[Swift-devel] Join function?

[Mihael Hategan]

Just add "handle.waitFor();" before getting the length.

On Tue, 2012-04-03 at 17:04 -0500, Jonathan Monette wrote:
> That's exactly what is happening.  I am looking at it right now.  I am going to try a fix and do some tests.  I'll report back when it is fixed.
> 
> On Apr 3, 2012, at 4:59 PM, Mihael Hategan wrote:
> 
> > Maybe it didn't wait for the array to be closed?
> > 
> > On Tue, 2012-04-03 at 16:13 -0500, Michael Wilde wrote:
> >> for an array created like this:
> >> 
> >> string a[] = ["a","b","c"];
> >> 
> >> @length(a) returned 3 when called from open code, but when applied to the argument s[] inside a function, to which a was passed, returned 0 inside that function.
> >> 
> >> In trying to replicate this without divulging the source code to recursive strjoin() ;) which I was leaving as an exercise to the (email) reader, I see that there is further weirdness, likely due to confusion/race between @length() and array closing semantics.
> >> 
> >> For example:
> >> 
> >> com$ cat length.swift
> >> string a[] = ["a","b","c"];
> >> 
> >> string b[];
> >> b[0] = "a";
> >> b[1] = "b";
> >> b[2] = "c";
> >> 
> >> (string o) strjoin(string s[], string sep)
> >> {
> >> #  o = strjoinf(s, sep, @length(s));  # length returns 0 here!
> >> trace("len inside", at length(s));
> >> 
> >> }
> >> 
> >> trace("len a outside", @length(a));
> >> trace("len b outside", @length(b));
> >> 
> >> string js = strjoin(a,"---");
> >> 
> >> ####
> >> 
> >> Gives this non-determinsitic output:
> >> 
> >> com$ swift length.swift
> >> 
> >> no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml
> >> Swift trunk swift-r5739 cog-r3368 (cog modified locally)
> >> 
> >> RunID: 20120403-1559-ulurhdrf
> >> Progress:  time: Tue, 03 Apr 2012 15:59:31 -0500
> >> SwiftScript trace: len b outside, 2
> >> SwiftScript trace: len inside, 3
> >> SwiftScript trace: len a outside, 3
> >> Final status: Tue, 03 Apr 2012 15:59:31 -0500
> >> 
> >> com$ swift length.swift
> >> 
> >> no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml
> >> Swift trunk swift-r5739 cog-r3368 (cog modified locally)
> >> 
> >> RunID: 20120403-1559-x3ovo0i6
> >> Progress:  time: Tue, 03 Apr 2012 15:59:39 -0500
> >> SwiftScript trace: len b outside, 2
> >> SwiftScript trace: len a outside, 0
> >> SwiftScript trace: len inside, 0
> >> Final status: Tue, 03 Apr 2012 15:59:39 -0500
> >> 
> >> com$ swift length.swift
> >> 
> >> no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml
> >> Swift trunk swift-r5739 cog-r3368 (cog modified locally)
> >> 
> >> RunID: 20120403-1559-zkglev13
> >> Progress:  time: Tue, 03 Apr 2012 15:59:42 -0500
> >> SwiftScript trace: len b outside, 3
> >> SwiftScript trace: len a outside, 0
> >> SwiftScript trace: len inside, 0
> >> Final status: Tue, 03 Apr 2012 15:59:42 -0500
> >> 
> >> com$ swift length.swift
> >> 
> >> no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml
> >> Swift trunk swift-r5739 cog-r3368 (cog modified locally)
> >> 
> >> RunID: 20120403-1559-5ttgglqc
> >> Progress:  time: Tue, 03 Apr 2012 15:59:48 -0500
> >> SwiftScript trace: len a outside, 0
> >> SwiftScript trace: len b outside, 3
> >> SwiftScript trace: len inside, 3
> >> Final status: Tue, 03 Apr 2012 15:59:48 -0500
> >> com$ 
> >> 
> >> 
> >> ----- Original Message -----
> >>> From: "Jonathan Monette" <jonmon at mcs.anl.gov>
> >>> To: "Mihael Hategan" <hategan at mcs.anl.gov>
> >>> Cc: "Glen Hocky" <glen842 at uchicago.edu>, "swift-devel at ci.uchicago.edu Devel" <swift-devel at ci.uchicago.edu>
> >>> Sent: Tuesday, April 3, 2012 3:47:18 PM
> >>> Subject: Re: [Swift-devel] Join function?
> >>> I do not know what Mike was experiencing. I was going to investigate
> >>> myself and ask what his example was. Perhaps he can elaborate more on
> >>> what he was witnessing.
> >>> 
> >>> On Apr 3, 2012, at 3:46 PM, Mihael Hategan wrote:
> >>> 
> >>>> On Tue, 2012-04-03 at 15:43 -0500, Jonathan Monette wrote:
> >>>>> So Swift does have an @length built-in function that returns the
> >>>>> length of an array. Mike said he also tried coming up with a Swift
> >>>>> function to this same think and said that @length does not always
> >>>>> behave as he thought it should. I am going to look into fixing
> >>>>> @length so we do have a way finding the length of an array.
> >>>> 
> >>>> Can you be more specific as to what's wrong with @length?
> >>>> 
> >>> 
> >>> _______________________________________________
> >>> Swift-devel mailing list
> >>> Swift-devel at ci.uchicago.edu
> >>> https://lists.ci.uchicago.edu/cgi-bin/mailman/listinfo/swift-devel
> >> 
> > 
> > 
>