mirror of https://github.com/status-im/op-geth.git
116 lines
2.2 KiB
Go
116 lines
2.2 KiB
Go
package jsre
|
|
|
|
import (
|
|
"fmt"
|
|
"github.com/robertkrimen/otto"
|
|
"io/ioutil"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
)
|
|
|
|
/*
|
|
JSRE is a generic JS runtime environment embedding the otto JS interpreter.
|
|
It provides some helper functions to
|
|
- load code from files
|
|
- run code snippets
|
|
- require libraries
|
|
- bind native go objects
|
|
*/
|
|
type JSRE struct {
|
|
assetPath string
|
|
vm *otto.Otto
|
|
}
|
|
|
|
func New(assetPath string) *JSRE {
|
|
re := &JSRE{
|
|
assetPath,
|
|
otto.New(),
|
|
}
|
|
|
|
// load prettyprint func definition
|
|
re.vm.Run(pp_js)
|
|
re.vm.Set("loadScript", re.loadScript)
|
|
|
|
return re
|
|
}
|
|
|
|
// Exec(file) loads and runs the contents of a file
|
|
// if a relative path is given, the jsre's assetPath is used
|
|
func (self *JSRE) Exec(file string) error {
|
|
return self.exec(common.AbsolutePath(self.assetPath, file))
|
|
}
|
|
|
|
func (self *JSRE) exec(path string) error {
|
|
code, err := ioutil.ReadFile(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = self.vm.Run(code)
|
|
return err
|
|
}
|
|
|
|
func (self *JSRE) Bind(name string, v interface{}) (err error) {
|
|
self.vm.Set(name, v)
|
|
return
|
|
}
|
|
|
|
func (self *JSRE) Run(code string) (otto.Value, error) {
|
|
return self.vm.Run(code)
|
|
}
|
|
|
|
func (self *JSRE) Get(ns string) (otto.Value, error) {
|
|
return self.vm.Get(ns)
|
|
}
|
|
|
|
func (self *JSRE) Set(ns string, v interface{}) error {
|
|
return self.vm.Set(ns, v)
|
|
}
|
|
|
|
func (self *JSRE) loadScript(call otto.FunctionCall) otto.Value {
|
|
file, err := call.Argument(0).ToString()
|
|
if err != nil {
|
|
return otto.FalseValue()
|
|
}
|
|
if err := self.Exec(file); err != nil {
|
|
fmt.Println("err:", err)
|
|
return otto.FalseValue()
|
|
}
|
|
|
|
return otto.TrueValue()
|
|
}
|
|
|
|
func (self *JSRE) PrettyPrint(v interface{}) (val otto.Value, err error) {
|
|
var method otto.Value
|
|
v, err = self.vm.ToValue(v)
|
|
if err != nil {
|
|
return
|
|
}
|
|
method, err = self.vm.Get("prettyPrint")
|
|
if err != nil {
|
|
return
|
|
}
|
|
return method.Call(method, v)
|
|
}
|
|
|
|
func (self *JSRE) ToVal(v interface{}) otto.Value {
|
|
result, err := self.vm.ToValue(v)
|
|
if err != nil {
|
|
fmt.Println("Value unknown:", err)
|
|
return otto.UndefinedValue()
|
|
}
|
|
return result
|
|
}
|
|
|
|
func (self *JSRE) Eval(code string) (s string, err error) {
|
|
var val otto.Value
|
|
val, err = self.Run(code)
|
|
if err != nil {
|
|
return
|
|
}
|
|
val, err = self.PrettyPrint(val)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return fmt.Sprintf("%v", val), nil
|
|
}
|