
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func SlicePad(slice []interface{}, size int, val interface{}) []interface{} {
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if size <= len(slice) {
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return slice
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}
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for i := 0; i < (size - len(slice)); i++ {
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slice = append(slice, val)
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}
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return slice
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}
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// SliceUnique cleans repeated values in slice.
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func SliceUnique(slice []interface{}) (uniqueslice []interface{}) {
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for _, v := range slice {
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if !InSliceIface(v, uniqueslice) {
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uniqueslice = append(uniqueslice, v)
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}
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}
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return
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}
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// SliceShuffle shuffles a slice.
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func SliceShuffle(slice []interface{}) []interface{} {
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for i := 0; i < len(slice); i++ {
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a := rand.Intn(len(slice))
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b := rand.Intn(len(slice))
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slice[a], slice[b] = slice[b], slice[a]
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}
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return slice
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}
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