ci: compile the manual

[nit.git] / lib / crypto / basic_ciphers.nit

diff --git a/lib/crypto/basic_ciphers.nit b/lib/crypto/basic_ciphers.nit
index e4a133c..7181928 100644 (file)
--- a/lib/crypto/basic_ciphers.nit
+++ b/lib/crypto/basic_ciphers.nit
@@ -154,6 +154,56 @@ redef class Text
                end
                return arr.to_s
        end
+
+       # Vigenere encoder on ASCII letters.
+       #
+       # Only the letters in '[A-Za-z]' are encoded while keeping the case.
+       #
+       #     assert "Hello, World!".vigenere("abc") == "Hfnlp, Yosnd!"
+       #
+       # REQUIRE `key` contains only lowercases '[a-z]'
+       fun vigenere(key: String): String
+       do
+               var res = new Buffer
+               res.enlarge(length)
+               var i = 0
+               for c in self do
+                       var k = key[i%key.length]
+                       assert k >= 'a' and k <= 'z'
+                       if c.is_letter then
+                               var d = k.code_point - 'a'.code_point
+                               c = c.rot(d)
+                               i += 1
+                       end
+                       res.add c
+               end
+               return res.to_s
+       end
+
+       # Vigenere decoder on ASCII letters.
+       #
+       # Only the letters in '[A-Za-z]' are decoded while keeping the case.
+       #
+       #     assert "Hfnlp, Yosnd!".uvigenere("abc") == "Hello, World!"
+       #
+       # REQUIRE `key` contains only lowercases '[a-z]'
+       fun uvigenere(key: String): String
+       do
+               var res = new Buffer
+               res.enlarge(length)
+               var i = 0
+               for c in self do
+                       var k = key[i%key.length]
+                       assert k >= 'a' and k <= 'z'
+                       if c.is_letter then
+                               var d = k.code_point - 'a'.code_point
+                               c = c.rot(-d)
+                               i += 1
+                       end
+                       res.add c
+               end
+               return res.to_s
+       end
 end
 
 redef class Bytes
@@ -162,12 +212,12 @@ redef class Bytes
        #     assert "this is a test".to_bytes.hamming_distance("wokka wokka!!!".bytes) == 37
        #     assert "this is a test".to_bytes.hamming_distance("this is a test".bytes) == 0
        #
-       fun hamming_distance(other: SequenceRead[Byte]): Int do
+       fun hamming_distance(other: SequenceRead[Int]): Int do
                var diff = 0
                for idx in self.length.times do
                        var res_byte = self[idx] ^ other[idx]
                        for bit in [0..8[ do
-                               if res_byte & 1u8 == 1u8 then diff += 1
+                               if res_byte & 1 == 1 then diff += 1
                                res_byte = res_byte >> 1
                        end
                end