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args.go
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args.go
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package args
import (
"flag"
"reflect"
"time"
)
// A represents an argument
type A func(i interface{}) V
// Get returns the value of the argument from the values.
// nil is returned if no value and no default is set for this argument.
func (a A) Get(vals ...interface{}) (val interface{}) {
val = get(a(nil).arg(), vals)
return
}
// IsSet returns whether the argument is set in the values.
func (a A) IsSet(vals ...interface{}) bool {
return isSet(a(nil).arg(), vals)
}
// New creates a new argument.
func New(vals ...V) A {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
panic("cannot set flag for interface{}")
}
return a.getA()
}
// BoolA is a boolean argument.
type BoolA func(b bool) V
// Get returns the value of the int argument among vals.
func (a BoolA) Get(vals ...interface{}) (val bool) {
v := get(a(false).arg(), vals)
switch v := v.(type) {
case *bool:
return *v
case bool:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a BoolA) IsSet(vals ...interface{}) bool {
return isSet(a(false).arg(), vals)
}
// NewBool creates a new integer argument.
func NewBool(vals ...V) BoolA {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Bool(f.name, f.defv.(bool), f.usage)
}
ab := a.getA()
return func(b bool) V {
return ab(b)
}
}
// IntA is an integer argument.
type IntA func(i int) V
// Get returns the value of the int argument among vals.
func (a IntA) Get(vals ...interface{}) (val int) {
v := get(a(0).arg(), vals)
switch v := v.(type) {
case *int:
return *v
case int:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a IntA) IsSet(vals ...interface{}) bool {
return isSet(a(0).arg(), vals)
}
// NewInt creates a new integer argument.
func NewInt(vals ...V) IntA {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Int(f.name, f.defv.(int), f.usage)
}
ai := a.getA()
return func(i int) V {
return ai(i)
}
}
// UintA is an unsigned integer argument.
type UintA func(i uint) V
// Get returns the value of the int argument among vals.
func (a UintA) Get(vals ...interface{}) (val uint) {
v := get(a(0).arg(), vals)
switch v := v.(type) {
case *uint:
return *v
case uint:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a UintA) IsSet(vals ...interface{}) bool {
return isSet(a(0).arg(), vals)
}
// NewUint creates a new integer argument.
func NewUint(vals ...V) UintA {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Uint(f.name, f.defv.(uint), f.usage)
}
ai := a.getA()
return func(i uint) V {
return ai(i)
}
}
// Int64A is a 64-bit integer argument.
type Int64A func(i int64) V
// Get returns the value of the int64 argument among vals.
func (a Int64A) Get(vals ...interface{}) (val int64) {
v := get(a(0).arg(), vals)
switch v := v.(type) {
case *int64:
return *v
case int64:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a Int64A) IsSet(vals ...interface{}) bool {
return isSet(a(0).arg(), vals)
}
// NewInt64 creates a new integer argument.
func NewInt64(vals ...V) Int64A {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Int64(f.name, f.defv.(int64), f.usage)
}
ai := a.getA()
return func(i int64) V {
return ai(i)
}
}
// Uint64A is an unsigned 64-bit integer argument.
type Uint64A func(i uint64) V
// Get returns the value of the uint64 argument among vals.
func (a Uint64A) Get(vals ...interface{}) (val uint64) {
v := get(a(0).arg(), vals)
switch v := v.(type) {
case *uint64:
return *v
case uint64:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a Uint64A) IsSet(vals ...interface{}) bool {
return isSet(a(0).arg(), vals)
}
// NewUint64 creates a new integer argument.
func NewUint64(vals ...V) Uint64A {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Uint64(f.name, f.defv.(uint64), f.usage)
}
ai := a.getA()
return func(i uint64) V {
return ai(i)
}
}
// Float64A is a 64-bit float argument.
type Float64A func(i float64) V
// Get returns the value of the float64 argument among vals.
func (a Float64A) Get(vals ...interface{}) (val float64) {
v := get(a(0).arg(), vals)
switch v := v.(type) {
case *float64:
return *v
case float64:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a Float64A) IsSet(vals ...interface{}) bool {
return isSet(a(0).arg(), vals)
}
// NewFloat64 creates a new integer argument.
