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package duktape
import (
"errors"
"fmt"
"time"
)
// DefineTimers defines `setTimeout`, `clearTimeout`, `setInterval`,
// `clearInterval` into global context.
func (d *Context) PushTimers() error {
d.PushGlobalStash()
// check if timers already exists
if !d.HasPropString(-1, "timers") {
d.PushObject()
d.PutPropString(-2, "timers") // stash -> [ timers:{} ]
d.Pop()
d.PushGlobalGoFunction("setTimeout", setTimeout)
d.PushGlobalGoFunction("setInterval", setInterval)
d.PushGlobalGoFunction("clearTimeout", clearTimeout)
d.PushGlobalGoFunction("clearInterval", clearTimeout)
return nil
} else {
d.Pop()
return errors.New("Timers are already defined")
}
}
func (d *Context) FlushTimers() {
d.PushGlobalStash()
d.PushObject()
d.PutPropString(-2, "timers") // stash -> [ timers:{} ]
d.Pop()
}
func setTimeout(c *Context) int {
id := c.pushTimer(0)
timeout := c.ToNumber(1)
if timeout < 1 {
timeout = 1
}
go func(id float64) {
<-time.After(time.Duration(timeout) * time.Millisecond)
c.Lock()
defer c.Unlock()
if c.duk_context == nil {
fmt.Println("[duktape] Warning!\nsetTimeout invokes callback after the context was destroyed.")
return
}
// check if timer still exists
c.putTimer(id)
if c.GetType(-1).IsObject() {
c.Pcall(0 /* nargs */)
}
c.dropTimer(id)
}(id)
c.PushNumber(id)
return 1
}
func clearTimeout(c *Context) int {
if c.GetType(0).IsNumber() {
c.dropTimer(c.GetNumber(0))
c.Pop()
}
return 0
}
func setInterval(c *Context) int {
id := c.pushTimer(0)
timeout := c.ToNumber(1)
if timeout < 1 {
timeout = 1
}
go func(id float64) {
ticker := time.NewTicker(time.Duration(timeout) * time.Millisecond)
for _ = range ticker.C {
c.Lock()
// check if duktape context exists
if c.duk_context == nil {
c.dropTimer(id)
c.Pop()
ticker.Stop()
fmt.Println("[duktape] Warning!\nsetInterval invokes callback after the context was destroyed.")
c.Unlock()
continue
}
// check if timer still exists
c.putTimer(id)
if c.GetType(-1).IsObject() {
c.Pcall(0 /* nargs */)
c.Pop()
} else {
c.dropTimer(id)
c.Pop()
ticker.Stop()
}
c.Unlock()
}
}(id)
c.PushNumber(id)
return 1
}
func (d *Context) pushTimer(index int) float64 {
id := d.timerIndex.get()
d.PushGlobalStash()
d.GetPropString(-1, "timers")
d.PushNumber(id)
d.Dup(index)
d.PutProp(-3)
d.Pop2()
return id
}
func (d *Context) dropTimer(id float64) {
d.PushGlobalStash()
d.GetPropString(-1, "timers")
d.PushNumber(id)
d.DelProp(-2)
d.Pop2()
}
func (d *Context) putTimer(id float64) {
d.PushGlobalStash() // stash -> [ ..., timers: { <id>: { func: true } } ]
d.GetPropString(-1, "timers") // stash -> [ ..., timers: { <id>: { func: true } } }, { <id>: { func: true } ]
d.PushNumber(id)
d.GetProp(-2) // stash -> [ ..., timers: { <id>: { func: true } } }, { <id>: { func: true }, { func: true } ]
d.Replace(-3)
d.Pop()
}
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