Add say exercise

bin/generate

@@ -355,7 +355,7 @@ def generate(exercise, flags, problem_specs_source, force=False):
         write(path / ('%s.sml' % exercise), content)
 
     if flags & EXAMPLE:
-        write(path / 'example.sml', content)
+        write(path / '.meta/example.sml', content)
 
     shutil.copyfile(
         (root / 'lib/testlib.sml').as_posix(),

config.json

@@ -609,6 +609,14 @@
         "prerequisites": [],
         "difficulty": 5
       },
+      {
+        "slug": "say",
+        "name": "Say",
+        "uuid": "f3bcc2f2-9752-4fb4-81f0-a790c0c2b3e6",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
+      },
       {
         "slug": "transpose",
         "name": "Transpose",

exercises/practice/say/.docs/instructions.md

@@ -0,0 +1,48 @@
+# Instructions
+
+Given a number from 0 to 999,999,999,999, spell out that number in English.
+
+## Step 1
+
+Handle the basic case of 0 through 99.
+
+If the input to the program is `22`, then the output should be `'twenty-two'`.
+
+Your program should complain loudly if given a number outside the blessed range.
+
+Some good test cases for this program are:
+
+- 0
+- 14
+- 50
+- 98
+- -1
+- 100
+
+### Extension
+
+If you're on a Mac, shell out to Mac OS X's `say` program to talk out loud.
+If you're on Linux or Windows, eSpeakNG may be available with the command `espeak`.
+
+## Step 2
+
+Implement breaking a number up into chunks of thousands.
+
+So `1234567890` should yield a list like 1, 234, 567, and 890, while the far simpler `1000` should yield just 1 and 0.
+
+## Step 3
+
+Now handle inserting the appropriate scale word between those chunks.
+
+So `1234567890` should yield `'1 billion 234 million 567 thousand 890'`
+
+The program must also report any values that are out of range.
+It's fine to stop at "trillion".
+
+## Step 4
+
+Put it all together to get nothing but plain English.
+
+`12345` should give `twelve thousand three hundred forty-five`.
+
+The program must also report any values that are out of range.

exercises/practice/say/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "keiravillekode"
+  ],
+  "files": {
+    "solution": [
+      "say.sml"
+    ],
+    "test": [
+      "test.sml"
+    ],
+    "example": [
+      ".meta/example.sml"
+    ]
+  },
+  "blurb": "Given a number from 0 to 999,999,999,999, spell out that number in English.",
+  "source": "A variation on the JavaRanch CattleDrive, Assignment 4",
+  "source_url": "https://coderanch.com/wiki/718804"
+}

exercises/practice/say/.meta/example.sml

@@ -0,0 +1,59 @@
+val unitNames = Array.fromList [
+  "zero",
+  "one",
+  "two",
+  "three",
+  "four",
+  "five",
+  "six",
+  "seven",
+  "eight",
+  "nine",
+  "ten",
+  "eleven",
+  "twelve",
+  "thirteen",
+  "fourteen",
+  "fifteen",
+  "sixteen",
+  "seventeen",
+  "eighteen",
+  "nineteen"
+]
+
+val decadeNames = Array.fromList [
+  "zero",
+  "ten",
+  "twenty",
+  "thirty",
+  "forty",
+  "fifty",
+  "sixty",
+  "seventy",
+  "eighty",
+  "ninety"
+]
+
+fun words (number: int): string list =
+  if number >= 1000000000
+  then (words (number div 1000000000)) @ ("billion" :: (words (number mod 1000000000)))
+  else if number >= 1000000
+  then (words (number div 1000000)) @ ("million" :: (words (number mod 1000000)))
+  else if number >= 1000
+  then (words (number div 1000)) @ ("thousand" :: (words (number mod 1000)))
+  else if number >= 100
+  then (words (number div 100)) @ ("hundred" :: (words (number mod 100)))
+  else if number = 0
+  then []
+  else if number < 20
+  then [Array.sub (unitNames, number)]
+  else if (number mod 10) = 0
+  then [Array.sub (decadeNames, number div 10)]
+  else [Array.sub (decadeNames, number div 10) ^ "-" ^ Array.sub (unitNames, number mod 10)]
+
+fun say (number: int): string =
+  if (number < 0) orelse (number > 999999999999)
+  then raise Fail "input out of range"
+  else if number = 0
+  then "zero"
+  else String.concatWith " " (words number)

