func evalCmd(line string) {
ctx := &eval.Ctx{line}
if expr, err := parser.ParseExpr(line); err != nil {
if pair := eval.FormatErrorPos(line, err.Error()); len(pair) == 2 {
fmt.Println(pair[0])
fmt.Println(pair[1])
}
fmt.Printf("parse error: %s\n", err)
} else if cexpr, errs := eval.CheckExpr(ctx, expr, env); len(errs) != 0 {
for _, cerr := range errs {
fmt.Printf("%v\n", cerr)
}
} else if vals, _, err := eval.EvalExpr(ctx, cexpr, env); err != nil {
fmt.Printf("eval error: %s\n", err)
} else if vals == nil {
fmt.Printf("Kind=nil\nnil\n")
} else if len(*vals) == 0 {
fmt.Printf("Kind=Slice\nvoid\n")
} else if len(*vals) == 1 {
value := (*vals)[0]
if value.IsValid() {
kind := value.Kind().String()
typ := value.Type().String()
if typ != kind {
fmt.Printf("Kind = %v\n", kind)
fmt.Printf("Type = %v\n", typ)
} else {
fmt.Printf("Kind = Type = %v\n", kind)
}
n := len(results)
results = append(results, (*vals)[0].Interface())
fmt.Printf("results[%d] = %s\n", n, eval.Inspect(value))
} else {
fmt.Printf("%s\n", value)
}
} else {
fmt.Printf("Kind = Multi-Value\n")
size := len(*vals)
for i, v := range *vals {
fmt.Printf("%s", eval.Inspect(v))
if i < size-1 {
fmt.Printf(", ")
}
}
fmt.Printf("\n")
results = append(results, (*vals))
}
}
func evalCmd(line string) {
ctx := &eval.Ctx{line}
if expr, err := parser.ParseExpr(line); err != nil {
//
// error parsing
//
if pair := eval.FormatErrorPos(line, err.Error()); len(pair) == 2 {
fmt.Println(pair[0])
fmt.Println(pair[1])
}
fmt.Printf("parse error: %s\n", err)
} else if cexpr, errs := eval.CheckExpr(ctx, expr, env); len(errs) != 0 {
//
// error ...
//
for _, cerr := range errs {
fmt.Printf("%v\n", cerr)
}
} else if vals, _, err := eval.EvalExpr(ctx, cexpr, env); err != nil {
//
// error evaluating expression
//
fmt.Printf("eval error: %s\n", err)
} else if vals == nil {
fmt.Println(vals)
} else {
for i, v := range *vals {
if i > 0 {
fmt.Printf(", ")
}
fmt.Printf("%s", eval.Inspect(v))
}
fmt.Printf("\n")
if len(*vals) == 1 {
env.Vars["_"] = (*vals)[0]
} else {
env.Vars["_"] = reflect.ValueOf(*vals)
}
}
}
