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range.go
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range.go
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package app
import (
"context"
"net/url"
"reflect"
"sort"
"github.com/maxence-charriere/go-app/v7/pkg/errors"
)
// RangeLoop represents a control structure that iterates within a slice, an
// array or a map.
type RangeLoop interface {
UI
// Slice sets the loop content by repeating the given function for the
// number of elements in the source.
//
// It panics if the range source is not a slice or an array.
Slice(f func(int) UI) RangeLoop
// Map sets the loop content by repeating the given function for the number
// of elements in the source. Elements are ordered by keys.
//
// It panics if the range source is not a map or if map keys are not strings.
Map(f func(string) UI) RangeLoop
}
// Range returns a range loop that iterates within the given source. Source must
// be a slice, an array or a map with strings as keys.
func Range(src interface{}) RangeLoop {
return rangeLoop{source: src}
}
type rangeLoop struct {
body []UI
source interface{}
}
func (r rangeLoop) Slice(f func(int) UI) RangeLoop {
src := reflect.ValueOf(r.source)
if src.Kind() != reflect.Slice && src.Kind() != reflect.Array {
panic(errors.New("range loop source is not a slice or array").
Tag("src-type", src.Type),
)
}
body := make([]UI, 0, src.Len())
for i := 0; i < src.Len(); i++ {
body = append(body, FilterUIElems(f(i))...)
}
r.body = body
return r
}
func (r rangeLoop) Map(f func(string) UI) RangeLoop {
src := reflect.ValueOf(r.source)
if src.Kind() != reflect.Map {
panic(errors.New("range loop source is not a map").
Tag("src-type", src.Type),
)
}
if keyType := src.Type().Key(); keyType.Kind() != reflect.String {
panic(errors.New("range loop source keys are not strings").
Tag("src-type", src.Type).
Tag("key-type", keyType),
)
}
body := make([]UI, 0, src.Len())
keys := make([]string, 0, src.Len())
for _, k := range src.MapKeys() {
keys = append(keys, k.String())
}
sort.Strings(keys)
for _, k := range keys {
body = append(body, FilterUIElems(f(k))...)
}
r.body = body
return r
}
func (r rangeLoop) Kind() Kind {
return Selector
}
func (r rangeLoop) JSValue() Value {
return nil
}
func (r rangeLoop) Mounted() bool {
return false
}
func (r rangeLoop) name() string {
return "range"
}
func (r rangeLoop) self() UI {
return r
}
func (r rangeLoop) setSelf(UI) {
}
func (r rangeLoop) context() context.Context {
return nil
}
func (r rangeLoop) attributes() map[string]string {
return nil
}
func (r rangeLoop) eventHandlers() map[string]eventHandler {
return nil
}
func (r rangeLoop) parent() UI {
return nil
}
func (r rangeLoop) setParent(UI) {
}
func (r rangeLoop) children() []UI {
return r.body
}
func (r rangeLoop) mount() error {
return errors.New("range loop is not mountable").
Tag("name", r.name()).
Tag("kind", r.Kind())
}
func (r rangeLoop) dismount() {
}
func (r rangeLoop) update(UI) error {
return errors.New("range loop cannot be updated").
Tag("name", r.name()).
Tag("kind", r.Kind())
}
func (r rangeLoop) onNav(*url.URL) {
}