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# mauflag
[![Build Status](http://img.shields.io/travis/tulir293/mauflag.svg?style=flat-square)](https://travis-ci.org/tulir293/mauflag)
[![License](http://img.shields.io/:license-gpl3-blue.svg?style=flat-square)](http://www.gnu.org/licenses/gpl-3.0.html)
An extendable argument parser for Golang. Mostly follows the GNU [Program Argument Syntax Conventions](https://www.gnu.org/software/libc/manual/html_node/Argument-Syntax.html).
Use `go get maunium.net/go/mauflag` to get this package
## Basic usage
A flag can have as many long or short keys as you like. Short keys are prefixed with one dash (`-`) whilst long keys are prefixed with two (`--`)
To create a flag, you must first call the `Make()` method in a flagset. Calling flagset methods as package functions uses the default flagset which takes input arguments from `os.Args`
After creating a flag, you can call the functions it has as you like. After configuring the flag, you can call one of the type functions to set the flag type and get a pointer to the value.
### Examples
Here's a basic string flag that can be set using `-s` or `--my-string-flag`
```go
var myStringFlag = flag.Make().ShortKey("s").LongKey("my-string-flag").Default("a string").String()
```
The following input arguments would set the value of the flag to `foo`
* `-s`, `foo`
* `-s=foo`
* `-sfoo`
* `--my-string-flag`, `foo`
* `--my-string-flag=foo`
#### Chaining
Short boolean flags can be chained. The last flag of a chain doesn't necessarily have to be a boolean flag.
For example, if we had the following flags defined
```go
var boolA = flag.Make().ShortKey("a").Bool()
var boolB = flag.Make().ShortKey("b").Bool()
var boolC = flag.Make().ShortKey("c").Bool()
var stringD = flag.Make().ShortKey("d").String()
```
We could set the values of all the boolean flags to true with one input argument: `-abc`. We could also add the `d` flag to the end like so: `-abcd`, `foo`.
Any of the other ways to set short flags also work (`-abcd=foo`, `-abcdfoo`).
However, if you put `d` as the first flag (`-dabc`) the value of the `d` flag will be `abc` and none of the boolean flags would change.
### Godoc
More docs, including all values supported by default, can be found from [godoc.org/maunium.net/go/mauflag](https://godoc.org/maunium.net/go/mauflag)
## Custom values
All value containers must implement the `Value` interface. It contains two functions:
* `Set(string)` which is called whenever the parser finds a value associated with the flag.
* `Name()` which should return a human-readable name for the type of the value. If the value container contains multiple actual values, `Name()` should return the name of a single object (e.g. `integer` if the value container contains multiple integers)
After creating a value container you can use it by calling the `Custom` method of a `Flag` and giving an instance of the value container. The parser will then call the `Set` method each time it encounters a value associated with the flag.

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// mauflag - An extendable command-line argument parser for Golang
// Copyright (C) 2016 Maunium
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package mauflag
import (
"os"
)
var defaultSet = New(os.Args[1:])
// DefaultSet returns the default flagset which takes its arguments from os.Args
func DefaultSet() *Set {
return defaultSet
}
// Make creates and registers a flag
func Make() *Flag {
return DefaultSet().Make()
}
// MakeKey creates and registers a flag with the given short and long keys
func MakeKey(short, long string) *Flag {
return DefaultSet().MakeKey(short, long)
}
// MakeFull creates and registers a flag with the given short and long keys, usage string and default value
func MakeFull(short, long, usage, defVal string) *Flag {
return DefaultSet().MakeFull(short, long, usage, defVal)
}
// Parse the command line arguments into mauflag form
func Parse() error {
return DefaultSet().Parse()
}
// Args returns the arguments that weren't associated with any flag
func Args() []string {
return DefaultSet().Args()
}
// Arg returns the string at the given index from the list Args() returns
// If the index does not exist, Arg will return an empty string.
func Arg(i int) string {
return DefaultSet().Arg(i)
}
// NArg returns the number of arguments not associated with any flags
func NArg() int {
return len(DefaultSet().args)
}
// MakeHelpFlag creates the -h, --help flag
func MakeHelpFlag() (*bool, *Flag) {
return DefaultSet().MakeHelpFlag()
}
// CheckHelpFlag checks if the help flag is set and prints the help page if needed.
