On Friday, 5 May 2017 at 09:54:03 UTC, k-five wrote:
Hi all.
I have a simple command-line program utility in C++ that can
rename or remove files, based on regular expression.
After finding D that is more fun than C++ is, I want to port
the code, but I have problem with this part of it:
std::getline( iss, match, delimiter );
std::getline( iss, substitute, delimiter );
I need to read from iss ( = std::istringstream iss( argv[ 1 ] )
and separate them by delimiter.
Since the program gets the input from a user, and it can be
something like: 's/\d+[a-z]+@(?=\.)//g' or '/[A-Za-z0-9]+//'
So for: s/\d+[a-z]+@(?=\.)//g
I need:
s
\d+[a-z]+@(?=\.)
g
and for: /[A-Za-z0-9]+/
It should be:
[A-Za-z0-9]+
---
I tired ( std.string: split or format ) or ( std.regex split ).
In fact I need to read from a stream up to a delimiter.
Does someone knows a way to do this in D? Thanks
So, you need to consume input one element at a time (delimited),
dropping empty elements? Try std.algorithm.iteration splitter and
filter:
auto advance(Range)(ref Range r)
{
assert(!r.empty);
auto result = r.front;
r.popFront();
return result;
}
void main(string[] args)
{
import std.algorithm.iteration : splitter, filter;
import std.range : empty;
auto input = args[1].splitter('/').filter!"!a.empty"();
import std.stdio : writeln;
while (!input.empty)
writeln(input.advance());
}
The advance() function reads the next delimited element and pops
it from the range.
