def read_go

bend-collections@1.0.0.0 · src/crypto/argon2/phc.bend:240

import Base

240# Digits from s on top of v (d says s starts with a digit); the value and the rest.
241def read_go(s: String, +v: Nat, d: Bool) -> Got:
242  match s d:
243    case SNil{} _:
244      Got{v, SNil{}}
245    case SCon{Chr{+x}, +rest} True{}:
246      read_go(rest, Nat.add(Nat.mul(v, 10n), U32.to_nat(U32.sub(x, 48))), starts_digit(rest))
247    case SCon{c, rest} False{}:
248      Got{v, SCon{c, rest}}