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// Copyright 2017 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 (
"fmt"
"strconv"
"strings"
"time"
)
type generic struct {
p interface{}
}
// Flag is shorthand for CommandLine.Flag.
func Flag(v interface{}, short rune, helpvalue ...string) Option {
return CommandLine.long(v, "", short, helpvalue...)
}
// FlagLong is shorthand for CommandLine.LongFlag.
func FlagLong(v interface{}, long string, short rune, helpvalue ...string) Option {
return CommandLine.long(v, long, short, helpvalue...)
}
// Flag calls FlagLong with only a short flag name.
func (s *Set) Flag(v interface{}, short rune, helpvalue ...string) Option {
return s.long(v, "", short, helpvalue...)
}
// FlagLong returns an Option in Set s for setting v. If long is not "" then
// the option has a long name, and if short is not 0, the option has a short
// name. v must either be of type getopt.Value or a pointer to one of the
// supported builtin types:
//
// bool, string, []string
// int, int8, int16, int32, int64
// uint, uint8, uint16, uint32, uint64
// float32, float64
// time.Duration
//
// FlagLong will panic if v is not a getopt.Value or one of the supported
// builtin types.
//
// The default value of the flag is the value of v at the time FlagLong is
// called.
func (s *Set) FlagLong(v interface{}, long string, short rune, helpvalue ...string) Option {
return s.long(v, long, short, helpvalue...)
}
func (s *Set) long(v interface{}, long string, short rune, helpvalue ...string) (opt Option) {
// Fix up our location when we return.
if where := calledFrom(); where != "" {
defer func() {
if opt, ok := opt.(*option); ok {
opt.where = where
}
}()
}
switch p := v.(type) {
case Value:
return s.addFlag(p, long, short, helpvalue...)
case *bool:
return s.addFlag(&generic{v}, long, short, helpvalue...).SetFlag()
case *string, *[]string:
return s.addFlag(&generic{v}, long, short, helpvalue...)
case *int, *int8, *int16, *int32, *int64:
return s.addFlag(&generic{v}, long, short, helpvalue...)
case *uint, *uint8, *uint16, *uint32, *uint64:
return s.addFlag(&generic{v}, long, short, helpvalue...)
case *float32, *float64:
return s.addFlag(&generic{v}, long, short, helpvalue...)
case *time.Duration:
return s.addFlag(&generic{v}, long, short, helpvalue...)
default:
panic(fmt.Sprintf("unsupported flag type: %T", v))
}
}
func (g *generic) Set(value string, opt Option) error {
strconvErr := func(err error) error {
if e, ok := err.(*strconv.NumError); ok {
switch e.Err {
case strconv.ErrRange:
err = fmt.Errorf("value out of range: %s", value)
case strconv.ErrSyntax:
err = fmt.Errorf("not a valid number: %s", value)
}
}
return err
}
switch p := g.p.(type) {
case *bool:
switch strings.ToLower(value) {
case "", "1", "true", "on", "t":
*p = true
case "0", "false", "off", "f":
*p = false
default:
return fmt.Errorf("invalid value for bool %s: %q", opt.Name(), value)
}
return nil
case *string:
*p = value
return nil
case *[]string:
a := strings.Split(value, ",")
// If this is the first time we are seen then nil out the
// default value.
if opt.Count() <= 1 {
*p = nil
}
*p = append(*p, a...)
return nil
case *int:
i64, err := strconv.ParseInt(value, 0, strconv.IntSize)
if err == nil {
*p = int(i64)
}
return strconvErr(err)
case *int8:
i64, err := strconv.ParseInt(value, 0, 8)
if err == nil {
*p = int8(i64)
}
return strconvErr(err)
case *int16:
i64, err := strconv.ParseInt(value, 0, 16)
if err == nil {
*p = int16(i64)
}
return strconvErr(err)
case *int32:
i64, err := strconv.ParseInt(value, 0, 32)
if err == nil {
*p = int32(i64)
}
return strconvErr(err)
case *int64:
i64, err := strconv.ParseInt(value, 0, 64)
if err == nil {
*p = i64
}
return strconvErr(err)
case *uint:
u64, err := strconv.ParseUint(value, 0, strconv.IntSize)
if err == nil {
*p = uint(u64)
}
return strconvErr(err)
case *uint8:
u64, err := strconv.ParseUint(value, 0, 8)
if err == nil {
*p = uint8(u64)
}
return strconvErr(err)
case *uint16:
u64, err := strconv.ParseUint(value, 0, 16)
if err == nil {
*p = uint16(u64)
}
return strconvErr(err)
case *uint32:
u64, err := strconv.ParseUint(value, 0, 32)
if err == nil {
*p = uint32(u64)
}
return strconvErr(err)
case *uint64:
u64, err := strconv.ParseUint(value, 0, 64)
if err == nil {
*p = u64
}
return strconvErr(err)
case *float32:
f64, err := strconv.ParseFloat(value, 32)
if err == nil {
*p = float32(f64)
}
return strconvErr(err)
case *float64:
f64, err := strconv.ParseFloat(value, 64)
if err == nil {
*p = f64
}
return strconvErr(err)
case *time.Duration:
v, err := time.ParseDuration(value)
if err == nil {
*p = v
}
return err
}
panic("internal error")
}
func (g *generic) String() string {
switch p := g.p.(type) {
case *bool:
if *p {
return "true"
}
return "false"
case *string:
return *p
case *[]string:
return strings.Join([]string(*p), ",")
case *int:
return strconv.FormatInt(int64(*p), 10)
case *int8:
return strconv.FormatInt(int64(*p), 10)
case *int16:
return strconv.FormatInt(int64(*p), 10)
case *int32:
return strconv.FormatInt(int64(*p), 10)
case *int64:
return strconv.FormatInt(*p, 10)
case *uint:
return strconv.FormatUint(uint64(*p), 10)
case *uint8:
return strconv.FormatUint(uint64(*p), 10)
case *uint16:
return strconv.FormatUint(uint64(*p), 10)
case *uint32:
return strconv.FormatUint(uint64(*p), 10)
case *uint64:
return strconv.FormatUint(*p, 10)
case *float32:
return strconv.FormatFloat(float64(*p), 'g', -1, 32)
case *float64:
return strconv.FormatFloat(*p, 'g', -1, 64)
case *time.Duration:
return p.String()
}
panic("internal error")
}
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