This comparison was part of MiscPrimitivePlugin. MiscPrimitivePlugin is a false good idea: Smalltalk fallback code = VMMaker (slang) source Unfortunately, this is an illusion because unlike the C source inclusions in ST/X we don't have dynamic slang compilation! The consequence is that source code is not managed in VMMaker specific package, but in a dialect specific/version specific package! Squeak/Pharo/Cuis/Newspeak may all have a different version of String at image side. This is making VMMaker recipe for code generation more fragile than necessary (and not easily portable to Pharo/Cuis/whatever...). It seems to me that Clement did start a rewrite of essential primitives into proper plugin... The plan was then to retract support of MiscPrimitivePlugin after a grace period (after all, these are optional primitives). Le lun. 16 sept. 2019 à 13:39, Esteban Maringolo <emaringolo@gmail.com> a écrit :
I haven't followed nor maintained the SortFunctions library, but it relied heavily on the response of that method, by means of the "spaceship operator" ( #<=>), I think that Sven later changed such operator to "threeWayCompareTo:".
I don't know whether the primitive is available now, it wasn't back then.
Regards,
Esteban A. Maringolo
On Mon, Sep 16, 2019 at 3:52 AM ducasse <stepharo@netcourrier.com> wrote:
I see
threeWayCompareTo: aString "Do a three-way comparison between the receiver and
anotherObject, returning
-1 if self < anotherObject 0 if self = anotherObject 1 if self > anotherObject This assumes a total order in accordance with the mathematical
law of trichotomy.
See also: http://en.wikipedia.org/wiki/Three-way_comparison"
^ (self compare: self with: aString collated: AsciiOrder) - 2
And I thought that we got a new primitive returning -101 directly Is it not the case?
Stef
String>>compare: string1 with: string2 collated: order
"'abc' = 'abc' asWideString >>> true" "'abc' asWideString = 'abc' >>> true" "(ByteArray with: 97 with: 0 with: 0 with: 0) asString ~= 'a000'
asWideString >>> true"
"('abc' sameAs: 'aBc' asWideString) >>> true" "('aBc' asWideString sameAs: 'abc') >>> true" "('a000' asWideString ~= (ByteArray with: 97 with: 0 with: 0
with: 0) asString) >>> true"
"((ByteArray with: 97 with: 0 with: 0 with: 0) asString sameAs:
'Abcd' asWideString) >>> false"
"('a000' asWideString sameAs: (ByteArray with: 97 with: 0 with:
0 with: 0) asString) >>> false"
(string1 isByteString and: [string2 isByteString]) ifTrue: [ ^ ByteString compare: string1 with: string2 collated:
order].
"Primitive does not fail properly right now" ^ String compare: string1 with: string2 collated: order
ByteString>>compare: string1 with: string2 collated: order "Return 1, 2 or 3, if string1 is <, =, or > string2, with the
collating order of characters given by the order array."
| len1 len2 c1 c2 | <primitive: 'primitiveCompareString' module:
'MiscPrimitivePlugin'>
<var: #string1 declareC: 'unsigned char *string1'> <var: #string2 declareC: 'unsigned char *string2'> <var: #order declareC: 'unsigned char *order'>
len1 := string1 size. len2 := string2 size. 1 to: (len1 min: len2) do: [:i | c1 := order at: (string1 basicAt: i) + 1. c2 := order at: (string2 basicAt: i) + 1. c1 = c2 ifFalse: [c1 < c2 ifTrue: [^ 1] ifFalse: [^ 3]]]. len1 = len2 ifTrue: [^ 2]. len1 < len2 ifTrue: [^ 1] ifFalse: [^ 3].