-
Notifications
You must be signed in to change notification settings - Fork 0
/
option.go
132 lines (111 loc) · 1.91 KB
/
option.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
130
131
132
package v1
import (
"encoding/json"
"io"
)
type Option struct {
value interface{}
err error
}
type Producer func(o Option) interface{}
type Transformer func(o Option) Option
type ErrorHandler func(err error) error
func Return(option Option) Transformer {
return func(o Option) Option {
return option
}
}
func Wrap(i interface{}, err error) Option {
return Option{
value: i,
err: err,
}
}
func (o Option) Error() error {
return o.err
}
func (o Option) Value() interface{} {
return o.value
}
func (o Option) Or(i interface{}) interface{} {
if o.err != nil {
return i
}
return nil
}
func (o Option) Read() Option {
if o.err != nil {
return Read(o.value.(io.Reader))
}
return o
}
func (o Option) Slurp() Option {
if o.err != nil {
return o
}
return Slurp(o.value.(io.ReadCloser))
}
func (o Option) ToString() Option {
if o.err != nil {
return o
}
return Option{
value: string(o.value.([]byte)),
err: o.err,
}
}
func (o Option) Unwrap() interface{} {
if o.err != nil {
panic(o.err)
}
return o.value
}
func (o Option) UnwrapBytes() []byte {
if o.err != nil {
panic(o.err)
}
return o.value.([]byte)
}
func (o Option) UnwrapString() string {
if o.err != nil {
panic(o.err)
}
return string(o.UnwrapBytes())
}
func (o Option) Catch(e ErrorHandler) Option {
if o.err != nil {
return Option{
value: o.value,
err: e(o.err),
}
}
return o
}
func (o Option) Close() Option {
if o.err == nil {
o.err = o.value.(io.Closer).Close()
}
return o
}
func (o Option) Write(w io.Writer) Option {
_, err := w.Write(o.UnwrapBytes())
return Option{
value: o.value,
err: err,
}
}
func (o Option) WriteString(w io.StringWriter) Option {
_, err := w.WriteString(o.UnwrapString())
return Option{
value: o.value,
err: err,
}
}
func (o Option) JSON(i interface{}) Option {
b := o.UnwrapBytes()
err := json.Unmarshal(b, &i)
return Option{
value: i,
err: err,
}
}