Hi --
I strongly suspect that you aren't running into anything more subtle than
a bug in split()'s implementation -- probably an off-by-one issue, though
someone with more knowledge of the routines may correct me if I'm wrong.
The routines are defined in modules/internal/String.chpl (search on 'iter
split()') if you're interested in seeing if you can find+fix the bug
yourself. If not, and you'd be willing to file a bug report as a GitHub
issue, that would be terrific.
-Brad
On Thu, 16 Mar 2017, Takeshi Yamamoto wrote:
> Hello,
>
> While I'm learning the basics of Chapel, I have come across
> the following case where split() seems to give an unexpected result:
>
> proc test()
> {
> var a = "apple orange grape"; // OK
> // var a = "apple orange g"; // NG
>
> writeln( "a = ", a );
> writeln( "a.split() = ", a.split() );
>
> var b = a.split();
>
> for i in 1 .. b.size {
> writeln( "b[", i, "]:", b[ i ] );
> }
> }
>
> test();
>
> The above code gives
>
> a = apple orange grape
> a.split() = apple orange grape
> b[1]:apple
> b[2]:orange
> b[3]:grape
>
> which is my expected result. On the other hand,
> if I comment the line with "OK" and uncomment the line
> with "NG", then I get the following result:
>
> a = apple orange g
> a.split() = apple orange
> b[1]:apple
> b[2]:orange
>
> That is, split() neglects the last "g" in the string a.
>
> I tried other patters also, and it seems that if the last word
> in a string is only a single character, then split() neglects
> it for some reason.
>
> # Also, if the string has \n at the end (e.g., a = ""apple orange g\n"),
> # I get the expected result again.
>
> Is this an expected behavior of split(), or possibly a compiler issue...?
>
> PS. Also, I'm sorry if I'm making some big (or basic) mistake about
> the usage of strings.
>
> My best regards,
> Takeshi Yamamoto
>
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