// Return value tells whether or not the help page was printed
func CheckHelpFlag() bool {
return DefaultSet().CheckHelpFlag()
}
// SetHelpTitles sets the first line (program name and basic explanation) and basic usage specification
func SetHelpTitles(firstLine, basicUsage string) {
DefaultSet().SetHelpTitles(firstLine, basicUsage)
}
// PrintHelp prints the help page
func PrintHelp() {
DefaultSet().PrintHelp()
}

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// mauflag - An extendable command-line argument parser for Golang
// Copyright (C) 2016 Maunium
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package mauflag
// Flag represents a single flag
type Flag struct {
longKeys []string
shortKeys []string
Value Value
defaul string
usage string
usageCat string
usageValName string
}
// Make creates and registers a flag
func (fs *Set) Make() *Flag {
flag := &Flag{}
val := stringValue("")
flag.Value = &val
flag.usageCat = "Application"
flag.activateDefaultValue()
fs.flags = append(fs.flags, flag)
return flag
}
// MakeKey creates and registers a flag with the given short and long keys
func (fs *Set) MakeKey(short, long string) *Flag {
return fs.Make().Key(short, long)
}
// MakeFull creates and registers a flag with the given short and long keys, usage string and default value
func (fs *Set) MakeFull(short, long, usage, defVal string) *Flag {
return fs.MakeKey(short, long).Usage(usage).Default(defVal)
}
func (flag *Flag) setValue(val string) error {
return flag.Value.Set(val)
}
// Usage sets the usage of this Flag
func (flag *Flag) Usage(usage string) *Flag {
flag.usage = usage
return flag
}
// UsageCategory sets the category of this flag (e.g. Application or Help)
func (flag *Flag) UsageCategory(category string) *Flag {
flag.usageCat = category
return flag
}
// ValueName sets the value name in the usage page
func (flag *Flag) ValueName(valname string) *Flag {
flag.usageValName = valname
return flag
}
// Default sets the default value of this Flag
// The value given is passed to the Value container of this flag using `Set()`
func (flag *Flag) Default(defaul string) *Flag {
flag.defaul = defaul
flag.activateDefaultValue()
return flag
}
func (flag *Flag) activateDefaultValue() {
if len(flag.defaul) > 0 && flag.Value != nil {
flag.Value.Set(flag.defaul)
}
}
// LongKey adds a long key to this Flag
func (flag *Flag) LongKey(key string) *Flag {
flag.longKeys = append(flag.longKeys, key)
return flag
}
// ShortKey adds a short key to this Flag
func (flag *Flag) ShortKey(key string) *Flag {
flag.shortKeys = append(flag.shortKeys, key)
return flag
}
// Key adds a long and a short key to this Flag
func (flag *Flag) Key(short, long string) *Flag {
return flag.ShortKey(short).LongKey(long)
}
// Custom sets a custom object that implemets Value as the value of this flag
func (flag *Flag) Custom(val Value) {
flag.Value = val
flag.activateDefaultValue()
}
// Bool sets the type of this flag to a boolean and returns a pointer to the value
func (flag *Flag) Bool() *bool {
val := boolValue(false)
flag.Value = &val
flag.activateDefaultValue()
return (*bool)(&val)
}
// String sets the type of this flag to a string and returns a pointer to the value
func (flag *Flag) String() *string {
val := stringValue("")
flag.Value = &val
flag.activateDefaultValue()
return (*string)(&val)
}
// StringMap sets the type of this flag to a string-string map and returns a pointer to the value
func (flag *Flag) StringMap() *map[string]string {
val := ssMapValue{}
flag.Value = &val
flag.activateDefaultValue()
return (*map[string]string)(&val)
}
// StringArray sets the type of this flag to a string array and returns a pointer to the value
func (flag *Flag) StringArray() *[]string {
val := stringArrayValue{}
flag.Value = &val
flag.activateDefaultValue()
return (*[]string)(&val)
}
// IntArray sets the type of this flag to a signed default-length integer array and returns a pointer to the value
func (flag *Flag) IntArray() *[]int {
val := intArrayValue{}
flag.Value = &val
flag.activateDefaultValue()
return (*[]int)(&val)
}
