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