" # OcrNumbers # Description 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"". ## Instructions append The following text could be parsed from this comment and used to recognize characters: ' _ _ _ _ _ _ _ _ ' ' | _| _||_||_ |_ ||_||_|| |' ' ||_ _| | _||_| ||_| _||_|' ' ' " Class { #name : 'OcrNumbersTest', #superclass : 'ExercismTest', #instVars : [ 'ocrNumbers' ], #category : 'Exercise@OcrNumbers', #package : 'Exercise@OcrNumbers' } { #category : 'config' } OcrNumbersTest class >> exercise [ "Answer the configured exercise meta data for this exercise, an ExercismExercise" ^(ExercismExercise for: self) difficulty: 6; topics: #('matrices' 'parsing' 'pattern_recognition'); yourself ] { #category : 'config' } OcrNumbersTest class >> uuid [ "Answer a unique id for this exercise" ^'d586e915-466a-4806-8a00-7f325aabd493' ] { #category : 'config' } OcrNumbersTest class >> version [ "Generated from specification: 6 April 2025" ^'Not specified' ] { #category : 'running' } OcrNumbersTest >> setUp [ super setUp. ocrNumbers := OcrNumbers from: self class comment ] { #category : 'tests' } OcrNumbersTest >> test01_Recognizes0 [ "Tip: Remember to review the class [Comment] tab" | result | result := ocrNumbers convertRows: #(' _ ' '| |' '|_|' ' ') . self assert: result equals: '0' ] { #category : 'tests' } OcrNumbersTest >> test02_Recognizes1 [ | result | result := ocrNumbers convertRows: #(' ' ' |' ' |' ' ') . self assert: result equals: '1' ] { #category : 'tests' } OcrNumbersTest >> test03_UnreadableButCorrectlySizedInputsReturn [ | result | result := ocrNumbers convertRows: #(' ' ' _' ' |' ' ') . self assert: result equals: '?' ] { #category : 'tests' } OcrNumbersTest >> test04_InputWithANumberOfLinesThatIsNotAMultipleOfFourRaisesAnError [ | result | self should: [ result := ocrNumbers convertRows: #(' _ ' '| |' ' ') ] raise: Error whoseDescriptionIncludes: 'Number of input lines is not a multiple of four' description: 'Should get an error with the correct description' ] { #category : 'tests' } OcrNumbersTest >> test05_InputWithANumberOfColumnsThatIsNotAMultipleOfThreeRaisesAnError [ | result | self should: [ result := ocrNumbers convertRows: #(' ' ' |' ' |' ' ') ] raise: Error whoseDescriptionIncludes: 'Number of input columns is not a multiple of three' description: 'Should get an error with the correct description' ] { #category : 'tests' } OcrNumbersTest >> test06_Recognizes110101100 [ | result | result := ocrNumbers convertRows: #(' _ _ _ _ ' ' | || | || | | || || |' ' | ||_| ||_| | ||_||_|' ' ') . self assert: result equals: '110101100' ] { #category : 'tests' } OcrNumbersTest >> test07_GarbledNumbersInAStringAreReplacedWith [ | result | result := ocrNumbers convertRows: #(' _ _ _ ' ' | || | || | || || |' ' | | _| ||_| | ||_||_|' ' ') . self assert: result equals: '11?10?1?0' ] { #category : 'tests' } OcrNumbersTest >> test08_Recognizes2 [ | result | result := ocrNumbers convertRows: #(' _ ' ' _|' '|_ ' ' ') . self assert: result equals: '2' ] { #category : 'tests' } OcrNumbersTest >> test09_Recognizes3 [ | result | result := ocrNumbers convertRows: #(' _ ' ' _|' ' _|' ' ') . self assert: result equals: '3' ] { #category : 'tests' } OcrNumbersTest >> test10_Recognizes4 [ | result | result := ocrNumbers convertRows: #(' ' '|_|' ' |' ' ') . self assert: result equals: '4' ] { #category : 'tests' } OcrNumbersTest >> test11_Recognizes5 [ | result | result := ocrNumbers convertRows: #(' _ ' '|_ ' ' _|' ' ') . self assert: result equals: '5' ] { #category : 'tests' } OcrNumbersTest >> test12_Recognizes6 [ | result | result := ocrNumbers convertRows: #(' _ ' '|_ ' '|_|' ' ') . self assert: result equals: '6' ] { #category : 'tests' } OcrNumbersTest >> test13_Recognizes7 [ | result | result := ocrNumbers convertRows: #(' _ ' ' |' ' |' ' ') . self assert: result equals: '7' ] { #category : 'tests' } OcrNumbersTest >> test14_Recognizes8 [ | result | result := ocrNumbers convertRows: #(' _ ' '|_|' '|_|' ' ') . self assert: result equals: '8' ] { #category : 'tests' } OcrNumbersTest >> test15_Recognizes9 [ | result | result := ocrNumbers convertRows: #(' _ ' '|_|' ' _|' ' ') . self assert: result equals: '9' ] { #category : 'tests' } OcrNumbersTest >> test16_RecognizesStringOfDecimalNumbers [ | result | result := ocrNumbers convertRows: #(' _ _ _ _ _ _ _ _ ' ' | _| _||_||_ |_ ||_||_|| |' ' ||_ _| | _||_| ||_| _||_|' ' ') . self assert: result equals: '1234567890' ] { #category : 'tests' } OcrNumbersTest >> test17_NumbersSeparatedByEmptyLinesAreRecognizedLinesAreJoinedByCommas [ | result | result := ocrNumbers convertRows: #(' _ _ ' ' | _| _|' ' ||_ _|' ' ' ' _ _ ' '|_||_ |_ ' ' | _||_|' ' ' ' _ _ _ ' ' ||_||_|' ' ||_| _|' ' ') . self assert: result equals: '123,456,789' ]