func doReadEval(str string) error {
//R
val, lerr := ds.ReadString(str)
if lerr != nil {
fmt.Println("ReadError: " + lerr.Error())
return lerr
}
if val == nil {
return nil
}
//E
_, verr := ds.Eval(val, gEnv)
if verr != nil {
fmt.Println("EvalError: " + verr.Error())
return verr
}
return nil
}
func shell() {
defer func() {
if x := recover(); x != nil {
fmt.Println("droscheme: caught exception:")
fmt.Println(x)
}
}()
defaultPrompt := "ds"
prompt := defaultPrompt
lines := ""
in := bufio.NewReader(os.Stdin)
//L
for line, rerr := getLine(in, prompt); rerr == nil; line, rerr = getLine(in, prompt) {
if line == "\n" {
lines = ""
prompt = defaultPrompt
continue
} else {
lines += line
}
if ds.CountParens(lines) != 0 {
prompt = " -"
continue
}
//R
val, lerr := ds.ReadString(lines)
if lerr != nil {
fmt.Println("ReadError: " + lerr.Error())
continue
}
if val == nil {
continue
}
lines = ""
prompt = defaultPrompt
if gDontEval {
outs, ok := val.(fmt.Stringer)
if ok && outs.String() != "" {
fmt.Println(outs)
}
continue
}
//E
out, verr := ds.Eval(val, gEnv)
if verr != nil {
fmt.Println("EvalError: " + verr.Error())
continue
}
//P
outs, ok := out.(fmt.Stringer)
if ok && outs.String() != "" {
fmt.Println(out)
}
}
fmt.Println()
}
