idun/vendor/github.com/urfave/cli/v2/flag_string_slice.go

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2023-10-12 08:20:53 +00:00
package cli
import (
"encoding/json"
"flag"
"fmt"
"strconv"
"strings"
)
// StringSlice wraps a []string to satisfy flag.Value
type StringSlice struct {
slice []string
separator separatorSpec
hasBeenSet bool
keepSpace bool
}
// NewStringSlice creates a *StringSlice with default values
func NewStringSlice(defaults ...string) *StringSlice {
return &StringSlice{slice: append([]string{}, defaults...)}
}
// clone allocate a copy of self object
func (s *StringSlice) clone() *StringSlice {
n := &StringSlice{
slice: make([]string, len(s.slice)),
hasBeenSet: s.hasBeenSet,
}
copy(n.slice, s.slice)
return n
}
// Set appends the string value to the list of values
func (s *StringSlice) Set(value string) error {
if !s.hasBeenSet {
s.slice = []string{}
s.hasBeenSet = true
}
if strings.HasPrefix(value, slPfx) {
// Deserializing assumes overwrite
_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &s.slice)
s.hasBeenSet = true
return nil
}
for _, t := range s.separator.flagSplitMultiValues(value) {
if !s.keepSpace {
t = strings.TrimSpace(t)
}
s.slice = append(s.slice, t)
}
return nil
}
func (s *StringSlice) WithSeparatorSpec(spec separatorSpec) {
s.separator = spec
}
// String returns a readable representation of this value (for usage defaults)
func (s *StringSlice) String() string {
return fmt.Sprintf("%s", s.slice)
}
// Serialize allows StringSlice to fulfill Serializer
func (s *StringSlice) Serialize() string {
jsonBytes, _ := json.Marshal(s.slice)
return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
}
// Value returns the slice of strings set by this flag
func (s *StringSlice) Value() []string {
return s.slice
}
// Get returns the slice of strings set by this flag
func (s *StringSlice) Get() interface{} {
return *s
}
// String returns a readable representation of this value
// (for usage defaults)
func (f *StringSliceFlag) String() string {
return FlagStringer(f)
}
// TakesValue returns true of the flag takes a value, otherwise false
func (f *StringSliceFlag) TakesValue() bool {
return true
}
// GetUsage returns the usage string for the flag
func (f *StringSliceFlag) GetUsage() string {
return f.Usage
}
// GetCategory returns the category for the flag
func (f *StringSliceFlag) GetCategory() string {
return f.Category
}
// GetValue returns the flags value as string representation and an empty
// string if the flag takes no value at all.
func (f *StringSliceFlag) GetValue() string {
var defaultVals []string
if f.Value != nil && len(f.Value.Value()) > 0 {
for _, s := range f.Value.Value() {
if len(s) > 0 {
defaultVals = append(defaultVals, strconv.Quote(s))
}
}
}
return strings.Join(defaultVals, ", ")
}
// GetDefaultText returns the default text for this flag
func (f *StringSliceFlag) GetDefaultText() string {
if f.DefaultText != "" {
return f.DefaultText
}
return f.GetValue()
}
// GetEnvVars returns the env vars for this flag
func (f *StringSliceFlag) GetEnvVars() []string {
return f.EnvVars
}
// IsSliceFlag implements DocGenerationSliceFlag.
func (f *StringSliceFlag) IsSliceFlag() bool {
return true
}
// Apply populates the flag given the flag set and environment
func (f *StringSliceFlag) Apply(set *flag.FlagSet) error {
// apply any default
if f.Destination != nil && f.Value != nil {
f.Destination.slice = make([]string, len(f.Value.slice))
copy(f.Destination.slice, f.Value.slice)
}
// resolve setValue (what we will assign to the set)
var setValue *StringSlice
switch {
case f.Destination != nil:
setValue = f.Destination
case f.Value != nil:
setValue = f.Value.clone()
default:
setValue = new(StringSlice)
setValue.WithSeparatorSpec(f.separator)
}
setValue.keepSpace = f.KeepSpace
if val, source, found := flagFromEnvOrFile(f.EnvVars, f.FilePath); found {
for _, s := range f.separator.flagSplitMultiValues(val) {
if !f.KeepSpace {
s = strings.TrimSpace(s)
}
if err := setValue.Set(s); err != nil {
return fmt.Errorf("could not parse %q as string value from %s for flag %s: %s", val, source, f.Name, err)
}
}
// Set this to false so that we reset the slice if we then set values from
// flags that have already been set by the environment.
setValue.hasBeenSet = false
f.HasBeenSet = true
}
for _, name := range f.Names() {
set.Var(setValue, name, f.Usage)
}
return nil
}
func (f *StringSliceFlag) WithSeparatorSpec(spec separatorSpec) {
f.separator = spec
}
// Get returns the flags value in the given Context.
func (f *StringSliceFlag) Get(ctx *Context) []string {
return ctx.StringSlice(f.Name)
}
// RunAction executes flag action if set
func (f *StringSliceFlag) RunAction(c *Context) error {
if f.Action != nil {
return f.Action(c, c.StringSlice(f.Name))
}
return nil
}
// StringSlice looks up the value of a local StringSliceFlag, returns
// nil if not found
func (cCtx *Context) StringSlice(name string) []string {
if fs := cCtx.lookupFlagSet(name); fs != nil {
return lookupStringSlice(name, fs)
}
return nil
}
func lookupStringSlice(name string, set *flag.FlagSet) []string {
f := set.Lookup(name)
if f != nil {
if slice, ok := unwrapFlagValue(f.Value).(*StringSlice); ok {
return slice.Value()
}
}
return nil
}