48 lines
929 B
Go
48 lines
929 B
Go
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package ns1
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import (
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"fmt"
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"strings"
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)
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type StringEnum struct {
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ValueMap map[string]int
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Expecting string
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}
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func NewStringEnum(values []string) *StringEnum {
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valueMap := make(map[string]int)
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quoted := make([]string, len(values), len(values))
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for i, value := range values {
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_, present := valueMap[value]
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if present {
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panic(fmt.Sprintf("duplicate value %q", value))
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}
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valueMap[value] = i
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quoted[i] = fmt.Sprintf("%q", value)
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}
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return &StringEnum{
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ValueMap: valueMap,
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Expecting: strings.Join(quoted, ", "),
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}
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}
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func (se *StringEnum) Check(v string) (int, error) {
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i, present := se.ValueMap[v]
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if present {
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return i, nil
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} else {
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return -1, fmt.Errorf("expecting one of %s; got %q", se.Expecting, v)
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}
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}
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func (se *StringEnum) ValidateFunc(v interface{}, k string) (ws []string, es []error) {
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_, err := se.Check(v.(string))
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if err != nil {
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return nil, []error{err}
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}
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return nil, nil
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}
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