The Trunk: Collections-ul.515.mcz

Levente Uzonyi uploaded a new version of Collections to project The Trunk:
http://source.squeak.org/trunk/Collections-ul.515.mcz

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

Name: Collections-ul.515
Author: ul
Time: 27 April 2013, 10:20:14.97 pm
UUID: fcc2326f-4e72-46f2-b4b7-352227d94b21
Ancestors: Collections-fbs.514

- a slightly faster (~20%) and simpler (IMHO) implementation of String >> #numArgs

=============== Diff against Collections-fbs.514 ===============

Item was changed:
  ----- Method: String>>numArgs (in category 'accessing') -----
  numArgs
  "Answer either the number of arguments that the receiver would take if considered a selector.  Answer -1 if it couldn't be a selector. It is intended mostly for the assistance of spelling correction."
 
+ | numColons index size |
+ (size := self size) = 0 ifTrue: [ ^-1 ].
+ index := 1.
+ (self at: index) isSpecial ifTrue: [
+ 2 to: size do: [ :i | (self at: i) isSpecial ifFalse: [ ^-1 ] ].
- | firstChar numColons start ix |
- self size = 0 ifTrue: [ ^-1 ].
- firstChar := self at: 1.
- firstChar isSpecial ifTrue: [
- 2 to: self size do: [ :i | (self at: i) isSpecial ifFalse: [ ^-1 ] ].
  ^1 ].
  self canBeToken ifFalse: [ ^-1 ].
  "Fast colon count"
  numColons := 0.
+ [
+ (self at: index) isLetter ifFalse: [ ^-1 ].
+ (index := (self indexOf: $: startingAt: index) + 1) > 1 ifFalse: [
+ numColons = 0 ifTrue: [ ^0 ].
+ ^-1 ].
- start := 1.
- [firstChar isLetter ifFalse: [ ^-1 ].
- (ix := self indexOf: $: startingAt: start) > 0 ] whileTrue: [
  numColons := numColons + 1.
+ index <= size ] whileTrue.
- (start := ix + 1) > self size ifFalse: [firstChar := self at: start]].
- (numColons > 0 and: [ self last ~= $: ]) ifTrue: [ ^-1 ].
  ^numColons!