Text.key_plain: def of bend-toon-codec@0.1.0.0
Import: import bend-toon-codec@0.1.0.0/src/text.bend as Text
Lines 144-150 of bend-toon-codec@0.1.0.0/src/text.bend: https://jend.leeeet.dev/read.txt?path=bend-toon-codec@0.1.0.0/src/text.bend&start_line=144&end_line=150

import Base

# `^[A-Za-z_][A-Za-z0-9_.]*$`.
def key_plain(+s: String) -> Bool:
  match s:
    case SNil{}:
      False{}
    case SCon{c, t}:
      key_start(c) && key_tail(t)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/text.bend&name=key_start
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/text.bend&name=key_tail