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string_choice.go
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/
string_choice.go
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package eflags
import (
"errors"
)
type stringChoiceValue struct {
options []string
value *string
}
//////////////////////////////////////////////////////////////////////////////
// implement the Value interface
func (scv *stringChoiceValue) Type() string {
return "stringChoice"
}
func (scv *stringChoiceValue) Value() string {
return *scv.value
}
func (scv *stringChoiceValue) String() string {
return *scv.value
}
func (scv *stringChoiceValue) Set(val string) error {
if nil == scv.value {
return errors.New("StringChoiceValue::Set(): nil value")
}
for _,c := range scv.options {
if val == c {
*scv.value = val
}
}
return nil
}
//////////////////////////////////////////////////////////////////////////////
func NewStringChoiceValue(valp *string, defval string, choices []string) *stringChoiceValue {
if nil == valp {
var v string
return &stringChoiceValue{value: &v}
}
scv := &stringChoiceValue{value: valp, options:choices}
*scv.value=defval // !
return scv
}