Support the "DL" file format of UCINET

[Gábor Csárdi]

http://www.analytictech.com/networks/dataentry.htm

Seems easy, but who knows.

[Gábor Csárdi (gabor.csardi)]

The structure of the parser is ready, now I only need to fill it.

[Gábor Csárdi (gabor.csardi)]

Added in revision #1497 (0.6-main).

[Tamás Nepusz (ntamas)]

The parser is very sensitive to trailing newlines in the file; i.e., if there is at least one empty line at the end of the file, the parser fails. I don't know what the original specification says about trailing newlines, but maybe we should make the parser less stringent.

[Gábor Csárdi (gabor.csardi)]

All right, make it handle trailing newlines.

[Gábor Csárdi (gabor.csardi)]

Strange, I have added empty lines and/or empty lines with spaces to fullmatrix1.dl, edgelist4.dl and nodelist2.dl and the parser is happy with them.....

[Gábor Csárdi (gabor.csardi)]

Oh, sorry, my bad, I was running the wrong test case. :)

[Gábor Csárdi (gabor.csardi)]

Should be OK now.

[Gábor Csárdi (gabor.csardi)]

The development of igraph has moved to github, so please do not comment on this bug here. You are of course welcome to comment on github, here:
https://github.com/igraph/igraph/issues/315