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Code golf - stuffing primes in a box

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  1. Object subclass: #Insertion
  2.     instanceVariableNames: 'point isHorizontal numberOfOverlaps accidentalPrimes'
  3.     classVariableNames: ''
  4.     poolDictionaries: ''
  5.     category: 'Amos'!
  6.  
  7. !Insertion methodsFor: 'initialization' stamp: 'AMC 3/24/2016 15:29'!
  8. initialize
  9.  
  10.     super initialize.
  11.     numberOfOverlaps := 0.
  12.     accidentalPrimes := OrderedCollection new! !
  13.  
  14.  
  15. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:55'!
  16. point: aPoint
  17.  
  18.     point := aPoint! !
  19.  
  20. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:56'!
  21. numberOfOverlaps: anInteger
  22.  
  23.     numberOfOverlaps := anInteger! !
  24.  
  25. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:29'!
  26. addAccidentalPrime: aPrime
  27.  
  28.     accidentalPrimes add: aPrime! !
  29.  
  30. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:29'!
  31. accidentalPrimes
  32.  
  33.     ^accidentalPrimes! !
  34.  
  35. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:56'!
  36. numberOfOverlaps
  37.  
  38.     ^numberOfOverlaps! !
  39.  
  40. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:55'!
  41. point
  42.  
  43.     ^point! !
  44.  
  45. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:59'!
  46. increaseOverlaps
  47.  
  48.     numberOfOverlaps := numberOfOverlaps + 1! !
  49.  
  50. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:55'!
  51. isHorizontal
  52.  
  53.     ^isHorizontal! !
  54.  
  55. !Insertion methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:55'!
  56. isHorizontal: aBoolean
  57.  
  58.     isHorizontal := aBoolean! !
  59.  
  60.  
  61. !Insertion methodsFor: 'printing' stamp: 'AMC 3/24/2016 16:19'!
  62. printOn: aStream
  63.  
  64.     aStream
  65.         nextPutAll: 'Insertion at: ';
  66.         nextPutAll: point printString;
  67.         nextPut: Character space;
  68.         nextPut: (isHorizontal ifTrue: [$>] ifFalse: [$v]);
  69.         nextPutAll: ' {';
  70.         nextPutAll: (', ' join: accidentalPrimes);
  71.         nextPut: $}! !
  72.  
  73. "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "!
  74.  
  75. Insertion class
  76.     instanceVariableNames: ''!
  77.  
  78. !Insertion class methodsFor: 'instance creation' stamp: 'AMC 3/24/2016 15:58'!
  79. at: aPoint isHorizontal: aBoolean
  80.  
  81.     ^self new
  82.         point: aPoint;
  83.         isHorizontal: aBoolean;
  84.         yourself! !
  85.  
  87. Object subclass: #Stuffer
  88.     instanceVariableNames: 'box width height'
  89.     classVariableNames: 'primeLoadDictionary primes'
  90.     poolDictionaries: ''
  91.     category: 'Amos'!
  92.  
  93. !Stuffer methodsFor: 'initialization' stamp: 'AMC 3/24/2016 15:48'!
  94. initializeBox
  95.  
  96.     box := Box width: (width min: 5) height: (height min: 5)! !
  97.  
  98.  
  99. !Stuffer methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:49'!
  100. height: anInteger
  101.  
  102.     height := anInteger! !
  103.  
  104. !Stuffer methodsFor: 'accessing' stamp: 'AMC 3/24/2016 16:07'!
  105. box
  106.  
  107.     ^box! !
  108.  
  109. !Stuffer methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:49'!
  110. width: anInteger
  111.  
  112.     width := anInteger! !
  113.  
  114. !Stuffer methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:48'!
  115. width
  116.  
  117.     ^width! !
  118.  
  119. !Stuffer methodsFor: 'accessing' stamp: 'AMC 3/24/2016 16:07'!
  120. box: aBox
  121.  
  122.     box := aBox! !
  123.  
  124. !Stuffer methodsFor: 'accessing' stamp: 'AMC 3/24/2016 14:49'!
  125. height
  126.  
  127.     ^height! !
