Add practice exercise: dnd-character

config.json

@@ -186,6 +186,14 @@
         "prerequisites": [],
         "difficulty": 5
       },
+      {
+        "slug": "dnd-character",
+        "name": "D&D Character",
+        "uuid": "d2da9563-a621-4e02-b2e4-f9553f3b82fc",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
+      },
       {
         "slug": "eliuds-eggs",
         "name": "Eliud's Eggs",

exercises/practice/dnd-character/.docs/instructions.md

@@ -0,0 +1,32 @@
+# Instructions
+
+For a game of [Dungeons & Dragons][dnd], each player starts by generating a character they can play with.
+This character has, among other things, six abilities; strength, dexterity, constitution, intelligence, wisdom and charisma.
+These six abilities have scores that are determined randomly.
+You do this by rolling four 6-sided dice and recording the sum of the largest three dice.
+You do this six times, once for each ability.
+
+Your character's initial hitpoints are 10 + your character's constitution modifier.
+You find your character's constitution modifier by subtracting 10 from your character's constitution, divide by 2 and round down.
+
+Write a random character generator that follows the above rules.
+
+For example, the six throws of four dice may look like:
+
+- 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
+- 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
+- 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
+- 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
+- 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
+- 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.
+
+Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.
+
+~~~~exercism/note
+Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice.
+One such language is [Troll][troll].
+
+[troll]: https://di.ku.dk/Ansatte/?pure=da%2Fpublications%2Ftroll-a-language-for-specifying-dicerolls(84a45ff0-068b-11df-825d-000ea68e967b)%2Fexport.html
+~~~~
+
+[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons

exercises/practice/dnd-character/.docs/introduction.md

@@ -0,0 +1,10 @@
+# Introduction
+
+After weeks of anticipation, you and your friends get together for your very first game of [Dungeons & Dragons][dnd] (D&D).
+Since this is the first session of the game, each player has to generate a character to play with.
+The character's abilities are determined by rolling 6-sided dice, but where _are_ the dice?
+With a shock, you realize that your friends are waiting for _you_ to produce the dice; after all it was your idea to play D&D!
+Panicking, you realize you forgot to bring the dice, which would mean no D&D game.
+As you have some basic coding skills, you quickly come up with a solution: you'll write a program to simulate dice rolls.
+
+[dnd]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons

exercises/practice/dnd-character/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "jimmytty"
+  ],
+  "files": {
+    "solution": [
+      "dnd-character.sql"
+    ],
+    "test": [
+      "dnd-character_test.sql"
+    ],
+    "example": [
+      ".meta/example.sql"
+    ]
+  },
+  "blurb": "Randomly generate Dungeons & Dragons characters.",
+  "source": "Simon Shine, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945"
+}

