Emit.is_safe.plain: def of yaml-for-bend@0.1.1.0
Import: import yaml-for-bend@0.1.1.0/emit.bend as Emit
Lines 115-122 of yaml-for-bend@0.1.1.0/emit.bend: https://jend.leeeet.dev/read.txt?path=yaml-for-bend@0.1.1.0/emit.bend&start_line=115&end_line=122

import Base
import yaml-for-bend@0.1.1.0/core.bend as C

# Whether +s+ reads back as itself when written plain: it isn't empty, has
# no blank at either end, starts with no indicator, holds no ": ", " #" or
# character that needs escaping, and the Core schema reads it as a string.
def is_safe.plain(+s: String) -> Bool:
  Bool.and(Bool.and(Bool.not(String.is_empty(s)), all.plain(s)),
    Bool.and(Bool.and(Bool.not(is_in(first.char(s), " -?:,[]{}#&*!|>'\"%@`")), Bool.not(Char.is_eq(last.char(s), ' '))),
      Bool.and(Bool.and(Bool.not(String.contains(s, ": ")), Bool.not(String.contains(s, " #"))),
        Bool.and(Bool.not(String.ends_with(s, ":")), is_str(C.plain(s))))))

Uses (15):
  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=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.contains
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.ends_with
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.is_empty
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/core.bend&name=plain
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/emit.bend&name=all.plain
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/emit.bend&name=first.char
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/emit.bend&name=is_in
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/emit.bend&name=is_str
  https://jend.leeeet.dev/definition.txt?path=yaml-for-bend@0.1.1.0/emit.bend&name=last.char