  128.  
  129.  
  130. !Stuffer methodsFor: 'testing' stamp: 'AMC 3/24/2016 14:50'!
  131. canGrow
  132.  
  133.     ^width > box width or: [height > box height]! !
  134.  
  135.  
  136. !Stuffer methodsFor: 'stuffing' stamp: 'AMC 3/24/2016 13:23'!
  137. insert: aString at: aPoint horizontalIf: isHorizontal
  138.  
  139.     | point offset |
  140.     point := aPoint.
  141.     offset := isHorizontal ifTrue: [box rightOffset] ifFalse: [box downOffset].
  142.     Transcript crShow: 'Inserting ', aString, ' at ', point printString.
  143.     aString do: [:eachChar |
  144.         box at: point x at: point y put: eachChar.
  145.         point := point + offset
  146.         ].
  147.     Transcript crShow: box! !
  148.  
  149. !Stuffer methodsFor: 'stuffing' stamp: 'AMC 3/24/2016 13:46'!
  150. stuffBox
  151.  
  152.     self stuffCurrentBox.
  153.     [self canGrow] whileTrue: [
  154.         box growMatrixByOneUpTo: width @ height.
  155.         self stuffCurrentBox
  156.         ]! !
  157.  
  158. !Stuffer methodsFor: 'stuffing' stamp: 'AMC 3/24/2016 13:47'!
  159. stuffCurrentBox
  160.  
  161.     self class primes reverseDo: [:eachPrime |
  162.         | string insertion |
  163.         (box primesUsed includes: eachPrime) ifFalse: [
  164.             string := eachPrime asString.
  165.             (insertion := box bestInsertionFor: string)
  166.                 ifNotNil: [
  167.                     Transcript crShow: insertion printString, ' of ', string.
  168.                     box doInsertion: insertion of: eachPrime.
  169.                     Transcript crShow: box
  170.                     ]
  171.                 ]
  172.             ].
  173.     box updatePrimesUsed.! !
  174.  
  175. "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "!
  176.  
  177. Stuffer class
  178.     instanceVariableNames: ''!
  179.  
  180. !Stuffer class methodsFor: 'primes' stamp: 'AMC 3/24/2016 16:32'!
  181. primeMaxLength
  182.     "self primeMaxLength"
  183.  
  184.     ^self primes last asString size! !
  185.  
  186. !Stuffer class methodsFor: 'primes' stamp: 'AMC 3/25/2016 18:11'!
  187. primeLoadDictionary
  188.     "self primeLoadDictionary"
  189.  
  190.     primeLoadDictionary ifNil: [
  191.         | sum |
  192.         primeLoadDictionary := IdentityDictionary new.
  193.         sum := 0.
  194.         self primes do: [:eachPrime |
  195.             sum := sum + eachPrime asString size.
  196.             primeLoadDictionary at: sum put: eachPrime
  197.             ]
  198.         ].
  199.     ^primeLoadDictionary! !
  200.  
  201. !Stuffer class methodsFor: 'primes' stamp: 'AMC 3/25/2016 18:05'!
  202. maxPrime
  203.  
  204.     ^20000! !
  205.  
  206. !Stuffer class methodsFor: 'primes' stamp: 'AMC 3/24/2016 14:46'!
  207. resetPrimes
  208.     "self resetPrimes"
  209.  
  210.     primes := nil.
  211.     primeLoadDictionary := nil! !
  212.  
  213. !Stuffer class methodsFor: 'primes' stamp: 'AMC 3/24/2016 14:54'!
  214. primes
  215.     "self primes"
  216.  
  217.     primes isNil ifTrue: [
  218.         primes := (Integer primesUpTo: self maxPrime) asOrderedCollection.
  219.         primes removeAll: #(2 3 5 7)
  220.         ].
  221.     ^primes! !
  222.  
  223.  
  224. !Stuffer class methodsFor: 'instance creation' stamp: 'AMC 3/24/2016 13:09'!
  225. forBox: aBox
  226.  
  227.     ^self new
  228.         box: aBox;
  229.         yourself! !
  230.  