exercises/practice/dnd-character/.meta/example.sql

@@ -0,0 +1,104 @@
+UPDATE "dnd-character"
+   SET modifier = FLOOR((constitution - 10) / 2.0)
+ WHERE property = 'modifier'
+   AND input    = 'score'
+       ;
+
+UPDATE "dnd-character"
+   SET wisdom = (
+     SELECT SUM(score)
+       FROM (
+         SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+           FROM generate_series(1, 4) AS times
+          ORDER BY score DESC
+          LIMIT 3
+       )
+   )
+ WHERE property = 'ability'
+   AND input    = 'random'
+       ;
+
+
+UPDATE "dnd-character"
+   SET
+     strength = (
+       SELECT SUM(score)
+         FROM (
+           SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+             FROM generate_series(1, 4) AS times
+            ORDER BY score DESC
+            LIMIT 3
+         )
+     ),
+     dexterity = (
+       SELECT SUM(score)
+         FROM (
+           SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+             FROM generate_series(1, 4) AS times
+            ORDER BY score DESC
+            LIMIT 3
+         )
+     ),
+     constitution = (
+       SELECT SUM(score)
+         FROM (
+           SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+             FROM generate_series(1, 4) AS times
+            ORDER BY score DESC
+            LIMIT 3
+         )
+     ),
+     intelligence = (
+       SELECT SUM(score)
+         FROM (
+           SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+             FROM generate_series(1, 4) AS times
+            ORDER BY score DESC
+            LIMIT 3
+         )
+     ),
+     wisdom = (
+       SELECT SUM(score)
+         FROM (
+           SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+             FROM generate_series(1, 4) AS times
+            ORDER BY score DESC
+            LIMIT 3
+         )
+     ),
+     charisma = (
+       SELECT SUM(score)
+         FROM (
+           SELECT ABS(RANDOM()) % (6 - 1) + 1 AS score
+             FROM generate_series(1, 4) AS times
+            ORDER BY score DESC
+            LIMIT 3
+         )
+     )
+ WHERE property = 'character'
+   AND input    = 'random'
+       ;
+UPDATE "dnd-character"
+   SET modifier = FLOOR((constitution - 10) / 2.0)
+ WHERE property = 'character'
+   AND input    = 'random'
+       ;
+UPDATE "dnd-character"
+   SET hitpoints = 10 + modifier
+ WHERE property = 'character'
+   AND input    = 'random'
+       ;
+
+UPDATE "dnd-character" AS a
+   SET strength     = b.strength,
+       dexterity    = b.dexterity,
+       constitution = b.constitution,
+       intelligence = b.intelligence,
+       wisdom       = b.wisdom,
+       charisma     = b.charisma
+  FROM "dnd-character" AS b
+ WHERE a.property = b.property
+   AND a.property = 'character'
+   AND a.input    = ''
+   AND b.input    = 'random'
+;

exercises/practice/dnd-character/.meta/tests.toml

@@ -0,0 +1,72 @@
+# 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.
+
+[1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37]
+description = "ability modifier -> ability modifier for score 3 is -4"
+
+[cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c]
+description = "ability modifier -> ability modifier for score 4 is -3"
+
+[5b519fcd-6946-41ee-91fe-34b4f9808326]
+description = "ability modifier -> ability modifier for score 5 is -3"
+
+[dc2913bd-6d7a-402e-b1e2-6d568b1cbe21]
+description = "ability modifier -> ability modifier for score 6 is -2"
+
+[099440f5-0d66-4b1a-8a10-8f3a03cc499f]
+description = "ability modifier -> ability modifier for score 7 is -2"
+
+[cfda6e5c-3489-42f0-b22b-4acb47084df0]
+description = "ability modifier -> ability modifier for score 8 is -1"
+
+[c70f0507-fa7e-4228-8463-858bfbba1754]
+description = "ability modifier -> ability modifier for score 9 is -1"
+
+[6f4e6c88-1cd9-46a0-92b8-db4a99b372f7]
+description = "ability modifier -> ability modifier for score 10 is 0"
+
+[e00d9e5c-63c8-413f-879d-cd9be9697097]
+description = "ability modifier -> ability modifier for score 11 is 0"
+
+[eea06f3c-8de0-45e7-9d9d-b8cab4179715]
+description = "ability modifier -> ability modifier for score 12 is +1"
+
+[9c51f6be-db72-4af7-92ac-b293a02c0dcd]
+description = "ability modifier -> ability modifier for score 13 is +1"
+
+[94053a5d-53b6-4efc-b669-a8b5098f7762]
+description = "ability modifier -> ability modifier for score 14 is +2"
+
+[8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2]
+description = "ability modifier -> ability modifier for score 15 is +2"
+
+[c3ec871e-1791-44d0-b3cc-77e5fb4cd33d]
+description = "ability modifier -> ability modifier for score 16 is +3"
+
+[3d053cee-2888-4616-b9fd-602a3b1efff4]
+description = "ability modifier -> ability modifier for score 17 is +3"
+
+[bafd997a-e852-4e56-9f65-14b60261faee]
+description = "ability modifier -> ability modifier for score 18 is +4"
+
+[4f28f19c-2e47-4453-a46a-c0d365259c14]
+description = "random ability is within range"
+
+[385d7e72-864f-4e88-8279-81a7d75b04ad]
+description = "random character is valid"
+
+[2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe]
+description = "each ability is only calculated once"
+include = false
+
+[dca2b2ec-f729-4551-84b9-078876bb4808]
+description = "each ability is only calculated once"
+reimplements = "2ca77b9b-c099-46c3-a02c-0d0f68ffa0fe"

