[ Implementation ] OCR Numbers

config.json

@@ -759,6 +759,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 1
+      },
+      {
+        "slug": "ocr-numbers",
+        "name": "OCR Numbers",
+        "uuid": "00f7b37c-b460-47ed-949e-d62469d8d6d5",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
       }
     ]
   },

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": [
+    "habere-et-dispertire"
+  ],
+  "files": {
+    "solution": [
+      "lib/OcrNumbers.rakumod"
+    ],
+    "test": [
+      "t/ocr-numbers.rakutest"
+    ],
+    "example": [
+      ".meta/solutions/lib/OcrNumbers.rakumod"
+    ]
+  },
+  "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/solutions/lib/OcrNumbers.rakumod

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+unit module OcrNumbers;
+
+sub ascii-to-digits ( $art where { .lines.elems %% 4 and .lines.map( *.chars ).all %% 3 } ) is export {
+  constant $NUMBERS = q:to/0123456789/;
+   _     _  _     _  _  _  _  _ 
+  | |  | _| _||_||_ |_   ||_||_|
+  |_|  ||_  _|  | _||_|  ||_| _|
+
+  0123456789
+  constant %LOOKUP = ^10 RZ=> ( map *.join( "\n" ), zip $NUMBERS.lines.map( *.comb ).map: *.rotor: 3 );
+
+  join ',', gather for $art.lines.rotor: 4 {
+    take join '',
+    map { .defined ?? $_ !! '?' },
+    %LOOKUP{
+      map *.join( "\n" ), zip .map( *.comb ).map: *.rotor: 3
+    }
+  }
+}

exercises/practice/ocr-numbers/.meta/solutions/t/ocr-numbers.rakutest

@@ -0,0 +1 @@
+../../../t/ocr-numbers.rakutest

exercises/practice/ocr-numbers/.meta/template-data.yaml

@@ -0,0 +1,50 @@
+properties:
+  convert:
+    test: |-
+      if %case<expected><error>:exists {
+        sprintf(q :to/END/, "\n  " ~ %case<input><rows>.join("\n  ").Str, %case<description>.raku);
+          dies-ok( {
+            ascii-to-digits(q:to/SOUPÇON/)%s
+            SOUPÇON
+            },
+            %s,
+          );
+          END
+      }
+      else {
+        sprintf(q :to/END/, "\n  " ~ %case<input><rows>.join("\n  ").Str, %case<expected>.Str, %case<description>.raku);
+          cmp-ok(
+            ascii-to-digits(q:to/SOUPÇON/)%s
+            SOUPÇON
+            ,
+            'eq',
+            '%s',
+            %s,
+          );
+          END
+      }
+
+unit: module
+example: |-
+  sub ascii-to-digits ( $art where { .lines.elems %% 4 and .lines.map( *.chars ).all %% 3 } ) is export {
+    constant $NUMBERS = q:to/0123456789/;
+     _     _  _     _  _  _  _  _ 
+    | |  | _| _||_||_ |_   ||_||_|
+    |_|  ||_  _|  | _||_|  ||_| _|
+
+    0123456789
+    constant %LOOKUP = ^10 RZ=> ( map *.join( "\n" ), zip $NUMBERS.lines.map( *.comb ).map: *.rotor: 3 );
+
+    join ',', gather for $art.lines.rotor: 4 {
+      take join '',
+      map { .defined ?? $_ !! '?' },
+      %LOOKUP{
+        map *.join( "\n" ), zip .map( *.comb ).map: *.rotor: 3
+      }
+    }
+  }
+
+stub: |-
+  sub ascii-to-digits ( $art ) is export {
+  }
+

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/lib/OcrNumbers.rakumod

@@ -0,0 +1,4 @@
+unit module OcrNumbers;
+
+sub ascii-to-digits ( $art ) is export {
+}