1package pflag 2 3import ( 4 "bytes" 5 "encoding/csv" 6 "fmt" 7 "strings" 8) 9 10// -- stringToString Value 11type stringToStringValue struct { 12 value *map[string]string 13 changed bool 14} 15 16func newStringToStringValue(val map[string]string, p *map[string]string) *stringToStringValue { 17 ssv := new(stringToStringValue) 18 ssv.value = p 19 *ssv.value = val 20 return ssv 21} 22 23// Format: a=1,b=2 24func (s *stringToStringValue) Set(val string) error { 25 var ss []string 26 n := strings.Count(val, "=") 27 switch n { 28 case 0: 29 return fmt.Errorf("%s must be formatted as key=value", val) 30 case 1: 31 ss = append(ss, strings.Trim(val, `"`)) 32 default: 33 r := csv.NewReader(strings.NewReader(val)) 34 var err error 35 ss, err = r.Read() 36 if err != nil { 37 return err 38 } 39 } 40 41 out := make(map[string]string, len(ss)) 42 for _, pair := range ss { 43 kv := strings.SplitN(pair, "=", 2) 44 if len(kv) != 2 { 45 return fmt.Errorf("%s must be formatted as key=value", pair) 46 } 47 out[kv[0]] = kv[1] 48 } 49 if !s.changed { 50 *s.value = out 51 } else { 52 for k, v := range out { 53 (*s.value)[k] = v 54 } 55 } 56 s.changed = true 57 return nil 58} 59 60func (s *stringToStringValue) Type() string { 61 return "stringToString" 62} 63 64func (s *stringToStringValue) String() string { 65 records := make([]string, 0, len(*s.value)>>1) 66 for k, v := range *s.value { 67 records = append(records, k+"="+v) 68 } 69 70 var buf bytes.Buffer 71 w := csv.NewWriter(&buf) 72 if err := w.Write(records); err != nil { 73 panic(err) 74 } 75 w.Flush() 76 return "[" + strings.TrimSpace(buf.String()) + "]" 77} 78 79func stringToStringConv(val string) (interface{}, error) { 80 val = strings.Trim(val, "[]") 81 // An empty string would cause an empty map 82 if len(val) == 0 { 83 return map[string]string{}, nil 84 } 85 r := csv.NewReader(strings.NewReader(val)) 86 ss, err := r.Read() 87 if err != nil { 88 return nil, err 89 } 90 out := make(map[string]string, len(ss)) 91 for _, pair := range ss { 92 kv := strings.SplitN(pair, "=", 2) 93 if len(kv) != 2 { 94 return nil, fmt.Errorf("%s must be formatted as key=value", pair) 95 } 96 out[kv[0]] = kv[1] 97 } 98 return out, nil 99} 100 101// GetStringToString return the map[string]string value of a flag with the given name 102func (f *FlagSet) GetStringToString(name string) (map[string]string, error) { 103 val, err := f.getFlagType(name, "stringToString", stringToStringConv) 104 if err != nil { 105 return map[string]string{}, err 106 } 107 return val.(map[string]string), nil 108} 109 110// StringToStringVar defines a string flag with specified name, default value, and usage string. 111// The argument p points to a map[string]string variable in which to store the values of the multiple flags. 112// The value of each argument will not try to be separated by comma 113func (f *FlagSet) StringToStringVar(p *map[string]string, name string, value map[string]string, usage string) { 114 f.VarP(newStringToStringValue(value, p), name, "", usage) 115} 116 117// StringToStringVarP is like StringToStringVar, but accepts a shorthand letter that can be used after a single dash. 118func (f *FlagSet) StringToStringVarP(p *map[string]string, name, shorthand string, value map[string]string, usage string) { 119 f.VarP(newStringToStringValue(value, p), name, shorthand, usage) 120} 121 122// StringToStringVar defines a string flag with specified name, default value, and usage string. 123// The argument p points to a map[string]string variable in which to store the value of the flag. 124// The value of each argument will not try to be separated by comma 125func StringToStringVar(p *map[string]string, name string, value map[string]string, usage string) { 126 CommandLine.VarP(newStringToStringValue(value, p), name, "", usage) 127} 128 129// StringToStringVarP is like StringToStringVar, but accepts a shorthand letter that can be used after a single dash. 130func StringToStringVarP(p *map[string]string, name, shorthand string, value map[string]string, usage string) { 131 CommandLine.VarP(newStringToStringValue(value, p), name, shorthand, usage) 132} 133 134// StringToString defines a string flag with specified name, default value, and usage string. 135// The return value is the address of a map[string]string variable that stores the value of the flag. 136// The value of each argument will not try to be separated by comma 137func (f *FlagSet) StringToString(name string, value map[string]string, usage string) *map[string]string { 138 p := map[string]string{} 139 f.StringToStringVarP(&p, name, "", value, usage) 140 return &p 141} 142 143// StringToStringP is like StringToString, but accepts a shorthand letter that can be used after a single dash. 144func (f *FlagSet) StringToStringP(name, shorthand string, value map[string]string, usage string) *map[string]string { 145 p := map[string]string{} 146 f.StringToStringVarP(&p, name, shorthand, value, usage) 147 return &p 148} 149 150// StringToString defines a string flag with specified name, default value, and usage string. 151// The return value is the address of a map[string]string variable that stores the value of the flag. 152// The value of each argument will not try to be separated by comma 153func StringToString(name string, value map[string]string, usage string) *map[string]string { 154 return CommandLine.StringToStringP(name, "", value, usage) 155} 156 157// StringToStringP is like StringToString, but accepts a shorthand letter that can be used after a single dash. 158func StringToStringP(name, shorthand string, value map[string]string, usage string) *map[string]string { 159 return CommandLine.StringToStringP(name, shorthand, value, usage) 160} 161