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package javascript
import (
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/xeth"
"github.com/obscuren/otto"
)
var jsrelogger = logger.NewLogger("JSRE")
type JSRE struct {
Vm *otto.Otto
xeth *xeth.XEth
objectCb map[string][]otto.Value
}
func (jsre *JSRE) LoadExtFile(path string) {
result, err := ioutil.ReadFile(path)
if err == nil {
jsre.Vm.Run(result)
} else {
jsrelogger.Infoln("Could not load file:", path)
}
}
func (jsre *JSRE) LoadIntFile(file string) {
assetPath := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist", "assets", "ext")
jsre.LoadExtFile(path.Join(assetPath, file))
}
func NewJSRE(xeth *xeth.XEth) *JSRE {
re := &JSRE{
otto.New(),
xeth,
make(map[string][]otto.Value),
}
// Init the JS lib
re.Vm.Run(jsLib)
// Load extra javascript files
re.LoadIntFile("bignumber.min.js")
re.Bind("eth", &JSEthereum{re.xeth, re.Vm})
re.initStdFuncs()
jsrelogger.Infoln("started")
return re
}
func (self *JSRE) Bind(name string, v interface{}) {
self.Vm.Set(name, v)
}
func (self *JSRE) Run(code string) (otto.Value, error) {
return self.Vm.Run(code)
}
func (self *JSRE) initStdFuncs() {
t, _ := self.Vm.Get("eth")
eth := t.Object()
eth.Set("require", self.require)
}
func (self *JSRE) Require(file string) error {
if len(filepath.Ext(file)) == 0 {
file += ".js"
}
fh, err := os.Open(file)
if err != nil {
return err
}
content, _ := ioutil.ReadAll(fh)
self.Run("exports = {};(function() {" + string(content) + "})();")
return nil
}
func (self *JSRE) require(call otto.FunctionCall) otto.Value {
file, err := call.Argument(0).ToString()
if err != nil {
return otto.UndefinedValue()
}
if err := self.Require(file); err != nil {
fmt.Println("err:", err)
return otto.UndefinedValue()
}
t, _ := self.Vm.Get("exports")
return t
}
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