41 lines
825 B
Go
41 lines
825 B
Go
// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
|
|
|
|
package at
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
func parse_scroll_amount(amt string) ([2]interface{}, error) {
|
|
var ans [2]interface{}
|
|
if amt == "start" || amt == "end" {
|
|
ans[0] = amt
|
|
ans[1] = nil
|
|
} else {
|
|
pages := strings.Contains(amt, "p")
|
|
unscroll := strings.Contains(amt, "u")
|
|
var mult float64 = 1
|
|
if strings.HasSuffix(amt, "-") && !unscroll {
|
|
mult = -1
|
|
q, err := strconv.ParseFloat(strings.TrimRight(amt, "+-plu"), 64)
|
|
if err != nil {
|
|
return ans, err
|
|
}
|
|
if !pages && q != float64(int(q)) {
|
|
return ans, fmt.Errorf("The number must be an integer")
|
|
}
|
|
ans[0] = q * mult
|
|
if pages {
|
|
ans[1] = "p"
|
|
} else if unscroll {
|
|
ans[1] = "u"
|
|
} else {
|
|
ans[1] = "l"
|
|
}
|
|
}
|
|
}
|
|
return ans, nil
|
|
}
|