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rationalize parser

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This commit is contained in:
NunoSempere 2024-05-11 11:08:03 +01:00
parent 8142a19c4b
commit 073728e750
1 changed files with 85 additions and 53 deletions
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138
f.go
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@ -41,8 +41,6 @@ func combineBounds(old_low, old_high, new_low, new_high float64) (float64, float
}
func main() {
var old_low, old_high float64
reader := bufio.NewReader(os.Stdin)
input, _ := reader.ReadString('\n')
input = strings.TrimSpace(input)
@ -58,80 +56,114 @@ func main() {
fmt.Println(error_msg_start)
return
}
fmt.Printf("=> %.1f %.1f\n", old_low, old_high)
error_msg_cont := "Please enter two floats separated by a space, like: 1 10, or two floats preceded by a division, like: / 2 20. Or enter i to get the logmean and logstd"
error_msg_cont := "Valid inputs: 2 || * 2 || / 2 || 2 20 || * 2 20 || / 2 20 || i || e"
EventForLoop:
for {
var new_low, new_high float64
var err1, err2 error
input, _ = reader.ReadString('\n')
if strings.TrimSpace(input) == "" {
continue EventForLoop
}
tokens := strings.Split(strings.TrimSpace(input), " ")
switch len(tokens) {
case 0:
continue EventForLoop
case 1:
single_float, err1 := strconv.ParseFloat(tokens[0], 64)
switch {
case tokens[0] == "i":
fmt.Printf("=> %.1f %.1f\n", old_low, old_high)
logmean_old, logstd_old := boundsToLogParams(old_low, old_high)
fmt.Printf("=> Lognormal, with logmean: %.1f, logstd: %.1f\n", logmean_old, logstd_old)
continue EventForLoop
case err1 != nil:
new_low = single_float
new_high = single_float
default:
var new_low, new_high float64
var err1, err2 error
err1, err2 = nil, nil
switch tokens[0] {
case "*":
switch len(tokens) {
case 1:
fmt.Println("Can't multiply by nothing")
fmt.Println(error_msg_cont)
continue EventForLoop
}
case 2:
new_low, err1 = strconv.ParseFloat(tokens[0], 64)
new_high, err2 = strconv.ParseFloat(tokens[1], 64)
if err2 != nil {
fmt.Println(error_msg_cont)
continue EventForLoop
}
switch tokens[0] {
case "*":
new_low = new_high
case "/":
new_low = 1.0 / new_high
new_high = new_low
default:
case 2:
single_float, err1 := strconv.ParseFloat(tokens[1], 64)
if err1 != nil {
fmt.Println("Trying to multiply by a scalar, but scalar is not a float")
fmt.Println(error_msg_cont)
continue EventForLoop
}
}
case 3:
new_low, err1 = strconv.ParseFloat(tokens[1], 64)
new_high, err2 = strconv.ParseFloat(tokens[2], 64)
if err1 != nil || err2 != nil {
fmt.Println(error_msg_cont)
continue EventForLoop
}
switch tokens[0] {
case "*":
case "/":
tmp_low := new_low
new_low = 1.0 / new_high
new_high = 1.0 / tmp_low
new_low = single_float
new_high = single_float
case 3:
new_low, err1 = strconv.ParseFloat(tokens[1], 64)
new_high, err2 = strconv.ParseFloat(tokens[2], 64)
if err1 != nil || err2 != nil {
fmt.Println(error_msg_cont)
fmt.Println("Trying to multiply by a distribution, but distribution is not specified as two floats")
continue EventForLoop
}
default:
fmt.Println("Trying to multiply by something, but this something is neither a scalar nor a distribution")
fmt.Println(error_msg_cont)
continue EventForLoop
}
case "/":
switch len(tokens) {
case 1:
fmt.Println("Can't divide by nothing")
fmt.Println(error_msg_cont)
continue EventForLoop
case 2:
single_float, err1 := strconv.ParseFloat(tokens[0], 64)
if err1 != nil {
fmt.Println("Trying to divide by a scalar, but scalar is not a float")
fmt.Println(error_msg_cont)
continue EventForLoop
}
new_low = 1.0 / single_float
new_high = 1.0 / single_float
case 3:
new_low, err1 = strconv.ParseFloat(tokens[1], 64)
new_high, err2 = strconv.ParseFloat(tokens[2], 64)
if err1 != nil || err2 != nil {
fmt.Println("Trying to divide by a distribution, but distribution is not specified as two floats")
fmt.Println(error_msg_cont)
continue EventForLoop
}
default:
fmt.Println("Trying to divide by something, but this something is neither a scalar nor a distribution")
}
default:
fmt.Println(error_msg_cont)
continue EventForLoop
switch len(tokens) {
case 0:
continue EventForLoop
case 1:
switch tokens[0] {
case "i":
fmt.Printf("=> %.1f %.1f\n", old_low, old_high)
logmean_old, logstd_old := boundsToLogParams(old_low, old_high)
fmt.Printf("=> Lognormal, with logmean: %.1f, logstd: %.1f\n", logmean_old, logstd_old)
continue EventForLoop
case "e":
break EventForLoop
default:
single_float, err1 := strconv.ParseFloat(tokens[0], 64)
if err1 != nil {
fmt.Println("Trying to multiply by a scalar, but scalar is not a float")
fmt.Println(error_msg_cont)
continue EventForLoop
}
new_low = single_float
new_high = single_float
}
case 2:
new_low, err1 = strconv.ParseFloat(tokens[0], 64)
new_high, err2 = strconv.ParseFloat(tokens[1], 64)
if err1 != nil || err2 != nil {
fmt.Println("Trying to multiply by a distribution, but distribution is not specified as two floats")
fmt.Println(error_msg_cont)
continue EventForLoop
}
default:
fmt.Println("No operation takes more than 3 words")
fmt.Println(error_msg_cont)
continue EventForLoop
}
}
// Use the abstracted function for combining floats
old_low, old_high = combineBounds(old_low, old_high, new_low, new_high)
fmt.Printf("=> %.1f %.1f\n", old_low, old_high)
}