Etoys: Kernel-kfr.8.mcz

Karl Ramberg uploaded a new version of Kernel to project Etoys:
http://source.squeak.org/etoys/Kernel-kfr.8.mcz

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

Name: Kernel-kfr.8
Author: kfr
Time: 5 December 2012, 5:07:26 pm
UUID: bb9aaf47-e754-a74d-8e68-1dd799000714
Ancestors: Kernel-bf.7

Fix long standing bug with printing small numbers ie 1.2245678e-16
Copied methods from Squeak 4.4

=============== Diff against Kernel-bf.7 ===============

Item was added:
+ ----- Method: Number>>printOn:showingDecimalPlaces: (in category 'printing') -----
+ printOn: aStream showingDecimalPlaces: placesDesired
+ "Print a representation of the receiver on aStream in decimal notation with prescribed number of places after decimal separator."
+
+ | rounder rounded roundedFractionPart |
+ placesDesired <= 0 ifTrue: [^ self rounded printOn: aStream].
+ rounder := 10 raisedToInteger: placesDesired.
+ rounded := self roundTo: rounder reciprocal.
+ rounded negative ifTrue: [aStream nextPut: $-].
+ rounded := rounded abs.
+ rounded integerPart truncated printOn: aStream.
+ aStream nextPut: $..
+ roundedFractionPart := (rounded fractionPart * rounder) truncated.
+ roundedFractionPart printOn: aStream base: 10 length: placesDesired padded: true!

Item was changed:
  ----- Method: Number>>printShowingDecimalPlaces: (in category 'printing') -----
  printShowingDecimalPlaces: placesDesired
+ "Print the receiver showing precisely the given number of places desired.  If placesDesired is positive, a decimal point and that many digits after the decimal point will always be shown.  If placesDesired is zero, a whole number will be shown, without a decimal point."
- "Print the receiver showing precisely the given number of places desired.  If placesDesired is positive, a decimal point and that many digits after the decimal point will always be shown.  If placesDesired is zero, a whole number will be shown, without a decimal point.  If the nature of the receiver is such that e-notation should be used, that is done."
 
+ ^String new: placesDesired + 10 streamContents: [:aStream |
+ self printOn: aStream showingDecimalPlaces: placesDesired]
- | precision rounded frac sign integerString fractionString result aString aFloat decPt between myAbs |
- self isNaN ifTrue: [^ 'NaN'].
- aString := (aFloat := self asFloat) printString.
- aFloat isInfinite ifTrue: [^ aFloat printString].
- myAbs := aFloat abs.
-
- (aString indexOf: $e ifAbsent: [nil]) ifNotNilDo:
- [:ePosition |  ((myAbs <  1.0e-15) or: [myAbs > 1.0e15]) ifTrue:
- [decPt := aString indexOf: $. ifAbsent: [^ aString].
- between := aString copyFrom: (decPt + 1) to: (ePosition - 1).
- ^ String streamContents: [:aStream |
- aStream nextPutAll: (aString copyFrom: 1 to: decPt).
- aStream nextPutAll: between.
- aStream nextPutAll: (aString copyFrom: ePosition to: aString size)]]].
-
- "The remainder of this method is courtesy of Frank Sergeant, Dec/06"
- placesDesired <= 0 ifTrue: [^ self rounded printString].
- precision _ Utilities floatPrecisionForDecimalPlaces: placesDesired.
- rounded _ self roundTo: precision.
- sign := rounded negative ifTrue: ['-'] ifFalse: [''].
- integerString := rounded abs integerPart asInteger printString.
- frac := ((rounded abs fractionPart roundTo: precision) * (10 raisedToInteger: placesDesired)) asInteger.
- fractionString := frac printString padded: #left to: placesDesired with: $0.
- result := sign , integerString , '.' , fractionString.
- ^ result
  "
  23 printShowingDecimalPlaces: 2
  23.5698 printShowingDecimalPlaces: 2
  -234.567 printShowingDecimalPlaces: 5
  23.4567 printShowingDecimalPlaces: 0
  23.5567 printShowingDecimalPlaces: 0
  -23.4567 printShowingDecimalPlaces: 0
  -23.5567 printShowingDecimalPlaces: 0
  100000000 printShowingDecimalPlaces: 1
+ 0.98 printShowingDecimalPlaces: 5
- 0.98 printShowingDecimalPlaces: 2
  -0.98 printShowingDecimalPlaces: 2
  2.567 printShowingDecimalPlaces: 2
  -2.567 printShowingDecimalPlaces: 2
  0 printShowingDecimalPlaces: 2
- Float infinity printShowingDecimalPlaces: 5
- 2345.67890123 printShowingDecimalPlaces: 5
- 23456789.0012345 printShowingDecimalPlaces: 3
  "!

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