166 lines
3.8 KiB
Go
166 lines
3.8 KiB
Go
package cli
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import (
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"encoding/json"
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"flag"
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"fmt"
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"strconv"
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"strings"
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)
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// Float64Slice wraps []float64 to satisfy flag.Value
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type Float64Slice struct {
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slice []float64
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hasBeenSet bool
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}
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// NewFloat64Slice makes a *Float64Slice with default values
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func NewFloat64Slice(defaults ...float64) *Float64Slice {
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return &Float64Slice{slice: append([]float64{}, defaults...)}
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}
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// Set parses the value into a float64 and appends it to the list of values
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func (f *Float64Slice) Set(value string) error {
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if !f.hasBeenSet {
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f.slice = []float64{}
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f.hasBeenSet = true
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}
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if strings.HasPrefix(value, slPfx) {
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// Deserializing assumes overwrite
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_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &f.slice)
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f.hasBeenSet = true
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return nil
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}
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tmp, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return err
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}
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f.slice = append(f.slice, tmp)
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return nil
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}
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// String returns a readable representation of this value (for usage defaults)
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func (f *Float64Slice) String() string {
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return fmt.Sprintf("%#v", f.slice)
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}
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// Serialize allows Float64Slice to fulfill Serializer
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func (f *Float64Slice) Serialize() string {
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jsonBytes, _ := json.Marshal(f.slice)
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return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
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}
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// Value returns the slice of float64s set by this flag
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func (f *Float64Slice) Value() []float64 {
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return f.slice
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}
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// Get returns the slice of float64s set by this flag
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func (f *Float64Slice) Get() interface{} {
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return *f
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}
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// Float64SliceFlag is a flag with type *Float64Slice
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type Float64SliceFlag struct {
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Name string
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Aliases []string
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Usage string
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EnvVars []string
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FilePath string
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Required bool
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Hidden bool
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Value *Float64Slice
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DefaultText string
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HasBeenSet bool
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}
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// IsSet returns whether or not the flag has been set through env or file
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func (f *Float64SliceFlag) IsSet() bool {
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return f.HasBeenSet
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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 *Float64SliceFlag) String() string {
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return FlagStringer(f)
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}
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// Names returns the names of the flag
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func (f *Float64SliceFlag) Names() []string {
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return flagNames(f)
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}
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// IsRequired returns whether or not the flag is required
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func (f *Float64SliceFlag) IsRequired() bool {
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return f.Required
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}
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// TakesValue returns true if the flag takes a value, otherwise false
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func (f *Float64SliceFlag) TakesValue() bool {
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return true
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}
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// GetUsage returns the usage string for the flag
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func (f *Float64SliceFlag) GetUsage() string {
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return f.Usage
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}
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// GetValue returns the flags value as string representation and an empty
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// string if the flag takes no value at all.
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func (f *Float64SliceFlag) GetValue() string {
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if f.Value != nil {
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return f.Value.String()
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}
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return ""
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}
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// Apply populates the flag given the flag set and environment
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func (f *Float64SliceFlag) Apply(set *flag.FlagSet) error {
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if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
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if val != "" {
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f.Value = &Float64Slice{}
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for _, s := range strings.Split(val, ",") {
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if err := f.Value.Set(strings.TrimSpace(s)); err != nil {
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return fmt.Errorf("could not parse %q as float64 slice value for flag %s: %s", f.Value, f.Name, err)
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}
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}
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f.HasBeenSet = true
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}
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}
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for _, name := range f.Names() {
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if f.Value == nil {
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f.Value = &Float64Slice{}
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}
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set.Var(f.Value, name, f.Usage)
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}
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return nil
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}
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// Float64Slice looks up the value of a local Float64SliceFlag, returns
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// nil if not found
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func (c *Context) Float64Slice(name string) []float64 {
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if fs := lookupFlagSet(name, c); fs != nil {
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return lookupFloat64Slice(name, fs)
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}
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return nil
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}
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func lookupFloat64Slice(name string, set *flag.FlagSet) []float64 {
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f := set.Lookup(name)
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if f != nil {
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parsed, err := (f.Value.(*Float64Slice)).Value(), error(nil)
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if err != nil {
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return nil
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}
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return parsed
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}
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return nil
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}
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