add crypto-square exercise

config.json

@@ -385,6 +385,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 8
+      },
+      {
+        "slug": "crypto-square",
+        "name": "Crypto Square",
+        "uuid": "5723544b-74d3-4483-b67e-5e7b513c8867",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 4
       }
     ]
   },

exercises/practice/crypto-square/.docs/instructions.md

@@ -0,0 +1,71 @@
+# Instructions
+
+Implement the classic method for composing secret messages called a square code.
+
+Given an English text, output the encoded version of that text.
+
+First, the input is normalized: the spaces and punctuation are removed from the English text and the message is down-cased.
+
+Then, the normalized characters are broken into rows.
+These rows can be regarded as forming a rectangle when printed with intervening newlines.
+
+For example, the sentence
+
+```text
+"If man was meant to stay on the ground, god would have given us roots."
+```
+
+is normalized to:
+
+```text
+"ifmanwasmeanttostayonthegroundgodwouldhavegivenusroots"
+```
+
+The plaintext should be organized into a rectangle as square as possible.
+The size of the rectangle should be decided by the length of the message.
+
+If `c` is the number of columns and `r` is the number of rows, then for the rectangle `r` x `c` find the smallest possible integer `c` such that:
+
+- `r * c >= length of message`,
+- and `c >= r`,
+- and `c - r <= 1`.
+
+Our normalized text is 54 characters long, dictating a rectangle with `c = 8` and `r = 7`:
+
+```text
+"ifmanwas"
+"meanttos"
+"tayonthe"
+"groundgo"
+"dwouldha"
+"vegivenu"
+"sroots  "
+```
+
+The coded message is obtained by reading down the columns going left to right.
+
+The message above is coded as:
+
+```text
+"imtgdvsfearwermayoogoanouuiontnnlvtwttddesaohghnsseoau"
+```
+
+Output the encoded text in chunks that fill perfect rectangles `(r X c)`, with `c` chunks of `r` length, separated by spaces.
+For phrases that are `n` characters short of the perfect rectangle, pad each of the last `n` chunks with a single trailing space.
+
+```text
+"imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau "
+```
+
+Notice that were we to stack these, we could visually decode the ciphertext back in to the original message:
+
+```text
+"imtgdvs"
+"fearwer"
+"mayoogo"
+"anouuio"
+"ntnnlvt"
+"wttddes"
+"aohghn "
+"sseoau "
+```

exercises/practice/crypto-square/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "eNascimento178"
+  ],
+  "files": {
+    "solution": [
+      "crypto-square.ijs"
+    ],
+    "test": [
+      "test.ijs"
+    ],
+    "example": [
+      ".meta/example.ijs"
+    ]
+  },
+  "blurb": "Implement the classic method for composing secret messages called a square code.",
+  "source": "J Dalbey's Programming Practice problems",
+  "source_url": "https://users.csc.calpoly.edu/~jdalbey/103/Projects/ProgrammingPractice.html"
+}

exercises/practice/crypto-square/.meta/example.ijs

@@ -0,0 +1,6 @@
+normalize=: ('[^0-9a-zA-Z]';'')&rxrplc@tolower
+size=:{{ 
+  if. 0 = y do. 0 0 return. end.
+  /:~ (, (([: <./ ] #~ y <: *) _1 0 1&+)) >.@%: y 
+}}
+ciphertext=: ' ' joinstring (<"1)@:|:@:($!.' '~ size@#)@normalize

exercises/practice/crypto-square/.meta/tests.toml

@@ -0,0 +1,34 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[407c3837-9aa7-4111-ab63-ec54b58e8e9f]
+description = "empty plaintext results in an empty ciphertext"
+
+[aad04a25-b8bb-4304-888b-581bea8e0040]
+description = "normalization results in empty plaintext"
+
+[64131d65-6fd9-4f58-bdd8-4a2370fb481d]
+description = "Lowercase"
+
+[63a4b0ed-1e3c-41ea-a999-f6f26ba447d6]
+description = "Remove spaces"
+
+[1b5348a1-7893-44c1-8197-42d48d18756c]
+description = "Remove punctuation"
+
+[8574a1d3-4a08-4cec-a7c7-de93a164f41a]
+description = "9 character plaintext results in 3 chunks of 3 characters"
+
+[a65d3fa1-9e09-43f9-bcec-7a672aec3eae]
+description = "8 character plaintext results in 3 chunks, the last one with a trailing space"
+
+[fbcb0c6d-4c39-4a31-83f6-c473baa6af80]
+description = "54 character plaintext results in 7 chunks, the last two with trailing spaces"