exercises/practice/dnd-character/create_fixture.sql

@@ -0,0 +1,25 @@
+DROP TABLE IF EXISTS "dnd-character";
+CREATE TABLE "dnd-character" (
+  property     TEXT    NOT NULL,
+  input        TEXT    NOT NULL,
+  strength     INTEGER         ,
+  dexterity    INTEGER         ,
+  constitution INTEGER         ,
+  intelligence INTEGER         ,
+  wisdom       INTEGER         ,
+  charisma     INTEGER         ,
+  modifier     INTEGER         ,
+  hitpoints    INTEGER
+);
+
+.mode csv
+.import ./data.csv "dnd-character"
+
+UPDATE "dnd-character" SET strength     = NULL WHERE strength     = '';
+UPDATE "dnd-character" SET dexterity    = NULL WHERE dexterity    = '';
+UPDATE "dnd-character" SET constitution = NULL WHERE constitution = '';
+UPDATE "dnd-character" SET intelligence = NULL WHERE intelligence = '';
+UPDATE "dnd-character" SET wisdom       = NULL WHERE wisdom       = '';
+UPDATE "dnd-character" SET charisma     = NULL WHERE charisma     = '';
+UPDATE "dnd-character" SET modifier     = NULL WHERE modifier     = '';
+UPDATE "dnd-character" SET hitpoints    = NULL WHERE hitpoints    = '';

