Add ocr-numbers exercise (#129)

config.json

@@ -586,6 +586,14 @@
         "prerequisites": [],
         "difficulty": 6
       },
+      {
+        "slug": "ocr-numbers",
+        "name": "OCR Numbers",
+        "uuid": "c4ffd3ea-1586-4fb0-9738-f4a0d232e118",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 6
+      },
       {
         "slug": "parallel-letter-frequency",
         "name": "Parallel Letter Frequency",

exercises/practice/ocr-numbers/.docs/instructions.md

@@ -0,0 +1,79 @@
+# Instructions
+
+Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
+
+## Step One
+
+To begin with, convert a simple binary font to a string containing 0 or 1.
+
+The binary font uses pipes and underscores, four rows high and three columns wide.
+
+```text
+     _   #
+    | |  # zero.
+    |_|  #
+         # the fourth row is always blank
+```
+
+Is converted to "0"
+
+```text
+         #
+      |  # one.
+      |  #
+         # (blank fourth row)
+```
+
+Is converted to "1"
+
+If the input is the correct size, but not recognizable, your program should return '?'
+
+If the input is the incorrect size, your program should return an error.
+
+## Step Two
+
+Update your program to recognize multi-character binary strings, replacing garbled numbers with ?
+
+## Step Three
+
+Update your program to recognize all numbers 0 through 9, both individually and as part of a larger string.
+
+```text
+ _
+ _|
+|_
+
+```
+
+Is converted to "2"
+
+```text
+      _  _     _  _  _  _  _  _  #
+    | _| _||_||_ |_   ||_||_|| | # decimal numbers.
+    ||_  _|  | _||_|  ||_| _||_| #
+                                 # fourth line is always blank
+```
+
+Is converted to "1234567890"
+
+## Step Four
+
+Update your program to handle multiple numbers, one per line.
+When converting several lines, join the lines with commas.
+
+```text
+    _  _
+  | _| _|
+  ||_  _|
+
+    _  _
+|_||_ |_
+  | _||_|
+
+ _  _  _
+  ||_||_|
+  ||_| _|
+
+```
+
+Is converted to "123,456,789".

exercises/practice/ocr-numbers/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "ocr-numbers.ua"
+    ],
+    "test": [
+      "tests.ua"
+    ],
+    "example": [
+      ".meta/example.ua"
+    ]
+  },
+  "blurb": "Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.",
+  "source": "Inspired by the Bank OCR kata",
+  "source_url": "https://codingdojo.org/kata/BankOCR/"
+}

exercises/practice/ocr-numbers/.meta/example.ua

@@ -0,0 +1,31 @@
+Shapes ← [
+  "   "
+  "  |"
+  " _ "
+  " _|"
+  "| |"
+  "|_ "
+  "|_|"
+]
+Encodings ← [
+  2_4_6_0
+  0_1_1_0
+  2_3_5_0
+  2_3_3_0
+  0_6_1_0
+  2_5_3_0
+  2_5_6_0
+  2_1_1_0
+  2_6_6_0
+  2_6_3_0
+]
+Encoding ← ≡(⊗⟜Shapes)
+Lines    ← ≡(↙4↘)×4⊙¤⇡÷4⊢△.
+Digits   ← ≡≡(↙3↘)×3⊙¤⇡÷3⊣△.
+Number   ← ⨬("?"|°⋕) <10. ⊗⟜Encodings Encoding
+Numbers  ← /⊂≡Number Digits
+Validate ← ⊃(
+  ⍤"Number of input lines is not a multiple of four"=0◿4⊢
+| ⍤"Number of input columns is not a multiple of three"=0◿3⊣
+) △
+Convert ← /$"_,_" ≡Numbers Lines ⊸Validate

exercises/practice/ocr-numbers/.meta/tests.toml

@@ -0,0 +1,61 @@
+# 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.
+
+[5ee54e1a-b554-4bf3-a056-9a7976c3f7e8]
+description = "Recognizes 0"
+
+[027ada25-17fd-4d78-aee6-35a19623639d]
+description = "Recognizes 1"
+
+[3cce2dbd-01d9-4f94-8fae-419a822e89bb]
+description = "Unreadable but correctly sized inputs return ?"
+
+[cb19b733-4e36-4cf9-a4a1-6e6aac808b9a]
+description = "Input with a number of lines that is not a multiple of four raises an error"
+
+[235f7bd1-991b-4587-98d4-84206eec4cc6]
+description = "Input with a number of columns that is not a multiple of three raises an error"
+
+[4a841794-73c9-4da9-a779-1f9837faff66]
+description = "Recognizes 110101100"
+
+[70c338f9-85b1-4296-a3a8-122901cdfde8]
+description = "Garbled numbers in a string are replaced with ?"
+
+[ea494ff4-3610-44d7-ab7e-72fdef0e0802]
+description = "Recognizes 2"
+
+[1acd2c00-412b-4268-93c2-bd7ff8e05a2c]
+description = "Recognizes 3"
+
+[eaec6a15-be17-4b6d-b895-596fae5d1329]
+description = "Recognizes 4"
+
+[440f397a-f046-4243-a6ca-81ab5406c56e]
+description = "Recognizes 5"
+
+[f4c9cf6a-f1e2-4878-bfc3-9b85b657caa0]
+description = "Recognizes 6"
+
+[e24ebf80-c611-41bb-a25a-ac2c0f232df5]
+description = "Recognizes 7"
+
+[b79cad4f-e264-4818-9d9e-77766792e233]
+description = "Recognizes 8"
+
+[5efc9cfc-9227-4688-b77d-845049299e66]
+description = "Recognizes 9"
+
+[f60cb04a-42be-494e-a535-3451c8e097a4]
+description = "Recognizes string of decimal numbers"
+
+[b73ecf8b-4423-4b36-860d-3710bdb8a491]
+description = "Numbers separated by empty lines are recognized. Lines are joined by commas."

