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Re^2: Bad line numbers .. bad!

by Eily (Vicar)
on Jul 25, 2013 at 21:05 UTC ( #1046424=note: print w/replies, xml ) Need Help??

in reply to Re: Bad line numbers .. bad!
in thread Bad line numbers .. bad!

I tried that, it was actually lines that ended only with a carriage return that didn't increment the value of __LINE__.

It's probably what causes phramus's problem I guess. If not, I only know of two other ways to have __LINE__ (which is replaced at compile time, so should not be affected by runtime operations) corresponding to something else than what seems obvious: source filtering and the #line directive:

package Third; use Filter::Util::Call; $\ = $/; $, = ":"; print 4, __LINE__; ## Hello BEGIN { filter_add ( sub { $status = filter_read(); $_ = "" if /^##/; +return $status; } ); } print 7, __LINE__; ## World; print 9, __LINE__; #line 42 print 11, __LINE__;

There the source filtering removes all lines starting with two #, but it has no effect on lines before the filter function is added, even though it's in a BEGIN block. So if the problem is source filtering, it has to be from a module included earlier (in the command used to run the script for example). And well, if phramus used #line 42 like comments in his script to keep track of the line number, that's tough luck.

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