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Re^2: How to do perl -c inside perl? (quoting)

by tye (Cardinal)
on Aug 28, 2012 at 16:44 UTC ( #990279=note: print w/ replies, xml ) Need Help??


in reply to Re: How to do perl -c inside perl?
in thread How to do perl -c inside perl?

Now pass an arbitrary chunk of Perl code to "perl -e" in a portable manner. Capture both STDOUT and STDERR from it. Not so trivial. I suspect I could manage that in relatively few lines of Perl code, but the complexities there are enough that I doubt I would get it completely right on the first try (and many of the details involved are not things I've actually found to be correctly documented).

- tye        


Comment on Re^2: How to do perl -c inside perl? (quoting)
Re^3: How to do perl -c inside perl? (quoting)
by BrowserUk (Pope) on Aug 28, 2012 at 18:49 UTC
    Now pass an arbitrary chunk of Perl code to "perl -e" in a portable manner.

    I was only demonstrating that windows supported backticks, not championing the idea of using them and -e as a useful mechanism.

    Capture both STDOUT and STDERR from it. Not so trivial.

    Capturing stderr also is trivial:

    C:\test>perl -E"say `perl -c -Mstrict -we\"my \$l = 365.25*\" 2>&1` " syntax error at -e line 1, at EOF -e had compilation errors.

    But I would have thought feeding the code to a piped-open and checking the exit code would suffice if all that is required is a yay or nay.

    And if you need to actually capture the error messages produced, then this might do the trick:

    #! perl -slw use strict; use Win32::Socketpair qw[ winopen2_5 ]; my( $pid, $sock ) = winopen2_5( 'perl.exe', '-c' ); print $sock <<'EOP'; my $x = 365.25**3; my $y = qx[ perl -c -e"say 'boo'"; ]; my $z = sub { print $sock <<; my $x = 365.25**3; my $y = qx[ perl -c -e"say 'boo'"; ]; my $z = sub { print $sock <<; my $x = 365.25**3; my $y = qx[ perl -c -e"say 'boo'"; ]; my $z = sub { 1; }; }; }; EOP shutdown $sock, 1; print while <$sock>; close $sock; ( $pid, $sock ) = winopen2_5( 'perl.exe', q[-E"say 'hello'; warn; die; +"] ); shutdown $sock, 1; print while <$sock>; close $sock; __END__ C:\test>winopen2_5 - syntax OK Warning: something's wrong at -e line 1. Died at -e line 1. hello

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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