Pdb.parse_atom_z: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/pdb.bend as Pdb
Lines 246-253 of bend-prot@0.1.0.0/pdb.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/pdb.bend&start_line=246&end_line=253

import Base
import bend-prot@0.1.0.0/geom.bend as G
import bend-prot@0.1.0.0/protein.bend as P

# One ATOM line -> (chain, seq, atom). None{} when any field fails.
# Threaded bottom-up: each helper matches one Maybe and passes the rest on.
def parse_atom_z(serial: U32, ch: U32, seq: Nat, x: F32, y: F32, mz: Maybe<&2, F32>, elem_s: String, name_s: String) -> Maybe<&1, U32 & Nat & P.Atom>:
  match mz:
    case None{}:
      None{}
    case Some{z}:
      Some{(ch, seq, P.Atom{serial, elem_of(elem_s, name_s), G.V3{x, y, z}})}

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/pdb.bend&name=elem_of
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=Atom