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cmdline.go
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cmdline.go
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package main
import "fmt"
import "os"
import "strconv"
import "strings"
func tuple_parse ( tuple string ) complex128 {
comps := strings.Split(tuple, ",")
real , err := strconv.ParseFloat(comps[0], 64)
if err != nil {
fmt.Printf("error in parsing parameter %s\n", tuple)
panic("panicing!")
}
img , err := strconv.ParseFloat(comps[1], 64)
if err != nil {
fmt.Printf("error in parsing parameter %s\n", tuple)
panic("panicing!")
}
return complex(real, img)
}
func parse_args() (complex128, complex128, int) {
var err error
res := DefaultRes
x := DefaultX
y := DefaultY
// We expect either 0 arguments (in which case the defaults hold)or 2 (x,y coords), or 3 (x,y,res)
argsWithoutProg := os.Args[1:]
switch len(argsWithoutProg) {
case 1:
if res, err = strconv.Atoi(argsWithoutProg[0]) ; err != nil {
fmt.Printf("error in parsing parameter %s\n", argsWithoutProg[2])
panic("panicing!")
}
case 2:
x = tuple_parse(argsWithoutProg[0])
y = tuple_parse(argsWithoutProg[1])
case 3:
x = tuple_parse(argsWithoutProg[1])
y = tuple_parse(argsWithoutProg[2])
if res, err = strconv.Atoi(argsWithoutProg[0]) ; err != nil {
fmt.Printf("error in parsing parameter %s\n", argsWithoutProg[2])
panic("panicing!")
}
case 0:
return x, y, res
default:
fmt.Printf("error in parsing parameter: %d parameters\nshould be 0, 2 or 3\n", len(argsWithoutProg))
panic("panicing!")
}
return x, y, res
}