// Int64Array sets the type of this flag to a signed 64-bit integer array and returns a pointer to the value
func (flag *Flag) Int64Array() *[]int64 {
val := int64ArrayValue{}
flag.Value = &val
flag.activateDefaultValue()
return (*[]int64)(&val)
}
// Int sets the type of this flag to a signed default-length integer and returns a pointer to the value
func (flag *Flag) Int() *int {
val := intValue(0)
flag.Value = &val
flag.activateDefaultValue()
return (*int)(&val)
}
// Uint sets the type of this flag to an unsigned default-length integer and returns a pointer to the value
func (flag *Flag) Uint() *uint {
val := uintValue(0)
flag.Value = &val
flag.activateDefaultValue()
return (*uint)(&val)
}
// Int8 sets the type of this flag to a signed 8-bit integer and returns a pointer to the value
func (flag *Flag) Int8() *int8 {
val := int8Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*int8)(&val)
}
// Uint8 sets the type of this flag to an unsigned 8-bit integer and returns a pointer to the value
func (flag *Flag) Uint8() *uint8 {
val := uint8Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*uint8)(&val)
}
// Byte sets the type of this flag to a byte (unsigned 8-bit integer) and returns a pointer to the value
func (flag *Flag) Byte() *byte {
val := byteValue(0)
flag.Value = &val
flag.activateDefaultValue()
return (*byte)(&val)
}
// Int16 sets the type of this flag to a signed 16-bit integer and returns a pointer to the value
func (flag *Flag) Int16() *int16 {
val := int16Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*int16)(&val)
}
// Uint16 sets the type of this flag to an unsigned 16-bit integer and returns a pointer to the value
func (flag *Flag) Uint16() *uint16 {
val := uint16Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*uint16)(&val)
}
// Int32 sets the type of this flag to a signed 32-bit integer and returns a pointer to the value
func (flag *Flag) Int32() *int32 {
val := int32Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*int32)(&val)
}
// Rune sets the type of this flag to a rune (signed 32-bit integer) and returns a pointer to the value
func (flag *Flag) Rune() *rune {
val := runeValue(0)
flag.Value = &val
flag.activateDefaultValue()
return (*rune)(&val)
}
// Uint32 sets the type of this flag to an unsigned 32-bit integer and returns a pointer to the value
func (flag *Flag) Uint32() *uint32 {
val := uint32Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*uint32)(&val)
}
// Int64 sets the type of this flag to a signed 64-bit integer and returns a pointer to the value
func (flag *Flag) Int64() *int64 {
val := int64Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*int64)(&val)
}
// Uint64 sets the type of this flag to an unsigned 64-bit integer and returns a pointer to the value
func (flag *Flag) Uint64() *uint64 {
val := uint64Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*uint64)(&val)
}
// Float32 sets the type of this flag to an 32-bit float and returns a pointer to the value
func (flag *Flag) Float32() *float32 {
val := float32Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*float32)(&val)
}
// Float64 sets the type of this flag to an 64-bit float and returns a pointer to the value
func (flag *Flag) Float64() *float64 {
val := float64Value(0)
flag.Value = &val
flag.activateDefaultValue()
return (*float64)(&val)
}

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// mauflag - An extendable command-line argument parser for Golang
// Copyright (C) 2016 Maunium
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package mauflag
import (
"fmt"
"os"
"strings"
)
// Set is a set of flags with certain input arguments
type Set struct {
// The list of strings used as input
InputArgs []string
// Whether or not to ignore all flags after the user has entered two dashes with no flag key ("--")
// If enabled, all arguments after two dashes with no flag key will go into the args array (@see Args())
DoubleLineEscape bool
// Whether or not to exit the program when there's an error
// If enabled, the error message will be printed to `stderr` after which `os.Exit(1)` will be called.
