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sprintf.go
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/
sprintf.go
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package binding
import (
"fmt"
"fyne.io/fyne/v2/storage"
)
type sprintfString struct {
String
format string
source []DataItem
err error
}
// NewSprintf returns a String binding that format its content using the
// format string and the provide additional parameter that must be other
// data bindings. This data binding use fmt.Sprintf and fmt.Scanf internally
// and will have all the same limitation as those function.
//
// Since: 2.2
func NewSprintf(format string, b ...DataItem) String {
ret := &sprintfString{
String: NewString(),
format: format,
source: append(make([]DataItem, 0, len(b)), b...),
}
for _, value := range b {
value.AddListener(ret)
}
return ret
}
func (s *sprintfString) DataChanged() {
data := make([]interface{}, 0, len(s.source))
s.err = nil
for _, value := range s.source {
switch x := value.(type) {
case Bool:
b, err := x.Get()
if err != nil {
s.err = err
return
}
data = append(data, b)
case Bytes:
b, err := x.Get()
if err != nil {
s.err = err
return
}
data = append(data, b)
case Float:
f, err := x.Get()
if err != nil {
s.err = err
return
}
data = append(data, f)
case Int:
i, err := x.Get()
if err != nil {
s.err = err
return
}
data = append(data, i)
case Rune:
r, err := x.Get()
if err != nil {
s.err = err
return
}
data = append(data, r)
case String:
str, err := x.Get()
if err != nil {
s.err = err
// Set error?
return
}
data = append(data, str)
case URI:
u, err := x.Get()
if err != nil {
s.err = err
return
}
data = append(data, u)
}
}
r := fmt.Sprintf(s.format, data...)
s.String.Set(r)
}
func (s *sprintfString) Get() (string, error) {
if s.err != nil {
return "", s.err
}
return s.String.Get()
}
func (s *sprintfString) Set(str string) error {
data := make([]interface{}, 0, len(s.source))
s.err = nil
for _, value := range s.source {
switch value.(type) {
case Bool:
data = append(data, new(bool))
case Bytes:
return fmt.Errorf("impossible to convert '%s' to []bytes type", str)
case Float:
data = append(data, new(float64))
case Int:
data = append(data, new(int))
case Rune:
data = append(data, new(rune))
case String:
data = append(data, new(string))
case URI:
data = append(data, new(string))
}
}
count, err := fmt.Sscanf(str, s.format, data...)
if err != nil {
return err
}
if count != len(data) {
return fmt.Errorf("impossible to decode more than %v parameters in '%s' with format '%s'", count, str, s.format)
}
for i, value := range s.source {
switch x := value.(type) {
case Bool:
v := data[i].(*bool)
err := x.Set(*v)
if err != nil {
return err
}
case Bytes:
return fmt.Errorf("impossible to convert '%s' to []bytes type", str)
case Float:
v := data[i].(*float64)
err := x.Set(*v)
if err != nil {
return err
}
case Int:
v := data[i].(*int)
err := x.Set(*v)
if err != nil {
return err
}
case Rune:
v := data[i].(*rune)
err := x.Set(*v)
if err != nil {
return err
}
case String:
v := data[i].(*string)
err := x.Set(*v)
if err != nil {
return err
}
case URI:
v := data[i].(*string)
if v == nil {
return fmt.Errorf("URI can not be nil in '%s'", str)
}
uri, err := storage.ParseURI(*v)
if err != nil {
return err
}
err = x.Set(uri)
if err != nil {
return err
}
}
}
return nil
}
// StringToStringWithFormat creates a binding that converts a string to another string using the specified format.
// Changes to the returned String will be pushed to the passed in String and setting a new string value will parse and
// set the underlying String if it matches the format and the parse was successful.
//
// Since: 2.2
func StringToStringWithFormat(str String, format string) String {
if format == "%s" { // Same as not using custom formatting.
return str
}
return NewSprintf(format, str)
}