Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

There's surely some way of recreating the code from optree quite accurately. (See B::Deparse for a module that does something similar.)

However, I don't see the use of this. The contents of an eval BLOCK doesn't change. What's the point of printing out something you already know? What does change is the contents of variables, so there would be value in printing those.

But that's a hard problem. Consider

eval { func_that_uses_globals() }; eval { $big_complex_object->method() };

How would one programatically determine which variables would be relevant to print? What if the variable doesn't even exist in the eval block because the exception occured in code called by the eval block? I'm sure there are more issues.

Seems to me you'll just have to use the line number in the error message and either manually add code to print out the variables you deem relevant or use a debugger.

By the way, 1/0 (unlike 1/$x) throws an exception eval BLOCK can't catch, because the exception occurs at compile time during constant folding, long before eval is executed.


In reply to Re: Any way to access the contents of a block eval? by ikegami
in thread Any way to access the contents of a block eval? by adrianh

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!
  • 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, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (17)
    As of 2014-12-18 14:11 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      Is guessing a good strategy for surviving in the IT business?





      Results (54 votes), past polls