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emitter.go
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emitter.go
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package events
import (
"reflect"
"github.com/kmcsr/goja"
)
type listenerI interface{
caller()(goja.Callable)
listener()(goja.Callable)
}
type gojaCallable goja.Callable
var _ listenerI = (gojaCallable)(nil)
func (c gojaCallable)caller()(goja.Callable){
return (goja.Callable)(c)
}
func (c gojaCallable)listener()(goja.Callable){
return (goja.Callable)(c)
}
type gojaCallableOnce struct{
c goja.Callable
l goja.Callable
}
var _ listenerI = (*gojaCallableOnce)(nil)
func newGojaCallableOnce(e *EventEmitter, event string, call goja.Callable)(c *gojaCallableOnce){
c = &gojaCallableOnce{
c: func(this goja.Value, args ...goja.Value)(res goja.Value, err error){
e.removeListener(event, c.c)
return c.l(this, args...)
},
l: call,
}
return
}
func (c *gojaCallableOnce)caller()(goja.Callable){
return c.c
}
func (c *gojaCallableOnce)listener()(goja.Callable){
return c.c
}
type EventEmitter struct{
runtime *goja.Runtime
events map[string][]listenerI
inerror bool
}
func NewEventEmitter(runtime *goja.Runtime)(e *EventEmitter){
e = &EventEmitter{
runtime: runtime,
events: make(map[string][]listenerI),
}
return
}
func (e *EventEmitter)ToObject()(*goja.Object){
return e.runtime.ToValue(e).(*goja.Object)
}
func (e *EventEmitter)emit(vm *goja.Runtime, event string, values ...any)(ok bool){
calls := e.events[event]
if len(calls) == 0 {
return false
}
vals := castToJsValues(vm, values)
for _, c := range calls {
if _, err := c.caller()(nil, vals...); err != nil {
if e.inerror {
panic("Error in error handle")
}
e.inerror = true
e.emit(vm, "error", vm.ToValue(err))
}
}
return
}
func (e *EventEmitter)Emit(event string, values ...any)(ok bool){
return e.emit(e.runtime, event, values...)
}
func (e *EventEmitter)EmitAsync(event string, values ...any)(*EventEmitter){
e.runtime.RunOnLoop(func(vm *goja.Runtime)(error){
e.emit(vm, event, values...)
return nil
})
return e
}
func (e *EventEmitter)addListener(event string, listener listenerI){
e.events[event] = append(e.events[event], listener)
}
func (e *EventEmitter)prependListener(event string, listener listenerI){
hd1 := e.events[event]
hd2 := make([]listenerI, len(hd1) + 1)
hd2[0] = listener
copy(hd2[1:], hd1)
e.events[event] = hd2
}
func (e *EventEmitter)AddListener(event string, listener goja.Callable)(*EventEmitter){
e.addListener(event, (gojaCallable)(listener))
return e
}
func (e *EventEmitter)On(event string, listener goja.Callable)(*EventEmitter){
e.AddListener(event, listener)
return e
}
func (e *EventEmitter)Once(event string, listener goja.Callable)(*EventEmitter){
e.addListener(event, newGojaCallableOnce(e, event, listener))
return e
}
func (e *EventEmitter)PrependListener(event string, listener goja.Callable)(*EventEmitter){
e.prependListener(event, (gojaCallable)(listener))
return e
}
func (e *EventEmitter)PrependOnceListener(event string, listener goja.Callable)(*EventEmitter){
e.prependListener(event, newGojaCallableOnce(e, event, listener))
return e
}
func (e *EventEmitter)removeListener(event string, listener goja.Callable){
if calls, ok := e.events[event]; ok {
hp := reflect.ValueOf(listener).Pointer()
for i := len(calls) - 1; i >= 0; i-- {
if reflect.ValueOf(calls[i].caller()).Pointer() == hp ||
reflect.ValueOf(calls[i].listener()).Pointer() == hp {
copy(calls[i:], calls[i + 1:])
e.events[event] = calls[:len(calls) - 1]
break
}
}
}
}
func (e *EventEmitter)RemoveListener(event string, listener goja.Callable)(*EventEmitter){
e.removeListener(event, listener)
return e
}
func (e *EventEmitter)RemoveListenerAsync(event string, listener goja.Callable){
e.runtime.DoSync(func()(error){
e.removeListener(event, listener)
return nil
})
}
func (e *EventEmitter)removeAllListeners(event string){
if _, ok := e.events[event]; ok {
delete(e.events, event)
}
}
func (e *EventEmitter)RemoveAllListeners(event string){
e.runtime.DoSync(func()(error){
e.removeAllListeners(event)
return nil
})
}
func (e *EventEmitter)Off(event string, handler goja.Callable){
e.RemoveListener(event, handler)
}
func (e *EventEmitter)EventNames()(names []string){
names = make([]string, 0, len(e.events))
for n, _ := range e.events {
names = append(names, n)
}
return
}
func (e *EventEmitter)Listeners(event string)(handlers []goja.Callable){
hds := e.events[event]
handlers = make([]goja.Callable, 0, len(hds))
for _, c := range hds {
handlers = append(handlers, c.listener())
}
return
}
func castToJsValues(vm *goja.Runtime, values []any)(vals []goja.Value){
vals = make([]goja.Value, len(values))
for i, v := range values {
vals[i] = vm.ToValue(v)
}
return
}