author | Mikael Berthe <mikael@lilotux.net> |
Sun, 11 Jul 2021 10:35:56 +0200 | |
changeset 256 | 6d9efbef00a9 |
parent 251 | 1c52a0eeb952 |
child 260 | 445e01aede7e |
permissions | -rw-r--r-- |
242
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1 |
package mapstructure |
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2 |
|
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3 |
import ( |
256 | 4 |
"encoding" |
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5 |
"errors" |
251 | 6 |
"fmt" |
7 |
"net" |
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8 |
"reflect" |
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"strconv" |
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"strings" |
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11 |
"time" |
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12 |
) |
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13 |
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14 |
// typedDecodeHook takes a raw DecodeHookFunc (an interface{}) and turns |
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15 |
// it into the proper DecodeHookFunc type, such as DecodeHookFuncType. |
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16 |
func typedDecodeHook(h DecodeHookFunc) DecodeHookFunc { |
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// Create variables here so we can reference them with the reflect pkg |
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18 |
var f1 DecodeHookFuncType |
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19 |
var f2 DecodeHookFuncKind |
256 | 20 |
var f3 DecodeHookFuncValue |
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21 |
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// Fill in the variables into this interface and the rest is done |
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23 |
// automatically using the reflect package. |
256 | 24 |
potential := []interface{}{f1, f2, f3} |
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25 |
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v := reflect.ValueOf(h) |
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vt := v.Type() |
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28 |
for _, raw := range potential { |
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pt := reflect.ValueOf(raw).Type() |
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if vt.ConvertibleTo(pt) { |
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return v.Convert(pt).Interface() |
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32 |
} |
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} |
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34 |
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35 |
return nil |
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} |
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// DecodeHookExec executes the given decode hook. This should be used |
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39 |
// since it'll naturally degrade to the older backwards compatible DecodeHookFunc |
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// that took reflect.Kind instead of reflect.Type. |
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41 |
func DecodeHookExec( |
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42 |
raw DecodeHookFunc, |
256 | 43 |
from reflect.Value, to reflect.Value) (interface{}, error) { |
44 |
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45 |
switch f := typedDecodeHook(raw).(type) { |
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46 |
case DecodeHookFuncType: |
256 | 47 |
return f(from.Type(), to.Type(), from.Interface()) |
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case DecodeHookFuncKind: |
256 | 49 |
return f(from.Kind(), to.Kind(), from.Interface()) |
50 |
case DecodeHookFuncValue: |
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51 |
return f(from, to) |
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52 |
default: |
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return nil, errors.New("invalid decode hook signature") |
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} |
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55 |
} |
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56 |
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// ComposeDecodeHookFunc creates a single DecodeHookFunc that |
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58 |
// automatically composes multiple DecodeHookFuncs. |
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// |
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// The composed funcs are called in order, with the result of the |
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61 |
// previous transformation. |
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62 |
func ComposeDecodeHookFunc(fs ...DecodeHookFunc) DecodeHookFunc { |
256 | 63 |
return func(f reflect.Value, t reflect.Value) (interface{}, error) { |
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var err error |
256 | 65 |
var data interface{} |
66 |
newFrom := f |
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for _, f1 := range fs { |
256 | 68 |
data, err = DecodeHookExec(f1, newFrom, t) |
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if err != nil { |
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return nil, err |
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} |
256 | 72 |
newFrom = reflect.ValueOf(data) |
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} |
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74 |
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return data, nil |
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76 |
} |
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77 |
} |
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78 |
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// StringToSliceHookFunc returns a DecodeHookFunc that converts |
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80 |
// string to []string by splitting on the given sep. |
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81 |
func StringToSliceHookFunc(sep string) DecodeHookFunc { |
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return func( |
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83 |
f reflect.Kind, |
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84 |
t reflect.Kind, |
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85 |
data interface{}) (interface{}, error) { |
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86 |
if f != reflect.String || t != reflect.Slice { |
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87 |
return data, nil |
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88 |
} |
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89 |
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90 |
raw := data.(string) |
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91 |
if raw == "" { |
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92 |
return []string{}, nil |
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93 |
} |
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94 |
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95 |
return strings.Split(raw, sep), nil |
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96 |
} |
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} |
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98 |
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99 |
// StringToTimeDurationHookFunc returns a DecodeHookFunc that converts |
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100 |
// strings to time.Duration. |
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101 |
func StringToTimeDurationHookFunc() DecodeHookFunc { |
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102 |
return func( |
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103 |
f reflect.Type, |
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104 |
t reflect.Type, |
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105 |
data interface{}) (interface{}, error) { |
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106 |
if f.Kind() != reflect.String { |
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107 |
return data, nil |
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108 |
} |
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109 |
if t != reflect.TypeOf(time.Duration(5)) { |
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110 |
return data, nil |
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111 |
} |
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112 |
|
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113 |
// Convert it by parsing |
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114 |
return time.ParseDuration(data.(string)) |
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115 |
} |
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116 |
} |
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117 |
