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|
package Eval::Closure;
use strict;
use warnings;
use Sub::Exporter -setup => {
exports => [qw(eval_closure)],
groups => { default => [qw(eval_closure)] },
};
use Carp;
use overload ();
use Scalar::Util qw(reftype);
use Try::Tiny;
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 name)});
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, $name) = @_
my $__captures = $_[1];
local $@;
local $SIG{__DIE__};
if ($ENV{EVAL_CLOSURE_PRINT_SOURCE}) {
_dump_source(_make_source(@_), $_[2]);
}
my $code = eval _make_source(@_);
my $e = $@;
if (defined($code) && (!ref($code) || ref($code) ne 'CODE')) {
$e = "The 'source' parameter must return a subroutine reference, "
. "not $code";
undef $code;
}
return ($code, $e);
}
sub _make_source {
my ($source, $__captures) = @_;
return join "\n", (
(map {
'my ' . $_ . ' = '
. substr($_, 0, 1) . '{$__captures->{\'' . $_ . '\'}};'
} keys %$__captures),
$source,
);
}
sub _dump_source {
my ($source, $name) = @_;
my $output;
if (try { require Perl::Tidy }) {
Perl::Tidy::perltidy(
source => \$source,
destination => \$output,
);
}
else {
$output = $source;
}
$name = defined($name) ? $name : "__ANON__";
warn $name . ":\n" . $output . "\n";
}
1;
|