  231. !Stuffer class methodsFor: 'instance creation' stamp: 'AMC 3/24/2016 13:54'!
  232. forDimensions: aPoint
  233.  
  234.     ^self new
  235.         width: aPoint x;
  236.         height: aPoint y;
  237.         initializeBox;
  238.         yourself! !
  239.  
  240.  
  242. Object subclass: #Box
  243.     instanceVariableNames: 'matrix primesUsed'
  244.     classVariableNames: ''
  245.     poolDictionaries: ''
  246.     category: 'Amos'!
  247.  
  248. !Box methodsFor: 'convenience' stamp: 'AMC 3/24/2016 14:32'!
  249. rightOffset
  250.  
  251.     ^1@0! !
  252.  
  253. !Box methodsFor: 'convenience' stamp: 'AMC 3/24/2016 14:18'!
  254. width
  255.  
  256.     ^matrix numberOfColumns! !
  257.  
  258. !Box methodsFor: 'convenience' stamp: 'AMC 3/24/2016 14:20'!
  259. pointsDo: aBlock
  260.  
  261.     1 to: self height do: [:eachY |
  262.         1 to: self width do: [:eachX |
  263.             aBlock value: eachX @ eachY
  264.             ]
  265.         ]! !
  266.  
  267. !Box methodsFor: 'convenience' stamp: 'AMC 3/24/2016 14:02'!
  268. offset: isHorizontal
  269.  
  270.     ^isHorizontal
  271.         ifTrue: [self rightOffset]
  272.         ifFalse: [self downOffset]! !
  273.  
  274. !Box methodsFor: 'convenience' stamp: 'AMC 3/24/2016 13:32'!
  275. downOffset
  276.  
  277.     ^0@1! !
  278.  
  279. !Box methodsFor: 'convenience' stamp: 'AMC 3/24/2016 13:17'!
  280. height
  281.  
  282.     ^matrix numberOfRows! !
  283.  
  284.  
  285. !Box methodsFor: 'initialization' stamp: 'AMC 3/24/2016 14:33'!
  286. initialize
  287.  
  288.     super initialize.
  289.     primesUsed := OrderedCollection new! !
  290.  
  291.  
  292. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:47'!
  293. matrix
  294.  
  295.     ^matrix! !
  296.  
  297. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 16:24'!
  298. primesUsed
  299.  
  300.     ^primesUsed! !
  301.  
  302. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 13:54'!
  303. from: aPoint rightBy: aNumber
  304.  
  305.     ^(matrix atRow: aPoint y)
  306.         copyFrom: aPoint x to: (aPoint x + aNumber min: self width)! !
  307.  
  308. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 16:25'!
  309. primesUsed: somePrimes
  310.  
  311.     primesUsed := somePrimes! !
  312.  
  313. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 13:30'!
  314. at: aRowIndex at: aColumnIndex
  315.  
  316.     ^self at: aColumnIndex @ aRowIndex! !
  317.  
  318. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 13:09'!
  319. primesInColumn: aColumnIndex
  320.  
  321.     ^self class primesIn: (matrix atColumn: aColumnIndex)! !
  322.  
  323. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 13:07'!
  324. primesInRow: aRowIndex
  325.  
  326.     ^self class primesIn: (matrix atRow: aRowIndex)! !
  327.  
  328. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 16:02'!
  329. at: aRowIndex at: aColumnIndex put: aCharacter
  330.  
  331.     ^matrix at: aRowIndex at: aColumnIndex put: aCharacter! !
  332.  
  333. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 15:47'!
  334. matrix: aMatrix
  335.  
  336.     matrix := aMatrix! !
  337.  
  338. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 13:42'!
  339. at: aPoint
  340.  
  341.     ^matrix at: aPoint y at: aPoint x ifInvalid: nil! !
  342.  
  343. !Box methodsFor: 'accessing' stamp: 'AMC 3/24/2016 13:53'!
  344. from: aPoint downBy: aNumber
  345.  
  346.     ^(matrix atColumn: aPoint x)
  347.         copyFrom: aPoint y to: (aPoint y + aNumber min: self height)! !
  348.  
  349.  
