Sub::Quote - efficient generation of subroutines via string eval
package Silly; use Sub::Quote qw(quote_sub unquote_sub quoted_from_sub); quote_sub 'Silly::kitty', q{ print "meow" }; quote_sub 'Silly::doggy', q{ print "woof" }; my $sound = 0; quote_sub 'Silly::dagron', q{ print ++$sound % 2 ? 'burninate' : 'roar' }, { '$sound' => \$sound };
And elsewhere:
Silly->kitty; # meow Silly->doggy; # woof Silly->dagron; # burninate Silly->dagron; # roar Silly->dagron; # burninate
This package provides performant ways to generate subroutines from strings.
my $coderef = quote_sub 'Foo::bar', q{ print $x++ . "\n" }, { '$x' => \0 };
Arguments: ?$name, $code, ?\%captures, ?\%options
$name is the subroutine where the coderef will be installed.
$name
$code is a string that will be turned into code.
$code
\%captures is a hashref of variables that will be made available to the code. See the "SYNOPSIS"'s Silly::dagron for an example using captures.
\%captures
Silly::dagron
no_install
Boolean. Set this option to not install the generated coderef into the passed subroutine name on undefer.
my $coderef = unquote_sub $sub;
Forcibly replace subroutine with actual code. Note that for performance reasons all quoted subs declared so far will be globally unquoted/parsed in a single eval. This means that if you have a syntax error in one of your quoted subs you may find out when some other sub is unquoted.
If $sub is not a quoted sub, this is a no-op.
my $data = quoted_from_sub $sub; my ($name, $code, $captures, $compiled_sub) = @$data;
Returns original arguments to quote_sub, plus the compiled version if this sub has already been unquoted.
Note that $sub can be either the original quoted version or the compiled version for convenience.
my $prelude = capture_unroll { '$x' => 1, '$y' => 2, }; my $inlined_code = inlinify q{ my ($x, $y) = @_; print $x + $y . "\n"; }, '$x, $y', $prelude;
Takes a string of code, a string of arguments, a string of code which acts as a "prelude", and a Boolean representing whether or not to localize the arguments.
my $prelude = capture_unroll { '$x' => 1, '$y' => 2, };
Generates a snippet of code which is suitable to be used as a prelude for "inlinify". The keys are the names of the variables and the values are (duh) the values. Note that references work as values.
Much of this is just string-based code-generation, and as a result, a few caveats apply.
Calling return from a quote_sub'ed sub will not likely do what you intend. Instead of returning from the code you defined in quote_sub, it will return from the overall function it is composited into.
return
quote_sub
So when you pass in:
quote_sub q{ return 1 if $condition; $morecode }
It might turn up in the intended context as follows:
sub foo { <important code a> do { return 1 if $condition; $morecode }; <important code b> }
Which will obviously return from foo, when all you meant to do was return from the code context in quote_sub and proceed with running important code b.
See Moo for support and contact informations.
See Moo for authors.
See Moo for the copyright and license.
To install Moo, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Moo
CPAN shell
perl -MCPAN -e shell install Moo
For more information on module installation, please visit the detailed CPAN module installation guide.