exercises/practice/say/.meta/tests.toml

@@ -0,0 +1,67 @@
+# 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.
+
+[5d22a120-ba0c-428c-bd25-8682235d83e8]
+description = "zero"
+
+[9b5eed77-dbf6-439d-b920-3f7eb58928f6]
+description = "one"
+
+[7c499be1-612e-4096-a5e1-43b2f719406d]
+description = "fourteen"
+
+[f541dd8e-f070-4329-92b4-b7ce2fcf06b4]
+description = "twenty"
+
+[d78601eb-4a84-4bfa-bf0e-665aeb8abe94]
+description = "twenty-two"
+
+[f010d4ca-12c9-44e9-803a-27789841adb1]
+description = "thirty"
+
+[738ce12d-ee5c-4dfb-ad26-534753a98327]
+description = "ninety-nine"
+
+[e417d452-129e-4056-bd5b-6eb1df334dce]
+description = "one hundred"
+
+[d6924f30-80ba-4597-acf6-ea3f16269da8]
+description = "one hundred twenty-three"
+
+[2f061132-54bc-4fd4-b5df-0a3b778959b9]
+description = "two hundred"
+
+[feed6627-5387-4d38-9692-87c0dbc55c33]
+description = "nine hundred ninety-nine"
+
+[3d83da89-a372-46d3-b10d-de0c792432b3]
+description = "one thousand"
+
+[865af898-1d5b-495f-8ff0-2f06d3c73709]
+description = "one thousand two hundred thirty-four"
+
+[b6a3f442-266e-47a3-835d-7f8a35f6cf7f]
+description = "one million"
+
+[2cea9303-e77e-4212-b8ff-c39f1978fc70]
+description = "one million two thousand three hundred forty-five"
+
+[3e240eeb-f564-4b80-9421-db123f66a38f]
+description = "one billion"
+
+[9a43fed1-c875-4710-8286-5065d73b8a9e]
+description = "a big number"
+
+[49a6a17b-084e-423e-994d-a87c0ecc05ef]
+description = "numbers below zero are out of range"
+
+[4d6492eb-5853-4d16-9d34-b0f61b261fd9]
+description = "numbers above 999,999,999,999 are out of range"

exercises/practice/say/say.sml

@@ -0,0 +1,2 @@
+fun say (number: int): string =
+  raise Fail "'say' is not implemented"

exercises/practice/say/test.sml

@@ -0,0 +1,67 @@
+use "testlib.sml";
+use "say.sml";
+
+infixr |>
+fun x |> f = f x
+
+val testsuite =
+  describe "say" [
+    test "zero"
+      (fn _ => say 0 |> Expect.equalTo "zero"),
+
+    test "one"
+      (fn _ => say 1 |> Expect.equalTo "one"),
+
+    test "fourteen"
+      (fn _ => say 14 |> Expect.equalTo "fourteen"),
+
+    test "twenty"
+      (fn _ => say 20 |> Expect.equalTo "twenty"),
+
+    test "twenty-two"
+      (fn _ => say 22 |> Expect.equalTo "twenty-two"),
+
+    test "thirty"
+      (fn _ => say 30 |> Expect.equalTo "thirty"),
+
+    test "ninety-nine"
+      (fn _ => say 99 |> Expect.equalTo "ninety-nine"),
+
+    test "one hundred"
+      (fn _ => say 100 |> Expect.equalTo "one hundred"),
+
+    test "one hundred twenty-three"
+      (fn _ => say 123 |> Expect.equalTo "one hundred twenty-three"),
+
+    test "two hundred"
+      (fn _ => say 200 |> Expect.equalTo "two hundred"),
+
+    test "nine hundred ninety-nine"
+      (fn _ => say 999 |> Expect.equalTo "nine hundred ninety-nine"),
+
+    test "one thousand"
+      (fn _ => say 1000 |> Expect.equalTo "one thousand"),
+
+    test "one thousand two hundred thirty-four"
+      (fn _ => say 1234 |> Expect.equalTo "one thousand two hundred thirty-four"),
+
+    test "one million"
+      (fn _ => say 1000000 |> Expect.equalTo "one million"),
+
+    test "one million two thousand three hundred forty-five"
+      (fn _ => say 1002345 |> Expect.equalTo "one million two thousand three hundred forty-five"),
+
+    test "one billion"
+      (fn _ => say 1000000000 |> Expect.equalTo "one billion"),
+
+    test "a big number"
+      (fn _ => say 987654321123 |> Expect.equalTo "nine hundred eighty-seven billion six hundred fifty-four million three hundred twenty-one thousand one hundred twenty-three"),
+
+    test "numbers below zero are out of range"
+      (fn _ => (fn _ => say ~1) |> Expect.error (Fail "input out of range")),
+
+    test "numbers above 999,999,999,999 are out of range"
+      (fn _ => (fn _ => say 1000000000000) |> Expect.error (Fail "input out of range"))
+  ]
+
+val _ = Test.run testsuite