  350. !Box methodsFor: 'evaluating' stamp: 'AMC 3/24/2016 17:16'!
  351. updatePrimesUsed
  352.  
  353.     Transcript crShow: primesUsed size printString, ' old primes: ', (', ' join: primesUsed).
  354.     primesUsed := OrderedCollection new.
  355.     1 to: self height do: [:each |
  356.         primesUsed addAll: (self primesInRow: each)
  357.         ].
  358.     1 to: self width do: [:each |
  359.         primesUsed addAll: (self primesInColumn: each)
  360.         ].
  361.     primesUsed asBag sortedCounts first key > 1
  362.         ifTrue: [self error: 'Damn dirty duplicates!!'].
  363.     Transcript crShow: primesUsed size printString, ' new primes: ', (', ' join: primesUsed)! !
  364.  
  365. !Box methodsFor: 'evaluating' stamp: 'AMC 3/24/2016 15:05'!
  366. load
  367.  
  368.     ^((matrix size - (matrix occurrencesOf: Character space)) / matrix size) * 100! !
  369.  
  370.  
  371. !Box methodsFor: 'inserting' stamp: 'AMC 3/24/2016 12:59'!
  372. doInsertion: anInsertion of: aPrime
  373.  
  374.     self
  375.         insert: aPrime printString
  376.         at: anInsertion point
  377.         horizontalIf: anInsertion isHorizontal.
  378.     primesUsed
  379.         add: aPrime;
  380.         addAll: anInsertion accidentalPrimes! !
  381.  
  382. !Box methodsFor: 'inserting' stamp: 'AMC 3/24/2016 11:21'!
  383. growMatrixByOneUpTo: aDimension
  384.  
  385.     | smallMatrix rowOffset columnOffset |
  386.     smallMatrix := matrix copy.
  387.     matrix := Matrix
  388.         rows: (self height + 2 min: aDimension y)
  389.         columns: (self width + 2 min: aDimension x)
  390.         element: Character space.
  391.     rowOffset := (self height - smallMatrix numberOfRows) min: 1.
  392.     columnOffset := (self width - smallMatrix numberOfColumns) min: 1.
  393.     self copy: smallMatrix to: (1 + columnOffset) @ (1 + rowOffset)! !
  394.  
  395. !Box methodsFor: 'inserting' stamp: 'AMC 3/25/2016 17:46'!
  396. bestInsertionFor: aString
  397.  
  398.     | insertions |
  399.     insertions := OrderedCollection new.
  400.     self pointsDo: [:eachPoint |
  401.         insertions
  402.             addIfNotNil: (self insertionOf: aString at: eachPoint isHorizontal: true);
  403.             addIfNotNil: (self insertionOf: aString at: eachPoint isHorizontal: false)
  404.         ].
  405.     insertions removeAllSuchThat: [:each |
  406.         self isInsertion: each invalidWith: aString asInteger
  407.         ].
  408.     ^insertions detectMax: [:each |
  409.         (each accidentalPrimes size * 1) + (each numberOfOverlaps * 2)
  410.         ]! !
  411.  
  412. !Box methodsFor: 'inserting' stamp: 'AMC 3/24/2016 11:08'!
  413. copy: aMatrix to: aPoint
  414.  
  415.     matrix
  416.         atRows: aPoint y
  417.         to: aPoint y + aMatrix numberOfRows - 1
  418.         columns: aPoint x
  419.         to: aPoint x + aMatrix numberOfColumns - 1
  420.         put: aMatrix! !
  421.  
  422. !Box methodsFor: 'inserting' stamp: 'AMC 3/24/2016 12:51'!
  423. insertionOf: aString at: aPoint isHorizontal: isHorizontal
  424.  
  425.     | point insertion |
  426.     point := aPoint.
  427.     (self canFitEndsAt: point length: aString size isHorizontal: isHorizontal)
  428.         ifFalse: [^nil].
  429.     (self isAlreadyThere: aString at: aPoint isHorizontal: isHorizontal)
  430.         ifTrue: [^nil].
  431.     insertion := Insertion at: point isHorizontal: isHorizontal.
