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// The parscan command interprets programs.
package main
import (
"flag"
"fmt"
"log"
"os"
"github.com/mvertes/parscan/interpreter"
"github.com/mvertes/parscan/lang/golang"
)
func main() {
log.SetFlags(log.Lshortfile)
if err := run(os.Args[1:]); err != nil {
log.Fatal(err)
}
}
func run(arg []string) error {
var str string
rflag := flag.NewFlagSet("run", flag.ContinueOnError)
rflag.Usage = func() {
fmt.Println("Usage: parscan run [options] [path] [args]")
fmt.Println("Options:")
rflag.PrintDefaults()
}
rflag.StringVar(&str, "e", "", "string to eval")
if err := rflag.Parse(arg); err != nil {
return err
}
args := rflag.Args()
interp := interpreter.NewInterpreter(golang.GoSpec)
if str != "" {
return evalStr(interp, str)
}
if len(args) == 0 {
return interp.Repl(os.Stdin)
}
buf, err := os.ReadFile(arg[0])
if err != nil {
return err
}
return evalStr(interp, string(buf))
}
func evalStr(i *interpreter.Interp, s string) error {
_, err := i.Eval(s)
return err
}
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