One yucky way to do this, would be to read the original source file for the N lines until where the use load is located (because I can know the line number from the call stak, but I would need the byte offest).

If you're willing to go that far could you do something like (untested):

package MyFilter;
use Filter::Simple;

FILTER {
    while (m/sub \s+ (\w+) \s+ : \s+ method/xg) {
        my ($name, $offset) = ($1, pos);
        $offset += $BYTE_OFFSET_FROM_WHERE_FILTER_WAS_INVOKED;
        warn "ondemand subroutine $name at byte offset $offset\n"
    };
};

[download]

.. or am I missing something obvious (probably - since I think source filters are evil and avoid them like the plague ;-)

In reply to Re: Filepointer of source file inside source filter by adrianh
in thread Filepointer of source file inside source filter by liz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.