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251 | 118 |
// StringToIPHookFunc returns a DecodeHookFunc that converts |
119 |
// strings to net.IP |
|
120 |
func StringToIPHookFunc() DecodeHookFunc { |
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121 |
return func( |
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122 |
f reflect.Type, |
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123 |
t reflect.Type, |
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124 |
data interface{}) (interface{}, error) { |
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if f.Kind() != reflect.String { |
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126 |
return data, nil |
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127 |
} |
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128 |
if t != reflect.TypeOf(net.IP{}) { |
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return data, nil |
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} |
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132 |
// Convert it by parsing |
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133 |
ip := net.ParseIP(data.(string)) |
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134 |
if ip == nil { |
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return net.IP{}, fmt.Errorf("failed parsing ip %v", data) |
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136 |
} |
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138 |
return ip, nil |
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} |
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140 |
} |
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// StringToIPNetHookFunc returns a DecodeHookFunc that converts |
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// strings to net.IPNet |
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144 |
func StringToIPNetHookFunc() DecodeHookFunc { |
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return func( |
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f reflect.Type, |
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147 |
t reflect.Type, |
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data interface{}) (interface{}, error) { |
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if f.Kind() != reflect.String { |
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return data, nil |
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151 |
} |
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if t != reflect.TypeOf(net.IPNet{}) { |
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return data, nil |
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154 |
} |
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||
156 |
// Convert it by parsing |
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157 |
_, net, err := net.ParseCIDR(data.(string)) |
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return net, err |
|
159 |
} |
|
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} |
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161 |
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162 |
// StringToTimeHookFunc returns a DecodeHookFunc that converts |
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163 |
// strings to time.Time. |
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164 |
func StringToTimeHookFunc(layout string) DecodeHookFunc { |
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165 |
return func( |
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166 |
f reflect.Type, |
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167 |
t reflect.Type, |
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168 |
data interface{}) (interface{}, error) { |
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169 |
if f.Kind() != reflect.String { |
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170 |
return data, nil |
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171 |
} |
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172 |
if t != reflect.TypeOf(time.Time{}) { |
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173 |
return data, nil |
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174 |
} |
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175 |
|
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176 |
// Convert it by parsing |
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177 |
return time.Parse(layout, data.(string)) |
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178 |
} |
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179 |
} |
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180 |
|
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181 |
// WeaklyTypedHook is a DecodeHookFunc which adds support for weak typing to |
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182 |
// the decoder. |
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183 |
// |
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184 |
// Note that this is significantly different from the WeaklyTypedInput option |
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185 |
// of the DecoderConfig. |
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186 |
func WeaklyTypedHook( |
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187 |
f reflect.Kind, |
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188 |
t reflect.Kind, |
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189 |
data interface{}) (interface{}, error) { |
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190 |
dataVal := reflect.ValueOf(data) |
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191 |
switch t { |
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192 |
case reflect.String: |
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193 |
switch f { |
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194 |
case reflect.Bool: |
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195 |
if dataVal.Bool() { |
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196 |
return "1", nil |
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197 |
} |
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198 |
return "0", nil |
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199 |
case reflect.Float32: |
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200 |
return strconv.FormatFloat(dataVal.Float(), 'f', -1, 64), nil |
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201 |
case reflect.Int: |
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202 |
return strconv.FormatInt(dataVal.Int(), 10), nil |
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203 |
case reflect.Slice: |
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204 |
dataType := dataVal.Type() |
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205 |
elemKind := dataType.Elem().Kind() |
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206 |
if elemKind == reflect.Uint8 { |
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207 |
return string(dataVal.Interface().([]uint8)), nil |
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208 |
} |
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209 |
case reflect.Uint: |
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210 |
return strconv.FormatUint(dataVal.Uint(), 10), nil |
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211 |
} |
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|
212 |
} |
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|
213 |
|
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|
214 |
return data, nil |
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215 |
} |
256 | 216 |
|
217 |
func RecursiveStructToMapHookFunc() DecodeHookFunc { |
|
218 |
return func(f reflect.Value, t reflect.Value) (interface{}, error) { |
|
219 |
if f.Kind() != reflect.Struct { |
|
220 |
return f.Interface(), nil |
|
221 |
} |
|
222 |
||
223 |
var i interface{} = struct{}{} |
|
224 |
if t.Type() != reflect.TypeOf(&i).Elem() { |
|
225 |
return f.Interface(), nil |
|
226 |
} |
|
227 |
||
228 |
m := make(map[string]interface{}) |
|
229 |
t.Set(reflect.ValueOf(m)) |
|
230 |
||
231 |
return f.Interface(), nil |
|
232 |
} |
|
233 |
} |
|
234 |
||
235 |
// TextUnmarshallerHookFunc returns a DecodeHookFunc that applies |
|
236 |
// strings to the UnmarshalText function, when the target type |
|
237 |
// implements the encoding.TextUnmarshaler interface |
|
238 |
func TextUnmarshallerHookFunc() DecodeHookFuncType { |
|
239 |
return func( |
|
240 |
f reflect.Type, |
|
241 |
t reflect.Type, |
|
242 |
data interface{}) (interface{}, error) { |
|
243 |
if f.Kind() != reflect.String { |
|
244 |
return data, nil |
|
245 |
} |
|
246 |
result := reflect.New(t).Interface() |
|
247 |
unmarshaller, ok := result.(encoding.TextUnmarshaler) |
|
248 |
if !ok { |
|
249 |
return data, nil |
|
250 |
} |
|
251 |
if err := unmarshaller.UnmarshalText([]byte(data.(string))); err != nil { |
|
252 |
return nil, err |
|
253 |
} |
|
254 |
return result, nil |
|
255 |
} |
|
256 |
} |