/
interpreter.go
43 lines (37 loc) · 1.13 KB
/
interpreter.go
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package interpreter
import (
"go/token"
"log"
"os"
"github.com/goruby/goruby/evaluator"
"github.com/goruby/goruby/object"
"github.com/goruby/goruby/parser"
)
// Interpreter defines the methods of an interpreter
type Interpreter interface {
Interpret(filename string, input interface{}) (object.RubyObject, error)
}
// New returns an Interpreter ready to use and with the environment set to
// object.NewMainEnvironment()
func New() Interpreter {
cwd, err := os.Getwd()
if err != nil {
log.Printf("Cannot get working directory: %s\n", err)
}
env := object.NewMainEnvironment()
loadPath, _ := env.Get("$:")
loadPathArr := loadPath.(*object.Array)
loadPathArr.Elements = append(loadPathArr.Elements, &object.String{Value: cwd})
env.SetGlobal("$:", loadPathArr)
return &interpreter{environment: env}
}
type interpreter struct {
environment object.Environment
}
func (i *interpreter) Interpret(filename string, input interface{}) (object.RubyObject, error) {
node, err := parser.ParseFile(token.NewFileSet(), filename, input, 0)
if err != nil {
return nil, object.NewSyntaxError(err)
}
return evaluator.Eval(node, i.environment)
}