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rot13.hs

 1 {- The authors of this work have released all rights to it and placed it
 2 in the public domain under the Creative Commons CC0 1.0 waiver
 3 (http://creativecommons.org/publicdomain/zero/1.0/).
 4 
 5 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 6 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 7 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 8 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 9 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
10 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
11 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12 
13 Retrieved from: http://en.literateprograms.org/Rot13_(Haskell)?oldid=19203
14 -}
15 
16 module Rot13 where
17 
18 import Char
19 
20 lSet = ['a'..'m'] ++ ['A'..'M'] ++ ['0'..'4']
21 rSet = ['n'..'z'] ++ ['N'..'Z'] ++ ['5'..'9']
22 
23 charMap = (zip lSet rSet) ++ (zip rSet lSet)
24 
25 findInList myList myChar = if myList == [] then myChar else
26   (if (fst (head myList)) == myChar then (snd (head myList)) else (findInList (tail myList) myChar))
27 
28 rot13 string = map (findInList charMap) string
29 


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