exercises/practice/crypto-square/crypto-square.ijs

@@ -0,0 +1,3 @@
+require 'general/unittest'
+
+ciphertext =: 'You need to implement this verb.'13!:8 (55)

exercises/practice/crypto-square/test.ijs

@@ -0,0 +1,89 @@
+load 'crypto-square.ijs'
+
+
+before_all=: monad define
+  (]Description =: (3 : 'descriptions=: i.0')`(3 : 'descriptions=: descriptions , < y'))@.0 ''
+  (]Order       =: (3 : 'order=: i.0')`(3 : 'order=: order , < y'))@.0 ''
+  (]Task        =: (3 : 'tasks=: i.0')`(3 : 'tasks=: tasks , < y'))@.0 '' 
+)
+
+
+crypto_square_test_01_ignore=: 0
+test_crypto_square_test_01  =: monad define
+  Description@.1 ('empty plaintext results in an empty ciphertext')
+  Order@.1 (1)
+
+  NB. plaintext=. 0$0
+  NB. expected=. 0$0
+  assert (0$0) -: ciphertext 0$0
+)
+
+crypto_square_test_02_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_02  =: monad define
+  Description@.1 ('normalization results in empty plaintext')
+  Order@.1 (2)
+
+  NB. plaintext=. '... --- ...'
+  NB. expected=. 0$0
+  assert (0$0) -: ciphertext '... --- ...'
+)
+
+crypto_square_test_03_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_03  =: monad define
+  Description@.1 ('Lowercase')
+  Order@.1 (3)
+
+  NB. plaintext=. 'A'
+  NB. expected=. 'a'
+  assert (,'a') -: ciphertext 'A'
+)
+
+crypto_square_test_04_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_04  =: monad define
+  Description@.1 ('Remove spaces')
+  Order@.1 (4)
+
+  NB. plaintext=. '  b '
+  NB. expected=. 'b'
+  assert (,'b') -: ciphertext '  b '
+)
+
+crypto_square_test_05_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_05  =: monad define
+  Description@.1 ('Remove punctuation')
+  Order@.1 (5)
+
+  NB. plaintext=. '@1,%!'
+  NB. expected=. '1'
+  assert (,'1') -: ciphertext '@1,%!'
+)
+
+crypto_square_test_06_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_06  =: monad define
+  Description@.1 ('9 character plaintext results in 3 chunks of 3 characters')
+  Order@.1 (6)
+
+  NB. plaintext=. 'This is fun!'
+  NB. expected=. 'tsf hiu isn'
+  assert 'tsf hiu isn' -: ciphertext 'This is fun!'
+)
+
+crypto_square_test_07_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_07  =: monad define
+  Description@.1 ('8 character plaintext results in 3 chunks, the last one with a trailing space')
+  Order@.1 (7)
+
+  NB. plaintext=. 'Chill out.'
+  NB. expected=. 'clu hlt io '
+  assert 'clu hlt io ' -: ciphertext 'Chill out.'
+)
+
+crypto_square_test_08_ignore=: 1 NB. Change this value to 0 to run this test
+test_crypto_square_test_08  =: monad define
+  Description@.1 ('54 character plaintext results in 7 chunks, the last two with trailing spaces')
+  Order@.1 (8)
+
+  NB. plaintext=. 'If man was meant to stay on the ground, god would have given us roots.'
+  NB. expected=. 'imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau '
+  assert 'imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau ' -: ciphertext 'If man was meant to stay on the ground, god would have given us roots.'
+)