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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// Copyright 2017 The Hugo Authors. All rights reserved.
//
// 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 collections
import (
"errors"
"fmt"
"reflect"
"github.com/gohugoio/hugo/common/types"
"github.com/mitchellh/hashstructure"
)
var (
zero reflect.Value
errorType = reflect.TypeOf((*error)(nil)).Elem()
)
func numberToFloat(v reflect.Value) (float64, error) {
switch kind := v.Kind(); {
case isFloat(kind):
return v.Float(), nil
case isInt(kind):
return float64(v.Int()), nil
case isUint(kind):
return float64(v.Uint()), nil
case kind == reflect.Interface:
return numberToFloat(v.Elem())
default:
return 0, fmt.Errorf("invalid kind %s in numberToFloat", kind)
}
}
// normalizes different numeric types if isNumber
// or get the hash values if not Comparable (such as map or struct)
// to make them comparable
func normalize(v reflect.Value) any {
k := v.Kind()
switch {
case !v.Type().Comparable():
h, err := hashstructure.Hash(v.Interface(), nil)
if err != nil {
panic(err)
}
return h
case isNumber(k):
f, err := numberToFloat(v)
if err == nil {
return f
}
}
return types.Unwrapv(v.Interface())
}
// collects identities from the slices in seqs into a set. Numeric values are normalized,
// pointers unwrapped.
func collectIdentities(seqs ...any) (map[any]bool, error) {
seen := make(map[any]bool)
for _, seq := range seqs {
v := reflect.ValueOf(seq)
switch v.Kind() {
case reflect.Array, reflect.Slice:
for i := 0; i < v.Len(); i++ {
ev, _ := indirectInterface(v.Index(i))
if !ev.Type().Comparable() {
return nil, errors.New("elements must be comparable")
}
seen[normalize(ev)] = true
}
default:
return nil, fmt.Errorf("arguments must be slices or arrays")
}
}
return seen, nil
}
// We have some different numeric and string types that we try to behave like
// they were the same.
func convertValue(v reflect.Value, to reflect.Type) (reflect.Value, error) {
if v.Type().AssignableTo(to) {
return v, nil
}
switch kind := to.Kind(); {
case kind == reflect.String:
s, err := toString(v)
return reflect.ValueOf(s), err
case isNumber(kind):
return convertNumber(v, kind)
default:
return reflect.Value{}, fmt.Errorf("%s is not assignable to %s", v.Type(), to)
}
}
// There are potential overflows in this function, but the downconversion of
// int64 etc. into int8 etc. is coming from the synthetic unit tests for Union etc.
// TODO(bep) We should consider normalizing the slices to int64 etc.
func convertNumber(v reflect.Value, to reflect.Kind) (reflect.Value, error) {
var n reflect.Value
if isFloat(to) {
f, err := toFloat(v)
if err != nil {
return n, err
}
switch to {
case reflect.Float32:
n = reflect.ValueOf(float32(f))
default:
n = reflect.ValueOf(float64(f))
}
} else if isInt(to) {
i, err := toInt(v)
if err != nil {
return n, err
}
switch to {
case reflect.Int:
n = reflect.ValueOf(int(i))
case reflect.Int8:
n = reflect.ValueOf(int8(i))
case reflect.Int16:
n = reflect.ValueOf(int16(i))
case reflect.Int32:
n = reflect.ValueOf(int32(i))
case reflect.Int64:
n = reflect.ValueOf(int64(i))
}
} else if isUint(to) {
i, err := toUint(v)
if err != nil {
return n, err
}
switch to {
case reflect.Uint:
n = reflect.ValueOf(uint(i))
case reflect.Uint8:
n = reflect.ValueOf(uint8(i))
case reflect.Uint16:
n = reflect.ValueOf(uint16(i))
case reflect.Uint32:
n = reflect.ValueOf(uint32(i))
case reflect.Uint64:
n = reflect.ValueOf(uint64(i))
}
}
if !n.IsValid() {
return n, errors.New("invalid values")
}
return n, nil
}
func newSliceElement(items any) any {
tp := reflect.TypeOf(items)
if tp == nil {
return nil
}
switch tp.Kind() {
case reflect.Array, reflect.Slice:
tp = tp.Elem()
if tp.Kind() == reflect.Ptr {
tp = tp.Elem()
}
return reflect.New(tp).Interface()
}
return nil
}
func isNumber(kind reflect.Kind) bool {
return isInt(kind) || isUint(kind) || isFloat(kind)
}
func isInt(kind reflect.Kind) bool {
switch kind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return true
default:
return false
}
}
func isUint(kind reflect.Kind) bool {
switch kind {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return true
default:
return false
}
}
func isFloat(kind reflect.Kind) bool {
switch kind {
case reflect.Float32, reflect.Float64:
return true
default:
return false
}
}
|
