doodle/pkg/scripting/vm.go
Noah Petherbridge 1e80304061 Initial Doodad JavaScript System
* Add the JavaScript system for Doodads to run their scripts in levels,
  and wire initial OnCollide() handler support.
* CLI: Add a `doodad install-script` command to the doodad tool.
  * Usage: `doodad install-script <index.js> <filename.doodad>`
* Add dev-assets folder for storing source files for the official
  default doodads, sprites, levels, etc. and for now add a JavaScript
  for the first test doodad.
2019-04-15 23:07:40 -07:00

80 lines
1.5 KiB
Go

package scripting
import (
"errors"
"fmt"
"git.kirsle.net/apps/doodle/lib/render"
"git.kirsle.net/apps/doodle/pkg/log"
"github.com/robertkrimen/otto"
)
// VM manages a single isolated JavaScript VM.
type VM struct {
Name string
// Globals available to the scripts.
Events *Events
Self interface{}
vm *otto.Otto
}
// NewVM creates a new JavaScript VM.
func NewVM(name string) *VM {
vm := &VM{
Name: name,
Events: NewEvents(),
vm: otto.New(),
}
return vm
}
// Run code in the VM.
func (vm *VM) Run(src interface{}) (otto.Value, error) {
v, err := vm.vm.Run(src)
return v, err
}
// Set a value in the VM.
func (vm *VM) Set(name string, v interface{}) error {
return vm.vm.Set(name, v)
}
// RegisterLevelHooks registers accessors to the level hooks
// and Doodad API for Play Mode.
func (vm *VM) RegisterLevelHooks() error {
bindings := map[string]interface{}{
"log": log.Logger,
"RGBA": render.RGBA,
"Point": render.NewPoint,
"Self": vm.Self,
"Events": vm.Events,
}
for name, v := range bindings {
err := vm.vm.Set(name, v)
if err != nil {
return fmt.Errorf("RegisterLevelHooks(%s): %s",
name, err,
)
}
}
vm.vm.Run(`console = {}; console.log = log.Info;`)
return nil
}
// Main calls the main function of the script.
func (vm *VM) Main() error {
function, err := vm.vm.Get("main")
if err != nil {
return err
}
if !function.IsFunction() {
return errors.New("main is not a function")
}
_, err = function.Call(otto.Value{})
return err
}