Pbjson.read.opt: def of bendonnect-rpc@0.1.0.0
Import: import bendonnect-rpc@0.1.0.0/src/pbjson.bend as Pbjson
Lines 603-618 of bendonnect-rpc@0.1.0.0/src/pbjson.bend: https://jend.leeeet.dev/read.txt?path=bendonnect-rpc@0.1.0.0/src/pbjson.bend&start_line=603&end_line=618

import Base
import bend-kit-json@0.6.1.1/json.bend as Json

# Presence-aware read for optional scalars, oneof members and singular messages:
# null/absent -> None, otherwise Some(read(v)).
def read.opt(~T: Data, ~read: Json.Val -> Result<&2, &1, String, T>, v: Json.Val) -> Result<&2, &1, String, Maybe<&2, T>>:
  match v:
    case Json.Null{}:
      Done{None{}}
    case Json.Flag{on}:
      opt.some(~T, ~read, Json.Flag{on})
    case Json.Num{s}:
      opt.some(~T, ~read, Json.Num{s})
    case Json.Str{s}:
      opt.some(~T, ~read, Json.Str{s})
    case Json.Arr{xs}:
      opt.some(~T, ~read, Json.Arr{xs})
    case Json.Obj{kvs}:
      opt.some(~T, ~read, Json.Obj{kvs})

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=bend-kit-json@0.7.0.0/json.bend&name=Val
  https://jend.leeeet.dev/definition.txt?path=bendonnect-rpc@0.1.0.0/src/pbjson.bend&name=opt.some