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// Copyright 2013 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package getopt
import "errors"
type enumValue string
var enumValues = make(map[*enumValue]map[string]struct{})
func (s *enumValue) Set(value string, opt Option) error {
es, ok := enumValues[s]
if !ok || es == nil {
return errors.New("this option has no values")
}
if _, ok := es[value]; !ok {
return errors.New("invalid value: " + value)
}
*s = enumValue(value)
return nil
}
func (s *enumValue) String() string {
return string(*s)
}
// Enum creates an option that can only be set to one of the enumerated strings
// passed in values. Passing nil or an empty slice results in an option that
// will always fail.
func Enum(name rune, values []string, helpvalue ...string) *string {
return CommandLine.Enum(name, values, helpvalue...)
}
func (s *Set) Enum(name rune, values []string, helpvalue ...string) *string {
var p string
s.EnumVarLong(&p, "", name, values, helpvalue...)
return &p
}
func EnumLong(name string, short rune, values []string, helpvalue ...string) *string {
return CommandLine.EnumLong(name, short, values, helpvalue...)
}
func (s *Set) EnumLong(name string, short rune, values []string, helpvalue ...string) *string {
var p string
s.EnumVarLong(&p, name, short, values, helpvalue...)
return &p
}
// EnumVar creates an enum option that defaults to the starting value of *p.
// If *p is not found in values then a reset of this option will fail.
func EnumVar(p *string, name rune, values []string, helpvalue ...string) Option {
return CommandLine.EnumVar(p, name, values, helpvalue...)
}
func (s *Set) EnumVar(p *string, name rune, values []string, helpvalue ...string) Option {
return s.EnumVarLong(p, "", name, values, helpvalue...)
}
func EnumVarLong(p *string, name string, short rune, values []string, helpvalue ...string) Option {
return CommandLine.EnumVarLong(p, name, short, values, helpvalue...)
}
func (s *Set) EnumVarLong(p *string, name string, short rune, values []string, helpvalue ...string) Option {
m := make(map[string]struct{})
for _, v := range values {
m[v] = struct{}{}
}
enumValues[(*enumValue)(p)] = m
return s.VarLong((*enumValue)(p), name, short, helpvalue...)
}
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