the std.algorithm.splitter returns a blank or null (eg a null string "") between two consecuting delimeters.

for example, splitting "hello  world" (two spaces between words) will return ["hello" , "", "world"]

is there an improoved version of it, which wont return such a blank/null when multiple delimeters are found consecutively? (i tried to search the tango for d2, but i was not successful, should there be one like this already, it must have escaped my sight)

On Saturday, 14 December 2013 at 16:00:06 UTC, seany wrote:
> the std.algorithm.splitter returns a blank or null (eg a null string "") between two consecuting delimeters.
>
> for example, splitting "hello  world" (two spaces between words) will return ["hello" , "", "world"]
>
> is there an improoved version of it, which wont return such a blank/null when multiple delimeters are found consecutively? (i tried to search the tango for d2, but i was not successful, should there be one like this already, it must have escaped my sight)

Just filter out the empty ranges:

r.splitter().filter!(x => !x.empty)

seany:

> for example, splitting "hello  world" (two spaces between words) will return ["hello" , "", "world"]

It's a bug.

Bye,
bearophile

Am Sat, 14 Dec 2013 17:41:22 +0100
schrieb "bearophile" <bearophileHUGS@lycos.com>:

> seany:
> 
> > for example, splitting "hello  world" (two spaces between words) will return ["hello" , "", "world"]
> 
> It's a bug.
> 
> Bye,
> bearophile

Not at all, the documentation explicitly states:

  assert(equal(splitter("hello  world", ' '), [ "hello", "", "world" ]));

-- 
Marco

Marco Leise:

> Not at all, the documentation explicitly states:
>
>   assert(equal(splitter("hello  world", ' '), [ "hello", "", "world" ]));

I didn't see the ' ' in the OP code, sorry.

A test:


void main() {
    import std.stdio, std.string, std.algorithm;
    auto s = "hello  world";
    s.split().writeln;
    std.array.splitter(s).writeln;
    s.splitter(' ').writeln;
}


The output seems OK:

["hello", "world"]
["hello", "world"]
["hello", "", "world"]

Bye,
bearophile

14-Dec-2013 21:20, bearophile пишет:
> Marco Leise:
>
>> Not at all, the documentation explicitly states:
>>
>>   assert(equal(splitter("hello  world", ' '), [ "hello", "", "world" ]));
>
> I didn't see the ' ' in the OP code, sorry.
>
> A test:
>
>
> void main() {
>      import std.stdio, std.string, std.algorithm;
>      auto s = "hello  world";
>      s.split().writeln;
>      std.array.splitter(s).writeln;
>      s.splitter(' ').writeln;
> }
>
>
> The output seems OK:

Yup, there are 2 splitters - one that uses explicit separator and one that uses predicate. AFAIK the default predicate is std.uni.isWhite.

> ["hello", "world"]
> ["hello", "world"]
> ["hello", "", "world"]
>
> Bye,
> bearophile


-- 
Dmitry Olshansky

Am Sat, 14 Dec 2013 18:20:13 +0100
schrieb "bearophile" <bearophileHUGS@lycos.com>:

> Marco Leise:
> 
> > Not at all, the documentation explicitly states:
> >
> >   assert(equal(splitter("hello  world", ' '), [ "hello", "",
> > "world" ]));
> 
> I didn't see the ' ' in the OP code, sorry.
> 
> A test:
> 
> 
> void main() {
>      import std.stdio, std.string, std.algorithm;
>      auto s = "hello  world";
>      s.split().writeln;
>      std.array.splitter(s).writeln;
>      s.splitter(' ').writeln;
> }
> 
> 
> The output seems OK:
> 
> ["hello", "world"]
> ["hello", "world"]
> ["hello", "", "world"]
> 
> Bye,
> bearophile

Somehow I cannot say this makes me happy. I totally thought there was only one splitter and it has to be used with a delimiter. You are right that the OP didn't say which version he used. The result made it clear in the end. So the solution to this is "use the other splitter".

-- 
Marco

On Sunday, 15 December 2013 at 01:25:39 UTC, Marco Leise wrote:
> Am Sat, 14 Dec 2013 18:20:13 +0100
> schrieb "bearophile" <bearophileHUGS@lycos.com>:
>
>> Marco Leise:
>> 
>> > Not at all, the documentation explicitly states:
>> >
>> >   assert(equal(splitter("hello  world", ' '), [ "hello", "", "world" ]));
>> 
>> I didn't see the ' ' in the OP code, sorry.
>> 
>> A test:
>> 
>> 
>> void main() {
>>      import std.stdio, std.string, std.algorithm;
>>      auto s = "hello  world";
>>      s.split().writeln;
>>      std.array.splitter(s).writeln;
>>      s.splitter(' ').writeln;
>> }
>> 
>> 
>> The output seems OK:
>> 
>> ["hello", "world"]
>> ["hello", "world"]
>> ["hello", "", "world"]
>> 
>> Bye,
>> bearophile
>
> Somehow I cannot say this makes me happy. I totally thought
> there was only one splitter and it has to be used with a
> delimiter. You are right that the OP didn't say which version
> he used. The result made it clear in the end. So the solution
> to this is "use the other splitter".

I was using, as I said, std.algorithm.splitter, and I did not know that it could be called without a delimeter. i always called it like

std.algorithm.splitter("hello  world", ' '); //two spaces in array

And that is giving me one empty element.