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#
#
# Nim's Runtime Library
# (c) Copyright 2016 Joey Payne
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module contains various string utility routines that are uncommonly
## used in comparison to `strutils <strutils.html>`_.
import strutils
{.deadCodeElim: on.}
proc partition*(s: string, sep: string,
right: bool = false): (string, string, string)
{.noSideEffect, procvar.} =
## Split the string at the first or last occurrence of `sep` into a 3-tuple
##
## Returns a 3 string tuple of (beforeSep, `sep`, afterSep) or
## (`s`, "", "") if `sep` is not found and `right` is false or
## ("", "", `s`) if `sep` is not found and `right` is true
let position = if right: s.rfind(sep) else: s.find(sep)
if position != -1:
let
beforeSep = s[0 ..< position]
afterSep = s[position + sep.len ..< s.len]
return (beforeSep, sep, afterSep)
return if right: ("", "", s) else: (s, "", "")
proc rpartition*(s: string, sep: string): (string, string, string)
{.noSideEffect, procvar.} =
## Split the string at the last occurrence of `sep` into a 3-tuple
##
## Returns a 3 string tuple of (beforeSep, `sep`, afterSep) or
## ("", "", `s`) if `sep` is not found
return partition(s, sep, right = true)
when isMainModule:
doAssert partition("foo:bar", ":") == ("foo", ":", "bar")
doAssert partition("foobarbar", "bar") == ("foo", "bar", "bar")
doAssert partition("foobarbar", "bank") == ("foobarbar", "", "")
doAssert partition("foobarbar", "foo") == ("", "foo", "barbar")
doAssert partition("foofoobar", "bar") == ("foofoo", "bar", "")
doAssert rpartition("foo:bar", ":") == ("foo", ":", "bar")
doAssert rpartition("foobarbar", "bar") == ("foobar", "bar", "")
doAssert rpartition("foobarbar", "bank") == ("", "", "foobarbar")
doAssert rpartition("foobarbar", "foo") == ("", "foo", "barbar")
doAssert rpartition("foofoobar", "bar") == ("foofoo", "bar", "")
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