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Re^7: Feature Idea: qr//e

by huck (Parson)
on Jan 20, 2017 at 13:11 UTC ( #1179998=note: print w/replies, xml ) Need Help??


in reply to Re^6: Feature Idea: qr//e
in thread Feature Idea: qr//e (updated with solutions)

sub m {} should be illegal

I had considered saying something like that in And i learned never to name my subroutines s but then i realized that &s($n,$k) probably would not have thrown the error.

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Re^8: Feature Idea: qr//e (barewords)
by LanX (Cardinal) on Jan 20, 2017 at 13:20 UTC
    Well it's a parsing problem, if you manage to enter a subroutine named s into the stash you can certainly call it with &s (which is not a bare word anymore)

    Can't test at the moment, and Perl's parser is known to be complicated. :)

    (I remember that CGI renamed tr to TR for this reason)

    Cheers Rolf
    (addicted to the Perl Programming Language and ☆☆☆☆ :)
    Je suis Charlie!

      > if you manage to enter a subroutine named s into the stash you can certainly call it with &s

      to illustrate what I meant, *s and &s are not "bare" because of the sigils.

      But a bare word s is supposed to start a s/// resp. s()() or s{}{} or ... depending on whatever character follows (even with empty space in between)

      This makes parsing particularly difficult.

      use strict; use warnings; *s = sub { warn "s called" }; &s(); # --- not working # sub s { # warn "s called" # } # --- neither # s();
      s called at c:/tmp/pm/s_sub.pl line 11.

      This problem should apply for all perlop#Quote-and-Quote-like-Operators .

      Cheers Rolf
      (addicted to the Perl Programming Language and ☆☆☆☆ :)
      Je suis Charlie!

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