exercises/practice/ocr-numbers/ocr-numbers.ua

@@ -0,0 +1,3 @@
+# Convert a display of digits to their numeric counterparts
+# Result ? Display
+Convert ← |1 ⊙(⍤"Please implement Convert" 0)

exercises/practice/ocr-numbers/tests.ua

@@ -0,0 +1,161 @@
+~ "ocr-numbers.ua" ~ Convert
+
+# Recognizes 0
+Display ← [
+  " _ "
+  "| |"
+  "|_|"
+  "   "
+]
+⍤⤙≍ "0" Convert Display
+
+# Recognizes 1
+Display ← [
+  "   "
+  "  |"
+  "  |"
+  "   "
+]
+⍤⤙≍ "1" Convert Display
+
+# Unreadable but correctly sized displays return ?
+Display ← [
+  "   "
+  "  _"
+  "  |"
+  "   "
+]
+⍤⤙≍ "?" Convert Display
+
+# Display with a number of lines that is not a multiple of four raises an error
+Display ← [
+  " _ "
+  "| |"
+  "   "
+]
+⍤⤙≍ "Number of input lines is not a multiple of four" ⍣(Convert Display)
+
+# Display with a number of columns that is not a multiple of three raises an error
+Display ← [
+  "    "
+  "   |"
+  "   |"
+  "    "
+]
+⍤⤙≍ "Number of input columns is not a multiple of three" ⍣(Convert Display)
+
+# Recognizes 110101100
+Display ← [
+  "       _     _        _  _ "
+  "  |  || |  || |  |  || || |"
+  "  |  ||_|  ||_|  |  ||_||_|"
+  "                           "
+]
+⍤⤙≍ "110101100" Convert Display
+
+# Garbled numbers in a string are replaced with ?
+Display ← [
+  "       _     _           _ "
+  "  |  || |  || |     || || |"
+  "  |  | _|  ||_|  |  ||_||_|"
+  "                           "
+]
+⍤⤙≍ "11?10?1?0" Convert Display
+
+# Recognizes 2
+Display ← [
+  " _ "
+  " _|"
+  "|_ "
+  "   "
+]
+⍤⤙≍ "2" Convert Display
+
+# Recognizes 3
+Display ← [
+  " _ "
+  " _|"
+  " _|"
+  "   "
+]
+⍤⤙≍ "3" Convert Display
+
+# Recognizes 4
+Display ← [
+  "   "
+  "|_|"
+  "  |"
+  "   "
+]
+⍤⤙≍ "4" Convert Display
+
+# Recognizes 5
+Display ← [
+  " _ "
+  "|_ "
+  " _|"
+  "   "
+]
+⍤⤙≍ "5" Convert Display
+
+# Recognizes 6
+Display ← [
+  " _ "
+  "|_ "
+  "|_|"
+  "   "
+]
+⍤⤙≍ "6" Convert Display
+
+# Recognizes 7
+Display ← [
+  " _ "
+  "  |"
+  "  |"
+  "   "
+]
+⍤⤙≍ "7" Convert Display
+
+# Recognizes 8
+Display ← [
+  " _ "
+  "|_|"
+  "|_|"
+  "   "
+]
+⍤⤙≍ "8" Convert Display
+
+# Recognizes 9
+Display ← [
+  " _ "
+  "|_|"
+  " _|"
+  "   "
+]
+⍤⤙≍ "9" Convert Display
+
+# Recognizes string of decimal numbers
+Display ← [
+  "    _  _     _  _  _  _  _  _ "
+  "  | _| _||_||_ |_   ||_||_|| |"
+  "  ||_  _|  | _||_|  ||_| _||_|"
+  "                              "
+]
+⍤⤙≍ "1234567890" Convert Display
+
+# Numbers separated by empty lines are recognized. Lines are joined by commas.
+Display ← [
+  "    _  _ "
+  "  | _| _|"
+  "  ||_  _|"
+  "         "
+  "    _  _ "
+  "|_||_ |_ "
+  "  | _||_|"
+  "         "
+  " _  _  _ "
+  "  ||_||_|"
+  "  ||_| _|"
+  "         "
+]
+⍤⤙≍ "123,456,789" Convert Display