On Wed, 15 Apr 2009 00:21:48 -0400, Andrei Alexandrescu
<seewebsiteforem...@erdani.org> wrote:
Daniel Keep wrote:
Andrei Alexandrescu wrote:
Daniel Keep wrote:
Andrei Alexandrescu wrote:
...
Right now readln preserves the separator. The newer File.byLine
eliminates it by default and offers to keep it by calling
File.byLine(KeepTerminator.yes). The allowed terminators are one
character or a string. See
http://erdani.dreamhosters.com/d/web/phobos/std_stdio.html#byLine
I consider such an API adequate but insufficient; we need to add to
it.
Andrei
Why not:
char[] line, sep;
line = File.byLine(); // discard sep
line = File.byLine(sep); // pass sep out
The separator is likely to be more useful once extracted.
And how about when sep is elaborate (e.g. regex)?
Andrei
Whatever was matched. If we have a file containing:
"A.B,C"
And we split lines using /[.,]/, then this:
char[] line, sep;
line = File.byLine(sep);
while( line != "" )
{
writefln(`line = "%s", sep = "%s"`, line, sep);
line = File.byLine(sep);
}
Would output this:
line = "A", sep = "."
line = "B", sep = ","
line = "C", sep = ""
-- Daniel
Where did you specify the separator in the call to byLine?
I think he's not read the docs. Consider this usage instead:
auto reader = file.byLine!("/[.,]/")();
// normal usage, doesn't return separators
foreach(line; reader)
{
...
}
// alternate usage, returns separators as well
while(!reader.empty)
{
char[] sep;
char[] line = reader.front(sep); // can't remember if this is what you
decided on.
...
reader.popFront(); // ditto
}
//Note that if foreach on ranges was extended to allow multiple parameters
per pass, you could do:
foreach(sep, line; reader)
{
...
}
-Steve
