ifrange.nim

import strutils

proc mangle*(name: string): string =
  result = ""
  case name[0]
  of Letters:
    result.add(name[0].toLower)
  of Digits:
    result.add("N" & name[0])
  else:
    result = "HEX" & toHex(ord(name[0]), 2)
  for i in 1..(name.len-1):
    let c = name[i]
    case c
    of 'A'..'Z':
      add(result, c.toLower)
    of '_':
      discard
    of 'a'..'z', '0'..'9':
      add(result, c)
    else:
      add(result, "HEX" & toHex(ord(c), 2))

proc mangleField(name: string): string =
  result = mangle(name)
  if name[0] in 'a'..'z':
    result[0] = name[0].toUpper

echo mangleField("Union")
echo mangleField("auto")