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|
use "chartype"
use "die"
use "hasprefix"
use "option"
use "striter"
use "types"
use "utf"
pkg std =
generic intparsebase : (s : byte[:], base : int -> option(@a::(integral,numeric)))
generic intparse : (s : byte[:] -> option(@a::(integral,numeric)))
;;
generic intparse = {s
var isneg
isneg = false
if hasprefix(s, "-")
s = s[1:]
isneg = true
;;
if s.len == 0
-> `None
;;
if hasprefix(s, "0x")
-> doparse(s[2:], isneg, 16)
elif hasprefix(s, "0o")
-> doparse(s[2:], isneg, 8)
elif hasprefix(s, "0b")
-> doparse(s[2:], isneg, 2)
else
-> doparse(s, isneg, 10)
;;
}
generic intparsebase = {s, base
var isneg
isneg = false
if hasprefix(s, "-")
s = s[1:]
isneg = true
;;
-> doparse(s, isneg, base)
}
generic doparse = {s, isneg, base -> option(@a::(integral,numeric))
var v
var cv : int32
v = 0
for c : std.bychar(s)
if c == '_'
continue
;;
cv = charval(c, base)
if cv >= 0
v *= (base : @a::(integral,numeric))
v += (cv : @a::(integral,numeric))
else
-> `None
;;
;;
if isneg
-> `Some -v
else
-> `Some v
;;
}
|
