1package pflag 2 3import ( 4 "fmt" 5 "net" 6 "strings" 7) 8 9// IPNet adapts net.IPNet for use as a flag. 10type ipNetValue net.IPNet 11 12func (ipnet ipNetValue) String() string { 13 n := net.IPNet(ipnet) 14 return n.String() 15} 16 17func (ipnet *ipNetValue) Set(value string) error { 18 _, n, err := net.ParseCIDR(strings.TrimSpace(value)) 19 if err != nil { 20 return err 21 } 22 *ipnet = ipNetValue(*n) 23 return nil 24} 25 26func (*ipNetValue) Type() string { 27 return "ipNet" 28} 29 30func newIPNetValue(val net.IPNet, p *net.IPNet) *ipNetValue { 31 *p = val 32 return (*ipNetValue)(p) 33} 34 35func ipNetConv(sval string) (interface{}, error) { 36 _, n, err := net.ParseCIDR(strings.TrimSpace(sval)) 37 if err == nil { 38 return *n, nil 39 } 40 return nil, fmt.Errorf("invalid string being converted to IPNet: %s", sval) 41} 42 43// GetIPNet return the net.IPNet value of a flag with the given name 44func (f *FlagSet) GetIPNet(name string) (net.IPNet, error) { 45 val, err := f.getFlagType(name, "ipNet", ipNetConv) 46 if err != nil { 47 return net.IPNet{}, err 48 } 49 return val.(net.IPNet), nil 50} 51 52// IPNetVar defines an net.IPNet flag with specified name, default value, and usage string. 53// The argument p points to an net.IPNet variable in which to store the value of the flag. 54func (f *FlagSet) IPNetVar(p *net.IPNet, name string, value net.IPNet, usage string) { 55 f.VarP(newIPNetValue(value, p), name, "", usage) 56} 57 58// IPNetVarP is like IPNetVar, but accepts a shorthand letter that can be used after a single dash. 59func (f *FlagSet) IPNetVarP(p *net.IPNet, name, shorthand string, value net.IPNet, usage string) { 60 f.VarP(newIPNetValue(value, p), name, shorthand, usage) 61} 62 63// IPNetVar defines an net.IPNet flag with specified name, default value, and usage string. 64// The argument p points to an net.IPNet variable in which to store the value of the flag. 65func IPNetVar(p *net.IPNet, name string, value net.IPNet, usage string) { 66 CommandLine.VarP(newIPNetValue(value, p), name, "", usage) 67} 68 69// IPNetVarP is like IPNetVar, but accepts a shorthand letter that can be used after a single dash. 70func IPNetVarP(p *net.IPNet, name, shorthand string, value net.IPNet, usage string) { 71 CommandLine.VarP(newIPNetValue(value, p), name, shorthand, usage) 72} 73 74// IPNet defines an net.IPNet flag with specified name, default value, and usage string. 75// The return value is the address of an net.IPNet variable that stores the value of the flag. 76func (f *FlagSet) IPNet(name string, value net.IPNet, usage string) *net.IPNet { 77 p := new(net.IPNet) 78 f.IPNetVarP(p, name, "", value, usage) 79 return p 80} 81 82// IPNetP is like IPNet, but accepts a shorthand letter that can be used after a single dash. 83func (f *FlagSet) IPNetP(name, shorthand string, value net.IPNet, usage string) *net.IPNet { 84 p := new(net.IPNet) 85 f.IPNetVarP(p, name, shorthand, value, usage) 86 return p 87} 88 89// IPNet defines an net.IPNet flag with specified name, default value, and usage string. 90// The return value is the address of an net.IPNet variable that stores the value of the flag. 91func IPNet(name string, value net.IPNet, usage string) *net.IPNet { 92 return CommandLine.IPNetP(name, "", value, usage) 93} 94 95// IPNetP is like IPNet, but accepts a shorthand letter that can be used after a single dash. 96func IPNetP(name, shorthand string, value net.IPNet, usage string) *net.IPNet { 97 return CommandLine.IPNetP(name, shorthand, value, usage) 98} 99