A new version of Collections was added to project The Inbox:
http://source.squeak.org/inbox/Collections-nice.530.mcz

==================== Summary ====================

Name: Collections-nice.530
Author: nice
Time: 4 September 2013, 2:21:28.852 am
UUID: d732aa23-1c77-4c1e-abc0-d8d4506b7f9f
Ancestors: Collections-ul.529

Fix this:
  self assert: (allSymbols select: [:s | s = '+']) size = 1.

1) It is un-necessary to enumerate the 1-char symbols, they already are in SymbolTable (the first time they were created via #findIntern: or by virtue of last #rehash) !

2) We can use a WeekArray rather than an Array because there is no point in keeping a reference to unused 1-char symbols.

Maybe we should get rid of OneCharacterSymbols class var, but I didn't dare...

=============== Diff against Collections-ul.529 ===============

Item was changed:
  ----- Method: Symbol class>>allSymbols (in category 'access') -----
  allSymbols
  	"Answer all interned symbols"
  	^Array streamContents:[:s|
  		s nextPutAll: NewSymbols.
- 		s nextPutAll: OneCharacterSymbols.
  		s nextPutAll: SymbolTable.
  	].
  !

Item was changed:
  ----- Method: Symbol class>>initialize (in category 'class initialization') -----
  initialize
  
  	"Symbol initialize"
  
  	Symbol rehash.
+ 	OneCharacterSymbols := WeakArray new: 256.
+ 	(0 to: 255) do: [ :byte | byte asCharacter asSymbol].
- 	OneCharacterSymbols := nil.
- 	OneCharacterSymbols := (1 to: 256) collect: [ :i | (i - 1) asCharacter asSymbol].
  	Smalltalk addToShutDownList: self.
  !

Item was changed:
  ----- Method: Symbol class>>internCharacter: (in category 'instance creation') -----
  internCharacter: aCharacter
  	aCharacter asciiValue > 256 ifTrue:[^self intern: aCharacter asString].
+ 	^(OneCharacterSymbols at: aCharacter asciiValue + 1) ifNil: [OneCharacterSymbols at: aCharacter asciiValue + 1 put: (self intern: aCharacter asString)]
- 	OneCharacterSymbols ifNil: [^self intern: aCharacter asString].
- 	^OneCharacterSymbols at: aCharacter asciiValue + 1
  !

Item was changed:
  ----- Method: Symbol class>>selectorsContaining: (in category 'access') -----
  selectorsContaining: aString
  	"Answer a list of selectors that contain aString within them. Case-insensitive.  Does return symbols that begin with a capital letter."
  
  	| size selectorList ascii |
  
  	selectorList := OrderedCollection new.
  	(size := aString size) = 0 ifTrue: [^selectorList].
  
  	aString size = 1 ifTrue:
  		[
  			ascii := aString first asciiValue.
+ 			ascii < 128 ifTrue: [(OneCharacterSymbols at: ascii+1) ifNotNil: [:s | selectorList add: s]]
- 			ascii < 128 ifTrue: [selectorList add: (OneCharacterSymbols at: ascii+1)]
  		].
  
  	(aString first isLetter or: [aString first isDigit]) ifFalse:
  		[
  			aString size = 2 ifTrue: 
  				[Symbol hasInterned: aString ifTrue:
  					[:s | selectorList add: s]].
  			^selectorList
  		].
  
  	selectorList := selectorList copyFrom: 2 to: selectorList size.
  
  	self allSymbolTablesDo: [:each |
  		each size >= size ifTrue:
  			[(each findSubstring: aString in: each startingAt: 1 
  				matchTable: CaseInsensitiveOrder) > 0
  						ifTrue: [selectorList add: each]]].
  
  	^selectorList reject: [:each | "reject non-selectors, but keep ones that begin with an uppercase"
  		each numArgs < 0 and: [each asString withFirstCharacterDownshifted numArgs < 0]].
  
  "Symbol selectorsContaining: 'scon'"!