[phobos] CSVRange: RFC

[David Simcha]

I've written a small module for reading CSV and similar delimited 
files.  I've been meaning to do this for a while.  Basically, it allows 
reading a CSV file with O(1) memory usage (i.e. it can be parsed one 
character at a time) to a range of ranges of cells.  Quotes, escaped 
quotes, etc. are handled properly.  I tested it on a nasty CSV file 
produced by Affymetrix, and it works rather well.

CSVRange also allows for iteration over rows as a range of structs.  For 
example, let's say you had a file:

Height,Weight,Shoe Size
6.5,210,13
...

You could read this file lazily into a range of structs with something like:

struct Person
{
     float height;
     uint weight;
     uint shoeSize;
}

auto csvRange = csvFile(someCharacterRange, ',');
auto structs = csvStructRange(csvRange, ["Height", "Weight", "Shoe Size"]);

// Iterate lazily through the rows.
foreach(s; structs) {
     // Do stuff.
}

Note that this still works even if you have tons of columns you don't 
care about in the file.

Code:

http://dsource.org/projects/scrapple/browser/trunk/csvRange/csvRange.d

Docs:

http://cis.jhu.edu/~dsimcha/csvRange.html