mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-30 00:11:59 +00:00
231 lines
5.6 KiB
Go
231 lines
5.6 KiB
Go
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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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// UintSlice wraps []int to satisfy flag.Value
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type UintSlice struct {
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slice []uint
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separator separatorSpec
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hasBeenSet bool
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}
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// NewUintSlice makes an *UintSlice with default values
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func NewUintSlice(defaults ...uint) *UintSlice {
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return &UintSlice{slice: append([]uint{}, defaults...)}
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}
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// clone allocate a copy of self object
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func (i *UintSlice) clone() *UintSlice {
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n := &UintSlice{
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slice: make([]uint, len(i.slice)),
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hasBeenSet: i.hasBeenSet,
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}
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copy(n.slice, i.slice)
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return n
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}
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// TODO: Consistently have specific Set function for Int64 and Float64 ?
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// SetInt directly adds an integer to the list of values
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func (i *UintSlice) SetUint(value uint) {
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if !i.hasBeenSet {
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i.slice = []uint{}
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i.hasBeenSet = true
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}
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i.slice = append(i.slice, value)
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}
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// Set parses the value into an integer and appends it to the list of values
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func (i *UintSlice) Set(value string) error {
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if !i.hasBeenSet {
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i.slice = []uint{}
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i.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)), &i.slice)
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i.hasBeenSet = true
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return nil
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}
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for _, s := range i.separator.flagSplitMultiValues(value) {
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tmp, err := strconv.ParseUint(strings.TrimSpace(s), 0, 32)
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if err != nil {
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return err
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}
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i.slice = append(i.slice, uint(tmp))
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}
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return nil
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}
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func (i *UintSlice) WithSeparatorSpec(spec separatorSpec) {
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i.separator = spec
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}
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// String returns a readable representation of this value (for usage defaults)
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func (i *UintSlice) String() string {
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v := i.slice
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if v == nil {
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// treat nil the same as zero length non-nil
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v = make([]uint, 0)
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}
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str := fmt.Sprintf("%d", v)
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str = strings.Replace(str, " ", ", ", -1)
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str = strings.Replace(str, "[", "{", -1)
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str = strings.Replace(str, "]", "}", -1)
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return fmt.Sprintf("[]uint%s", str)
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}
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// Serialize allows UintSlice to fulfill Serializer
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func (i *UintSlice) Serialize() string {
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jsonBytes, _ := json.Marshal(i.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 ints set by this flag
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func (i *UintSlice) Value() []uint {
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return i.slice
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}
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// Get returns the slice of ints set by this flag
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func (i *UintSlice) Get() interface{} {
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return *i
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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 *UintSliceFlag) String() string {
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return FlagStringer(f)
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}
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// TakesValue returns true of the flag takes a value, otherwise false
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func (f *UintSliceFlag) 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 *UintSliceFlag) GetUsage() string {
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return f.Usage
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}
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// GetCategory returns the category for the flag
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func (f *UintSliceFlag) GetCategory() string {
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return f.Category
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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 *UintSliceFlag) GetValue() string {
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var defaultVals []string
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if f.Value != nil && len(f.Value.Value()) > 0 {
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for _, i := range f.Value.Value() {
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defaultVals = append(defaultVals, strconv.FormatUint(uint64(i), 10))
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}
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}
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return strings.Join(defaultVals, ", ")
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}
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// GetDefaultText returns the default text for this flag
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func (f *UintSliceFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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return f.GetValue()
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}
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// GetEnvVars returns the env vars for this flag
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func (f *UintSliceFlag) GetEnvVars() []string {
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return f.EnvVars
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}
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// IsSliceFlag implements DocGenerationSliceFlag.
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func (f *UintSliceFlag) IsSliceFlag() bool {
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return true
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}
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// Apply populates the flag given the flag set and environment
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func (f *UintSliceFlag) Apply(set *flag.FlagSet) error {
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// apply any default
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if f.Destination != nil && f.Value != nil {
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f.Destination.slice = make([]uint, len(f.Value.slice))
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copy(f.Destination.slice, f.Value.slice)
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}
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// resolve setValue (what we will assign to the set)
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var setValue *UintSlice
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switch {
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case f.Destination != nil:
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setValue = f.Destination
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case f.Value != nil:
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setValue = f.Value.clone()
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default:
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setValue = new(UintSlice)
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setValue.WithSeparatorSpec(f.separator)
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}
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if val, source, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok && val != "" {
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for _, s := range f.separator.flagSplitMultiValues(val) {
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if err := setValue.Set(strings.TrimSpace(s)); err != nil {
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return fmt.Errorf("could not parse %q as uint slice value from %s for flag %s: %s", val, source, f.Name, err)
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}
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}
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// Set this to false so that we reset the slice if we then set values from
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// flags that have already been set by the environment.
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setValue.hasBeenSet = false
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f.HasBeenSet = true
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}
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for _, name := range f.Names() {
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set.Var(setValue, name, f.Usage)
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}
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return nil
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}
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func (f *UintSliceFlag) WithSeparatorSpec(spec separatorSpec) {
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f.separator = spec
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}
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// Get returns the flag’s value in the given Context.
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func (f *UintSliceFlag) Get(ctx *Context) []uint {
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return ctx.UintSlice(f.Name)
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}
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// RunAction executes flag action if set
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func (f *UintSliceFlag) RunAction(c *Context) error {
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if f.Action != nil {
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return f.Action(c, c.UintSlice(f.Name))
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}
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return nil
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}
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// UintSlice looks up the value of a local UintSliceFlag, returns
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// nil if not found
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func (cCtx *Context) UintSlice(name string) []uint {
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if fs := cCtx.lookupFlagSet(name); fs != nil {
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return lookupUintSlice(name, fs)
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}
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return nil
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}
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func lookupUintSlice(name string, set *flag.FlagSet) []uint {
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f := set.Lookup(name)
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if f != nil {
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if slice, ok := unwrapFlagValue(f.Value).(*UintSlice); ok {
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return slice.Value()
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}
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}
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return nil
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}
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