  432.     1 to: aString size do: [:eachIndex |
  433.         | eachCharacter |
  434.         eachCharacter := aString at: eachIndex.
  435.         (self canDoInsertion: insertion of: eachCharacter at: point)
  436.             ifTrue: [
  437.                 (self at: point) == eachCharacter
  438.                     ifTrue: [insertion increaseOverlaps].
  439.                 point := point + (self offset: isHorizontal)
  440.                 ]
  441.             ifFalse: [^nil]
  442.         ].
  443.     ^insertion! !
  444.  
  445. !Box methodsFor: 'inserting' stamp: 'AMC 3/24/2016 14:19'!
  446. insert: aString at: aPoint horizontalIf: isHorizontal
  447.  
  448.     | point offset |
  449.     point := aPoint.
  450.     offset := isHorizontal ifTrue: [self rightOffset] ifFalse: [self downOffset].
  451.     aString do: [:eachChar |
  452.         self at: point y at: point x put: eachChar.
  453.         point := point + offset
  454.         ]! !
  455.  
  456.  
  457. !Box methodsFor: 'testing' stamp: 'AMC 3/25/2016 16:11'!
  458. isInsertion: anInsertion invalidWith: aPrime
  459.  
  460.     | otherPrimes |
  461.     otherPrimes := anInsertion accidentalPrimes.
  462.     ^(primesUsed includesAny: otherPrimes)
  463.         or: [(otherPrimes includes: aPrime)
  464.         or: [otherPrimes copy removeDuplicates size < otherPrimes size]]! !
  465.  
  466. !Box methodsFor: 'testing' stamp: 'AMC 3/24/2016 15:39'!
  467. canFitEndsAt: aPoint length: aLength isHorizontal: isHorizontal
  468.  
  469.     | before after |
  470.     before := isHorizontal
  471.         ifTrue: [aPoint - self rightOffset]
  472.         ifFalse: [aPoint - self downOffset].
  473.     after := isHorizontal
  474.         ifTrue: [(aPoint x + aLength) @ aPoint y]
  475.         ifFalse: [aPoint x @ (aPoint y + aLength)].
  476.     ^(self isFreeOrBorder: before) and: [self isFreeOrBorder: after]! !
  477.  
  478. !Box methodsFor: 'testing' stamp: 'AMC 3/24/2016 14:49'!
  479. isFreeOrBorder: aPoint
  480.  
  481.     ^(self isBorder: aPoint)
  482.         or: [self isFreeAt: aPoint]! !
  483.  
  484. !Box methodsFor: 'testing' stamp: 'AMC 3/24/2016 16:24'!
  485. canDoInsertion: anInsertion of: aCharacter at: aPoint
  486.     "Answer whether anInsertion of aCharacter is valid at aPoint. If so,
  487.     also update anInsertion with any accidental insertions."
  488.  
  489.     | perpendicularSequence offset front back |
  490.     (self at: aPoint) == aCharacter
  491.         ifTrue: [^true].
  492.     (self isFreeAt: aPoint)
  493.         ifFalse: [^false].
  494.     perpendicularSequence := OrderedCollection with: aCharacter.
  495.     offset := self offset: anInsertion isHorizontal not.
  496.     front := aPoint - offset.
  497.     back := aPoint + offset.
  498.     [self isFreeOrBorder: front] whileFalse: [
  499.         perpendicularSequence addFirst: (self at: front).
  500.         front := front - offset
  501.         ].
  502.     [self isFreeOrBorder: back] whileFalse: [
  503.         perpendicularSequence addLast: (self at: back).
  504.         back := back + offset
  505.         ].
  506.     ^perpendicularSequence size == 1
  507.         or: [
  508.             | string number |
  509.             string := String withAll: perpendicularSequence.
  510.             number := string asInteger.
  511.             (string first ~~ $0 and: [number isPrime])
  512.                 ifTrue: [anInsertion addAccidentalPrime: number. true]
  513.                 ifFalse: [false]
  514.             ]! !
  515.  
  516. !Box methodsFor: 'testing' stamp: 'AMC 3/24/2016 14:50'!
