func main() {
r := bufio.NewReaderSize(os.Stdin, 4096)
for {
fmt.Print("> ")
line, _, err := r.ReadLine()
if err == io.EOF {
return
} else if err != nil {
log.Fatal(err)
}
expr, err := eval.Parse(string(line))
if err != nil {
fmt.Printf("Invalid expression: %s\n", line)
continue
}
vars := map[eval.Var]bool{}
err = expr.Check(vars)
if err != nil {
fmt.Printf("Invalid expression: %s\n", err)
continue
}
env := eval.Env{}
for v := range vars {
for {
fmt.Printf("%s = ", v)
line, _, err := r.ReadLine()
if err == io.EOF {
return
} else if err != nil {
log.Fatal(err)
}
f, err := strconv.ParseFloat(string(line), 64)
if err != nil {
fmt.Printf("Invalid value: %s\n", err)
continue
}
env[v] = f
break
}
}
fmt.Printf("%f\n", expr.Eval(env))
}
}
func main() {
handler := func(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
d := &data{"", 0.0}
if len(q["expr"]) > 0 {
d.Expr = q["expr"][0]
expr, err := eval.Parse(q["expr"][0])
if err == nil {
d.Result = expr.Eval(eval.Env{})
}
}
calc.Execute(w, d)
}
http.HandleFunc("/", handler)
log.Println("Running server in localhost:8000 ...")
log.Fatal(http.ListenAndServe("localhost:8000", nil))
}
