[Swift-devel] Join function?

[Jonathan Monette]

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
>> 
> 
>