exercises/practice/dnd-character/create_test_table.sql

@@ -0,0 +1,48 @@
+DROP TABLE IF EXISTS tests;
+CREATE TABLE IF NOT EXISTS tests (
+  -- uuid and description are taken from the test.toml file
+  uuid TEXT PRIMARY KEY,
+  description TEXT NOT NULL,
+  -- The following section is needed by the online test-runner
+  status TEXT DEFAULT 'fail',
+  message TEXT,
+  output TEXT,
+  test_code TEXT,
+  task_id INTEGER DEFAULT NULL,
+  -- Here are columns for the actual tests
+  property TEXT NOT NULL,
+  input TEXT NOT NULL,
+  constitution INTEGER,
+  modifier INTEGER,
+  expected TEXT NOT NULL
+);
+
+INSERT INTO tests (
+  uuid,
+  description,
+  property,
+  input,
+  constitution,
+  modifier,
+  expected
+)
+VALUES
+('1e9ae1dc-35bd-43ba-aa08-e4b94c20fa37', 'ability modifier for score 3 is -4', 'modifier', 'score', 3, -4, ''),
+('cc9bb24e-56b8-4e9e-989d-a0d1a29ebb9c', 'ability modifier for score 4 is -3', 'modifier', 'score', 4, -3, ''),
+('5b519fcd-6946-41ee-91fe-34b4f9808326', 'ability modifier for score 5 is -3', 'modifier', 'score', 5, -3, ''),
+('dc2913bd-6d7a-402e-b1e2-6d568b1cbe21', 'ability modifier for score 6 is -2', 'modifier', 'score', 6, -2, ''),
+('099440f5-0d66-4b1a-8a10-8f3a03cc499f', 'ability modifier for score 7 is -2', 'modifier', 'score', 7, -2, ''),
+('cfda6e5c-3489-42f0-b22b-4acb47084df0', 'ability modifier for score 8 is -1', 'modifier', 'score', 8, -1, ''),
+('c70f0507-fa7e-4228-8463-858bfbba1754', 'ability modifier for score 9 is -1', 'modifier', 'score', 9, -1, ''),
+('6f4e6c88-1cd9-46a0-92b8-db4a99b372f7', 'ability modifier for score 10 is 0', 'modifier', 'score', 10, 0, ''),
+('e00d9e5c-63c8-413f-879d-cd9be9697097', 'ability modifier for score 11 is 0', 'modifier', 'score', 11, 0, ''),
+('eea06f3c-8de0-45e7-9d9d-b8cab4179715', 'ability modifier for score 12 is +1', 'modifier', 'score', 12, 1, ''),
+('9c51f6be-db72-4af7-92ac-b293a02c0dcd', 'ability modifier for score 13 is +1', 'modifier', 'score', 13, 1, ''),
+('94053a5d-53b6-4efc-b669-a8b5098f7762', 'ability modifier for score 14 is +2', 'modifier', 'score', 14, 2, ''),
+('8c33e7ca-3f9f-4820-8ab3-65f2c9e2f0e2', 'ability modifier for score 15 is +2', 'modifier', 'score', 15, 2, ''),
+('c3ec871e-1791-44d0-b3cc-77e5fb4cd33d', 'ability modifier for score 16 is +3', 'modifier', 'score', 16, 3, ''),
+('3d053cee-2888-4616-b9fd-602a3b1efff4', 'ability modifier for score 17 is +3', 'modifier', 'score', 17, 3, ''),
+('bafd997a-e852-4e56-9f65-14b60261faee', 'ability modifier for score 18 is +4', 'modifier', 'score', 18, 4, ''),
+('4f28f19c-2e47-4453-a46a-c0d365259c14', 'random ability is within range', 'ability', 'random', NULL, NULL, 'score >= 3 && score <= 18'),
+('385d7e72-864f-4e88-8279-81a7d75b04ad', 'random character is valid', 'character', 'random', NULL, NULL, '{"strength":"strength >= 3 && strength <= 18","dexterity":"dexterity >= 3 && dexterity <= 18","constitution":"constitution >= 3 && constitution <= 18","intelligence":"intelligence >= 3 && intelligence <= 18","wisdom":"wisdom >= 3 && wisdom <= 18","charisma":"charisma >= 3 && charisma <= 18","hitpoints":"hitpoints == 10 + modifier(constitution)"}'),
+('dca2b2ec-f729-4551-84b9-078876bb4808', 'each ability is only calculated once', 'character', '', NULL, NULL, '{"strength":"strength == strength","dexterity":"dexterity == dexterity","constitution":"constitution == constitution","intelligence":"intelligence == intelligence","wisdom":"wisdom == wisdom","charisma":"charisma == charisma"}');

exercises/practice/dnd-character/data.csv

@@ -0,0 +1,19 @@
+"modifier","score",,,3,,,,,
+"modifier","score",,,4,,,,,
+"modifier","score",,,5,,,,,
+"modifier","score",,,6,,,,,
+"modifier","score",,,7,,,,,
+"modifier","score",,,8,,,,,
+"modifier","score",,,9,,,,,
+"modifier","score",,,10,,,,,
+"modifier","score",,,11,,,,,
+"modifier","score",,,12,,,,,
+"modifier","score",,,13,,,,,
+"modifier","score",,,14,,,,,
+"modifier","score",,,15,,,,,
+"modifier","score",,,16,,,,,
+"modifier","score",,,17,,,,,
+"modifier","score",,,18,,,,,
+"ability","random",,,,,,,,
+"character","random",,,,,,,,
+"character","",,,,,,,,

exercises/practice/dnd-character/dnd-character.sql

@@ -0,0 +1,15 @@
+-- Schema:
+-- CREATE TABLE "dnd-character" (
+--   property     TEXT    NOT NULL,
+--   input        TEXT    NOT NULL,
+--   strength     INTEGER         ,
+--   dexterity    INTEGER         ,
+--   constitution INTEGER         ,
+--   intelligence INTEGER         ,
+--   wisdom       INTEGER         ,
+--   charisma     INTEGER         ,
+--   modifier     INTEGER         ,
+--   hitpoints    INTEGER
+-- );
+--
+-- Task: update the dnd-character table and set the appropriate columns based on the property and the input.