forked from evcc-io/evcc
/
calc.go
69 lines (55 loc) · 1.24 KB
/
calc.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
package provider
import (
"fmt"
"github.com/mark-sch/evcc/util"
)
type calcProvider struct {
add []func() (float64, error)
}
func init() {
registry.Add("calc", NewCalcFromConfig)
}
// NewCalcFromConfig creates calc provider
func NewCalcFromConfig(other map[string]interface{}) (IntProvider, error) {
cc := struct {
Add []Config
}{}
if err := util.DecodeOther(other, &cc); err != nil {
return nil, err
}
o := &calcProvider{}
for idx, cc := range cc.Add {
f, err := NewFloatGetterFromConfig(cc)
if err != nil {
return nil, fmt.Errorf("add[%d]: %w", idx, err)
}
o.add = append(o.add, f)
}
return o, nil
}
func (o *calcProvider) IntGetter() func() (int64, error) {
return func() (int64, error) {
f, err := o.floatGetter()
return int64(f), err
}
}
func (o *calcProvider) StringGetter() func() (string, error) {
return func() (string, error) {
f, err := o.floatGetter()
return fmt.Sprintf("%c", int(f)), err
}
}
func (o *calcProvider) FloatGetter() func() (float64, error) {
return o.floatGetter
}
func (o *calcProvider) floatGetter() (float64, error) {
var sum float64
for idx, p := range o.add {
v, err := p()
if err != nil {
return 0, fmt.Errorf("add[%d]: %w", idx, err)
}
sum += v
}
return sum, nil
}