ExitOnError bool
wantHelp *bool
basicUsage string
helpFirstLine string
args []string
flags []*Flag
}
// New creates a new flagset
func New(args []string) *Set {
return &Set{InputArgs: args, DoubleLineEscape: true, ExitOnError: false}
}
// Args returns the arguments that weren't associated with any flag
func (fs *Set) Args() []string {
return fs.args
}
// Arg returns the string at the given index from the list Args() returns
// If the index does not exist, Arg will return an empty string.
func (fs *Set) Arg(i int) string {
if len(fs.args) <= i {
return ""
}
return fs.args[i]
}
// NArg returns the number of arguments not associated with any flags
func (fs *Set) NArg() int {
return len(fs.args)
}
// MakeHelpFlag creates the -h, --help flag
func (fs *Set) MakeHelpFlag() (*bool, *Flag) {
var flag = fs.Make().Key("h", "help").Usage("Show this help page.").UsageCategory("Help")
fs.wantHelp = flag.Bool()
return fs.wantHelp, flag
}
// CheckHelpFlag checks if the help flag is set and prints the help page if needed.
// Return value tells whether or not the help page was printed
func (fs *Set) CheckHelpFlag() bool {
if fs.wantHelp != nil && *fs.wantHelp {
fs.PrintHelp()
return true
}
return false
}
// SetHelpTitles sets the first line (program name and basic explanation) and basic usage specification
func (fs *Set) SetHelpTitles(firstLine, basicUsage string) {
fs.helpFirstLine = firstLine
fs.basicUsage = basicUsage
}
// PrintHelp prints the help page
func (fs *Set) PrintHelp() {
var helpSectNames = make(map[string]int)
var helpSectIndexes = make(map[int]string)
var helpSects = make([][]*Flag, 0)
for _, flag := range fs.flags {
index, ok := helpSectNames[flag.usageCat]
if !ok {
arr := []*Flag{flag}
helpSects = append(helpSects, arr)
helpSectNames[flag.usageCat] = len(helpSects) - 1
helpSectIndexes[len(helpSects)-1] = flag.usageCat
} else {
helpSects[index] = append(helpSects[index], flag)
}
}
data, maxLen := fs.formatFlagHelp(helpSects)
fmt.Printf(`%s
Usage:
%s
`, fs.helpFirstLine, fs.basicUsage)
for sect, sData := range data {
fmt.Print(helpSectIndexes[sect], " options:\n")
for i, fData := range sData {
fmt.Print(fData, strings.Repeat(" ", maxLen-len(fData)+3), helpSects[sect][i].usage, "\n")
}
fmt.Print("\n")
}
}
func (fs *Set) formatFlagHelp(helpSects [][]*Flag) (data [][]string, maxLen int) {
maxLen = 0
data = make([][]string, len(helpSects))
for sect, flags := range helpSects {
var sData = make([]string, len(flags))
for i, flag := range flags {
var fData = []string{" "}
for _, key := range flag.shortKeys {
fData = append(fData, "-")
fData = append(fData, key)
fData = append(fData, ", ")
}
for _, key := range flag.longKeys {
fData = append(fData, "--")
fData = append(fData, key)
if len(flag.usageValName) > 0 {
fData = append(fData, "=")
fData = append(fData, flag.usageValName)
}
fData = append(fData, ", ")
}
if fData[len(fData)-1] == ", " {
fData = fData[:len(fData)-1]
}
sData[i] = strings.Join(fData, "")
if len(sData[i]) > maxLen {
maxLen = len(sData[i])
}
}
data[sect] = sData
}
return
}
func (fs *Set) err(format string, args ...interface{}) error {
if fs.ExitOnError {
fmt.Fprintf(os.Stderr, format, args...)
fmt.Fprint(os.Stderr, "\n")
os.Exit(1)
return nil
}
return fmt.Errorf(format, args...)
