gistfile1.txt

import strutils

type charContainer = generic c
  c.contains(char) is bool

iterator split*(s: string, seps: charContainer = Whitespace): string =
  ## Splits the string `s` into substrings using a group of separators.
  ##
  ## Substrings are separated by a substring containing only `seps`. Note
  ## that whole sequences of characters found in ``seps`` will be counted as
  ## a single split point and leading/trailing separators will be ignored.
  var last = 0
  assert(not ('\0' in seps))
  while last < len(s):
    while s[last] in seps: inc(last)
    var first = last
    while last < len(s) and s[last] notin seps: inc(last) # BUGFIX!
    if first <= last-1:
      yield substr(s, first, last-1)