  517. isBorder: aPoint
  518.  
  519.     ^(aPoint x == 0)
  520.         or: [aPoint x == (self width + 1)
  521.         or: [aPoint y == 0
  522.         or: [aPoint y == (self height + 1)]]]! !
  523.  
  524. !Box methodsFor: 'testing' stamp: 'AMC 3/25/2016 16:46'!
  525. isFreeAt: aPoint
  526.  
  527.     ^(self at: aPoint) == Character space! !
  528.  
  529. !Box methodsFor: 'testing' stamp: 'AMC 3/24/2016 16:08'!
  530. isAlreadyThere: aString at: aPoint isHorizontal: isHorizontal
  531.  
  532.     | currentString |
  533.     currentString := isHorizontal
  534.         ifTrue: [self from: aPoint rightBy: aString size]
  535.         ifFalse: [self from: aPoint downBy: aString size].
  536.     ^aString = currentString! !
  537.  
  538.  
  539. !Box methodsFor: 'printing' stamp: 'AMC 3/24/2016 14:46'!
  540. primesUsedPrintString
  541.  
  542.     ^primesUsed size printString, (' prime' asPluralBasedOn: primesUsed)! !
  543.  
  544. !Box methodsFor: 'printing' stamp: 'AMC 3/24/2016 14:45'!
  545. loadPrintString
  546.  
  547.     ^'load: ', self load asInteger printString, '%'! !
  548.  
  549. !Box methodsFor: 'printing' stamp: 'AMC 3/24/2016 14:44'!
  550. sizePrintString
  551.  
  552.     ^self height printString, 'x', self width printString! !
  553.  
  554. !Box methodsFor: 'printing' stamp: 'AMC 3/25/2016 17:18'!
  555. printOn: aStream
  556.  
  557.     aStream
  558.         nextPutAll: 'Box ';
  559.         nextPutAll: self sizePrintString;
  560.         nextPutAll: ' (';
  561.         nextPutAll: self primesUsedPrintString;
  562.         nextPutAll: ', ';
  563.         nextPutAll: self loadPrintString;
  564.         nextPutAll: '):';
  565.         nextPut: Character cr.
  566.     1 to: self height do: [ :eachY |
  567.         aStream nextPut: $|.
  568.         1 to: self width do: [ :eachX |
  569.             aStream nextPut: (self at: eachX @ eachY)
  570.             ].
  571.         aStream nextPut: $|.
  572.         aStream nextPut: Character cr
  573.         ]
  574. ! !
  575.  
  576. "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "!
  577.  
  578. Box class
  579.     instanceVariableNames: ''!
  580.  
  581. !Box class methodsFor: 'instance creation' stamp: 'AMC 3/24/2016 15:48'!
  582. width: aWidth height: aHeight
  583.  
  584.     | matrix |
  585.     matrix := Matrix rows: aHeight columns: aWidth element: Character space.
  586.     ^self newWith: matrix! !
  587.  
  588. !Box class methodsFor: 'instance creation' stamp: 'AMC 3/24/2016 15:47'!
  589. newWith: aMatrix
  590.  
  591.     ^self new
  592.         matrix: aMatrix;
  593.         yourself! !
  594.  
  595.  
  596. !Box class methodsFor: 'primes' stamp: 'AMC 3/24/2016 14:33'!
  597. primesIn: aString
  598.  
  599.     ^((aString splitOn: Character space)
  600.         collect: [:each | (String withAll: each) asInteger])
  601.             select: [:each |
  602.                 each notNil and: [
  603.                     (each > 9 and: [each isPrime not])
  604.                         ifTrue: [self error: 'Caught unexpected non-prime: ', each printString].
  605.                     each > 9
  606.                     ]
  607.                 ]! !
  608. 'From Pharo4.0 of 18 March 2013 [Latest update: #40626] on 25 March 2016 at 10:19:38.616703 pm'!
  609.  
  610. !Collection methodsFor: '*Amos' stamp: 'AMC 3/24/2016 14:52'!
  611. addIfNotNil: anElement
  612.  
  613.     anElement ifNotNil: [self add: anElement]! !
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