neoneo-go/cli/flags/address.go

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package flags
import (
"flag"
"fmt"
"strings"
"github.com/nspcc-dev/neo-go/pkg/encoding/address"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/urfave/cli"
)
// Address is a wrapper for Uint160 with flag.Value methods.
type Address struct {
IsSet bool
Value util.Uint160
}
// AddressFlag is a flag with type string
type AddressFlag struct {
Name string
Usage string
Value Address
}
var (
_ flag.Value = (*Address)(nil)
_ cli.Flag = AddressFlag{}
)
// String implements fmt.Stringer interface.
func (a Address) String() string {
return address.Uint160ToString(a.Value)
}
// Set implements flag.Value interface.
func (a *Address) Set(s string) error {
addr, err := ParseAddress(s)
if err != nil {
return cli.NewExitError(err, 1)
}
a.IsSet = true
a.Value = addr
return nil
}
// Uint160 casts address to Uint160.
func (a *Address) Uint160() (u util.Uint160) {
if !a.IsSet {
// It is a programmer error to call this method without
// checking if the value was provided.
panic("address was not set")
}
return a.Value
}
// IsSet checks if flag was set to a non-default value.
func (f AddressFlag) IsSet() bool {
return f.Value.IsSet
}
// String returns a readable representation of this value
// (for usage defaults)
func (f AddressFlag) String() string {
var names []string
eachName(f.Name, func(name string) {
names = append(names, getNameHelp(name))
})
return strings.Join(names, ", ") + "\t" + f.Usage
}
func getNameHelp(name string) string {
if len(name) == 1 {
return fmt.Sprintf("-%s value", name)
}
return fmt.Sprintf("--%s value", name)
}
// GetName returns the name of the flag
func (f AddressFlag) GetName() string {
return f.Name
}
// Apply populates the flag given the flag set and environment
// Ignores errors
func (f AddressFlag) Apply(set *flag.FlagSet) {
eachName(f.Name, func(name string) {
set.Var(&f.Value, name, f.Usage)
})
}
// ParseAddress parses Uint160 form either LE string or address.
func ParseAddress(s string) (util.Uint160, error) {
const uint160size = 2 * util.Uint160Size
switch len(s) {
case uint160size, uint160size + 2:
return util.Uint160DecodeStringLE(strings.TrimPrefix(s, "0x"))
default:
return address.StringToUint160(s)
}
}