Noah Petherbridge
35d96b714d
* Add example mischievous doodad script that alters the logger date format and animates its canvas's mask color.
105 lines
2.1 KiB
Go
105 lines
2.1 KiB
Go
package scripting
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import (
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"fmt"
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"git.kirsle.net/apps/doodle/lib/render"
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"git.kirsle.net/apps/doodle/pkg/log"
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"github.com/robertkrimen/otto"
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)
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// VM manages a single isolated JavaScript VM.
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type VM struct {
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Name string
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// Globals available to the scripts.
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Events *Events
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Self interface{}
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vm *otto.Otto
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// setTimeout and setInterval variables.
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timerLastID int // becomes 1 when first timer is set
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timers map[int]*Timer
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}
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// NewVM creates a new JavaScript VM.
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func NewVM(name string) *VM {
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vm := &VM{
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Name: name,
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Events: NewEvents(),
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vm: otto.New(),
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timers: map[int]*Timer{},
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}
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return vm
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}
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// Run code in the VM.
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func (vm *VM) Run(src interface{}) (otto.Value, error) {
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v, err := vm.vm.Run(src)
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return v, err
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}
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// Set a value in the VM.
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func (vm *VM) Set(name string, v interface{}) error {
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return vm.vm.Set(name, v)
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}
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// RegisterLevelHooks registers accessors to the level hooks
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// and Doodad API for Play Mode.
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func (vm *VM) RegisterLevelHooks() error {
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bindings := map[string]interface{}{
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"log": log.Logger,
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"RGBA": render.RGBA,
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"Point": render.NewPoint,
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"Self": vm.Self, // i.e., the uix.Actor object
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"Events": vm.Events,
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// Timer functions with APIs similar to the web browsers.
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"setTimeout": vm.SetTimeout,
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"setInterval": vm.SetInterval,
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"clearTimeout": vm.ClearTimer,
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"clearInterval": vm.ClearTimer,
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}
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for name, v := range bindings {
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err := vm.vm.Set(name, v)
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if err != nil {
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return fmt.Errorf("RegisterLevelHooks(%s): %s",
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name, err,
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)
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}
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}
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// Alias the console.log functions to the logger.
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vm.vm.Run(`
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console = {};
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console.log = log.Info;
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console.debug = log.Debug;
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console.warn = log.Warn;
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console.error = log.Error;
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`)
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return nil
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}
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// Main calls the main function of the script.
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func (vm *VM) Main() error {
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function, err := vm.vm.Get("main")
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if err != nil {
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return err
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}
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if !function.IsFunction() {
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return nil
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}
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// Catch panics.
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defer func() {
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if err := recover(); err != nil {
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log.Error("Panic caught in JavaScript VM: %s", err)
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}
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}()
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_, err = function.Call(otto.Value{})
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return err
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}
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