func NewFloat64(vals ...V) Float64A {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Float64(f.name, f.defv.(float64), f.usage)
}
af := a.getA()
return func(f float64) V {
return af(f)
}
}
// StringA is a string argument.
type StringA func(s string) V
// Get returns the value of the string argument among vals.
func (a StringA) Get(vals ...interface{}) (val string) {
v := get(a("").arg(), vals)
switch v := v.(type) {
case *string:
return *v
case string:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a StringA) IsSet(vals ...interface{}) bool {
return isSet(a("").arg(), vals)
}
// NewString creates a new integer argument.
func NewString(vals ...V) StringA {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.String(f.name, f.defv.(string), f.usage)
}
as := a.getA()
return func(s string) V {
return as(s)
}
}
// DurationA is a duration argument.
type DurationA func(d time.Duration) V
// Get returns the value of the time.Duration argument among vals.
func (a DurationA) Get(vals ...interface{}) (val time.Duration) {
v := get(a(0).arg(), vals)
switch v := v.(type) {
case *time.Duration:
return *v
case time.Duration:
return v
}
return
}
// IsSet returns whether the argument is set in the values.
func (a DurationA) IsSet(vals ...interface{}) bool {
return isSet(a(0).arg(), vals)
}
// NewDuration creates a new integer argument.
func NewDuration(vals ...V) DurationA {
a := &arg{}
d := Default.Get(vals)
a.defv = d
f := A(flagA).Get(vals)
if f != nil {
f := f.(flagT)
a.defv = flag.Duration(f.name, f.defv.(time.Duration), f.usage)
}
ad := a.getA()
return func(d time.Duration) V {
return ad(d)
}
}
// V represents the value of an argument.
type V interface {
val() interface{}
arg() *arg
}
type argVal struct {
value interface{}
argument *arg
}
func (v argVal) val() interface{} {
return v.value
}
func (v argVal) arg() *arg {
return v.argument
}
func get(arg *arg, vals []interface{}) interface{} {
for i := len(vals) - 1; 0 <= i; i-- {
val := vals[i]
switch reflect.TypeOf(val).Kind() {
case reflect.Slice:
s := reflect.ValueOf(val)
for j := s.Len() - 1; 0 <= j; j-- {
if v, ok := s.Index(j).Interface().(V); ok && arg == v.arg() {
return v.val()
}
}
default:
if v, ok := arg.valueOf(val); ok {
return v
}
}
}
return arg.defv
}
func isSet(arg *arg, vals []interface{}) bool {
for i := len(vals) - 1; 0 <= i; i-- {
val := vals[i]
switch reflect.TypeOf(val).Kind() {
case reflect.Slice:
s := reflect.ValueOf(val)
for j := s.Len() - 1; 0 <= j; j-- {
if v, ok := s.Index(j).Interface().(V); ok && arg == v.arg() {
return true
}
}
default:
if _, ok := arg.valueOf(val); ok {
return true
}
}
}
return false
}
type arg struct {
defv interface{}
}
func (a *arg) valueOf(i interface{}) (val interface{}, ok bool) {
if v, ok := i.(V); ok && a == v.arg() {
return v.val(), true
}
return
}
func (a *arg) getA() A {
return func(i interface{}) V {
return argVal{
value: i,
argument: a,
}
}
}
// Default sets the default value of an argument.
var Default = defArg.getA()
var defArg = &arg{}
// Flag sets the default value of an argument based on a flag.
//
// Note that Flag can only be used in typed New functions (e.g., NewInt(), ...).
// New() will panic if it receives a Flag.
//
// Flag overwrites Default if both passed to an argument.
func Flag(name string, defv interface{}, usage string) V {
return flagA(flagT{
name: name,
defv: defv,
usage: usage,
})
}
var flagA = flagArg.getA()
var flagArg = &arg{}
type flagT struct {
name string // name is the name of the flag.
defv interface{} // defv is the default value of this flag.
usage string // usage is the usage documentation of this flag.
}