}
// Parse the input arguments in this flagset into mauflag form
// Before this function is called all the flags will have either the type default or the given default value
func (fs *Set) Parse() error {
var flag *Flag
var key string
var noMoreFlags = false
for _, arg := range fs.InputArgs {
if noMoreFlags {
fs.args = append(fs.args, arg)
} else if arg == "--" && fs.DoubleLineEscape {
noMoreFlags = true
} else if flag != nil {
err := flag.setValue(arg)
if err != nil {
return fs.err("Flag %s was not a %s", key, flag.Value.Name())
}
flag = nil
} else if arg[0] == '-' && len(arg) > 1 {
arg = strings.ToLower(arg)
var err error
flag, key, err = fs.flagFound(arg[1:])
if err != nil {
return err
}
} else {
fs.args = append(fs.args, arg)
}
}
return nil
}
func (fs *Set) flagFound(arg string) (flag *Flag, key string, err error) {
key = arg
var val string
if strings.ContainsRune(key, '=') {
val = key[strings.Index(key, "=")+1:]
key = key[:strings.Index(key, "=")]
}
var rem string
flag, key, rem = fs.getFlag(key)
flag, key, rem, err = fs.handleFlag(flag, key, rem, val)
if len(rem) > 0 {
return fs.flagFound(rem)
}
return
}
func (fs *Set) handleFlag(flag *Flag, key, rem, val string) (*Flag, string, string, error) {
var err error
var isBool bool
if flag != nil {
_, isBool = flag.Value.(*boolValue)
}
if flag == nil {
err = fs.err("Unknown flag: %s", key)
} else if len(val) > 0 && len(rem) == 0 {
flag.setValue(val)
} else if isBool {
flag.setValue("true")
} else if len(rem) > 0 {
flag.setValue(rem)
rem = ""
} else {
return flag, key, rem, err
}
return nil, "", rem, err
}
func (fs *Set) getFlag(key string) (*Flag, string, string) {
if key[0] == '-' {
key = key[1:]
for _, lflag := range fs.flags {
for _, lkey := range lflag.longKeys {
if lkey == key {
return lflag, lkey, ""
}
}
}
return nil, key, ""
}
rem := key[1:]
key = key[0:1]
for _, lflag := range fs.flags {
for _, lkey := range lflag.shortKeys {
if lkey == key {
return lflag, lkey, rem
}
}
}
return nil, key, rem
}

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// mauflag - An extendable command-line argument parser for Golang
// Copyright (C) 2016 Maunium
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package mauflag
import (
"errors"
"strconv"
"strings"
)
// Value represents the value a flag has
type Value interface {
// Set or add the data in the given string to this value
Set(string) error
// Name should return the type name of this value or (if this value is an array,
// a map or something of that sort) the type name of one object in this value
Name() string
}
type boolValue bool
func (val *boolValue) Name() string {
return "boolean"
}
func (val *boolValue) Set(newVal string) error {
b, err := strconv.ParseBool(newVal)
if err == nil {
*val = boolValue(b)
}
return err
}
type stringValue string
func (val *stringValue) Name() string {
return "string"
}
func (val *stringValue) Set(newVal string) error {
*val = stringValue(newVal)
return nil
}
type ssMapValue map[string]string
func (val *ssMapValue) Name() string {
return "string-string pair"
}
func (val *ssMapValue) Set(newVal string) error {
index := strings.IndexRune(newVal, '=')
if index == -1 {
index = strings.IndexRune(newVal, ',')
if index == -1 {
index = strings.IndexRune(newVal, ':')
if index == -1 {
return errors.New("No pair separator found")
}
}
}
(*val)[newVal[:index]] = newVal[:index+1]
return nil
}
type stringArrayValue []string
func (val *stringArrayValue) Name() string {
return "string"
}
func (val *stringArrayValue) Set(newVal string) error {
*val = append(*val, newVal)
return nil
}
type intArrayValue []int
func (val *intArrayValue) Name() string {
return "integer"
