Merge pull request JuliaLang#40 from andrej-makarov-skrt/ex-atbash-ci…

…pher

Add exercise: atbash-cipher

config.json

@@ -99,15 +99,24 @@
         "arithmetics",
         "control-flow (conditionals)"
       ]
+    },
+	{
+      "slug": "atbash-cipher",
+      "difficulty": 1,
+      "topics": [
+        "strings",
+        "control-flow (conditionals)",
+        "control-flow (loops)"
+      ]
     },
     {
-        "slug": "roman-numerals",
-        "difficulty": 1,
-        "topics": [
-          "control-flow (loops)",
-          "strings",
-          "mathematics"
-        ]
+      "slug": "roman-numerals",
+      "difficulty": 1,
+      "topics": [
+        "control-flow (loops)",
+        "strings",
+        "mathematics"
+      ]
     },
     {
       "slug": "isogram",

exercises/atbash-cipher/atbash-cipher.jl

@@ -0,0 +1,8 @@
+function encode(input::AbstractString)
+
+end
+
+function decode(input::AbstractString)
+
+end
+

exercises/atbash-cipher/example.jl

@@ -0,0 +1,4 @@
+cipher(input::AbstractString) = map(x->isalpha(x)?Char(219-Int(x)):x, lowercase(filter(isalnum, input)))
+encode(input::AbstractString) = join(matchall(r"(.{1,5})", cipher(input)), ' ')
+decode(input::AbstractString) = cipher(input)
+

exercises/atbash-cipher/runtests.jl

@@ -0,0 +1,56 @@
+using Base.Test
+
+include("atbash-cipher.jl")
+
+@testset "encoding from English to atbash" begin
+	@testset "encode yes" begin
+		@test encode("yes") == "bvh"
+	end
+
+	@testset "encode no" begin
+		@test encode("no") == "ml"
+	end
+
+	@testset "encode OMG" begin
+		@test encode("OMG") == "lnt"
+	end
+
+	@testset "encode spaces" begin
+		@test encode("O M G") == "lnt"
+	end
+
+	@testset "encode mindblowingly" begin
+		@test encode("mindblowingly") == "nrmwy oldrm tob"
+	end
+
+	@testset "encode numbers" begin
+		@test encode("Testing,1 2 3, testing.") == "gvhgr mt123 gvhgr mt"
+	end
+
+	@testset "encode deep thought" begin
+		@test encode("Truth is fiction.") == "gifgs rhurx grlm"
+	end
+
+	@testset "encode all the letters" begin
+		@test encode("The quick brown fox jumps over the lazy dog.") == "gsvjf rxpyi ldmul cqfnk hlevi gsvoz abwlt"
+	end
+end
+
+@testset "decoding from atbash to English" begin
+	@testset "decode exercism" begin
+		@test decode("vcvix rhn") == "exercism"
+	end
+
+	@testset "decode a sentence" begin
+		@test decode("zmlyh gzxov rhlug vmzhg vkkrm thglm v") == "anobstacleisoftenasteppingstone"
+	end
+
+	@testset "decode numbers" begin
+		@test decode("gvhgr mt123 gvhgr mt") == "testing123testing"
+	end
+
+	@testset "decode all the letters" begin
+		@test decode("gsvjf rxpyi ldmul cqfnk hlevi gsvoz abwlt") == "thequickbrownfoxjumpsoverthelazydog"
+	end
+end
+