-
Notifications
You must be signed in to change notification settings - Fork 3
/
slice.go
129 lines (116 loc) · 3.58 KB
/
slice.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
// Copyright 2023 Cisco Systems, Inc. and its affiliates
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package utils
import (
"encoding/json"
"reflect"
"strings"
)
// Reverse will reverse the order of the given slice
func Reverse[T any](input []T) {
for i, j := 0, len(input)-1; i < j; i, j = i+1, j-1 {
input[i], input[j] = input[j], input[i]
}
}
// RemoveStable will remove an element from the slice and keep its order. This
// operation can be potentially costly depending on how large the slice is since
// it needs to shift all elements that appear after index i over by 1.
//
// This function will automatically type itself using type inference.
//
// If the given index is not within the bounds of the slice, then the function will
// panic
func RemoveStable[T any](slice []T, index int) []T {
if index < 0 || index >= len(slice) {
panic("invalid slice index")
}
return append(slice[:index], slice[index+1:]...)
}
// Remove will not keep the ordering of the slice. It has a very fast operation.
// This function will automatically type itself using type inference
//
// intSlice := []int{1, 2, 3, 4}
// intSlice = Remove(intSlice, 1)
// result: {1, 4, 3}
func Remove[T any](slice []T, index int) []T {
if index < 0 || index >= len(slice) {
panic("invalid slice index")
}
slice[index] = slice[len(slice)-1]
return slice[:len(slice)-1]
}
// ConvertSlice attempt to convert []interface{} to []elementType using the first element's type.
// if given slice is empty, or any elements is not the same type of first one, same slice is returned
func ConvertSlice(slice []interface{}) interface{} {
if len(slice) == 0 {
return slice
}
var failed bool
vSlice := reflect.MakeSlice(reflect.SliceOf(reflect.TypeOf(slice[0])), len(slice), len(slice))
for i, v := range slice {
rv := reflect.ValueOf(v)
ev := vSlice.Index(i)
if !rv.Type().ConvertibleTo(ev.Type()) {
failed = true
break
}
ev.Set(rv.Convert(ev.Type()))
}
if !failed {
return vSlice.Interface()
}
return slice
}
// CommaSeparatedSlice alias of []string that can deserialize from comma delimited string
type CommaSeparatedSlice []string
// fmt.Stringer
func (s CommaSeparatedSlice) String() string {
return strings.Join(s, ", ")
}
// MarshalText encoding.TextMarshaler
func (s CommaSeparatedSlice) MarshalText() ([]byte, error) {
return []byte(s.String()), nil
}
// UnmarshalText encoding.TextUnmarshaler
func (s *CommaSeparatedSlice) UnmarshalText(data []byte) error {
if string(data) == "" {
*s = make([]string, 0)
return nil
}
var result []string
split := strings.Split(string(data), ",")
for _, s := range split {
s = strings.TrimSpace(s)
result = append(result, s)
}
*s = result
return nil
}
// UnmarshalJSON json.Unmarshaler
func (s *CommaSeparatedSlice) UnmarshalJSON(data []byte) error {
// first try regular array
var slice []string
if e := json.Unmarshal(data, &slice); e == nil {
*s = slice
return nil
}
// try comma separated format
var str string
if e := json.Unmarshal(data, &str); e != nil {
return e
}
return s.UnmarshalText([]byte(str))
}