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|
package Eval::Closure;
use strict;
use warnings;
use Sub::Exporter -setup => {
exports => [qw(eval_closure)],
groups => { default => [qw(eval_closure)] },
};
# ABSTRACT: safely and cleanly create closures via string eval
use Carp;
use overload ();
use Memoize;
use Scalar::Util qw(reftype);
use Try::Tiny;
=head1 SYNOPSIS
=head1 DESCRIPTION
=cut
=func eval_closure(%args)
=cut
sub eval_closure {
my (%args) = @_;
$args{source} = _canonicalize_source($args{source});
_validate_env($args{environment} ||= {});
$args{source} = _line_directive($args{description}) . $args{source}
if defined $args{description};
my ($code, $e) = _clean_eval_closure(@args{qw(source environment)});
croak("Failed to compile source: $e\n\nsource:\n$args{source}")
unless $code;
return $code;
}
sub _canonicalize_source {
my ($source) = @_;
if (defined($source)) {
if (ref($source)) {
if (reftype($source) eq 'ARRAY'
|| overload::Method($source, '@{}')) {
return join "\n", @$source;
}
elsif (overload::Method($source, '""')) {
return "$source";
}
else {
croak("The 'source' parameter to eval_closure must be a "
. "string or array reference");
}
}
else {
return $source;
}
}
else {
croak("The 'source' parameter to eval_closure is required");
}
}
sub _validate_env {
my ($env) = @_;
croak("The 'environment' parameter must be a hashref")
unless reftype($env) eq 'HASH';
for my $var (keys %$env) {
croak("Environment key '$var' should start with \@, \%, or \$")
unless $var =~ /^([\@\%\$])/;
croak("Environment values must be references, not $env->{$var}")
unless ref($env->{$var});
}
}
sub _line_directive {
my ($description) = @_;
return qq{#line 1 "$description"\n};
}
sub _clean_eval_closure {
my ($source, $captures) = @_;
if ($ENV{EVAL_CLOSURE_PRINT_SOURCE}) {
_dump_source(_make_compiler_source(@_));
}
my @capture_keys = sort keys %$captures;
my ($compiler, $e) = _make_compiler($source, @capture_keys);
my $code;
if (defined $compiler) {
$code = $compiler->(@$captures{@capture_keys});
}
if (defined($code) && (!ref($code) || ref($code) ne 'CODE')) {
$e = "The 'source' parameter must return a subroutine reference, "
. "not $code";
undef $code;
}
return ($code, $e);
}
sub _make_compiler {
local $@;
local $SIG{__DIE__};
my $compiler = eval _make_compiler_source(@_);
my $e = $@;
return ($compiler, $e);
}
memoize('_make_compiler');
sub _make_compiler_source {
my ($source, @capture_keys) = @_;
my $i = 0;
return join "\n", (
'sub {',
(map {
'my ' . $_ . ' = ' . substr($_, 0, 1) . '{$_[' . $i++ . ']};'
} @capture_keys),
$source,
'}',
);
}
sub _dump_source {
my ($source) = @_;
my $output;
if (try { require Perl::Tidy }) {
Perl::Tidy::perltidy(
source => \$source,
destination => \$output,
);
}
else {
$output = $source;
}
warn "$output\n";
}
=head1 BUGS
No known bugs.
Please report any bugs through RT: email
C<bug-eval-closure at rt.cpan.org>, or browse to
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Eval-Closure>.
=head1 SEE ALSO
=over 4
=item * L<Class::MOP::Method::Accessor>
This module is a factoring out of code that used to live here
=back
=head1 SUPPORT
You can find this documentation for this module with the perldoc command.
perldoc Eval::Closure
You can also look for information at:
=over 4
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Eval-Closure>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Eval-Closure>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Eval-Closure>
=item * Search CPAN
L<http://search.cpan.org/dist/Eval-Closure>
=back
=head1 AUTHOR
Jesse Luehrs <doy at tozt dot net>
Based on code from L<Class::MOP::Method::Accessor>, by Stevan Little and the
Moose Cabal.
=cut
1;
|
