June 2, 2019
10:20 p.m.
The issue is that #skipToAll: is the de facto standard name for the operation EXCEPT in Squeak and Pharo. It's not that an alias should be added. What should *really* be done is that #match: should be *renamed* to #skipToAll:. This will - improve compatibility - reduce confusion - improve navigability At the moment, for example, it is much harder to discover the consequences of renaming the #match: method than it should be because not just people but the system itself confuses #match: with #match:. The *real* API bloat in PositionableStream is that it covers both positionable input streams (which can implement #skipToAll:) and positionable output streams (which cannot), so that there are way too many methods in the interface of a WriteStream that cannot possibly work in any state of the receiver. With Trait support in Pharo, it is long past time that ReadStreams (and files opened for input only) did not respondTo: #nextPut: and that WriteStreams (and files opened for output only) did not respondTo: #next. THAT bloat dwarfs a compatibility method. On Mon, 3 Jun 2019 at 03:04, Sven Van Caekenberghe <sven@stfx.eu> wrote: > Why add an alias ? The API is too wide as it is already. > > Note that most current implementations of #upToAll: already use words like > match, so #match: is not that crazy. > > Yes it should be possible to talk about naming, but just adding aliases, > no. > > My opinion, of course. > > > On 2 Jun 2019, at 04:33, Richard O'Keefe <raoknz@gmail.com> wrote: > > > > skipToAll: aCollection > > "Set the receiver's position to just after the next occurrence of > aCollection > > in the receiver's future values and answer true. If there is no such > > occurrence, answer false. In either case, left the postion where > #upToAll: > > would have left it." > > ^self match: aCollection > > > > Sorry about the incomplete message. > > #match: is such a bad name for this operation that the method comment > has to > > go to some trouble to explain that it is nothing like #match: for > Strings. > > > > > > On Sun, 2 Jun 2019 at 14:29, Richard O'Keefe <raoknz@gmail.com> wrote: > > To get #skipToAll: in Pharo, add this to PositionableStream. > > > > skipToAll: aCollection > > "Set the receiver's to just after the next occcurrence of aCollection > > in the receiver's future values and answer true. If there is no such > > > > > > On Sun, 2 Jun 2019 at 07:50, Tim Mackinnon <tim@testit.works> wrote: > > Interesting - there is no #skipToAll: in pharo, I wonder why not? It > sounds like what I was looking for - and Iâm surprised its not there. There > is #skipTo: for an object (which sounds right, just not the string > equivalent). > > > > Iâm not doing anything special, just want to take some lines from the > end of a class comment and use them in an exercism exercise - but its not > different than many applications - find some tag and use the text after it. > Iâm kind of surprised its not in Pharo. > > > > Tim > > > > > >> On 1 Jun 2019, at 12:25, Richard O'Keefe <raoknz@gmail.com> wrote: > >> > >> If you want to move around in strings, you might want to use a > ReadStream. > >> In some Smalltalk systems there is a method called #skipToAll:. > >> Here's how mine starts out: > >> > >> skipToAll: aSequence > >> "If the remaining elements can be parsed as <a><aSequence><b>, > >> return true leaving the position where? Otherwise return > false. > >> GNU Smalltalk, Dolphin, and VisualAge: > >> leave the position after <aSequence>, consistent with > #upToAll:, > >> and implementable in this class. (GST uses the KMP algorithm.) > >> VisualWorks and ST/X: > >> leave the position before <aSequence>, inconsistent with > #upToAll:, > >> and only implementable for positionable streams. > >> Squeak 5.2 and Pharo 6.0: > >> not provided. > >> I cannot be compatible with everything. The semantics of > >> #skipToAll: should obviously match #upToAll:, so I'll fit > >> in with GNU, Dolphin, and VisualAge Smalltalk. > >> " > >> > >> So > >> (myReadStream skipToAll: 'marker') > >> ifTrue: [loc := myReadStream position] > >> ifFalse: [alternative code]. > >> > >> HOWEVER, I have a bad feeling about this. The entire approach, as with > much > >> concerning strings in a Unicode age, seems fraught with peril. Consider > >> input = 'the need for vigilance is never-ending' > >> marker = 'end' > >> Should the marker be found or not? > >> input = '.... Si<floating acute accent> ...' > >> marker = 'Si' > >> Should the marker be found or not? > >> My code is NOT sensitive to these issues. > >> I would like to say that it was because I was writing a compatibility > >> method, so my code was compatibly broken, > >> but to be honest, I was stupid and forgot to think it through. > >> I would think that there would need to be an '... asTokens: aBoolean' > >> variant that checks that a match > >> - is not followed by floating diacriticals > >> - is not preceded by an alphanumeric if the target begins with one > >> - is not followed by an alphanumeric if the target ends with one. > >> > >> My own preference is to write a lexical analyser for the mini-language > >> I'm using, and NOT try to hack at it using general-purpose string > >> methods. > >> > >> Perhaps you can tell us more about the context? What is the > application- > >> level task you are trying to solve? > >> > >> > >> > >> On Sat, 1 Jun 2019 at 22:01, Tim Mackinnon <tim@testit.works> wrote: > >> Maybe this is a dumb question - and often Iâm surprised when asking > these, but why is there no way to âfind afterâ a string. > >> > >> I find it rather boring to try and parse a string, after a known marker > - thus: > >> (loc := aString findString: âmarkerâ) > 0 ifTrue: [ loc := loc + > âmarkerâ size ]. > >> > >> Is there a better way? This whole pattern seems very old and clunky and > not smalltalk like? > >> > >> Couldnât we have: findAfter: aString ifAbsent: aBlock ? > >> > >> Or is there a whole better pattern for string searching that Iâm > missing ? > >> > >> Tim > > > > >