import std.stdio;
import std.algorithm;
void main()
{
auto input = ["... some text, another text", "some,another","...so,an"];
auto result = input.filter!(a => a.startsWith("..."))
.map!(a=>a.splitter(",").map!(a=>a.stripLeft(' ')))
.map!(a=>a.joiner(","));
writeln(result);
}
On Wed, Aug 2, 2017 at 1:44 PM, Martin Drašar via Digitalmars-d-learn <
[email protected]> wrote:
> Hi,
>
> I am struggling to use a lazy range-based code to process large text
> files. My task is simple, i.e., I can write a non-range-based code in a
> really short time, but I wanted to try different approach and I am
> hitting a wall after wall.
>
> Task: read a csv-like input, take only lines starting with some string,
> split by a comma, remove leading and trailing whitespaces from splitted
> elements, join by comma again and write to an output.
>
> My attempt so far:
>
> alias stringStripLeft = std.string.stripLeft;
>
> auto input = File("input.csv");
> auto output = File("output.csv");
>
> auto result = input.byLine()
> .filter!(a => a.startsWith("..."))
> .map!(a => a.splitter(","))
> .stringStripleft // <-- errors start here
> .join(",");
>
> output.write(result);
>
> Needless to say, this does not compile. Basically, I don't know how to
> feed MapResults to splitter and then sensibly join it.
>
> Thank you for any hint.
> Martin
>