}
func (val *intArrayValue) Set(newVal string) error {
i, err := strconv.Atoi(newVal)
if err != nil {
return err
}
*val = append(*val, i)
return nil
}
type int64ArrayValue []int64
func (val *int64ArrayValue) Name() string {
return "64-bit integer"
}
func (val *int64ArrayValue) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 64)
if err != nil {
return err
}
*val = append(*val, i)
return nil
}
type intValue int
func (val *intValue) Name() string {
return "integer"
}
func (val *intValue) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 32)
if err == nil {
*val = intValue(i)
}
return err
}
type uintValue uint
func (val *uintValue) Name() string {
return "unsigned integer"
}
func (val *uintValue) Set(newVal string) error {
i, err := strconv.ParseUint(newVal, 10, 32)
if err == nil {
*val = uintValue(i)
}
return err
}
type int8Value int8
func (val *int8Value) Name() string {
return "8-bit integer"
}
func (val *int8Value) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 8)
if err == nil {
*val = int8Value(i)
}
return err
}
type uint8Value uint8
func (val *uint8Value) Name() string {
return "unsigned 8-bit integer"
}
func (val *uint8Value) Set(newVal string) error {
i, err := strconv.ParseUint(newVal, 10, 8)
if err == nil {
*val = uint8Value(i)
}
return err
}
type byteValue byte
func (val *byteValue) Name() string {
return "rune (unsigned 8-bit integer)"
}
func (val *byteValue) Set(newVal string) error {
i, err := strconv.ParseUint(newVal, 10, 8)
if err == nil {
*val = byteValue(i)
}
return err
}
type int16Value int16
func (val *int16Value) Name() string {
return "16-bit integer"
}
func (val *int16Value) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 16)
if err == nil {
*val = int16Value(i)
}
return err
}
type uint16Value uint16
func (val *uint16Value) Name() string {
return "unsigned 16-bit integer"
}
func (val *uint16Value) Set(newVal string) error {
i, err := strconv.ParseUint(newVal, 10, 16)
if err == nil {
*val = uint16Value(i)
}
return err
}
type int32Value int32
func (val *int32Value) Name() string {
return "32-bit integer"
}
func (val *int32Value) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 32)
if err == nil {
*val = int32Value(i)
}
return err
}
type runeValue rune
func (val *runeValue) Name() string {
return "rune (signed 32-bit integer)"
}
func (val *runeValue) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 32)
if err == nil {
*val = runeValue(i)
}
return err
}
type uint32Value uint32
func (val *uint32Value) Name() string {
return "unsigned 32-bit integer"
}
func (val *uint32Value) Set(newVal string) error {
i, err := strconv.ParseUint(newVal, 10, 32)
if err == nil {
*val = uint32Value(i)
}
return err
}
type int64Value int64
func (val *int64Value) Name() string {
return "64-bit integer"
}
func (val *int64Value) Set(newVal string) error {
i, err := strconv.ParseInt(newVal, 10, 64)
if err == nil {
*val = int64Value(i)
}
return err
}
type uint64Value uint64
func (val *uint64Value) Name() string {
return "unsigned 64-bit integer"
}
func (val *uint64Value) Set(newVal string) error {
i, err := strconv.ParseUint(newVal, 10, 64)
if err == nil {
*val = uint64Value(i)
}
return err
}
type float32Value float32
func (val *float32Value) Name() string {
return "32-bit float"
}
func (val *float32Value) Set(newVal string) error {
i, err := strconv.ParseFloat(newVal, 32)
if err == nil {
*val = float32Value(i)
}
return err
}
type float64Value float64
func (val *float64Value) Name() string {
return "64-bit float"
}
func (val *float64Value) Set(newVal string) error {
i, err := strconv.ParseFloat(newVal, 64)
if err == nil {
*val = float64Value(i)
}
return err
}